Limnologica最新文献

{"title":"Winter mortality and growth of juvenile noble crayfish (Astacus astacus) under realistic environmental conditions – Implications for conservation management","authors":"Thomas Klefoth ,&nbsp;Sandra Bauschke ,&nbsp;Anni Cetin ,&nbsp;Lennart Dührkoop ,&nbsp;Vanessa Hohnhorst ,&nbsp;Vela Räder ,&nbsp;Pauline Riemann ,&nbsp;Jana Böhme","doi":"10.1016/j.limno.2023.126122","DOIUrl":"https://doi.org/10.1016/j.limno.2023.126122","url":null,"abstract":"<div><p>Noble crayfish (<em>Astacus astacus</em>) are endangered in many parts of Europe. Conservation efforts, including stocking measures, are widely conducted to safeguard the species and associated ecosystem functions. Due to limited availabilities of adult crayfish, juvenile noble crayfish are frequently released into lakes and rivers during autumn, usually without information on their fate and growth during the following winter. To investigate size- and density dependence of winter mortality and growth of newly stocked noble crayfish we conducted a mesocosm experiment in a small artificial lake in northern Germany. The experiment was carried out at water temperatures between 0.7 °C and 9.1 °C from mid-December until mid-March and simulated stocking densities of 20, 60, and 120 crayfish per square meter with unlimited food availability. Winter mortality rates were generally low and strongly size dependent. Specifically, a winter mortality rate of 9.2% was observed and crayfish with a total length (TL) above 34 mm all survived. The relative risk of mortality in dependence of TL increased by 41–94% (95% CI) with every decreasing centimetre of TL at the onset of winter. Increasing density had no effect on winter survival, but tended to reduce growth. Our work indicates that stocking measures of noble crayfish for conservation reasons can decrease costs and increase prospects of success if juveniles larger than 30 mm TL are used as stocking material.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"103 ","pages":"Article 126122"},"PeriodicalIF":1.7,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0075951123000713/pdfft?md5=4aa834ab7138bae0fd1bba84ebfca502&pid=1-s2.0-S0075951123000713-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134656052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Heavy metal bioaccumulation, stable isotope ratios, and human health risks of fishes from urban rivers in Haikou City, China","authors":"Eunice Mutethya, Edwine Yongo, Yu Wenhui, Ji Xu, Hui Yu, Zhiqiang Guo","doi":"10.1016/j.limno.2023.126126","DOIUrl":"https://doi.org/10.1016/j.limno.2023.126126","url":null,"abstract":"Despite its importance as a food source, toxic metals may also be transferred to humans by consuming contaminated fish, causing health risks. Studies on stable isotope ratios provide insight into contamination sources and how the pollutants get into the diet of aquatic organisms. Rivers provide fishes, which form a substantial human food source; hence assessing metal contamination in fish is vital. However, studies are limited on heavy metal contamination in urban rivers in Haikou City, China. Accordingly, this study assessed the heavy metal bioaccumulation and stable isotope ratios of carbon (δ13C) and nitrogen (δ15N) in seven freshwater fish species collected from three urban rivers in Haikou City. The potential heavy metal human health risk was also assessed. Fish gills had significantly (p < 0.05) high Fe, Mn, Cu, Zn, Ni, Cd, Pb, and Co content than muscles. The metal content differed significantly (p < 0.05) regarding fish species type, feeding habits, and living habitat. For example, Anabas testudineus and Parachromis managuensis had the highest and lowest levels, respectively. Herbivorous fishes had the highest metal concentrations, while carnivores had the lowest. The isotope ratios ranged from -32.32‰ to - 14.47‰ for δ¹³C and 3.22‰ to 14.29‰ for δ¹⁵N, suggesting wide energy sources and trophic levels. Omnivorous fishes had a higher δ¹³C than carnivores and herbivores. Regarding living habitats, benthopelagic and demersal fishes had high values of δ¹³C and δ¹⁵N, respectively. The metal concentration correlated negatively with fish length and weight, suggesting a biological dilution. In contrast, Pb and Hg positively correlated with δ¹⁵N, indicating biomagnification along the food chain. The target hazard quotient (THQ) of As and Cr were > 1 in some fishes suggesting potential health risks. Generally, the hazard index (HI) of Anabas testudineus, Coptodon zillii, Mugil cephalus, Oreochromis niloticus, and Oreochromis mossambicus were above 1; thus, their consumption may impair human health. The study provides information on heavy metal contamination and bioaccumulation in fish, which is useful to inform public health and metal pollution control.","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135221155","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 Study on phytoplanktonic diversity of Pothara river, near Khambada, Maharashtra","authors":"P.R. Makde, M.C. Kale","doi":"10.1016/j.limno.2023.126130","DOIUrl":"https://doi.org/10.1016/j.limno.2023.126130","url":null,"abstract":"","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136153008","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":"Geographically-driven shifts in land use influence planktonic community patterns in the Inner Mongolian Plateau lakes","authors":"Yue Geng, Xue Lei, Ruihong Yu, Yuan Li, Xiangwei Li, Heyang Sun, Xingyu Liu, Xiangyu Zhang, Zhuangzhuang Zhang, Jifei Xu, Changwei Lu, Lixin Wang, Jianfeng Wang","doi":"10.1016/j.limno.2023.126120","DOIUrl":"https://doi.org/10.1016/j.limno.2023.126120","url":null,"abstract":"","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136153674","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":"The drivers of benthic macroinvertebrates communities along a subtropical river system: Sediment chemistry or water quality?","authors":"Linton F. Munyai, Akinola Ikudayisi, Mulalo I. Mutoti","doi":"10.1016/j.limno.2023.126121","DOIUrl":"https://doi.org/10.1016/j.limno.2023.126121","url":null,"abstract":"Despite a critical need for ecological risk assessment to preserve and manage aquatic ecosystems in rivers, the impacts of metal pollution on benthic macroinvertebrate species in sub-tropical river system have not been investigated. The main aim of this study was to examine benthic macroinvertebrate community composition in relation to metal concentrations sediments and other physico-chemical variables in the Mutshundudi River system. Benthic macroinvertebrate sampling and community composition analysis, sediment collection, processing, metal analysis and assessment of other variables in the river system were done across two seasons at 12 sampling sites, which were categorized into three segments: Upstream (sampling point 1-5), midstream (sampling point 6-9) and downstream (sampling point 10-12). The results from geo-accumulation (Igeo) values showed that sediments were loaded with Na, Zn, and B in all river segments. Water quality ranged from good at upstream sites due to low anthropogenic activities to very poor in downstream sites due to sewage and urban pollution. Sediments from the Mutshundudi river showed significant differences on high concentrations of metals (i.e., Mg, K, Na and Cu) and Seasonal variations (ANOVA, p < 0.01). Water and sediment chemistry were considered the driving factors of benthic macroinvertebrates, since species densities and composition reduced with a decline in water and sediment quality during both cool-dry and hot-wet seasons. Thus, measures of taxa richness, diversity and densities of macroinvertebrates may provide information on the quality of a river system. Heavy metals, such as Mg, K, Na and Cu in river sediments may pose adverse impact on macroinvertebrate community structure.","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136127190","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":"HABs and HAB nots: Dynamics of phytoplankton blooms across similar oligotrophic reservoirs","authors":"Christina A. Murphy ,&nbsp;Amanda M.M. Pollock ,&nbsp;Ivan Arismendi ,&nbsp;Sherri L. Johnson","doi":"10.1016/j.limno.2023.126110","DOIUrl":"https://doi.org/10.1016/j.limno.2023.126110","url":null,"abstract":"<div><p>Increasing frequency and intensity of cyanobacterial Harmful Algal Blooms (HABs) threaten human and aquatic ecosystem health. Improving our understanding of HABs across a range of systems will be critical to understanding and potentially minimizing risk, especially where HABs are occurring in less productive and less studied waterbodies. Here, the characteristics and annual dynamics of phytoplankton communities were examined, focusing on the timing, magnitude, and predictability of cyanobacterial blooms in five multi-purpose flood-control reservoirs from the Willamette Basin, Oregon, USA. A high similarity in phytoplankton composition and consistency in the timing of cyanobacterial dominance was hypothesized to occur across these oligotrophic reservoirs. However, periods of dominance by potentially HABs producing genera were inconsistent both in their timing and abundances among reservoirs and across years within each reservoir. The lack of regional predictability indicates the importance of local drivers in the formation, intensity, and composition of phytoplankton blooms. These findings have important implications for reservoir management and safeguarding freshwater drinking sources, as not all reservoirs appear to experience cyanobacterial blooms at the same time, demonstrating non-concurrent risks of HABs.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"103 ","pages":"Article 126110"},"PeriodicalIF":1.7,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49742926","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":"How do macroconsumers interact with insect shredders in streams? A laboratory test using shrimp and caddisfly larvae that build cases with different organic materials","authors":"Pâmela Barbosa ,&nbsp;Walace P. Kiffer Jr. ,&nbsp;Larissa C. Costa ,&nbsp;Flávio Mendes ,&nbsp;Marcelo S. Moretti","doi":"10.1016/j.limno.2023.126109","DOIUrl":"https://doi.org/10.1016/j.limno.2023.126109","url":null,"abstract":"<div><p>Negative interactions between macroconsumers and detritivores can influence organic matter processing in streams. We evaluated how the shrimp <em>Macrobrachium potiuna</em> affects the shredding activity and survival of larvae of <em>Phylloicus major</em> and <em>Triplectides gracilis</em>, two caddisfly species that build cases with leaf pieces and tree sticks, respectively. We also evaluated whether the shredding activity of the shrimp changes in the presence of potential prey. We hypothesized that (i) <em>M. potiuna</em> would constrain the rates of leaf consumption and FPOM production of <em>P. major</em> more than <em>T. gracilis</em> and (ii) the shredding activity of the shrimp would increase in the presence of larvae. Laboratory trials were carried out in feeding arenas containing one shrimp, three larvae of one caddisfly species, and leaf discs of <em>Miconia chartacea</em> as food. The visual and chemical stimuli from the shrimp did not change the rates of leaf consumption and FPOM production of either larva. However, when physical contact was allowed, the survival rate of <em>P. major</em> was 35.7 %, while all individuals of <em>T. gracilis</em> remained alive. The shredding activity of <em>M. potiuna</em> was low and observed only in the presence of <em>P. major</em>. These results suggest that although larvae of <em>P. major</em> are less protected against predation, <em>M. potiuna</em> does not constrain the activity of either shredder. Therefore, top-down effects of this macroconsumer on detritus-based food webs dominated by case-building caddisfly shredders are likely context dependent.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"103 ","pages":"Article 126109"},"PeriodicalIF":1.7,"publicationDate":"2023-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49743378","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":"Reduced enumeration effort, but not coarse taxonomic resolution, is sufficient to represent beta diversity patterns of stream benthic diatoms","authors":"Emanuela Castro ,&nbsp;Tadeu Siqueira ,&nbsp;Adriano Sanches Melo ,&nbsp;Luis Mauricio Bini ,&nbsp;Victor Lemes Landeiro ,&nbsp;Fabiana Schneck","doi":"10.1016/j.limno.2023.126107","DOIUrl":"10.1016/j.limno.2023.126107","url":null,"abstract":"<div><p>The use of reduced enumeration effort and coarse taxonomic resolutions are potential strategies for cost-effective biomonitoring programs and biological assessments. We evaluated whether reduced enumeration efforts (i.e., subsets of counted valves per sample) and identification to the genus level are sufficient to recover beta diversity patterns of benthic diatom metacommunities. Diatoms were sampled in 90 riffles within nine near-pristine subtropical streams. We found that reduced enumeration efforts were suitable to depict patterns both in the compositions of the communities and in biotic heterogeneity among streams produced by the original dataset (i.e., species-level identifications and 500 valves counted per riffle, the local community). A total of 400 and 50 valves were necessary to obtain similar compositional patterns observed using full samples identified at the species level for presence-absence and abundance data, respectively. Furthermore, biotic heterogeneity patterns among streams were recovered with 200 valves per local community for both presence-absence and abundance data. Identification to the genus level only reflected species-level compositional patterns when abundance data were used. However, the use of genus was not effective in depicting biotic heterogeneity patterns, independent of the enumeration effort. These results indicate that it is possible to reduce enumeration efforts, but not taxonomic resolution, to detect subtle regional biodiversity patterns of benthic diatoms in subtropical streams not subjected to strong environmental gradients. This is especially important due to the financial challenges faced by ecological and applied monitoring programs in tropical regions.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"102 ","pages":"Article 126107"},"PeriodicalIF":1.7,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42594288","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":"Daily responses of the planktonic food web to environmental dynamics in the vegetated littoral zone of a large shallow lake","authors":"Luana Morais da Rosa ,&nbsp;Luciana de Souza Cardoso ,&nbsp;Mônica Hessel Silveira ,&nbsp;Luciane Oliveira Crossetti ,&nbsp;Eliete Regina Bertazzo Canterle ,&nbsp;José Rafael Cavalcanti ,&nbsp;David da Motta-Marques ,&nbsp;Lúcia Ribeiro Rodrigues","doi":"10.1016/j.limno.2023.126096","DOIUrl":"10.1016/j.limno.2023.126096","url":null,"abstract":"&lt;div&gt;&lt;p&gt;Littoral zones are the most productive areas of shallow lakes and make important contributions to energy transfer to higher trophic levels in aquatic ecosystems. Great habitat heterogeneity characterizes the littoral ecosystems, often encompassing macrophyte covered areas that provide microhabitats with diverse structural complexity, and several effects over the structure and function of biological communities. The effects of macrophytes on trophic interactions are more complex in subtropical lakes than in temperate lakes. The relationships between planktonic food web components and the effects of a highly dynamic environment in structuring plankton communities were studied in a large subtropical shallow lake. The study was conducted for twenty-five consecutive days in the summer of 2016 at two sites (Station 1 and Station 2) in the well-developed littoral zone of Lake Mangueira hosting different plant life forms. Strong spatial variation between sampling stations was evidenced in the density of most of the communities, with the highest means of bacterioplankton, phytoplankton, and ciliates density being recorded at the station surrounded mainly by submerged macrophytes (Station 1). These plants particularly modify microhabitat complexity by increasing the availability and functional diversity of niches. Furthermore, submerged macrophytes tend to accumulate more periphyton biomass, a quality food resource for many consumers. Important grazing relationships, nutrient demands, and trophic structure were assessed through carbon biomass of the communities. Phytoplankton accounted for a greater proportion of the entire plankton community than bacteria, while zooplankton had low carbon biomass of crustaceans and a high dominance of ciliates and rotifers, with a greater grazing impact on bacterioplankton than on phytoplankton. According to RDA and multiple-regression analysis, nutrients and humic substances were the main predictors of variability in the littoral food web components over a short-sampling interval. The carbon biomass of bacteria and metazooplankton were both positively related to humic substances and nutrients at Station 1, as well as the biomass ratio of metazooplankton to phytoplankton and metazooplankton to ciliates. This suggests that humic substances have been metabolized by bacteria and transferred to higher trophic levels through predation. On the other hand, humic substances negatively affected the carbon biomass of bacteria and cyanobacteria at Station 2, suggesting a mostly refractory DOC around the emergent plants. Results indicate that despite the greater importance of bacterial biomass in the energy transfer through zooplankton predation, the efficiency of carbon transfer in algal and bacteria-based food webs was both very low. The effects of macrophytes on the quantity and/or quality of nutrients and substrates for bacteria uptake and phytoplankton requirements, explained the spatial variability of plankton food web ","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"102 ","pages":"Article 126096"},"PeriodicalIF":1.7,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43996277","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":"Freshwater biomonitoring with macroinvertebrates in the Philippines: Towards the development of the Philippine biotic index","authors":"Francis S. Magbanua ,&nbsp;Jacqueline E. Hilario ,&nbsp;John Claude Renan B. Salluta ,&nbsp;Bryan C. Alpecho ,&nbsp;Sedney S. Mendoza ,&nbsp;Ireneo L. Lit Jr","doi":"10.1016/j.limno.2023.126098","DOIUrl":"10.1016/j.limno.2023.126098","url":null,"abstract":"<div><p>Streams and rivers are the most threatened and exploited freshwater ecosystems worldwide. Land-use changes, particularly the conversion of forests to agricultural, residential, and industrial areas, have greatly impacted them, leading to declining water body quality and biodiversity loss. Thus, evaluating rivers and identifying threats is crucial to protect and rehabilitate them adequately. A combination of physical, chemical, and biological indicators in assessing the ecological conditions of aquatic ecosystems is now a prerequisite. Most river biomonitoring studies focus on benthic macroinvertebrates. However, river biomonitoring is not commonly practiced in the Philippines as it is not implemented regularly and officially. This review aims to determine macroinvertebrate families that could serve as sensitive bioindicators of river ecosystem health, determine the overall status of streams and rivers based on benthic macroinvertebrate assemblages, and identify research gaps to guide the development of a macroinvertebrate-based biomonitoring tool. Using Google Scholar, we conducted a quantitative search of studies that assessed water body quality and condition of streams and rivers in the Philippines using benthic macroinvertebrates published from January 2000 to December 2021. Of the 945 search results, 23 studies satisfied the criteria for inclusion in this review. These studies covered 35 Philippine rivers distributed in Luzon (18), Visayas (10), and Mindanao (7). Of the 166 benthic macroinvertebrate families, one family (Hebridae; velvet water bugs) was found solely in the Class AA water body (waters in uninhabited watersheds or declared protected areas based on the Philippine water quality guidelines), 18 in A (intended as a source of drinking water), 17 in C (boating, fishing, aquaculture, agriculture, irrigation and livestock watering), and only one (Amnicolidae; freshwater snail) was found in D (navigable waters). However, none of the studies assessed streams or rivers solely under Class B (intended for primary contact recreation). In addition, several single-metric biotic indicators commonly used in the Philippines varied in their evaluation of the stream condition. Thus, we propose developing a macroinvertebrate-based, multimetric biotic index to assess stream and river health in the Philippines.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"102 ","pages":"Article 126098"},"PeriodicalIF":1.7,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46739223","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}