Carbon from aquatic plants and periphyton in littoral zones subsidize food webs. Field work was carried out in two different lake types in the Colombian Amazon: a várzea (Yahuarcaca) and an igapó (Pacatúa). Plants in the littoral zone of várzea Lake had higher photosynthetic biomass compared to the plants of the littoral zone of igapó, but differences in root biomass were not significant. The two littoral zones contained a relatively high species richness and diversity (Shannon-Wiener Index) of organisms associated with the roots, although no significant differences existed between the two lakes. Littoral areas may be important in relatively isolated and physically fragmented large terrestrial landscapes such as the Amazon basin.
{"title":"Littoral areas of Amazonian floodplain lakes: a biological reserve to biodiversity loss","authors":"Jhon C. Donato-R., Santiago R. Duque","doi":"10.23818/limn.42.07","DOIUrl":"https://doi.org/10.23818/limn.42.07","url":null,"abstract":"Carbon from aquatic plants and periphyton in littoral zones subsidize food webs. Field work was carried out in two different lake types in the Colombian Amazon: a várzea (Yahuarcaca) and an igapó (Pacatúa). Plants in the littoral zone of várzea Lake had higher photosynthetic biomass compared to the plants of the littoral zone of igapó, but differences in root biomass were not significant. The two littoral zones contained a relatively high species richness and diversity (Shannon-Wiener Index) of organisms associated with the roots, although no significant differences existed between the two lakes. Littoral areas may be important in relatively isolated and physically fragmented large terrestrial landscapes such as the Amazon basin.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68867547","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}
C. Gutiérrez‐Cánovas, Rebeca Arias-Real, D. Bruno, Marco J. Cabrerizo, J. M. González-Olalla, Félix Picazo, F. Romero, D. Sánchez‐Fernández, Susana Pallarés
Multiple-stressors effects on Iberian freshwaters: A review of current knowledge and future research priorities Freshwater ecosystems are exposed to an increasing number of stressors, challenging their biomonitoring and management. Despite recent advances in multiple-stressor research, regional-scale assessments in areas with high freshwater biodiversity and increasing anthropogenic pressure are urgently needed. We reviewed 61 studies focused on freshwater individuals, populations and communities from the Iberian Peninsula to (i) quantify the frequency of experimental approaches used (manipulative, observational), aquatic systems, biological organization levels, and types of organisms and modelled responses, (ii) identify key individual stressors and the frequency of significant positive (increase in response magnitude) and negative (decrease) effects and (iii) determine types of interacting stressors and the frequency of their combined effects. Our dataset comprised 409 unique responses to 13 types of individual stressors, 34 stressor pairs and 12 high-order interactions (3and 4-way). We found a higher prevalence of manipulative (85 %) respect to observational studies, and a greater focus on lotic systems (59 %) and heterotrophic organisms (58 %). The most studied stressors were nutrient (Nutr), thermal (Therm), hydrologic (Hydr), ultraviolet radiation (UVR), toxic (Toxic) and salinity (Sal) stress and land-use pressure. Individual stressors showed a higher proportion of negative (34 %) than positive effects (26 %). Nutr × UVR, Toxic × Toxic, Therm × Toxic, Hydr × Toxic, Sal × Therm, and Nutr × Therm were the most studied stressor pairs. Non-interactive (50 %) and interactive responses (50 %) were balanced. Antagonistic effects (18 %) were slightly more common than synergisms (15 %), reversal or opposing Limnetica, 41(2): 000-000 (2022). DOI: 10.23818/limn.41.15 Gutiérrez-Cánovas et al.
{"title":"Multiple-stressors effects on Iberian freshwaters: A review of current knowledge and future research priorities","authors":"C. Gutiérrez‐Cánovas, Rebeca Arias-Real, D. Bruno, Marco J. Cabrerizo, J. M. González-Olalla, Félix Picazo, F. Romero, D. Sánchez‐Fernández, Susana Pallarés","doi":"10.23818/limn.41.15","DOIUrl":"https://doi.org/10.23818/limn.41.15","url":null,"abstract":"Multiple-stressors effects on Iberian freshwaters: A review of current knowledge and future research priorities Freshwater ecosystems are exposed to an increasing number of stressors, challenging their biomonitoring and management. Despite recent advances in multiple-stressor research, regional-scale assessments in areas with high freshwater biodiversity and increasing anthropogenic pressure are urgently needed. We reviewed 61 studies focused on freshwater individuals, populations and communities from the Iberian Peninsula to (i) quantify the frequency of experimental approaches used (manipulative, observational), aquatic systems, biological organization levels, and types of organisms and modelled responses, (ii) identify key individual stressors and the frequency of significant positive (increase in response magnitude) and negative (decrease) effects and (iii) determine types of interacting stressors and the frequency of their combined effects. Our dataset comprised 409 unique responses to 13 types of individual stressors, 34 stressor pairs and 12 high-order interactions (3and 4-way). We found a higher prevalence of manipulative (85 %) respect to observational studies, and a greater focus on lotic systems (59 %) and heterotrophic organisms (58 %). The most studied stressors were nutrient (Nutr), thermal (Therm), hydrologic (Hydr), ultraviolet radiation (UVR), toxic (Toxic) and salinity (Sal) stress and land-use pressure. Individual stressors showed a higher proportion of negative (34 %) than positive effects (26 %). Nutr × UVR, Toxic × Toxic, Therm × Toxic, Hydr × Toxic, Sal × Therm, and Nutr × Therm were the most studied stressor pairs. Non-interactive (50 %) and interactive responses (50 %) were balanced. Antagonistic effects (18 %) were slightly more common than synergisms (15 %), reversal or opposing Limnetica, 41(2): 000-000 (2022). DOI: 10.23818/limn.41.15 Gutiérrez-Cánovas et al.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68867092","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}
Zhan Yeley, J. Delegido, M. Erena, J. Soria, A. Ruiz-Verdú, Patricia Urrego, X. Sòria-Perpinyà, E. Vicente, J. Moreno
Mar Menor is a Mediterranean Coastal lagoon with high environmental and social value, but has suffered important episodes of contamination in recent years due to heavy rains, sediment dragging and polluting substances mainly from agriculture as well as the entry of mining waste, causing an increase in eutrophication. Water quality variables such as chlorophyll-a concentration [Chl-a] and turbidity, can be studied through its optical properties by remote sensing techniques. In this work, a methodology is proposed for monitoring [Chl-a] and the turbidity of the Mar Menor using Sentinel-2 images. For this purpose, an extensive database of both variables was used consisting of data taken on different dates between 2016 and 2019 at 12 points of Mar Menor. The images were atmospherically corrected using Case 2 Regional Coast Color Processor (C2RCC) version for turbid waters (C2X) to obtain the water surface reflectance. Then several arithmetic relations between database and reflectance bands used in the bibliography for [Chl-a] and turbidity were analyzed. Comparing the results of each one of these relations with the in situ data, decided that the best index for [Chl-a] estimation is the relation (R560 + R705)/ (R560 + R665) with an RMSE = 2.6 mg/m3 and a NRMSE = 9.1 % and for turbidity R705*R705/R490 with an RMSE = 1.5 NTU and a NRMSE= 10.9 %. Finally, by applying these relationships on different dates, thematic maps of [Chl-a] and turbidity of Mar Menor were obtained. One of these images was some days after September 2019 torrential rains, in which a considerable [Chl-a] and turbidity increase was observed
Mar Menor是地中海沿岸的一个泻湖，具有很高的环境和社会价值，但近年来由于暴雨、沉积物拖曳和主要来自农业的污染物质以及采矿废物的进入，造成了富营养化的增加，因此遭受了严重的污染事件。水质变量，如叶绿素a浓度和浊度，可以通过遥感技术通过其光学性质来研究。在这项工作中，提出了一种使用Sentinel-2图像监测[Chl-a]和Mar Menor浊度的方法。为此，研究人员使用了一个包含这两个变量的广泛数据库，该数据库由2016年至2019年期间在Mar Menor 12个点的不同日期采集的数据组成。使用Case 2区域海岸彩色处理器(C2RCC)版本对浑浊水域(C2X)进行大气校正，获得水面反射率。在此基础上，分析了[Chl-a]参考文献中数据库与反射率带与浊度之间的几种算法关系。将各关系的结果与现场数据进行比较，确定[Chl-a]估算的最佳指标为(R560 + R705)/ (R560 + R665)关系，RMSE= 2.6 mg/m3, NRMSE= 9.1%;浊度R705*R705/R490的RMSE= 1.5 NTU, NRMSE= 10.9%。最后，通过将这些关系应用于不同的日期，获得了[Chl-a]和Mar Menor浊度的专题图。其中一张图像是在2019年9月暴雨后的几天拍摄的，其中观察到相当大的[Chl-a]和浊度增加
{"title":"Mar Menor lagoon (SE Spain) chlorophyll-a and turbidity estimation with Sentinel-2","authors":"Zhan Yeley, J. Delegido, M. Erena, J. Soria, A. Ruiz-Verdú, Patricia Urrego, X. Sòria-Perpinyà, E. Vicente, J. Moreno","doi":"10.23818/limn.41.18","DOIUrl":"https://doi.org/10.23818/limn.41.18","url":null,"abstract":"Mar Menor is a Mediterranean Coastal lagoon with high environmental and social value, but has suffered important episodes of contamination in recent years due to heavy rains, sediment dragging and polluting substances mainly from agriculture as well as the entry of mining waste, causing an increase in eutrophication. Water quality variables such as chlorophyll-a concentration [Chl-a] and turbidity, can be studied through its optical properties by remote sensing techniques. In this work, a methodology is proposed for monitoring [Chl-a] and the turbidity of the Mar Menor using Sentinel-2 images. For this purpose, an extensive database of both variables was used consisting of data taken on different dates between 2016 and 2019 at 12 points of Mar Menor. The images were atmospherically corrected using Case 2 Regional Coast Color Processor (C2RCC) version for turbid waters (C2X) to obtain the water surface reflectance. Then several arithmetic relations between database and reflectance bands used in the bibliography for [Chl-a] and turbidity were analyzed. Comparing the results of each one of these relations with the in situ data, decided that the best index for [Chl-a] estimation is the relation (R560 + R705)/ (R560 + R665) with an RMSE = 2.6 mg/m3 and a NRMSE = 9.1 % and for turbidity R705*R705/R490 with an RMSE = 1.5 NTU and a NRMSE= 10.9 %. Finally, by applying these relationships on different dates, thematic maps of [Chl-a] and turbidity of Mar Menor were obtained. One of these images was some days after September 2019 torrential rains, in which a considerable [Chl-a] and turbidity increase was observed","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68867696","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}
Alejandro López-de Sancha, Romero Roig, Martí Aranyó, A. Vila-Gispert, H. Guasch
Salmo trutta is a key species of headwater streams that is able to influence the structure of these ecosystems through predation. Populations of this species are being threatened by climate change and hydrological alteration. In order to understand how their disappearance would affect the ecosystem structure of headwater streams, we used cage experiments to analyse different biofilm and macroinvertebrate structural parameters and the biodiversity of their communities under different trout densities. Due to a heavy rain event, our experiment was destroyed on the 10th day, but the role of trout as stream ecosystemic structure drivers was observed, as multiple parameters were modulated by their presence or absence. In the high-density treatments, a significant reduction in the biomass of macroinvertebrate families that fed on biofilms was observed due to direct predation on them, which caused the biofilms to be more autotrophic. A decrease in brown trout population densities could cause cascading trophic effects on the ecosystem structure of headwater streams.
{"title":"Brown trout density effects on the macroinvertebrate and biofilm communities of headwater streams: a cage experiment","authors":"Alejandro López-de Sancha, Romero Roig, Martí Aranyó, A. Vila-Gispert, H. Guasch","doi":"10.23818/limn.42.02","DOIUrl":"https://doi.org/10.23818/limn.42.02","url":null,"abstract":"Salmo trutta is a key species of headwater streams that is able to influence the structure of these ecosystems through predation. Populations of this species are being threatened by climate change and hydrological alteration. In order to understand how their disappearance would affect the ecosystem structure of headwater streams, we used cage experiments to analyse different biofilm and macroinvertebrate structural parameters and the biodiversity of their communities under different trout densities. Due to a heavy rain event, our experiment was destroyed on the 10th day, but the role of trout as stream ecosystemic structure drivers was observed, as multiple parameters were modulated by their presence or absence. In the high-density treatments, a significant reduction in the biomass of macroinvertebrate families that fed on biofilms was observed due to direct predation on them, which caused the biofilms to be more autotrophic. A decrease in brown trout population densities could cause cascading trophic effects on the ecosystem structure of headwater streams.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68867412","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}
We analysed summer assemblages and the metacommunity structure of benthic microalgae and Cyanobacteria (BMC) living in pristine ecosystems in the Serranía de Cuenca (Central Spain), whose flora is not well-known. Our analyses were focused on both overall samples and some site subgroups (two large catchments, lotic vs lentic environments, plant vs mineral substrates). 379 taxa were recorded, with Diatoms, Chlorophytes and Cyanobacteria being the richest groups. The flora composition de-pended on conductivity and the percentage of forests in each sub-basin; even so, the composition was spatially homogeneous, reflecting the relatively low variability of the landscape. Taxonomic richness did not differ between inventory subgroups, but it was vulnerable to the somewhat higher values of low concentrations of nitrogen and phosphorus compounds. Two groups of BMC assemblages emerged in the territory: one of cosmopolitan Diatoms and Cyanobacteria, and another of Cyanobacteria, Diatoms and Chlorophytes associated with travertine. The structure of the metacommunity was governed by the contributions of space, catchment features and the local environment (chemical and biological); the relevance of biological factors, which are not usually analysed, was highlighted. Finally, we suggest the joint study of local ecology and metacommunity that is feasible with the many occurrence databases of many benthic organisms. Soon artificial intelligence and new taxonomic tools will allow faster and more comprehensive processing of the huge number of freshwater datasets already in existence, which will be a huge leap in ecological knowledge of benthic assemblages in the coming years.
我们分析了生活在西班牙中部Serranía de Cuenca原始生态系统中的底栖微藻和蓝藻(BMC)的夏季组合和元群落结构。我们的分析集中在整体样本和一些站点亚群上(两个大的集水区，水环境与水环境，植物与矿物基质)。其中硅藻、绿藻和蓝藻是最丰富的类群。植物区系组成取决于每个子流域的电导率和森林的百分比;尽管如此，其构成在空间上是均匀的，反映了景观相对较低的可变性。分类丰富度在不同亚群间无显著差异，但易受低浓度氮磷化合物较高值的影响。在该地区出现了两组BMC组合:一组是世界性的硅藻和蓝藻，另一组是与石灰华相关的蓝藻、硅藻和绿藻。元群落的结构受空间、流域特征和当地环境(化学和生物)的影响;强调了通常不加以分析的生物因素的相关性。最后，我们建议结合多种底栖生物的多种发生数据库，进行局部生态与元群落的联合研究。很快，人工智能和新的分类工具将允许对现有的大量淡水数据集进行更快、更全面的处理，这将是未来几年底栖生物群落生态知识的巨大飞跃。
{"title":"Bridging community and metacommunity perspectives in benthic photosynthetic organisms (Serranía de Cuenca, Central Spain)","authors":"M. Álvarez Cobelas, C. Rojo","doi":"10.23818/limn.42.04","DOIUrl":"https://doi.org/10.23818/limn.42.04","url":null,"abstract":"We analysed summer assemblages and the metacommunity structure of benthic microalgae and Cyanobacteria (BMC) living in pristine ecosystems in the Serranía de Cuenca (Central Spain), whose flora is not well-known. Our analyses were focused on both overall samples and some site subgroups (two large catchments, lotic vs lentic environments, plant vs mineral substrates). 379 taxa were recorded, with Diatoms, Chlorophytes and Cyanobacteria being the richest groups. The flora composition de-pended on conductivity and the percentage of forests in each sub-basin; even so, the composition was spatially homogeneous, reflecting the relatively low variability of the landscape. Taxonomic richness did not differ between inventory subgroups, but it was vulnerable to the somewhat higher values of low concentrations of nitrogen and phosphorus compounds. Two groups of BMC assemblages emerged in the territory: one of cosmopolitan Diatoms and Cyanobacteria, and another of Cyanobacteria, Diatoms and Chlorophytes associated with travertine. The structure of the metacommunity was governed by the contributions of space, catchment features and the local environment (chemical and biological); the relevance of biological factors, which are not usually analysed, was highlighted. Finally, we suggest the joint study of local ecology and metacommunity that is feasible with the many occurrence databases of many benthic organisms. Soon artificial intelligence and new taxonomic tools will allow faster and more comprehensive processing of the huge number of freshwater datasets already in existence, which will be a huge leap in ecological knowledge of benthic assemblages in the coming years.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68867500","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}
Isabel Cristina Gil-Guarín, S. Villabona-González, M. I. Ríos-Pulgarín
Los rasgos funcionales morfológicos, fisiológicos y ecológicos de las comunidades planctónicas en sistemas naturales han mostrado sensibilidad frente a la variabilidad hidrológica, no obstante, hay poca información respecto a la dinámica funcional del fitoplancton en embalses tropicales con alto tiempo de residencia. En este trabajo se estudió la composición y biomasa de los grupos funcionales del fitoplancton propuestos por Reynolds et al. (2002), sus cambios durante periodos hidrológicos contrastantes y a lo largo del gradiente espacial (longitudinal y vertical) y su relación con variables físicas y químicas en el embalse El Peñol-Guatapé. Se registraron siete grupos funcionales, de acuerdo con su preferencia en términos de luz, estado trófico y condiciones de mezcla: GF-F (Botryococcus braunni, Oocystis cf. lacustris), GF-Lm (Ceratium furcoides y Microcystis wesenbergii), GF-Lo (Chroococcus minutus, Peridinium gatunense y un organismo de Peridiniales), GF-P (Staurastrum rotula), GF-S1 (Oscillatoria limosa), GF-Y (Cryptomonas sp. y Parvodinium sp.) y GF-Sin (que incluyó a Cyclotella sp.). A nivel temporal, los grupos respondieron a factores asociados con la hidrodinámica, el clima y las sustancias suspendidas y disueltas. En la escala espacial-longitudinal las condiciones impuestas por el afluente principal, especialmente el gradiente de luz, fueron determinantes en la distribución de los grupos. En cuanto a la dimensión vertical, los procesos de mezcla favorecieron la permanencia de los organismos en la zona fótica, de acuerdo con sus rasgos morfológicos y fueron determinantes de su distribución.
{"title":"Dinámica temporal y espacial de los grupos funcionales del fitoplancton en un embalse tropical colombiano","authors":"Isabel Cristina Gil-Guarín, S. Villabona-González, M. I. Ríos-Pulgarín","doi":"10.23818/limn.41.20","DOIUrl":"https://doi.org/10.23818/limn.41.20","url":null,"abstract":"Los rasgos funcionales morfológicos, fisiológicos y ecológicos de las comunidades planctónicas en sistemas naturales han mostrado sensibilidad frente a la variabilidad hidrológica, no obstante, hay poca información respecto a la dinámica funcional del fitoplancton en embalses tropicales con alto tiempo de residencia. En este trabajo se estudió la composición y biomasa de los grupos funcionales del fitoplancton propuestos por Reynolds et al. (2002), sus cambios durante periodos hidrológicos contrastantes y a lo largo del gradiente espacial (longitudinal y vertical) y su relación con variables físicas y químicas en el embalse El Peñol-Guatapé. Se registraron siete grupos funcionales, de acuerdo con su preferencia en términos de luz, estado trófico y condiciones de mezcla: GF-F (Botryococcus braunni, Oocystis cf. lacustris), GF-Lm (Ceratium furcoides y Microcystis wesenbergii), GF-Lo (Chroococcus minutus, Peridinium gatunense y un organismo de Peridiniales), GF-P (Staurastrum rotula), GF-S1 (Oscillatoria limosa), GF-Y (Cryptomonas sp. y Parvodinium sp.) y GF-Sin (que incluyó a Cyclotella sp.). A nivel temporal, los grupos respondieron a factores asociados con la hidrodinámica, el clima y las sustancias suspendidas y disueltas. En la escala espacial-longitudinal las condiciones impuestas por el afluente principal, especialmente el gradiente de luz, fueron determinantes en la distribución de los grupos. En cuanto a la dimensión vertical, los procesos de mezcla favorecieron la permanencia de los organismos en la zona fótica, de acuerdo con sus rasgos morfológicos y fueron determinantes de su distribución.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68867276","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}
The Tinto River is a small urban watercourse in the Douro River basin (Portugal) that has been subject to various types of environmental disturbances over the years, which has led to severe degradation of its ecological status. Between 2013 and 2017, several studies were carried out to characterize and monitor some environmental parameters and to identify sources of environmental disturbances. From these studies, a set of actions and projects were undertaken in 2017–2019 to mitigate some of the environmental problems and to rehabilitate the river and its riverside areas. Here, we compare some parameters related to the river’s ecological state (naturalness of the channel and banks, physicochemical conditions and benthic macroinvertebrate community) before the interventions and one year after the interventions at Tinto River. Conductivity, oxygen concentration and biotic indices improved after one year, especially during the adverse hydrological conditions brought on by a very dry summer and autumn with some flood episodes.
{"title":"Effects on macroinvertebrate communities a year after the rehabilitation of an urban river (Tinto River, Portugal)","authors":"T. Jesus, Fernando Pessoa","doi":"10.23818/limn.41.22","DOIUrl":"https://doi.org/10.23818/limn.41.22","url":null,"abstract":"The Tinto River is a small urban watercourse in the Douro River basin (Portugal) that has been subject to various types of environmental disturbances over the years, which has led to severe degradation of its ecological status. Between 2013 and 2017, several studies were carried out to characterize and monitor some environmental parameters and to identify sources of environmental disturbances. From these studies, a set of actions and projects were undertaken in 2017–2019 to mitigate some of the environmental problems and to rehabilitate the river and its riverside areas. Here, we compare some parameters related to the river’s ecological state (naturalness of the channel and banks, physicochemical conditions and benthic macroinvertebrate community) before the interventions and one year after the interventions at Tinto River. Conductivity, oxygen concentration and biotic indices improved after one year, especially during the adverse hydrological conditions brought on by a very dry summer and autumn with some flood episodes.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68867385","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}
T. Cancellario, R. Miranda, E. Baquero, C. Grosser
We reported the first record of the rare species Trocheta subviridis Dutrochet, 1817 (Arhynchobdellida, Erpobdellidae) from north-eastern Spain (Suspiro stream at Señorio de Bértiz Natural Park, Navarra, Spain). The species was previously recorded in Spain by Cordero del Campillo (1980) and García Más and Jiménez (1981). However, the latter authors admitted (Garcia Más & Jiménez, 1984) that both citations could be considered erroneous due to a misinterpretation by Cordero del Campillo of Blanchard (1893) (Jueg, 2008). Thus, considering the limited and uncertain information about T. subviridis in Spain, we can argue that our specimen is the first valid record reported for the species in the Iberian Peninsula.
本文报道了西班牙东北部(Señorio de bsamritiz Natural Park, Spain)首次记录的稀有物种Trocheta subviridis Dutrochet, 1817 (Arhynchobdellida, Erpobdellidae)。Cordero del Campillo(1980年)和García Más和jimsamnez(1981年)曾在西班牙记录过该物种。然而，后者的作者承认(Garcia Más & jimsamnez, 1984)，由于Cordero del Campillo of Blanchard (1893) (Jueg, 2008)的误解，这两种引用都可能被认为是错误的。因此，考虑到西班牙的有限和不确定的信息，我们可以认为我们的标本是伊比利亚半岛报道的该物种的第一个有效记录。
{"title":"First record of Trocheta subviridis Dutrochet, 1817 (Arhynchobdellida, Erpobdellidae) from the north-eastern Iberian Peninsula (Navarra, Spain)","authors":"T. Cancellario, R. Miranda, E. Baquero, C. Grosser","doi":"10.23818/limn.42.01","DOIUrl":"https://doi.org/10.23818/limn.42.01","url":null,"abstract":"We reported the first record of the rare species Trocheta subviridis Dutrochet, 1817 (Arhynchobdellida, Erpobdellidae) from north-eastern Spain (Suspiro stream at Señorio de Bértiz Natural Park, Navarra, Spain). The species was previously recorded in Spain by Cordero del Campillo (1980) and García Más and Jiménez (1981). However, the latter authors admitted (Garcia Más & Jiménez, 1984) that both citations could be considered erroneous due to a misinterpretation by Cordero del Campillo of Blanchard (1893) (Jueg, 2008). Thus, considering the limited and uncertain information about T. subviridis in Spain, we can argue that our specimen is the first valid record reported for the species in the Iberian Peninsula.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47958233","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}
Daniela Cortés Guzmán, J. Alcocer, José Daniel Cuevas Lara, Ismael Soria Reinoso, L. Oseguera, M. Merino-Ibarra
Organic matter seasonality and ecosystem metabolism in two tropical first-order streams Dissolved and particulate organic matter are the energy source for secondary production in forested streams. Cycling of organic matter and stream ecosystem functioning are linked to organic matter input and storage capacity and timing. This study assessed the seasonal variation (dry and rainy seasons) of environmental parameters, organic matter stock and input, and stream metabolism in two first-order tropical streams in the Selva Lacandona, Mexico. We also aimed to identify the drivers of organic matter and stream metabolism seasonality. We found seasonal variation in organic matter stock and input correlated with tropical seasonality. Dissolved organic matter and seston increased in the rainy season, while benthic primary producers and leaf litter stock and input increased in the dry season correlated with lower water discharge. Gross primary production increased in the dry season, while ecosystem respiration did not differ between seasons. Seasonality defined by the rainfall pattern and its effect on stream hydrology is the main driver of organic matter dynamics in tropical streams. However, environmental parameters and organic matter stock and input were not good predictors of stream metabolism.
{"title":"Organic matter seasonality and ecosystem metabolism in two tropical first-order streams","authors":"Daniela Cortés Guzmán, J. Alcocer, José Daniel Cuevas Lara, Ismael Soria Reinoso, L. Oseguera, M. Merino-Ibarra","doi":"10.23818/limn.41.19","DOIUrl":"https://doi.org/10.23818/limn.41.19","url":null,"abstract":"Organic matter seasonality and ecosystem metabolism in two tropical first-order streams Dissolved and particulate organic matter are the energy source for secondary production in forested streams. Cycling of organic matter and stream ecosystem functioning are linked to organic matter input and storage capacity and timing. This study assessed the seasonal variation (dry and rainy seasons) of environmental parameters, organic matter stock and input, and stream metabolism in two first-order tropical streams in the Selva Lacandona, Mexico. We also aimed to identify the drivers of organic matter and stream metabolism seasonality. We found seasonal variation in organic matter stock and input correlated with tropical seasonality. Dissolved organic matter and seston increased in the rainy season, while benthic primary producers and leaf litter stock and input increased in the dry season correlated with lower water discharge. Gross primary production increased in the dry season, while ecosystem respiration did not differ between seasons. Seasonality defined by the rainfall pattern and its effect on stream hydrology is the main driver of organic matter dynamics in tropical streams. However, environmental parameters and organic matter stock and input were not good predictors of stream metabolism.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68867252","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}
The ecological impacts of recreational uses on the rivers of Sierra de Guadarrama National Park (SGNP) have been scarcely studied. To assess the impacts of these uses at Las Presillas (an area with small dam along a section of the Lozoya River), and in the Lozoya River (upstream and downstream of the dams), the dynamics of the organic seston (FPOM), physicochemical variables (electric conductivity, dissolved oxygen, Temperature, and pH) and biological variables (fecal coliforms, fecal streptococci, and aquatic macroinvertebrates) during the recreational (July to September) and nonrecreational (October) periods were assessed. The variations observed in the physicochemical parameters were associated with autumnal influence. However, at Las Presillas, different values were found than at the rest of the surveyed sites, characterized by an increase in the concentration of FPOM and, human fecal contamination (although they did not reach dangerous levels) and the response of the macroinvertebrate communities, which resulted in a clear decrease in the IBMWP index and other quality metrics, during the recreational period. These findings suggest that the combined effects of the dams and recreational activities at Las Presillas generate functional dynamics in that alter the habitat in summer. The identification and study of these impacts through the application of innovative indices and quality classes that integrate and contextualize Las Presillas in the SGNP monitoring network, have been identified as key management and conservation tools.
{"title":"Ecological impact of recreational bathing at Las Presillas (Lozoya River, Sierra de Guadarrama National Park, central Spain)","authors":"Christian Arnanz, A. López-Archilla, P. Alcorlo","doi":"10.23818/limn.41.23","DOIUrl":"https://doi.org/10.23818/limn.41.23","url":null,"abstract":"The ecological impacts of recreational uses on the rivers of Sierra de Guadarrama National Park (SGNP) have been scarcely studied. To assess the impacts of these uses at Las Presillas (an area with small dam along a section of the Lozoya River), and in the Lozoya River (upstream and downstream of the dams), the dynamics of the organic seston (FPOM), physicochemical variables (electric conductivity, dissolved oxygen, Temperature, and pH) and biological variables (fecal coliforms, fecal streptococci, and aquatic macroinvertebrates) during the recreational (July to September) and nonrecreational (October) periods were assessed. The variations observed in the physicochemical parameters were associated with autumnal influence. However, at Las Presillas, different values were found than at the rest of the surveyed sites, characterized by an increase in the concentration of FPOM and, human fecal contamination (although they did not reach dangerous levels) and the response of the macroinvertebrate communities, which resulted in a clear decrease in the IBMWP index and other quality metrics, during the recreational period. These findings suggest that the combined effects of the dams and recreational activities at Las Presillas generate functional dynamics in that alter the habitat in summer. The identification and study of these impacts through the application of innovative indices and quality classes that integrate and contextualize Las Presillas in the SGNP monitoring network, have been identified as key management and conservation tools.","PeriodicalId":49906,"journal":{"name":"Limnetica","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68867398","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}
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