Limnologica最新文献

{"title":"Trace metals and nutrients in tropical volcanic island rivers: Insights on chemical weathering and anthropogenic influences of Pohnpei, Micronesia","authors":"Han Su ,&nbsp;Shan Jiang ,&nbsp;Xiaodao Wei ,&nbsp;Jie Jin ,&nbsp;Yan Chang ,&nbsp;Shuo Jiang ,&nbsp;Xin Shi ,&nbsp;Zheng Bo Liu ,&nbsp;Jing Zhang","doi":"10.1016/j.limno.2023.126087","DOIUrl":"10.1016/j.limno.2023.126087","url":null,"abstract":"<div><p>River systems in tropical islands play a vital role in maintaining the ecosystem function of surrounding oceans by delivering land-derived materials. Researches on tropical river systems frequently focused on continents and peninsulas, while little research has been conducted in tropical islands. In the present study, we conducted field surveys in a Pacific volcanic island, Pohnpei, Micronesia, and determined the substance composition of river waters (major ions, trace metals, nutrients, etc.) to quantify terrestrial material loading and biogeochemical influence on the surrounding oceans. In Pohnpei, total dissolved solutes were observed to be 71.4 mg/L; the NH₄⁺, NO₃⁻, PO₄⁻, and SiO₃^2- concentrations were 0.46, 3.9, 0.52, 221.7 μmol/L, respectively; and NO₂⁻ was lower than the detection limit (0.14 μmol/L). The trace metals concentrations of rivers in Pohnpei Island were much lower than records in tropical rivers of the world. The variation in concentration levels of major ions and nutrients among rivers was relatively limited. A similar pattern was observed in the distribution of Al and V. Trace elements, including As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Se, Sr, U and Zn in rivers were most enriched in Urban Area (human activity dominated region), compared with the Mixing Area (Multiple effect region) to Natural Area (natural weathering region). Exchangeable trace metals concentrations from suspended particulate matter (SPM) were lower than in dissolved state in river waters, while water-soluble, while acid-soluble metals concentrations in the sediment were much higher than in dissolved state in rivers. In our results, trace metals in Pohnpei rivers may mainly be influenced by domestic sewage and agricultural activity—these data can be used in biogeochemical models to estimate the contribution of domestic sewage. Furthermore, we have quantified the land-derived input of trace metals from tropical volcanic islands in Pacific (TVIP) into the surrounding oceans. Though the land area of TVIP only accounts for 0.1 % of global land area, the terrigenous inputs of some trace metals from TVIP account for approximately 1 %—and even more than 2 % of those in global riverine flux. Therefore, the nutrients and trace metals inputs from TVIP would be significant for the cycle of biogenic elements in the receiving ocean.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"101 ","pages":"Article 126087"},"PeriodicalIF":1.7,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43616603","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}

{"title":"Can osmotrophy in Gonyostomum semen explain why lake browning drives an expansion of the alga in parts of Europe?","authors":"Thomas Rohrlack","doi":"10.1016/j.limno.2023.126097","DOIUrl":"10.1016/j.limno.2023.126097","url":null,"abstract":"<div><p><em>Gonyostomum semen</em> experiences a remarkable expansion in parts of Europe, partially driven by rising levels of dissolved organic matter (DOM), also called lake browning. One way to explain the stimulating effect of browning is to assume that <em>G. semen</em> combines photosynthesis with osmotrophy, the ability to utilize DOM as source of nutrients or energy. The present work tested this idea on a nearly unialgal <em>G. semen</em> bloom. Continuous vertical profiling found that each night, <em>G. semen</em> moved into the oxic-anoxic interface or the anoxic hypolimnion, i.e., into places where redox processes can give access to DOM via dissolution of ferric oxide-organic matter complexes. In the hypolimnion, conditions were right for a build-up of DOM, which, however, never happened. Optical analyses of hypolimnetic DOM indicated that the build-up was prevented by the removal of terrestrially derived DOM, which was correlated with <em>G. semen</em>. During the daytime, <em>G. semen</em> migrated into the epilimnion. Here, net oxygen production was near zero, indicating that <em>G. semen</em> combined photosynthesis with heterotrophic nutrition. Optical analyses of epilimnetic DOM hinted at the utilization of terrestrially derived DOM. Taken together, the above findings provide circumstantial evidence for <em>G. semen</em> combining photosynthesis with osmotrophy in nature. The proposed utilization of terrestrially derived DOM suggests that lake browning may favor <em>G. semen</em> by improving the access to DOM that the alga can utilize. Browning may also benefit <em>G. semen</em> by promoting summer anoxia that causes a reductive release of DOM from complexes with ferric oxides, improving the alga’s access to DOM.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"101 ","pages":"Article 126097"},"PeriodicalIF":1.7,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43951192","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}

{"title":"Experimental assessment the effects of saline discharge on plankton community of the recipient freshwater ecosystem – Inputs to scientific ballast water management of inland ports","authors":"Min Yang ,&nbsp;Qiong Wang ,&nbsp;Wenjun Wu ,&nbsp;Xinyan Cheng ,&nbsp;Huixian Wu","doi":"10.1016/j.limno.2023.126095","DOIUrl":"https://doi.org/10.1016/j.limno.2023.126095","url":null,"abstract":"<div><p>Expanding international trade has accelerated the transfer of ballast water worldwide, the change in salinity is expected to be detrimental to recipient areas’ species, especially to freshwater ports’. This study simulated the changes in freshwater plankton community with respect to salinity stress resulting from ballast water discharged. The prepared saline water (simulates ballast water that meets D-2 standards) was discharged into the collected freshwater samples (from natural lake) at different volume ratios, which represented the salinity changes in localized areas of the receiving waters. The samples were counted and identified for ≥ 10–50 µm and ≥ 50 µm organisms with FDA (Florescein Diacetate) &amp; CMFDA (Chloromethylflurescein Diacetate) method and Microscope counting method. From the first day after saline water discharged, it was found that when water salinity reached 12.2 PSU (Practical salinity units), the density of ≥ 50 µm organism was about 0 ind./m³, while only when water salinity reached 24.8 PSU, the density of ≥ 10–50 µm organisms was 0 cells/mL from the sixth day after saline water discharged. When the salinity was less than or equal to 2.1 PSU, the composition of species of ≥ 50 µm organisms in samples were similar to the control group, but for ≥ 10–50 µm organisms, when the salinity was less than or equal to 6.5 PSU, the community structure in samples were similar to the control group. The ≥ 10–50 µm and ≥ 50 µm organisms, these two groups were differently responsive to the changes in salinity. Besides, when the change of water salinity doesn’t exceed 6.5 PSU, the density of plankton first decreased and then increased, but when salinity changes exceed 6.5 PSU, the density of plankton exhibited a great decline during ten days. The results indicated that high-salt ballast water discharge could negatively affect freshwater harbor organisms, the salinity indicators could provide the basis for future studies of actual water samples, pay attention to the impact of ballast water discharge on inland ports is urgent.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"101 ","pages":"Article 126095"},"PeriodicalIF":1.7,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49743322","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}

{"title":"Structural characteristics of tropical headwater streams draining native vegetation and sugarcane cultivation","authors":"Marcus Vinícius França ,&nbsp;Erika Mayumi Shimabukuro ,&nbsp;Ângela Terumi Fushita ,&nbsp;Welber Senteio Smith ,&nbsp;Roseli Frederigi Benassi ,&nbsp;Davi Gasparini Fernandes Cunha ,&nbsp;Ricardo Hideo Taniwaki","doi":"10.1016/j.limno.2023.126099","DOIUrl":"10.1016/j.limno.2023.126099","url":null,"abstract":"<div><p>There is a great relationship between riparian native vegetation and freshwater ecosystems, influencing the functioning and structure of streams and ensuring the maintenance of ecological integrity and functions, such as bank stability, structural stability, organic matter supply, sediment reduction, and thermal regulation, among others. However, several small streams are inserted in large-scale agricultural areas, suffering pressure due to the expansion of agriculture. One of the monocultures that causes stream degradation in São Paulo, Brazil, is sugarcane, causing changes in riparian vegetation characteristics, bank stability, channel geomorphology and hydraulics, and substrate cover, among others. The objective of this study was to evaluate which structural features are most affected in streams draining sugarcane crops and compare them with streams draining native vegetation, also verifying the seasonal influence on each land use. For this, we applied two protocols that characterize aquatic ecosystems, observing the distinction between land use and seasonality in the studied streams. Our results showed that the relevant and most affected parameters were vegetation cover, presence of riparian forest, bank stability, extent and frequency of rapids, velocity/depth regime, epifauna/substrate cover, alteration in the river/stream channel, and streamflow. PERMANOVA analysis comparing structural importance parameters, among different land uses showed significant difference (<em>p</em> &lt; 0.01; F = 73.74) among land uses and showed no significant difference between seasonal periods for streams draining native vegetation (<em>p</em> &gt; 0.05; F = 0.68) and draining sugarcane cultivation (<em>p</em> &gt; 1; F = 0.82). Thus, our study demonstrated the importance of native vegetation in promoting better structural characteristics of headwater streams.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"101 ","pages":"Article 126099"},"PeriodicalIF":1.7,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46590678","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}

{"title":"Impact of land use on water quality and invertebrate assemblages in Indonesian streams","authors":"Satrio Budi Prakoso ,&nbsp;Yo Miyake ,&nbsp;Wataru Ueda ,&nbsp;Hatma Suryatmojo","doi":"10.1016/j.limno.2023.126082","DOIUrl":"10.1016/j.limno.2023.126082","url":null,"abstract":"<div><p>Catchment land use of streams can cause deterioration of the stream ecosystems. Studies on the impact of land use on water quality and invertebrate assemblages in tropical streams are currently less common than studies in temperate regions. In the current study, we conducted a field survey on stream invertebrates and habitat characteristics in 23 streams with different land use conditions in Yogyakarta Province, Java Island, Indonesia. Relationships among catchment characteristics, habitat characteristics, and invertebrate assemblages were analyzed to elucidate the importance of land use and water quality in determining invertebrate assemblages. The analyses, using generalized linear models, showed that the relative area of urban land use of the catchment was strongly and positively related to the nutrient concentration of stream water and negatively related to the taxonomic richness of whole invertebrate assemblages and intolerant taxa. Furthermore, the richness metrics were low in streams with high nutrient concentrations, particularly PO₄-P. The biplot of nonmetric multidimensional scaling showed that there was a gradient in community structure along the tolerance to water pollution that occurred in urban streams. These results collectively suggest that urban land use, not agricultural use, seemed to be a predominant factor causing nutrient enrichment in stream water and low invertebrate diversity through the exclusion of intolerant taxa in Indonesian streams whose catchments are exposed to rapid urbanization. We suggest that the impact of agricultural wastewater on stream water quality is concealed by the strong impact of urbanization when we consider that farming methods are, in general, not intensive in Indonesia, and that advanced wastewater treatment systems have not been widely introduced. Our results strongly support the development of sewage treatment as an effective solution for restoring tropical stream ecosystems.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"101 ","pages":"Article 126082"},"PeriodicalIF":1.7,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48212228","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}

{"title":"A review of 121 years of studies on the freshwater zooplankton of Brazil","authors":"Maria Stela Maioli Castilho-Noll ,&nbsp;Gilmar Perbiche-Neves ,&nbsp;Natan Guilherme dos Santos ,&nbsp;Leilane Talita Fatoreto Schwind ,&nbsp;Fernando Miranda Lansac-Tôha ,&nbsp;Alan Cleber Santos da Silva ,&nbsp;Bianca Ramos de Meira ,&nbsp;Ciro Yoshio Joko ,&nbsp;Cláudio Simões de Morais-Júnior ,&nbsp;Edissa Emi Cortez Silva ,&nbsp;Eneida Maria Eskinazi-Sant'Anna ,&nbsp;Felipe Rafael Oliveira ,&nbsp;Gleice de Souza Santos ,&nbsp;João Vitor Fonseca da Silva ,&nbsp;Jorge Laço Portinho ,&nbsp;Karime de Araujo-Paina ,&nbsp;Laura Jardim Chiarelli ,&nbsp;Leidiane Pereira Diniz ,&nbsp;Louizi de Souza Magalhães Braghin ,&nbsp;Luiz Felipe Machado Velho ,&nbsp;Nadson Ressyé Simões","doi":"10.1016/j.limno.2023.126057","DOIUrl":"10.1016/j.limno.2023.126057","url":null,"abstract":"<div><p>A review was carried out on the freshwater zooplankton in Brazil, between 1900 and 2021, based on 1014 studies, and the main trends were pointed. There was an increase of studies from the 1990 s onwards, especially between 2016 and 2020. Most of them addressed ecological research, followed by taxonomical research in the past (mid-1970 s). Field studies were also more numerous than experimental and review ones, but the latter type also increased between 2016 and 2020. Most studies were developed in limnetic regions and in artificial and natural lakes, in contrast to littoral regions, streams and wetlands. Studies on cladocerans were the most numerous in all environments, followed by Copepoda and Rotifera. Protozooplankton was the least studied group, with a predominance of testate amoebae, followed by ciliates, flagellates and naked amoeba studies. We also discuss some aspects of the ecological traits, such as life cycles and life history, population and community dynamics, interactions with the environment, influence of environmental and anthropogenic factors and interspecific interactions. Studies on populations biomass, secondary production, functional ecology, long term duration and molecular analyzes were the main gaps and the next challenges. Finally, it is also necessary to understand the diversity and related variables in different environments that have few or never been studied.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"100 ","pages":"Article 126057"},"PeriodicalIF":1.7,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48522764","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}

{"title":"Towards a synthesis of the biodiversity of freshwater Protozoa, Rotifera, Cladocera, and Copepoda in Brazil","authors":"L.M.A. Elmoor-Loureiro ,&nbsp;F.D.R. Sousa ,&nbsp;F.R. Oliveira ,&nbsp;C.Y. Joko ,&nbsp;G. Perbiche-Neves ,&nbsp;A.C.S. da Silva ,&nbsp;A.J. Silva ,&nbsp;A.R. Ghidini ,&nbsp;B.R. Meira ,&nbsp;C.E.G. Aggio ,&nbsp;C.S. Morais-Junior ,&nbsp;E.M. Eskinazi-Sant'Anna ,&nbsp;F.M. Lansac-Tôha ,&nbsp;G.S. Cabral ,&nbsp;J.L. Portinho ,&nbsp;J.R. Nascimento ,&nbsp;J.V.F. Silva ,&nbsp;L. Veado ,&nbsp;L.J. Chiarelli ,&nbsp;L.O. Santana ,&nbsp;N.R. Simões","doi":"10.1016/j.limno.2022.126008","DOIUrl":"10.1016/j.limno.2022.126008","url":null,"abstract":"<div><p>Although Brazil is considered a megadiverse country, its rich freshwater biodiversity is still poorly known. A general overview of to-date knowledge on Protozoa, Rotifera, Cladocera, and Copepoda species and distribution in Brazilian Hydrographic Regions is presented here, based on literature data since the 1890s. Ecological studies provided most of the occurrence records. The results show high richness for all studied biological groups and unequal distribution of the occurrence records, which are substantially influenced by research groups’ location. The data also revealed that Brazilian zooplankton biodiversity still needs to be better studied, taxonomically, although from the beginning of the last century until 1980 these kinds of studies were predominant.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"100 ","pages":"Article 126008"},"PeriodicalIF":1.7,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43301523","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}

{"title":"Reprint of: The ecology of the zooplankton in Mexican inland waters: What we know so far","authors":"Javier Alcocer ,&nbsp;Cristian Alberto Espinosa-Rodríguez ,&nbsp;Rocío Fernández ,&nbsp;Alfonso Lugo-Vázquez ,&nbsp;Miroslav Macek ,&nbsp;Alejandro M Maeda-Martínez ,&nbsp;Fernando Martínez-Jerónimo ,&nbsp;Elizabeth Ortega-Mayagoitia ,&nbsp;Luis A Oseguera","doi":"10.1016/j.limno.2023.126084","DOIUrl":"10.1016/j.limno.2023.126084","url":null,"abstract":"<div><p>The varied physiography and climate of the Mexican territory have produced a large mosaic of inland aquatic ecosystems. However, zooplankton ecology has been studied mainly from the water bodies of Central (Trans Mexican Volcanic Belt), eastern (the Yucatán Peninsula), and southern Mexico. In contrast, the zooplankton from the Mesa Central water bodies has been insufficiently investigated. After a long history of zooplankton taxonomic studies, the first contributions to the zooplankton ecology dated to the 1990 s, rapidly increasing afterward. Most ecological information arises from field investigations and experiments under laboratory conditions, lacking mesocosms and whole-lake experiments. In the same way, the studies have been carried out in lentic, natural, and artificial water bodies, primarily eutrophic. Differently, the zooplankton ecology of lotic ecosystems is largely unknown. Here we summarized the progress made in the study of the zooplankton ecology of Mexican inland waters, revealing the most important research topics developed so far.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"100 ","pages":"Article 126084"},"PeriodicalIF":1.7,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45003712","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}

{"title":"Zooplankton studies in Colombian fresh and brackish water ecosystems: A review and future perspectives","authors":"Camilo Andrade-Sossa ,&nbsp;Juan Pablo Alvarez-Silva ,&nbsp;Nelson Aranguren-Riaño ,&nbsp;Osvar Sterling Cupitra-Gómez ,&nbsp;Silvia Lucía Villabona-González ,&nbsp;Angélica M. Torres-Bejarano ,&nbsp;Carlos López","doi":"10.1016/j.limno.2023.126081","DOIUrl":"10.1016/j.limno.2023.126081","url":null,"abstract":"<div><p>Colombia is a global biodiversity hotspot, yet its zooplankton fauna remains poorly explored. In Colombian inland waters, 253 species of rotifers, 119 cladocerans and 82 copepods (not included benthic species) have been reported, in contrast with only 14 genera of protozoa. Most publications report on the Magdalena-Cauca basin, with the highest number of records for lowland areas (&lt; 1000 m.a.s.l.). The least explored regions are the Chocó, Orinoco and Amazon basins. Colombian zooplankton checklists often include several taxa recognized as groups of cryptic species or ones described as cosmopolitan. Integrative taxonomic approaches are scarce, and diversity data need to be validated by molecular analyses and detailed morphological descriptions using optical and scanning electron microscopy. Historical, regional, and local environmental factors that explain the richness, distribution, and the abundance of zooplankton include: water bodies size, hydrological connectivity, trophic status; physical stability and, hydro-climatic patterns of variation. The analysis of ecosystem processes related to patterns in zooplankton communities highlights the importance of detritus as an alternative energy flow path in aquatic ecosystems at all altitude ranges. We propose to strengthen regional studies on functional groups, ecological redundancy, and adaptive traits to evaluate zooplankton responses to climatic, global and local stressors. Due to the great diversity of aquatic ecosystems in the extensive altitudinal gradient of Colombia, it is necessary to expand the coverage of ecological and taxonomic studies to understand zooplankton biodiversity and its role in ecosystem functioning.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"100 ","pages":"Article 126081"},"PeriodicalIF":1.7,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48929082","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}

{"title":"A review of the zooplankton studies in Paraguay’s freshwater environments","authors":"Gustavo A. Villalba Duré ,&nbsp;Gilmar Perbiche-Neves ,&nbsp;Cláudia Costa Bonecker","doi":"10.1016/j.limno.2022.126033","DOIUrl":"10.1016/j.limno.2022.126033","url":null,"abstract":"<div><p>This study is a review of the zooplankton studies in Paraguay, where two of South America’s large hydrographic basins are found those of the Paraguay and Paraná rivers. After exhaustive searches, twenty-two published studies were found, with three of them being developed by national researchers, while all the others were carried out by foreign researchers or with their collaboration. The first studies were done between 1905 and 1936, involving field studies with taxonomy and ecological data and an experimental study testing the influence of temperature and dissolved oxygen on zooplankton. The studies resumed in 1960, presenting mainly data for rotifers, cladocerans and copepods in the plankton community, including taxonomic inventory, richness and species diversity, community composition, beta diversity, abundance and dominance. Most of the studies were carried out in the Paraguay River basin and in the limnetic region of lakes and reservoirs. Some copepod species were typical of lentic or lotic environments and low or high trophic conditions, Overall, 154 zooplankton species were registered (70 rotifers, 51 cladocerans and 33 copepods), with high diversity for Brachionidae and Lecanidae (rotifers), Chydoridae (cladocerans) and Cyclopidae (copepods). The zooplankton richness recorded in Paraguayan territory is lower than in larger and more explored South American countries such as Argentina and Brazil, but similar to found in other countries of a similar size. Moreover, there are few scientific centers and there is low funding for research, which are important factors for the development of scientific knowledge. Planktonic protozoan communities, functional diversity or molecular analyses of zooplankton were the main gaps in the zooplankton studies. Few studies for the zooplankton were published from Paraguay country and more are necessary, close to the main channels of the Paraguay and Paraná rivers, in the Itaipu reservoir and far from these rivers, inside the country, where few or none studies were made.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"100 ","pages":"Article 126033"},"PeriodicalIF":1.7,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47901186","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}