Teresa Conejo-Orosa, Antonio Román Muñoz, Isabel Reche, Jorge J. Montes-Pérez, Sofía Rodríguez-Gómez, Enrique Moreno-Ostos
Predicting how waterbird populations may respond to climate change is a major challenge for conservation, which could be addressed by understanding the effects of large-scale climate oscillations, such as the North Atlantic Oscillation (NAO), on breeding population size. Here, we explore the relationship between the NAO position and the abundance of waterbird breeding pairs in a protected Mediterranean coastal wetland (Mouth of the Guadalhorce River, Málaga, southern Iberian Peninsula). We found a significant and negative relationship between the winter NAO index and the abundance of grebes (r=-0.72, N=15, p<0.01), rails (r=-0.74, N=15, p<0.01), diving ducks (r=-0.56, N=15, p<0.05) and dabbling ducks (r=-0.54, N=15, p<0.05). Our results suggest that this relation is mediated by the NAO indirect effects on wetland flooded surface via changes in winter precipitation and Mediterranean sea level. These results should be considered to design appropriate environmental management strategies devoted to preventing or mitigating potential deleterious effects of the NAO variability on Mediterranean wetlands ecosystems and preserving their valuable waterbird communities.
{"title":"Exploring NAO influence on waterbirds abundance through hydrological changes in a Mediterranean coastal wetland","authors":"Teresa Conejo-Orosa, Antonio Román Muñoz, Isabel Reche, Jorge J. Montes-Pérez, Sofía Rodríguez-Gómez, Enrique Moreno-Ostos","doi":"10.23818/limn.43.21","DOIUrl":"https://doi.org/10.23818/limn.43.21","url":null,"abstract":"Predicting how waterbird populations may respond to climate change is a major challenge for conservation, which could be addressed by understanding the effects of large-scale climate oscillations, such as the North Atlantic Oscillation (NAO), on breeding population size. Here, we explore the relationship between the NAO position and the abundance of waterbird breeding pairs in a protected Mediterranean coastal wetland (Mouth of the Guadalhorce River, Málaga, southern Iberian Peninsula). We found a significant and negative relationship between the winter NAO index and the abundance of grebes (r=-0.72, N=15, p<0.01), rails (r=-0.74, N=15, p<0.01), diving ducks (r=-0.56, N=15, p<0.05) and dabbling ducks (r=-0.54, N=15, p<0.05). Our results suggest that this relation is mediated by the NAO indirect effects on wetland flooded surface via changes in winter precipitation and Mediterranean sea level. These results should be considered to design appropriate environmental management strategies devoted to preventing or mitigating potential deleterious effects of the NAO variability on Mediterranean wetlands ecosystems and preserving their valuable waterbird communities.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135351103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Manuela Abelho, Nuno Ribeiro, Luís Fernandes, Daniel Soares, Pedro Isidoro
This study assessed the longitudinal and temporal trends in the biological quality of a stream using a learning by doing approach with higher education students under supervision. From 2004 to 2014, benthic macroinvertebrates were collected nine times in five sampling campaigns to calculate the scores of the biotic index IBMWP and of the multi-metric Portuguese index IPtIS. The two indices provided similar information but the scores were more constrained for IPtIS than for IBMWP. The biological quality was moderate along most of the longitudinal profile and time. Scores decreased downstream attaining a poor condition at the two lower reaches. The overall quality of the stream increased temporally from 2004 to 2013, decreasing in 2014 due to the disruption of the benthic macroinvertebrate communities by strong flash floods. In 2004, the exotic gastropod Potamopyrgus antipodarum was detected in relatively low abundances but the cumulative density in the stream increased steadily over time, conforming to an invasion curve. This learning by doing approach provided useful information on the spatial and temporal trends in the biological quality of the stream and detected invasion by an alien species. Data collected by higher education students may fill data gaps and complement information gathered by national authorities.
{"title":"Monitoring the biological quality of an urban stream using a learning by doing approach with higher education students","authors":"Manuela Abelho, Nuno Ribeiro, Luís Fernandes, Daniel Soares, Pedro Isidoro","doi":"10.23818/limn.43.20","DOIUrl":"https://doi.org/10.23818/limn.43.20","url":null,"abstract":"This study assessed the longitudinal and temporal trends in the biological quality of a stream using a learning by doing approach with higher education students under supervision. From 2004 to 2014, benthic macroinvertebrates were collected nine times in five sampling campaigns to calculate the scores of the biotic index IBMWP and of the multi-metric Portuguese index IPtIS. The two indices provided similar information but the scores were more constrained for IPtIS than for IBMWP. The biological quality was moderate along most of the longitudinal profile and time. Scores decreased downstream attaining a poor condition at the two lower reaches. The overall quality of the stream increased temporally from 2004 to 2013, decreasing in 2014 due to the disruption of the benthic macroinvertebrate communities by strong flash floods. In 2004, the exotic gastropod Potamopyrgus antipodarum was detected in relatively low abundances but the cumulative density in the stream increased steadily over time, conforming to an invasion curve. This learning by doing approach provided useful information on the spatial and temporal trends in the biological quality of the stream and detected invasion by an alien species. Data collected by higher education students may fill data gaps and complement information gathered by national authorities.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135830354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gisela Pereira, Mariabelén Riero, Rafael Lajmanovich, Raúl Maneyro
Herbicides used in agriculture and their metabolites are frequently detected in surface water bodies, where they can persist and cause adverse effects on aquatic organisms. The aim of this study was to evaluate the acute toxicity and genotoxic effects of the S-metolachlor (SM)-based herbicide Dual Gold® (DG®), on Leptodactylus luctator tadpoles (Anura: Leptodactylidae). To assess the toxicity of the herbicide, including the median lethal concentration (LC50) at 24h, the no-observed-effect concentration (NOEC), and the lowest-observed-effect concentration (LOEC), tadpoles were exposed to five nominal concentrations of DG® (5.0, 6.2, 7.8, 9.8, and 12.2 mg/L), and to dechlorinated water as a negative control (NC). The LC5024h of DG® was 7.0 mg/L, the NOEC was 5.0 mg/L and the LOEC=6.2 mg/L. L. luctator tadpoles were sensitive to the herbicide, reaching 100% mortality after 24 h of exposure to the highest concentration tested (12.2 mg/L). To evaluate the potential genotoxicity of the herbicide, the frequencies of micronuclei (MN) and other erythrocyte nuclear abnormalities (ENA) were determined in larvae exposed to three nominal concentrations of DG® (1.0, 5.0, and 6.2 mg/L) for 48 and 96 h. The frequencies of MN and ENA were compared with a positive control (40 mg/L of Cyclophosphamide) and a negative control. The frequencies of MN and ENA in the erythrocytes of tadpoles exposed to the test concentrations of DG® and Cyclophosphamide were significantly higher than in the negative control group at both 48 and 96 h (with the only exception of MN at 1.0 mg/L at 48 h). Our results confirm the genotoxic and cytotoxic effects of this widely used herbicide in agriculture, a fact that represents a potential risk to amphibians that develop in ponds associated with or immersed in agroecosystems.
{"title":"Acute toxicity and genotoxicity of the S-metolachlor-based herbicide Dual Gold® on Leptodactylus luctator (Hudson, 1892) tadpoles (Anura: Leptodactylidae).","authors":"Gisela Pereira, Mariabelén Riero, Rafael Lajmanovich, Raúl Maneyro","doi":"10.23818/limn.43.19","DOIUrl":"https://doi.org/10.23818/limn.43.19","url":null,"abstract":"Herbicides used in agriculture and their metabolites are frequently detected in surface water bodies, where they can persist and cause adverse effects on aquatic organisms. The aim of this study was to evaluate the acute toxicity and genotoxic effects of the S-metolachlor (SM)-based herbicide Dual Gold® (DG®), on Leptodactylus luctator tadpoles (Anura: Leptodactylidae). To assess the toxicity of the herbicide, including the median lethal concentration (LC50) at 24h, the no-observed-effect concentration (NOEC), and the lowest-observed-effect concentration (LOEC), tadpoles were exposed to five nominal concentrations of DG® (5.0, 6.2, 7.8, 9.8, and 12.2 mg/L), and to dechlorinated water as a negative control (NC). The LC5024h of DG® was 7.0 mg/L, the NOEC was 5.0 mg/L and the LOEC=6.2 mg/L. L. luctator tadpoles were sensitive to the herbicide, reaching 100% mortality after 24 h of exposure to the highest concentration tested (12.2 mg/L). To evaluate the potential genotoxicity of the herbicide, the frequencies of micronuclei (MN) and other erythrocyte nuclear abnormalities (ENA) were determined in larvae exposed to three nominal concentrations of DG® (1.0, 5.0, and 6.2 mg/L) for 48 and 96 h. The frequencies of MN and ENA were compared with a positive control (40 mg/L of Cyclophosphamide) and a negative control. The frequencies of MN and ENA in the erythrocytes of tadpoles exposed to the test concentrations of DG® and Cyclophosphamide were significantly higher than in the negative control group at both 48 and 96 h (with the only exception of MN at 1.0 mg/L at 48 h). Our results confirm the genotoxic and cytotoxic effects of this widely used herbicide in agriculture, a fact that represents a potential risk to amphibians that develop in ponds associated with or immersed in agroecosystems.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134960642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Murilo de Souza Ferreira, W. Dodds, Davi Gasparini Fernandes Cunha
Investigations on CO2 and CH4 emissions from aquatic systems have increased in the last decades, but most studies focus on high-latitude water bodies, with limited information available for tropical and subtropical zones. Here, we compiled CO2 and CH4 emissions by lentic, lotic, and other types of aquatic ecosystems (e.g., floodplains, estuaries, and mangroves) in different biomes in Brazil. We used a literature search of papers published in the last ~ 30 years to analyze reported emission rates, if they were from the diffusive (DF) and/or ebullitive (EB) pathways, and the most used methods. Most studies were carried out in two biomes (Amazon and Atlantic rainforest). The highest emissions were reported in lentic ecosystems (from 0.05 to 4568 mmol CO2 m-2 day-1, and from 0.19 to 348 mmol CH4 m-2 day-1). The DF pathway was more frequently analyzed, and the floating chamber was the most used measurement method. Our analyses indicated the EB pathway can be significant, especially for CH4 in shallow waters. There were many missing data for either DF or EB so we used studies that measured both and system depth to estimate the missing values and then used total emissions (DF+EB) to run predictive models. For the CO2 emissions, pH, water depth, dissolved oxygen, and water temperature were important predictors, whereas the potential drivers for the CH4 emissions were electrical conductivity and the CO2 emissions. More data are necessary to more clearly characterize the drivers of the emissions of such gases, further understand the dynamics of their emissions, as well as refine emission inventories on both regional and global scales in tropical regions.
{"title":"Carbon dioxide and methane emissions across tropical and subtropical inland water ecosystems in Brazil: meta-analysis of general patterns and potential drivers","authors":"Murilo de Souza Ferreira, W. Dodds, Davi Gasparini Fernandes Cunha","doi":"10.23818/limn.43.17","DOIUrl":"https://doi.org/10.23818/limn.43.17","url":null,"abstract":"Investigations on CO2 and CH4 emissions from aquatic systems have increased in the last decades, but most studies focus on high-latitude water bodies, with limited information available for tropical and subtropical zones. Here, we compiled CO2 and CH4 emissions by lentic, lotic, and other types of aquatic ecosystems (e.g., floodplains, estuaries, and mangroves) in different biomes in Brazil. We used a literature search of papers published in the last ~ 30 years to analyze reported emission rates, if they were from the diffusive (DF) and/or ebullitive (EB) pathways, and the most used methods. Most studies were carried out in two biomes (Amazon and Atlantic rainforest). The highest emissions were reported in lentic ecosystems (from 0.05 to 4568 mmol CO2 m-2 day-1, and from 0.19 to 348 mmol CH4 m-2 day-1). The DF pathway was more frequently analyzed, and the floating chamber was the most used measurement method. Our analyses indicated the EB pathway can be significant, especially for CH4 in shallow waters. There were many missing data for either DF or EB so we used studies that measured both and system depth to estimate the missing values and then used total emissions (DF+EB) to run predictive models. For the CO2 emissions, pH, water depth, dissolved oxygen, and water temperature were important predictors, whereas the potential drivers for the CH4 emissions were electrical conductivity and the CO2 emissions. More data are necessary to more clearly characterize the drivers of the emissions of such gases, further understand the dynamics of their emissions, as well as refine emission inventories on both regional and global scales in tropical regions.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43396380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Carlos Cano‐Barbacil, J. Radinger, García-Berthou García-Berthou
Unraveling the effects of latitudinal and elevational gradients on species distribution has been a central topic in biogeography for decades. However, few studies have evaluated the effects of the interaction between both gradients on species distributions. The main goal of this study was to evaluate the interaction of latitude and elevation in a freshwater context using a regional dataset of Iberian inland fish species. For this purpose, we compiled occurrence data for the 15 most widespread (i.e., present in multiple basins) Iberian fishes. We used generalized linear models including elevation, latitude, their quadratic terms, the interaction between the two gradients, and the basin as sources of variation. Results revealed contrasting species-specific distribution patterns with differing importance of the elevation and latitudinal gradients. Latitude was particularly important in explaining the distribution patterns of Salmo trutta, while the distribution of diadromous species and invasive Gambusia holbrooki or Lepomis gibbosus was mainly mediated by elevation. We detected significant interaction between elevation and latitude for 11 out of the 15 studied species. Consequently, Iberian fish species occupy different elevational niche positions depending on latitude. For example, Salmo trutta and Oncorhynchus mykiss occupy intermediate and even lower reaches in the northernmost areas. However, their occurrence probability decreases at lower latitudes, despite they can occur in elevated areas in these regions (e.g., Baetic Mountains). Finally, we discuss the potential effects of climate change on distribution patterns of the Iberian fish species studied.
{"title":"Interacting effects of latitudinal and elevational gradients on the distribution of Iberian inland fish","authors":"Carlos Cano‐Barbacil, J. Radinger, García-Berthou García-Berthou","doi":"10.23818/limn.43.18","DOIUrl":"https://doi.org/10.23818/limn.43.18","url":null,"abstract":"Unraveling the effects of latitudinal and elevational gradients on species distribution has been a central topic in biogeography for decades. However, few studies have evaluated the effects of the interaction between both gradients on species distributions. The main goal of this study was to evaluate the interaction of latitude and elevation in a freshwater context using a regional dataset of Iberian inland fish species. For this purpose, we compiled occurrence data for the 15 most widespread (i.e., present in multiple basins) Iberian fishes. We used generalized linear models including elevation, latitude, their quadratic terms, the interaction between the two gradients, and the basin as sources of variation. Results revealed contrasting species-specific distribution patterns with differing importance of the elevation and latitudinal gradients. Latitude was particularly important in explaining the distribution patterns of Salmo trutta, while the distribution of diadromous species and invasive Gambusia holbrooki or Lepomis gibbosus was mainly mediated by elevation. We detected significant interaction between elevation and latitude for 11 out of the 15 studied species. Consequently, Iberian fish species occupy different elevational niche positions depending on latitude. For example, Salmo trutta and Oncorhynchus mykiss occupy intermediate and even lower reaches in the northernmost areas. However, their occurrence probability decreases at lower latitudes, despite they can occur in elevated areas in these regions (e.g., Baetic Mountains). Finally, we discuss the potential effects of climate change on distribution patterns of the Iberian fish species studied.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":"8 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41299701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. Cozzer, Thiago Sendeski Lara, J. Dal Magro, D. Albeny‐Simões, Renan Souza Rezende
Aedes aegypti mosquito larvae develop in various aquatic microhabitats, including water-holding tires, cups and bottles. These environments may vary in nutritional characteristics, an important factor for the development of larvae and resulting adult mosquitoes. Compromised larval nutrition can result in developmental failure or affect the growth and reproductive capacity of adults. Understanding these nutritional necessities can help optimize the laboratory rearing of mosquitoes. We tested the effects of sixteen (0, 0.0013, 0.0033, 0.0066, 0.0133, 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, 0.1, 0.15, 0.2, 2 g/L) different food concentration treatments of Spirulina Alcon® larval diet on larval survival and life history characteristics of Ae. aegypti. The experiment was conducted under controlled conditions, with a temperature of 27 ± 2ºC, relative humidity of 70–80 % and a photoperiod of 12:12 h. A total of 623 (43.26 %) of the initial 1440 Ae. aegypti individuals died during the experiment. Survival curves differed significantly among food concentration treatments (Chi-Square Test = 1271, df = 15, p < 0.001). The concentrations of 0.025 (60/66.66 %) and 0.03 g/L (67/74.45 %) had the lowest survival rates and 0.15 g/L (76/84.45 %) the highest. The concentrations of 0.025 and 0.03 g/L had the shortest larval development times (8.80; 8.86 days) and longevity (9.95; 8.70 days), but adult sizes were smallest for 0.025 (3.00 mm) and largest for 0.03 (3.15 mm). The concentration of 0.15 g/L had the longest larval development time (9.59 days) and longevity (12.41 days), with intermediate adult size (3.09 mm). Laboratory survival rates for Ae. aegypti are generally associated with high mortality on low-quality and low-quantity of resources. Nutritional stress was found to impair larval development, as well as adult size and longevity. Analyzing responses to different feeding regimes is important for understanding the main mechanisms involved in larval development and the requirements for optimizing mosquito rearing systems.
{"title":"How much do you need to survive? Minimal nutritional levels to complete the development on Aedes aegypti (Diptera: Culicidae)","authors":"G. Cozzer, Thiago Sendeski Lara, J. Dal Magro, D. Albeny‐Simões, Renan Souza Rezende","doi":"10.23818/limn.43.16","DOIUrl":"https://doi.org/10.23818/limn.43.16","url":null,"abstract":"Aedes aegypti mosquito larvae develop in various aquatic microhabitats, including water-holding tires, cups and bottles. These environments may vary in nutritional characteristics, an important factor for the development of larvae and resulting adult mosquitoes. Compromised larval nutrition can result in developmental failure or affect the growth and reproductive capacity of adults. Understanding these nutritional necessities can help optimize the laboratory rearing of mosquitoes. We tested the effects of sixteen (0, 0.0013, 0.0033, 0.0066, 0.0133, 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, 0.1, 0.15, 0.2, 2 g/L) different food concentration treatments of Spirulina Alcon® larval diet on larval survival and life history characteristics of Ae. aegypti. The experiment was conducted under controlled conditions, with a temperature of 27 ± 2ºC, relative humidity of 70–80 % and a photoperiod of 12:12 h. A total of 623 (43.26 %) of the initial 1440 Ae. aegypti individuals died during the experiment. Survival curves differed significantly among food concentration treatments (Chi-Square Test = 1271, df = 15, p < 0.001). The concentrations of 0.025 (60/66.66 %) and 0.03 g/L (67/74.45 %) had the lowest survival rates and 0.15 g/L (76/84.45 %) the highest. The concentrations of 0.025 and 0.03 g/L had the shortest larval development times (8.80; 8.86 days) and longevity (9.95; 8.70 days), but adult sizes were smallest for 0.025 (3.00 mm) and largest for 0.03 (3.15 mm). The concentration of 0.15 g/L had the longest larval development time (9.59 days) and longevity (12.41 days), with intermediate adult size (3.09 mm). Laboratory survival rates for Ae. aegypti are generally associated with high mortality on low-quality and low-quantity of resources. Nutritional stress was found to impair larval development, as well as adult size and longevity. Analyzing responses to different feeding regimes is important for understanding the main mechanisms involved in larval development and the requirements for optimizing mosquito rearing systems.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44592377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Although anthropogenic fluoride (F−) pollution is a serious worldwide environmental problem, only a few countries have currently established national water quality criteria for the protection of freshwater biota. Since Canada is a global leader in biodiversity conservation that exhibits restrictive water quality benchmarks, I carry out a comparative analysis of water quality guidelines for fluoride in Canada and Spain. The Canadian water quality benchmark of 0.12 mg F−/l (maximum allowable concentration) prevents Canada’s fresh waters from significant adverse events of fluoride pollution, thereby protecting sensitive native aquatic invertebrates and adult-migrating Pacific salmon. By contrast, the Spanish water quality benchmark of 1.7 mg F−/l (annual mean concentration) allows not only continuous levels of fluoride pollution more than six times higher than natural fluoride concentrations in the fresh waters of mainland Spain, but also much higher discontinuous levels of fluoride pollution (> 15 mg F−/l). This unacceptable scenario is contrary to the current environmental goal of “zero pollution” in the European Union. In view of the existing toxicological data, a Spanish water quality guideline of 0.15−0.3 mg F−/l (maximum allowable concentration) seems much more reasonable. The recommended water quality guideline for fluoride would much better protect sensitive native fish and invertebrate species, and prevent significant bioaccumulation of fluoride in tolerant freshwater organisms.
{"title":"A comparative analysis of water quality guidelines for fluoride in Canada and Spain","authors":"J. A. Camargo","doi":"10.23818/limn.43.15","DOIUrl":"https://doi.org/10.23818/limn.43.15","url":null,"abstract":"Although anthropogenic fluoride (F−) pollution is a serious worldwide environmental problem, only a few countries have currently established national water quality criteria for the protection of freshwater biota. Since Canada is a global leader in biodiversity conservation that exhibits restrictive water quality benchmarks, I carry out a comparative analysis of water quality guidelines for fluoride in Canada and Spain. The Canadian water quality benchmark of 0.12 mg F−/l (maximum allowable concentration) prevents Canada’s fresh waters from significant adverse events of fluoride pollution, thereby protecting sensitive native aquatic invertebrates and adult-migrating Pacific salmon. By contrast, the Spanish water quality benchmark of 1.7 mg F−/l (annual mean concentration) allows not only continuous levels of fluoride pollution more than six times higher than natural fluoride concentrations in the fresh waters of mainland Spain, but also much higher discontinuous levels of fluoride pollution (> 15 mg F−/l). This unacceptable scenario is contrary to the current environmental goal of “zero pollution” in the European Union. In view of the existing toxicological data, a Spanish water quality guideline of 0.15−0.3 mg F−/l (maximum allowable concentration) seems much more reasonable. The recommended water quality guideline for fluoride would much better protect sensitive native fish and invertebrate species, and prevent significant bioaccumulation of fluoride in tolerant freshwater organisms.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49128159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Santiago Martinez Ricardo, Walter Darío Di Marzio, José Luis Alberdi, María Elena Sáenz
El presente estudio tuvo como objetivo investigar los efectos de los metales pesados Níquel (Ni), Zinc (Zn) y Cadmio (Cd) sobre diferentes parámetros morfométricos y pigmentos de la macrófita acuática Lemna gibba. El Ni produjo una disminución del área y de los ejes longitudinal y transversal de las frondes, a partir de 0.37 mg/L y 0.92 mg/L respectivamente. El Zn produjo una disminución en estos parámetros a partir de concentraciones de exposición de 4.6 mg/L. El Cd, por su parte, ejerció efectos sobre el eje transversal a menores concentraciones de exposición (0.13 mg/L) que aquellas que afectaron el área (0.26 mg/L) y los ejes longitudinales de las frondes (2.06 mg/L). Tanto el Zn como el Cd tuvieron un efecto de desagregación de las colonias. A partir de concentraciones de Zn de 20.1 mg/L la relación frondes/colonias disminuyó en función del aumento de las concentraciones de exposición. En el caso del Cd este efecto se observó a partir de 0.26 mg/L. Se observó una disminución del contenido de pigmentos en las frondes expuestas a los tres metales, con excepción de la clorofila b y total de carotenos para el Cd. El Ni fue el metal que más afectó el contenido de pigmentos. El área total fue el parámetro que arrojó valores más bajos de los índices de toxicidad para evaluar efectos a largo plazo (NOEC y LOEC) de los metales estudiados, representando así una buena variable de predicción de estos efectos. Las curvas de concentración-respuesta demuestran una mayor toxicidad del Ni, seguido por el Cd, con una acción menos adversa del Zn sobre L. gibba. Las características morfométricas de las frondes junto con la relación frondes/colonias de L. gibba podría ser utilizado en la detección temprana de efectos de metales sobre este grupo de macrófitas fundamentales por su función en ambientes dulceacuícolas, en particular, los sistemas acuáticos bonaerenses.
{"title":"Efectos del Níquel, Zinc y Cadmio sobre la morfología y el contenido de pigmentos de Lemna gibba L.","authors":"Santiago Martinez Ricardo, Walter Darío Di Marzio, José Luis Alberdi, María Elena Sáenz","doi":"10.23818/limn.43.14","DOIUrl":"https://doi.org/10.23818/limn.43.14","url":null,"abstract":"El presente estudio tuvo como objetivo investigar los efectos de los metales pesados Níquel (Ni), Zinc (Zn) y Cadmio (Cd) sobre diferentes parámetros morfométricos y pigmentos de la macrófita acuática Lemna gibba. El Ni produjo una disminución del área y de los ejes longitudinal y transversal de las frondes, a partir de 0.37 mg/L y 0.92 mg/L respectivamente. El Zn produjo una disminución en estos parámetros a partir de concentraciones de exposición de 4.6 mg/L. El Cd, por su parte, ejerció efectos sobre el eje transversal a menores concentraciones de exposición (0.13 mg/L) que aquellas que afectaron el área (0.26 mg/L) y los ejes longitudinales de las frondes (2.06 mg/L). Tanto el Zn como el Cd tuvieron un efecto de desagregación de las colonias. A partir de concentraciones de Zn de 20.1 mg/L la relación frondes/colonias disminuyó en función del aumento de las concentraciones de exposición. En el caso del Cd este efecto se observó a partir de 0.26 mg/L. Se observó una disminución del contenido de pigmentos en las frondes expuestas a los tres metales, con excepción de la clorofila b y total de carotenos para el Cd. El Ni fue el metal que más afectó el contenido de pigmentos. El área total fue el parámetro que arrojó valores más bajos de los índices de toxicidad para evaluar efectos a largo plazo (NOEC y LOEC) de los metales estudiados, representando así una buena variable de predicción de estos efectos. Las curvas de concentración-respuesta demuestran una mayor toxicidad del Ni, seguido por el Cd, con una acción menos adversa del Zn sobre L. gibba. Las características morfométricas de las frondes junto con la relación frondes/colonias de L. gibba podría ser utilizado en la detección temprana de efectos de metales sobre este grupo de macrófitas fundamentales por su función en ambientes dulceacuícolas, en particular, los sistemas acuáticos bonaerenses.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41966424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Three new species, Cobitis almadae sp. nov., Cobitis atlantica sp. nov., and Cobitis mellaria sp. nov. are described on the basis of morphological and genetic traits. Cobitis almadae sp. nov. is restricted to the Sizandro Drainage in Portugal and can be distinguished from other Cobitis species through a combination of morphometric and genetic traits including large and low peduncle depth, lateral ethmoid (suborbital spine) well developed with long narrow mediocaudal, laterocaudal and mediorostral processes, an elongated and narrow frontoparietal fontanel and a wide third Gambetta’s zone sprinkled with numerous black spots. Furthermore, two autapomorphies are found within its mitochondrial cytochrome b gene. Cobitis atlantica sp. nov. inhabits the northern Atlantic rivers of the Iberian Peninsula from the Minho Drainage to the Alcoa Drainage and can be differentiated from other Cobitis species through a set of morphometric and genetic traits including short and high peduncle depth,a well-developed lateral ethmoid (suborbital spine) with short and wide mediocaudal, laterocaudal and mediorostral processes, wide frontoparietal fontanel, and developed ventral pigmentation in adult individuals. In females, the Gambetta’s fourth row has 10-16 blotches reaching the ventral pigmentation in the caudal region and the third Gambetta’s zone is narrow with black spots. Cobitis mellaria sp. nov inhabits the Valle Drainage in southern Spain and is distinguished from other Cobitis species through the following morphometric and genetic traits: low peduncle depth, lamina circularis with convex outer edge, lateral ethmoid (suborbital spine) with short laterocaudal process and large mediorostral process, elongated frontoparietal fontanel, no ventral pigmentation in adults. In females, Gambetta’s fourth row has 10-15 blotches. One autapomorphy is found within the mitochondrial cytochrome b gene of Cobitis mellaria sp. nov.
{"title":"Description of three new species of the genus Cobitis L., 1758 (Actinopterygii, Cobitidae) in the Iberian Peninsula","authors":"I. Doadrio, C. Sousa‐Santos, J. Robalo, S. Perea","doi":"10.23818/limn.43.12","DOIUrl":"https://doi.org/10.23818/limn.43.12","url":null,"abstract":"Three new species, Cobitis almadae sp. nov., Cobitis atlantica sp. nov., and Cobitis mellaria sp. nov. are described on the basis of morphological and genetic traits. Cobitis almadae sp. nov. is restricted to the Sizandro Drainage in Portugal and can be distinguished from other Cobitis species through a combination of morphometric and genetic traits including large and low peduncle depth, lateral ethmoid (suborbital spine) well developed with long narrow mediocaudal, laterocaudal and mediorostral processes, an elongated and narrow frontoparietal fontanel and a wide third Gambetta’s zone sprinkled with numerous black spots. Furthermore, two autapomorphies are found within its mitochondrial cytochrome b gene. Cobitis atlantica sp. nov. inhabits the northern Atlantic rivers of the Iberian Peninsula from the Minho Drainage to the Alcoa Drainage and can be differentiated from other Cobitis species through a set of morphometric and genetic traits including short and high peduncle depth,a well-developed lateral ethmoid (suborbital spine) with short and wide mediocaudal, laterocaudal and mediorostral processes, wide frontoparietal fontanel, and developed ventral pigmentation in adult individuals. In females, the Gambetta’s fourth row has 10-16 blotches reaching the ventral pigmentation in the caudal region and the third Gambetta’s zone is narrow with black spots. Cobitis mellaria sp. nov inhabits the Valle Drainage in southern Spain and is distinguished from other Cobitis species through the following morphometric and genetic traits: low peduncle depth, lamina circularis with convex outer edge, lateral ethmoid (suborbital spine) with short laterocaudal process and large mediorostral process, elongated frontoparietal fontanel, no ventral pigmentation in adults. In females, Gambetta’s fourth row has 10-15 blotches. One autapomorphy is found within the mitochondrial cytochrome b gene of Cobitis mellaria sp. nov.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47112620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gerardo Solís-González, A. A. Cortés-Téllez, L. Chacón-García, M. García-Pérez, H. Martínez‐Flores, M. C. Bartolomé Camacho
The high population growth worldwide causes a high demand for food with an increase in the use of different agrochemicals, with pesticides and herbicides being the primary pollutants of anthropogenic origin in the environment. One of the critical aims of ecotoxicology is the evaluation of toxic effects of mixtures of chemical substances that can have additive, synergistics or antagonistics effects in different ecosystems. For this reason, the aims of this research were to: 1) estimate the individual subchronic toxicity of agrochemicals copper oxychloride [Cu2(OH)3Cl], copper sulfate (CuSO4), and glyphosate (Gly-BH) on the inhibition of population growth of the freshwater chlorophyte Scenedesmus intermedius, and 2) predict the antagonistic, synergistic, or additive behaviour of binary mixtures of Gly-BH with Cu2(OH)3Cl and CuSO4 through the Combination Index Equation (CIE). The individual toxicity order at 7 days of exposure in S. intermedius was CuSO4 (IC50 2.70 mg/l) > Gly-BH (IC50 4.03 mg/l) with no statistical differences between both agrochemicals and > Cu2(OH)3Cl (IC50 25.59 mg/l) with a major tolerance if it compared with the other chemicals. For the binary mixture of CuSO4/Gly-BH, an antagonistic effect was observed (combination index CI > 1), but with lower toxicity (IC50 7.40 mg/l) when compared with the individual responses of these compounds. However, in the mixture, Cu2(OH)3Cl/Gly-BH was more toxic with a synergistic response (IC50 0.85 mg/l) even between 5 and 30 times higher. These results highlight the importance of studying interactions of chemical substances in ecosystems to establish a better evaluation and regulation of their environmental impact.
{"title":"Prediction of the toxic impact on the freshwater microalgae Scenedesmus intermedius produced by the interaction of copper sulfate and copper oxychloride in a binary mixture with glyphosate","authors":"Gerardo Solís-González, A. A. Cortés-Téllez, L. Chacón-García, M. García-Pérez, H. Martínez‐Flores, M. C. Bartolomé Camacho","doi":"10.23818/limn.43.10","DOIUrl":"https://doi.org/10.23818/limn.43.10","url":null,"abstract":"The high population growth worldwide causes a high demand for food with an increase in the use of different agrochemicals, with pesticides and herbicides being the primary pollutants of anthropogenic origin in the environment. One of the critical aims of ecotoxicology is the evaluation of toxic effects of mixtures of chemical substances that can have additive, synergistics or antagonistics effects in different ecosystems. For this reason, the aims of this research were to: 1) estimate the individual subchronic toxicity of agrochemicals copper oxychloride [Cu2(OH)3Cl], copper sulfate (CuSO4), and glyphosate (Gly-BH) on the inhibition of population growth of the freshwater chlorophyte Scenedesmus intermedius, and 2) predict the antagonistic, synergistic, or additive behaviour of binary mixtures of Gly-BH with Cu2(OH)3Cl and CuSO4 through the Combination Index Equation (CIE). The individual toxicity order at 7 days of exposure in S. intermedius was CuSO4 (IC50 2.70 mg/l) > Gly-BH (IC50 4.03 mg/l) with no statistical differences between both agrochemicals and > Cu2(OH)3Cl (IC50 25.59 mg/l) with a major tolerance if it compared with the other chemicals. For the binary mixture of CuSO4/Gly-BH, an antagonistic effect was observed (combination index CI > 1), but with lower toxicity (IC50 7.40 mg/l) when compared with the individual responses of these compounds. However, in the mixture, Cu2(OH)3Cl/Gly-BH was more toxic with a synergistic response (IC50 0.85 mg/l) even between 5 and 30 times higher. These results highlight the importance of studying interactions of chemical substances in ecosystems to establish a better evaluation and regulation of their environmental impact.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46893383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：