The first studies on the micro-organisms inhabiting Sicilian inland waters date back to the middle of the XIX century. However, these were based on single samples and mainly addressed at compiling faunistic and floristic inventories. It was in the first decades of the XX century that the first methodical studies were performed, which focussed on assessing microbial diversity in saline and hypersaline inland waters. Studies on plankton dynamics in ponds and reservoirs of the island started at the beginning of the 1980s and, since the end of the 1990s, temporary waters have also been intensively sampled, especially as regards phytoplankton and micro-crustaceans. These intensified sampling efforts contributed to increasing our knowledge of the composition, structure and functioning of the planktic compartment. On the contrary, studies on benthic microflora and fauna are still numerically scarce and mostly based on occasional collections. Also, running waters have received little attention and the methodical analysis of their micro-organisms is still in its infancy.
{"title":"A century of research on micro-organisms from the inland waters of the largest Mediterranean island","authors":"F. Marrone, Luigi Naselli-Flores","doi":"10.4081/aiol.2022.11033","DOIUrl":"https://doi.org/10.4081/aiol.2022.11033","url":null,"abstract":"The first studies on the micro-organisms inhabiting Sicilian inland waters date back to the middle of the XIX century. However, these were based on single samples and mainly addressed at compiling faunistic and floristic inventories. It was in the first decades of the XX century that the first methodical studies were performed, which focussed on assessing microbial diversity in saline and hypersaline inland waters. Studies on plankton dynamics in ponds and reservoirs of the island started at the beginning of the 1980s and, since the end of the 1990s, temporary waters have also been intensively sampled, especially as regards phytoplankton and micro-crustaceans. These intensified sampling efforts contributed to increasing our knowledge of the composition, structure and functioning of the planktic compartment. On the contrary, studies on benthic microflora and fauna are still numerically scarce and mostly based on occasional collections. Also, running waters have received little attention and the methodical analysis of their micro-organisms is still in its infancy.","PeriodicalId":37306,"journal":{"name":"Advances in Oceanography and Limnology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48227559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Zaupa, D. Fontaneto, Raffaella Sabatino, A. Boggero
This study represents a first reference database of genetic diversity of macroinvertebrates for a barcoding marker for Lake Maggiore, focusing on the two dominant groups of the littoral benthic fauna (chironomids and oligochaetes), commonly used for biological monitoring of freshwater lakes. Sediment samples were sorted at the stereomicroscope and single animals were cut in two pieces, one piece to be used for morphological identification and one piece for DNA extraction. This study allowed us to collect and identify 427 organisms: 309 oligochaetes belonging to 27 identifiable taxa and 118 chironomid larvae belonging to 26 identifiable taxa. Four families of oligochaetes: Naididae, Lumbricidae, Lumbriculidae, and Enchytraeidae and five subfamilies of Chironomidae: Chironominae, Tanypodinae, Orthocladiinae, Diamesinae, and Prodiamesinae were found. The extraction and amplification of the DNA covered a total of 10 oligochaete taxa. For 7 of them (Ophidonais serpentina, Uncinais uncinata, Vejdovskyella intermedia, Psammoryctides barbatus, Limnodrilus hoffmeisteri, Tubifex tubifex, and Bothrioneurum vejdovskyanum), we found other sequences in GenBank to compare genetic similarities with available data. For the other taxa (Lumbriculidae, and Enchytraeidae, and Nais sp.) no best hits were found in GenBank. The extraction and amplification of the DNA covered a total of 21 chironomid taxa. For ten species (Cladotanytarsus mancus, Cladotanytarsus atridorsum, Polypedilum scalaenum, Polypedilum nubeculosum, Benthalia carbonaria, Phaenopsectra flavipes, Clinotanypus nervosus, Paracladopelma laminatum, Cryptochironomus rostratus and Parakiefferiella finnmarkica) sequences were available in GenBank to compare genetic similarities. For the other taxa (Cryptochironomus sp., Demicryptochironomus vulneratus, Chironomus sp., Stictochironomus sp., Orthocladius sp., Cricotopus sp., Eukiefferiella sp., Procladius sp., Diamesa sp., Potthastia sp., and Monodiamesa bathyphila) no best hits were found in GenBank. For chironomids, DNA taxonomy revealed the existence of several species complexes. Covering more populations and more genetic markers for those taxa within a rationale of integrative taxonomy could solve the taxonomic problems and provide a reliable description of diversity.
{"title":"Building a local reference library for metabarcoding survey of lake macrobenthos: oligochaetes and chironomids from Lake Maggiore","authors":"S. Zaupa, D. Fontaneto, Raffaella Sabatino, A. Boggero","doi":"10.4081/aiol.2022.11051","DOIUrl":"https://doi.org/10.4081/aiol.2022.11051","url":null,"abstract":"This study represents a first reference database of genetic diversity of macroinvertebrates for a barcoding marker for Lake Maggiore, focusing on the two dominant groups of the littoral benthic fauna (chironomids and oligochaetes), commonly used for biological monitoring of freshwater lakes. Sediment samples were sorted at the stereomicroscope and single animals were cut in two pieces, one piece to be used for morphological identification and one piece for DNA extraction. This study allowed us to collect and identify 427 organisms: 309 oligochaetes belonging to 27 identifiable taxa and 118 chironomid larvae belonging to 26 identifiable taxa. Four families of oligochaetes: Naididae, Lumbricidae, Lumbriculidae, and Enchytraeidae and five subfamilies of Chironomidae: Chironominae, Tanypodinae, Orthocladiinae, Diamesinae, and Prodiamesinae were found. The extraction and amplification of the DNA covered a total of 10 oligochaete taxa. For 7 of them (Ophidonais serpentina, Uncinais uncinata, Vejdovskyella intermedia, Psammoryctides barbatus, Limnodrilus hoffmeisteri, Tubifex tubifex, and Bothrioneurum vejdovskyanum), we found other sequences in GenBank to compare genetic similarities with available data. For the other taxa (Lumbriculidae, and Enchytraeidae, and Nais sp.) no best hits were found in GenBank. The extraction and amplification of the DNA covered a total of 21 chironomid taxa. For ten species (Cladotanytarsus mancus, Cladotanytarsus atridorsum, Polypedilum scalaenum, Polypedilum nubeculosum, Benthalia carbonaria, Phaenopsectra flavipes, Clinotanypus nervosus, Paracladopelma laminatum, Cryptochironomus rostratus and Parakiefferiella finnmarkica) sequences were available in GenBank to compare genetic similarities. For the other taxa (Cryptochironomus sp., Demicryptochironomus vulneratus, Chironomus sp., Stictochironomus sp., Orthocladius sp., Cricotopus sp., Eukiefferiella sp., Procladius sp., Diamesa sp., Potthastia sp., and Monodiamesa bathyphila) no best hits were found in GenBank. For chironomids, DNA taxonomy revealed the existence of several species complexes. Covering more populations and more genetic markers for those taxa within a rationale of integrative taxonomy could solve the taxonomic problems and provide a reliable description of diversity.","PeriodicalId":37306,"journal":{"name":"Advances in Oceanography and Limnology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43141764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Flavia Zanon, C. Cesarano, Y. Cotroneo, G. Fusco, G. Budillon, G. Aulicino
In recent years, rapid advances in technologies have allowed significant positive changes within the field of satellite observations of the global ocean. This paper reviews the available global scientific literature that focuses on the study of salinity by remote sensing, tracking its evolution and trends by combining social network analysis and bibliometrics. Furthermore, the study shows the relationships and co-occurrences between authors, countries and keywords retrieved from the abstracts and citations database provided by Scopus. An analysis of 581 publications has been carried out. The achieved results, which highlight a worldwide increase in scientific interest in this field over the last decade, may constitute a useful tool for a global vision and for a potential improvement in the international efforts employed in the study of salinity from remote sensing.
{"title":"Remote sensing of sea surface salinity: A bibliometric analysis","authors":"Flavia Zanon, C. Cesarano, Y. Cotroneo, G. Fusco, G. Budillon, G. Aulicino","doi":"10.4081/aiol.2022.10862","DOIUrl":"https://doi.org/10.4081/aiol.2022.10862","url":null,"abstract":"In recent years, rapid advances in technologies have allowed significant positive changes within the field of satellite observations of the global ocean. This paper reviews the available global scientific literature that focuses on the study of salinity by remote sensing, tracking its evolution and trends by combining social network analysis and bibliometrics. Furthermore, the study shows the relationships and co-occurrences between authors, countries and keywords retrieved from the abstracts and citations database provided by Scopus. An analysis of 581 publications has been carried out. The achieved results, which highlight a worldwide increase in scientific interest in this field over the last decade, may constitute a useful tool for a global vision and for a potential improvement in the international efforts employed in the study of salinity from remote sensing.","PeriodicalId":37306,"journal":{"name":"Advances in Oceanography and Limnology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47763745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Viruses are the most abundant biological entities of the global ocean and have a pervasive role in marine ecosystems because, being a major cause of mortality, they module the functioning of food webs, and biogeochemical cycling. This role is due not only to their ability to infect and lyse marine organisms but also to the decomposition of their particles (viral decay). The organic matter of viral origin, indeed, can be recycled by benthic organisms thus representing an additional important food source for their metabolism, especially in deep-sea sediments, characterized by very low availability of trophic resources. This short note will present an overview of the available information on viral decay in deep-sea benthic ecosystems.
{"title":"Deep-sea benthic ecosystems waste nothing and recycle everything, even viruses","authors":"C. Corinaldesi","doi":"10.4081/aiol.2022.11053","DOIUrl":"https://doi.org/10.4081/aiol.2022.11053","url":null,"abstract":"Viruses are the most abundant biological entities of the global ocean and have a pervasive role in marine ecosystems because, being a major cause of mortality, they module the functioning of food webs, and biogeochemical cycling. This role is due not only to their ability to infect and lyse marine organisms but also to the decomposition of their particles (viral decay). The organic matter of viral origin, indeed, can be recycled by benthic organisms thus representing an additional important food source for their metabolism, especially in deep-sea sediments, characterized by very low availability of trophic resources. This short note will present an overview of the available information on viral decay in deep-sea benthic ecosystems.","PeriodicalId":37306,"journal":{"name":"Advances in Oceanography and Limnology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44626133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper presents the spatial and temporal regularities of the course of ice processes in the White Sea, derived from satellite data observations for the period 2004-2020. The dependences, defining indicative dates of the White Sea ice regime of air temperature regime over its water area are given, which can be used for diagnostic and prognostic purposes. It is noted that the connection with the Barents Sea has a significant impact on the course of the ice regime of the White Sea, in particular, on the beginning freeze-up phase and the beginning break-up phase. Comparative analysis of seasonal variations in ice coverage in the White Sea indicates that the course of the ice regime in recent years generally corresponds to how it happened in the second half of the XX century, however, a decrease in average values of ice coverage by 3-7% was recorded throughout the entire period of ice phenomena, which is in line with the global warming trend. Also, the results of the effects of abnormally warm winter on the formation of the White Sea ice regime of 2019-2020 are presented.
{"title":"Spatio-temporal regularities of the White Sea ice regime formation","authors":"Vyacheslav Nikolaevich Baklagin","doi":"10.4081/aiol.2022.9849","DOIUrl":"https://doi.org/10.4081/aiol.2022.9849","url":null,"abstract":"The paper presents the spatial and temporal regularities of the course of ice processes in the White Sea, derived from satellite data observations for the period 2004-2020. The dependences, defining indicative dates of the White Sea ice regime of air temperature regime over its water area are given, which can be used for diagnostic and prognostic purposes. It is noted that the connection with the Barents Sea has a significant impact on the course of the ice regime of the White Sea, in particular, on the beginning freeze-up phase and the beginning break-up phase. Comparative analysis of seasonal variations in ice coverage in the White Sea indicates that the course of the ice regime in recent years generally corresponds to how it happened in the second half of the XX century, however, a decrease in average values of ice coverage by 3-7% was recorded throughout the entire period of ice phenomena, which is in line with the global warming trend. Also, the results of the effects of abnormally warm winter on the formation of the White Sea ice regime of 2019-2020 are presented.","PeriodicalId":37306,"journal":{"name":"Advances in Oceanography and Limnology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46392670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. J. Martínez, Francoise Cavada-Blanco, J. Cappelletto, Esteban Agudo-Adriani, Croquer Aldo
Acropora cervicornis is one of the most important coral species in shallow reefs of the Caribbean as it provides habitat and structural complexity to several species of invertebrates and fish. However, the distribution range of A. cervicornis has shrunk and collapsed considerably during the last five decades, due to a combination of factors including the increase of disease prevalence, storm frequency, and anthropogenic threats. Despite being classed as “Critically Endangered” in the IUCN Red List, information regarding its population status and condition across large Caribbean coralline areas is limited. Herein we conducted the first Marine Protected Area (MPA) scale survey for this species at the Los Roques archipelago, which included visual census across 127 sites to determine the abundance, spatial distribution, habitat type (i.e., leeward, windward), and patch morphology of A. cervicornis (i.e., continuous, dispersed, scatter, isolated). We selected 11 sites, where this species was predicted and reported to be ubiquitous, to determine live A. cervicornis cover, its recent and old mortality cover, and white band disease prevalence as proxies for coral health. For this, four 25-m long photomosaics were analysed at each site. We found Acropora cervicornis in only 29% of the surveyed sites; indicating that this species currently has a narrow and very restricted distribution in Los Roques and suggesting that either this species is rare or has declined over the past decades within the MPA. Dispersed and scattered patches prevailed upon continuous patches, which only occurred in two of the surveyed sites. Moreover, these patches were located near the largest human population settlements, and inside the low protection zones of the MPA where fishing and touristic activities are permitted. The photomosaic survey showed that more than 75% A. cervicornis patches showed an average live cover above 27%, low prevalence of white band disease (<7%), and low macroalgal abundance (<10%); suggesting that Los Roques still holds healthy populations. Our results indicate that the persistence of this species urgently requires re-evaluating current MPA zoning, especially following recent evidence of overfishing and inadequate law enforcement. This study provides a baseline of A. cervicornis populations in Los Roques and Southern Caribbean that can be later used for local population management and conservation.
{"title":"Distribution, abundance, and health indicators of the critically endangered coral species Acropora cervicornis in Los Roques National Park, 2014","authors":"S. J. Martínez, Francoise Cavada-Blanco, J. Cappelletto, Esteban Agudo-Adriani, Croquer Aldo","doi":"10.4081/aiol.2021.10005","DOIUrl":"https://doi.org/10.4081/aiol.2021.10005","url":null,"abstract":"Acropora cervicornis is one of the most important coral species in shallow reefs of the Caribbean as it provides habitat and structural complexity to several species of invertebrates and fish. However, the distribution range of A. cervicornis has shrunk and collapsed considerably during the last five decades, due to a combination of factors including the increase of disease prevalence, storm frequency, and anthropogenic threats. Despite being classed as “Critically Endangered” in the IUCN Red List, information regarding its population status and condition across large Caribbean coralline areas is limited. Herein we conducted the first Marine Protected Area (MPA) scale survey for this species at the Los Roques archipelago, which included visual census across 127 sites to determine the abundance, spatial distribution, habitat type (i.e., leeward, windward), and patch morphology of A. cervicornis (i.e., continuous, dispersed, scatter, isolated). We selected 11 sites, where this species was predicted and reported to be ubiquitous, to determine live A. cervicornis cover, its recent and old mortality cover, and white band disease prevalence as proxies for coral health. For this, four 25-m long photomosaics were analysed at each site. We found Acropora cervicornis in only 29% of the surveyed sites; indicating that this species currently has a narrow and very restricted distribution in Los Roques and suggesting that either this species is rare or has declined over the past decades within the MPA. Dispersed and scattered patches prevailed upon continuous patches, which only occurred in two of the surveyed sites. Moreover, these patches were located near the largest human population settlements, and inside the low protection zones of the MPA where fishing and touristic activities are permitted. The photomosaic survey showed that more than 75% A. cervicornis patches showed an average live cover above 27%, low prevalence of white band disease (<7%), and low macroalgal abundance (<10%); suggesting that Los Roques still holds healthy populations. Our results indicate that the persistence of this species urgently requires re-evaluating current MPA zoning, especially following recent evidence of overfishing and inadequate law enforcement. This study provides a baseline of A. cervicornis populations in Los Roques and Southern Caribbean that can be later used for local population management and conservation.","PeriodicalId":37306,"journal":{"name":"Advances in Oceanography and Limnology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47880066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gabriele Del Gaizo, L. Russo, M. Abagnale, Angela Buondonno, M. Furia, S. Saviano, Mauro Vargiu, F. Conversano, F. Margiotta, M. Saggiomo, I. Percopo, D. D’Alelio
Plankton communities include both unicellular and multicellular organisms. An important unicellular component is represented by those protists (i.e., unicellular eukaryotes) that are non-strictly autotrophic organisms and consume bacteria and other protists. These organisms are an important link between primary producers and metazoans and are usually known as microzooplankton, protozooplankton, or mixoplankton, as many of them couple phagotrophic and photoautotrophic behaviours. Herein we report on the diversity of these organisms sampled at two sampling sites (coastal and offshore stations), at two depths (0 and 10 m), in the Gulf of Naples during the early autumn of 2020. Despite efforts to list plankton biodiversity of primary producers and metazoan grazers made in this area so far, protistan grazers are still poorly investigated and previous information date back to decades ago. Our survey identified dinoflagellates and oligotrich ciliates as the most abundant groups, while tintinnids were less quantitatively relevant. The taxonomic composition in samples investigated herein remarked that reported by previous studies, with the sole exception of the tintinnid Ascampbeliella armilla, which was never reported before. A coastal-offshore gradient in the taxonomical composition of protistan grazers was also observed, with some species more abundant within coastal waters and other better thriving in offshore ones. Surface and sub-surface communities also differed in terms of species composition, with the deeper communities in the two sites being more similar reciprocally than with communities at the surface. These differences were associated with distinct environmental conditions, such as light availability, as well with the standing feeding environment, arising potential implications in the functioning of the planktonic food web at the local scale.
{"title":"A biodiversity survey on the planktonic protistan grazers of the Gulf of Naples (Italy)","authors":"Gabriele Del Gaizo, L. Russo, M. Abagnale, Angela Buondonno, M. Furia, S. Saviano, Mauro Vargiu, F. Conversano, F. Margiotta, M. Saggiomo, I. Percopo, D. D’Alelio","doi":"10.4081/aiol.2021.10018","DOIUrl":"https://doi.org/10.4081/aiol.2021.10018","url":null,"abstract":"Plankton communities include both unicellular and multicellular organisms. An important unicellular component is represented by those protists (i.e., unicellular eukaryotes) that are non-strictly autotrophic organisms and consume bacteria and other protists. These organisms are an important link between primary producers and metazoans and are usually known as microzooplankton, protozooplankton, or mixoplankton, as many of them couple phagotrophic and photoautotrophic behaviours. Herein we report on the diversity of these organisms sampled at two sampling sites (coastal and offshore stations), at two depths (0 and 10 m), in the Gulf of Naples during the early autumn of 2020. Despite efforts to list plankton biodiversity of primary producers and metazoan grazers made in this area so far, protistan grazers are still poorly investigated and previous information date back to decades ago. Our survey identified dinoflagellates and oligotrich ciliates as the most abundant groups, while tintinnids were less quantitatively relevant. The taxonomic composition in samples investigated herein remarked that reported by previous studies, with the sole exception of the tintinnid Ascampbeliella armilla, which was never reported before. A coastal-offshore gradient in the taxonomical composition of protistan grazers was also observed, with some species more abundant within coastal waters and other better thriving in offshore ones. Surface and sub-surface communities also differed in terms of species composition, with the deeper communities in the two sites being more similar reciprocally than with communities at the surface. These differences were associated with distinct environmental conditions, such as light availability, as well with the standing feeding environment, arising potential implications in the functioning of the planktonic food web at the local scale.","PeriodicalId":37306,"journal":{"name":"Advances in Oceanography and Limnology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46831037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Mwijage, Theresia John Lyasenga, D. Shilla, John Andrew Marco Mahugija, L. Gaspare, Prosper Laurent Mfilinge, D. Shilla
Diverse anthropogenic activities including alteration of hydrological regime and agricultural development in the upstream of the river catchments modify the structural components and ecological roles of the species in estuarine ecosystems. The present study compared the diet, carbon (δ13C) and nitrogen (δ15N) isotopic signals, trophic niches and metrics of trophic redundancy of predatory fish and their potential phytodetritivore prey-fish between two estuaries with different degrees of anthropogenic disturbances. The δ13C and δ15N signals, Bayesian mixing models and stomach content analyses were adopted. It was revealed that the diet among the predators Arius africanus, Epinephelus coioides, Sillago sihama and Pomadasys argenteus and their isotopic signals including their phytodetritivore-prey, Valamugil buchanani were significantly different between Wami and Pangani estuaries (PERMANOVA, Pseudo –F ≥ 3.1, p = 0.05). The total isotopic niche area between estuaries accounted by the comparable Bayesian standard ellipse area (SEAb) was significantly smaller in Wami than that of Pangani (t-test, t = 4.3, p < .001). The ANOVA test further confirmed significant variation in SEAb among fish populations in two estuaries (F = 27.84, p < 0.001). The Layman metric indices of trophic diversity and redundancy of Wami estuary were substantially smaller than those observed at Pangani estuary. These findings mean that despite Wami estuary being under conservation status, the extent of disturbances in the upstream is high enough to induce the ecological changes at the base of the food web, subsequently cascading its effect up to the higher-order consumers of the ecosystem. As a result, the ecological redundancy and ecosystem complexity of Wami is somewhat compromised relative to that of Pangani estuary. Therefore, the degree of anthropogenic disturbances in river catchments affect differently the trophic niches of predatory and phytodetritivore fish and hence overall food web structures, trophic redundancy and complexity of estuarine ecosystems.
不同的人类活动，包括水文状况的改变和河流流域上游的农业发展，改变了物种在河口生态系统中的结构组成和生态作用。本研究比较了两个不同人为干扰程度的河口的食性鱼类及其潜在的植物营养猎物的饮食、碳(δ13C)和氮(δ15N)同位素信号、营养生态位和营养冗余指标。采用δ13C和δ15N信号、贝叶斯混合模型和胃内容物分析。结果表明，瓦米河口和潘加尼河口的捕食者非洲Arius anus、Epinephelus coioides、siillago sihama和Pomadasys argteus的食性及其同位素信号(包括它们的植物腐食猎物Valamugil buchanani)存在显著差异(PERMANOVA, Pseudo -F≥3.1,p = 0.05)。比较贝叶斯标准椭圆面积(SEAb)所占河口间总同位素生态位面积在瓦米显著小于潘加尼(t-检验，t = 4.3, p < .001)。方差分析进一步证实了两个河口鱼类种群之间SEAb的显著差异(F = 27.84, p < 0.001)。瓦米河口的营养多样性和冗余度的Layman度量指数明显小于潘加尼河口。这些发现意味着，尽管瓦米河口处于保护状态，但上游的干扰程度足以引起食物网底部的生态变化，随后将其影响级联到生态系统的高阶消费者。因此，瓦米河口的生态冗余度和生态系统复杂性相对于潘加尼河口有所降低。因此，河流流域的人为干扰程度对掠食性和植食性鱼类的营养生态位有不同的影响，从而影响了整体食物网结构、营养冗余和河口生态系统的复杂性。
{"title":"Diet and isotopic niche dimensions of predatory fish in two estuaries with different degrees of anthropogenic disturbances: a case study of Wami and Pangani Tanzanian coastal estuaries","authors":"A. Mwijage, Theresia John Lyasenga, D. Shilla, John Andrew Marco Mahugija, L. Gaspare, Prosper Laurent Mfilinge, D. Shilla","doi":"10.4081/aiol.2021.9987","DOIUrl":"https://doi.org/10.4081/aiol.2021.9987","url":null,"abstract":"Diverse anthropogenic activities including alteration of hydrological regime and agricultural development in the upstream of the river catchments modify the structural components and ecological roles of the species in estuarine ecosystems. The present study compared the diet, carbon (δ13C) and nitrogen (δ15N) isotopic signals, trophic niches and metrics of trophic redundancy of predatory fish and their potential phytodetritivore prey-fish between two estuaries with different degrees of anthropogenic disturbances. The δ13C and δ15N signals, Bayesian mixing models and stomach content analyses were adopted. It was revealed that the diet among the predators Arius africanus, Epinephelus coioides, Sillago sihama and Pomadasys argenteus and their isotopic signals including their phytodetritivore-prey, Valamugil buchanani were significantly different between Wami and Pangani estuaries (PERMANOVA, Pseudo –F ≥ 3.1, p = 0.05). The total isotopic niche area between estuaries accounted by the comparable Bayesian standard ellipse area (SEAb) was significantly smaller in Wami than that of Pangani (t-test, t = 4.3, p < .001). The ANOVA test further confirmed significant variation in SEAb among fish populations in two estuaries (F = 27.84, p < 0.001). The Layman metric indices of trophic diversity and redundancy of Wami estuary were substantially smaller than those observed at Pangani estuary. These findings mean that despite Wami estuary being under conservation status, the extent of disturbances in the upstream is high enough to induce the ecological changes at the base of the food web, subsequently cascading its effect up to the higher-order consumers of the ecosystem. As a result, the ecological redundancy and ecosystem complexity of Wami is somewhat compromised relative to that of Pangani estuary. Therefore, the degree of anthropogenic disturbances in river catchments affect differently the trophic niches of predatory and phytodetritivore fish and hence overall food web structures, trophic redundancy and complexity of estuarine ecosystems.","PeriodicalId":37306,"journal":{"name":"Advances in Oceanography and Limnology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47249969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-15DOI: 10.1127/adv_limnol/2021/0075
D. Bogdanov, D. Sendek, D. Lajus
{"title":"Coregonine fisheries in the eastern Gulf of Finland, Baltic Sea: history and current status","authors":"D. Bogdanov, D. Sendek, D. Lajus","doi":"10.1127/adv_limnol/2021/0075","DOIUrl":"https://doi.org/10.1127/adv_limnol/2021/0075","url":null,"abstract":"","PeriodicalId":37306,"journal":{"name":"Advances in Oceanography and Limnology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78253928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-15DOI: 10.1127/adv_limnol/2021/0073
J. Wanzenböck
{"title":"Rearing and stocking of coregonids: a comparison of aquaculture practices in Eurasia and North America","authors":"J. Wanzenböck","doi":"10.1127/adv_limnol/2021/0073","DOIUrl":"https://doi.org/10.1127/adv_limnol/2021/0073","url":null,"abstract":"","PeriodicalId":37306,"journal":{"name":"Advances in Oceanography and Limnology","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74747341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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：