Freshwater Science最新文献

{"title":"Sulfur stable isotopes as a tracer of insect migration and consumption by fish predators","authors":"Stephen Srayko, T. Jardine, Iain D. Phillips, Christy M. Morrissey, D. Chivers","doi":"10.1086/725766","DOIUrl":"https://doi.org/10.1086/725766","url":null,"abstract":"Resource flows between freshwater ecosystems can greatly affect foodweb dynamics. The seasonal movement of a family of aquatic insects, water boatmen, or corixids (Hemiptera: Corixidae) represents an important transfer of resources between wetland and river ecosystems. Corixids migrate en masse from wetlands in the North American prairies to rivers every autumn to overwinter. In the North and South Saskatchewan rivers, Saskatchewan, Canada, several fish species prey upon these migratory corixids. Here, we examined the utility of the stable isotope ratio of sulfur, δ34S, in tracing the migration of corixids between wetlands and the North and South Saskatchewan rivers. We also assessed the extent to which riverine fish use migratory corixids as a dietary subsidy. We found that both corixids and other wetland invertebrates exhibited a mean δ34S value of −10.5 ± 5.8‰, lower than riverine invertebrates at −4.1 ± 4.1‰. Specifically, riverine invertebrates from the South Saskatchewan River were more depleted in 34S than those from the North Saskatchewan River, with means of −5.1 ± 4.1‰ and −1.4 ± 2.8‰, respectively. In summer, corixid-feeing and noncorixid-feeding fish exhibited similar δ34S values in liver tissue, whereas in spring and autumn, corixid feeders exhibited more negative δ34S values. Isotope mixing models indicated that corixid-feeding species may have derived 34 to 65% of liver tissue from wetland sources in spring, 15 to 34% in summer, and 41 to 78% in autumn, whereas contributions to noncorixid-feeding species ranged from 4 to 17% across all seasons. We conclude that δ34S has the potential to trace insect movement and consumer use between isotopically distinct freshwater systems.","PeriodicalId":48926,"journal":{"name":"Freshwater Science","volume":"42 1","pages":"215 - 228"},"PeriodicalIF":1.8,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49046284","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":"Differentiating physical and biological storage of N along an intermittent Antarctic stream corridor","authors":"J. Singley, M. Salvatore, M. Gooseff, D. McKnight, Eve‐Lyn S. Hinckley","doi":"10.1086/725676","DOIUrl":"https://doi.org/10.1086/725676","url":null,"abstract":"In many temperate streams, biological uptake of N acts to attenuate the transport of excess N from allochthonous anthropogenic imports. Relatively few studies have determined how this N uptake relates to the magnitude of physical vs biological N storage in the stream corridor, especially for intermittent systems where allochthonous N imports are often low and N transport may only occur during brief periods of streamflow. Glacial meltwater streams in the McMurdo Dry Valleys of Antarctica provide an excellent setting to quantify autochthonous N-cycling and storage processes supported by abundant algal mats and well-connected hyporheic zones. We combined historic point-scale sediment and periphyton sample datasets with remote sensing-based modeling of periphyton coverage to estimate how much N was stored in periphyton biomass and the hyporheic zone of a 5-km long McMurdo Dry Valley stream corridor (>100,000 m2). We contextualized these N storage calculations by estimating the magnitude of annual N imports to and exports from the stream corridor based on >2 decades of streamflow and surface water data, source glacier ice cores and meltwater data, and past studies of local aeolian deposition and biological N fixation rates. We found that in this highly oligotrophic system, stream corridor-scale N storage was ∼1000× that of total annual N import or export fluxes. More than 90% of this temporarily stored N was autochthonous organic matter in the shallow (<10 cm) hyporheic zone, which acts as a reservoir that sustains N availability in the water column. Despite its location in a polar desert devoid of higher-order vegetation, area-normalized N storage (∼40 g N/m2) was greater than that reported for streams at lower latitudes (∼1–22 g N/m2). We also demonstrated that NH4+ sorption to stream sediment may be an important physicochemical N storage mechanism that responds to short-term fluctuations in streamflow and governs the mobility of inorganic N. Altogether, this research illustrates the importance of quantifying N storage within stream corridors when evaluating the significance of internal cycling and physical retention processes that modulate N availability.","PeriodicalId":48926,"journal":{"name":"Freshwater Science","volume":"42 1","pages":"229 - 246"},"PeriodicalIF":1.8,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42821054","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":"Morphological plasticity in a caddisfly that co-occurs in lakes and streams","authors":"Christine A. Parisek, M. P. Marchetti, M. Cover","doi":"10.1086/725455","DOIUrl":"https://doi.org/10.1086/725455","url":null,"abstract":"Lake and stream fauna are frequently studied, yet surprisingly little is known about ecological and evolutionary dynamics of species that inhabit both lentic and lotic habitats. There are few examples of species co-occurring in different flow types, which raises questions about how co-occurrence may influence ability to adapt to changing climatic conditions. One such co-occurring species is the aquatic insect Limnephilus externus Hagen, 1861 (Trichoptera:Limnephilidae), a species known to be widely distributed in lakes of the Nearctic and Palearctic regions. Here, we test whether lake–stream populations of the caddisfly L. externus are evolutionarily or ecologically distinct. We examined larval body and case morphology, interspecies phoretic associations, and the mitochondrial DNA cytochrome c oxidase I gene among lake and stream populations of L. externus. We also explored potential morphological differences among distinct haplotypes. We observed differences between lake and stream populations in abundance, phenology, some aspects of body and case morphology, and abdominal mite presence, indicating that lakes and streams may yield distinct ecological phenotypes for this species. We also observed distinct regional differences in caddisfly body condition and case construction sturdiness and found distinct assemblages of microinvertebrates associated with the caddisfly’s body and cases. Lake–stream L. externus did not show genetic divergence; however, 3 potentially distinct haplotypes were present across the research sites as well as in sequences from North America and Canada. Limnephilus externus appears to exhibit wide geographic range and low geographic sequence structure, which could account for the species’ large variation in phenology and morphology at the lake–stream level. Combined life history and phylogenetic studies provide valuable insight into the ecological and evolutionary dynamics that influence the adaptability of aquatic fauna to climatic change.","PeriodicalId":48926,"journal":{"name":"Freshwater Science","volume":"42 1","pages":"161 - 175"},"PeriodicalIF":1.8,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44425708","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":"Larval taxonomy of eastern Nearctic Polycentropus sensu stricto (Trichoptera: Polycentropodidae)","authors":"A. Orfinger, R. Hix, A. Rasmussen","doi":"10.1086/725339","DOIUrl":"https://doi.org/10.1086/725339","url":null,"abstract":"Although the alpha taxonomy of male caddisflies (Trichoptera) is largely well resolved in North America north of Mexico, significant work is needed to improve knowledge of larval stages. The genus Polycentropus Curtis, 1835 (Polycentropodidae) typifies this fact, with larval descriptions available for only 5/29 Nearctic species. The speciose eastern Nearctic fauna represents 22/29 Nearctic species and exemplifies a larger gap in larval taxonomy, with larval descriptions available for only 1/22 eastern Nearctic species. The inability to identify these larvae to species level precludes studies on these organisms’ biology and their inclusion in water-quality bioassessment protocols. Based on molecularly identified larvae, we describe the late- or final-instar larvae of an additional 11/22 eastern species and redescribe the larvae of Polycentropus centralis Banks, 1914. Species for which larvae are newly described are Polycentropus alabamensis Hamilton, Harris, and Lago, 1990; Polycentropus blicklei Ross and Yamamoto, 1965; Polycentropus carlsoni Morse, 1971; Polycentropus carolinensis Banks, 1905; Polycentropus confusus Hagen, 1861; Polycentropus elarus Ross, 1944; Polycentropus floridensis Lago and Harris, 1983; Polycentropus maculatus Banks, 1908; and Polycentropus pentus Ross, 1941 of the Polycentropus confusus Species Group as well as Polycentropus colei Ross, 1941 and Polycentropus rickeri Yamamoto, 1966 of the Polycentropus colei Species Group. A diagnostic matrix to assist in their identification is provided, and 1 new state record is reported. Future efforts should focus on associating and describing remaining unknown larvae and building upon the data and diagnostic tools provided herein.","PeriodicalId":48926,"journal":{"name":"Freshwater Science","volume":"42 1","pages":"176 - 189"},"PeriodicalIF":1.8,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48347765","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":"Winners and losers over a ½ century of change in crayfish assemblages of Wyoming, USA","authors":"Braxton Moran Newkirk, E. Larson, A. D. Walker, Annika W. Walters","doi":"10.1086/725318","DOIUrl":"https://doi.org/10.1086/725318","url":null,"abstract":"Crayfish have experienced extensive assemblage reorganization as a result of global change, with some species becoming globally invasive and others becoming rare or extinct. We combined historical and contemporary sampling data to determine temporal trends of crayfish assemblages of Wyoming, USA, identifying winners and losers over a ½ century of change (1969–2020). We first documented range expansions of several species, including the Virile Crayfish Faxonius virilis (Hagen, 1870), Ringed Crayfish Faxonius neglectus (Faxon, 1885), and Rusty Crayfish Faxonius rusticus (Girard, 1852) as well as range contractions of the Calico Crayfish Faxonius immunis (Hagen, 1870) and Pilose Crayfish Pacifastacus gambelii (Girard, 1852). We then used multispecies occupancy models to investigate potential mechanisms behind the replacement of F. immunis by F. virilis as the most commonly detected crayfish species in Wyoming over time. We hypothesized that F. virilis is more likely to competitively displace F. immunis from more permanent waterbodies, whereas F. immunis is more likely to persist in more ephemeral habitats because of its superior burrowing ability and tolerance of low dissolved oxygen concentrations. Our occupancy models supported this prediction, with F. immunis occupancy declining at more permanent sites in the presence of F. virilis, but F. immunis occupancy was unaffected by F. virilis in less permanent sites. We also found positive associations of F. virilis occupancy and detection probability with water temperature, suggesting that warmer streams may be more vulnerable to new invasions or spread by this species in nonnative regions of western North America. Our results highlight the value of regular, statewide crayfish surveys through documenting substantial changes in Wyoming’s crayfish assemblage structure that may be driven by habitat-mediated competitive interactions.","PeriodicalId":48926,"journal":{"name":"Freshwater Science","volume":"42 1","pages":"146 - 160"},"PeriodicalIF":1.8,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47218125","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":"Integrating the influence of untreated sewage into our understanding of the urban stream syndrome","authors":"P. Marques, A. Cunico","doi":"10.1086/724823","DOIUrl":"https://doi.org/10.1086/724823","url":null,"abstract":"The process of urbanization profoundly changes aquatic ecosystems. Urban streams often have flashier hydrology, increased nutrient and contaminant concentrations, and reduced biodiversity when compared with nonurban streams. Collectively, these characteristics are described as the urban stream syndrome (USS). The USS is traditionally attributed to the discharge of large volumes of stormwater into streams, thus pointing to stormwater as the primary driver of urban stream degradation. However, the USS was developed using evidence from studies in streams in high-income economies in the Global North, and the extent to which it applies to low- and mid-income countries in the Global South remains unclear. Urban expansion in the Global South is often not concomitant with the expansion of sanitation infrastructure, which can lead to large volumes of untreated sewage being discharged into urban streams. In this paper we explore the role of untreated sewage in the application of the USS concept in Latin America. First, we collected and quantified studies that consider the effect of untreated sewage on urban streams in Latin America. We then use the existing evidence to assess if untreated sewage has the potential to affect urban streams in Latin America in similar ways as stormwater affects urban streams in the Global North. Although untreated sewage pollution is widespread in Latin America, our search documented only 57 studies that consider the effects of untreated sewage in local streams. Despite the lack of empirical studies, it is likely that untreated sewage can be as important as stormwater in driving the USS in Latin America. We assert that to support effective management and conservation of urban streams in Latin America, untreated sewage pollution needs to be explicitly considered in the application of the USS concept.","PeriodicalId":48926,"journal":{"name":"Freshwater Science","volume":"42 1","pages":"195 - 203"},"PeriodicalIF":1.8,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44762205","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":"Benthic metabolism and nutrient uptake vary with geomorphology and season in a lowland river","authors":"Katrin Attermeyer, Christine Anlanger, Markus Weitere, Norbert Kamjunke, Mario Brauns","doi":"10.1086/723895","DOIUrl":"https://doi.org/10.1086/723895","url":null,"abstract":"Meandering rivers are characterized by geomorphic units like cut banks, point bars, and thalwegs. These units arise from interactions between hydrological and geomorphological forces. However, the individual contributions of geomorphic units to whole-river metabolism or nutrient processing are unclear because these quantifications are often done at larger spatial scales. We used closed recirculating chambers to measure benthic gross primary production (GPP), respiration (R), N uptake or release, and P uptake or release at bimonthly intervals over 1 y at different geomorphic units in the Mulde River, Germany. We compared GPP, R, and nutrient processing among a cut bank, a point bar, and the thalweg at a natural meander. We also compared the cut bank of this natural meander with a cut bank fixed by riprap at a human-altered meander. In the natural meander, GPP, R, and nutrient processing rates were higher at the point bar than the cut bank or thalweg. These differences are likely related to larger sediment grain sizes that provide a more stable substrate for microbial communities. A strong interaction between geomorphic units and time for GPP and NH4+ fluxes suggested that differences in nutrient processing rates among geomorphic units were restricted to specific times during the year. Specifically, we found that the nutrient processing rates differed among geomorphic units during the summer, but not winter. Furthermore, in June and August 2017, R was 2 to 3× lower at the cut bank stabilized by riprap than at the natural cut bank. Our results demonstrate that rivers are composed of functionally distinct geomorphic units susceptible to human-induced hydromorphological degradation. However, strong interactions between space and time and large within-geomorphic unit variability propose that local drivers influence ecosystem function, suggesting that we need additional research to resolve these drivers at the scales of geomorphic units.","PeriodicalId":48926,"journal":{"name":"Freshwater Science","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136173844","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":"Front Matter","authors":"","doi":"10.1086/725015","DOIUrl":"https://doi.org/10.1086/725015","url":null,"abstract":"Previous articleNext article FreeFront MatterPDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmail SectionsMoreDetailsFiguresReferencesCited by Freshwater Science Volume 42, Number 1March 2023 Published on behalf of the Society for Freshwater Science Article DOIhttps://doi.org/10.1086/725015 © 2023 The Society for Freshwater Science.PDF download Crossref reports no articles citing this article.","PeriodicalId":48926,"journal":{"name":"Freshwater Science","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135026347","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":"Macroinvertebrate biomonitoring in Latin America: Progress and challenges","authors":"A. Cortelezzi, L. Paz","doi":"10.1086/724732","DOIUrl":"https://doi.org/10.1086/724732","url":null,"abstract":"Macroinvertebrates are used as bioindicators worldwide, but the high diversity of macroinvertebrate species and endemism in Latin America (LA) requires greater knowledge of this group to increase the effectiveness of biomonitoring. We examined some of the primary taxonomic and ecological studies on macroinvertebrates in the region, quantified the number of papers that used foreign and local indices, examined alternative approaches to bioassessment that may be more relevant for the region, and explored freshwater ecosystem management in LA. Here, we highlight the need to increase taxonomic knowledge and the number of specialists in local fauna, establish and maintain taxonomic collections in public institutions, and make online databases on the biodiversity in each country available. However, we also demonstrate that taxonomy specialists of different nationalities do collaborate on the generation of fundamental information about biodiversity in LA. We found that 57% of the 215 reviewed scientific articles from LA used foreign but locally adapted indices for biomonitoring aquatic ecosystems. Only 21% of these articles presented local indices developed in LA. New technologies, such as environmental DNA, offer substantial potential for bioassessment but only in regions where sufficient taxonomic knowledge exists and where species-level stressor–response relationships are well described. In the absence of more complete taxonomic records, there could be some value in developing biological trait and multimetric indices, and occupancy models could be developed to analyze the relationship between taxa and stress factors. These tools could be adopted by researchers to generate more accurate biotic indices based on local taxa. Finally, in LA, bioindicators are used to support scientific research more often than as environmental monitoring tools. Environmental laws and regulations that support the biomonitoring of LA freshwaters and unified criteria for evaluating and monitoring aquatic ecosystems are essential to face regional and global challenges.","PeriodicalId":48926,"journal":{"name":"Freshwater Science","volume":"42 1","pages":"204 - 213"},"PeriodicalIF":1.8,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44939388","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":"Macroinvertebrate ecosystem engineering affects streambed retention of microplastics","authors":"Samuel F. Fritz, L. K. Albertson, John L. Hobgood, Elizabeth J. Mohr, Hayley C. Oakland, G. Poole","doi":"10.1086/724584","DOIUrl":"https://doi.org/10.1086/724584","url":null,"abstract":"Microplastic pollution of aquatic environments threatens human health, ecosystem processes, and biodiversity. Many existing models of microplastic movement in streams do not account for biotic effects on microplastic fate. Ecosystem engineering by net-spinning caddisflies (Hydropsychidae) has been shown to substantially affect sediment and organic matter transport as well as streambed hydrology. Caddisfly engineering may likewise affect the movement of microplastic pollution in streams. We used a controlled 11-d flume experiment to investigate the potential for caddisflies to serve as a biotic control on microplastic transport. Flumes containing a single gravel dune were randomly assigned to density treatments: control (0 caddisflies/m2) or stocked with 500, 800, or 2500 caddisflies/m2, incubated (d 1–10) to allow for caddisfly silk structure construction, inoculated (d 11) with PVC microplastics (333 µm–1 mm), and sampled (d 12). Microplastic was quantified as caught in a drift net (downstream transport), eaten by caddisflies (ingestion), or captured in caddisfly silk structures or settled into the gravel dune (i.e., total streambed retention). Mean downstream plastic transport was 9% lower than the control in the 800 caddisflies/m2 treatment (p < 0.001) and 10% lower in the 2500 caddisflies/m2 treatment (p = 0.003). Mean total streambed retention was 9% higher than the control in the 800 caddisflies/m2 treatment (p < 0.001) and 10% higher in the 2500 caddisflies/m2 treatment (p = 0.004). Ingestion of plastic by caddisflies was rare and highly variable (0–0.55% of plastic particles) but did increase with caddisfly density (p = 0.002). This work represents one of the first investigations of animal ecosystem engineering as a control on the movement and fate of microplastic particles in fresh waters and establishes a foundation for future research on biotic control of microplastic transport. Our results suggest that ecosystem engineering by net-spinning caddisflies may serve as a biotic control of microplastic transport in freshwater streams.","PeriodicalId":48926,"journal":{"name":"Freshwater Science","volume":"42 1","pages":"133 - 145"},"PeriodicalIF":1.8,"publicationDate":"2023-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48638223","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}