Archiv Fur Hydrobiologie最新文献

{"title":"Influence of fine sediments on meiofauna colonization densities in artificial stream channels","authors":"A. J. Radwell, Arthur V. Brown","doi":"10.1127/0003-9136/2006/0165-0063","DOIUrl":"https://doi.org/10.1127/0003-9136/2006/0165-0063","url":null,"abstract":"Excessive fine sediments have been shown to adversely affect abundance and diversity of stream macroinvertebrates, but effects on meiofauna have been only minimally and indirectly assessed. We used 12 artificial channels in a 4 th order Ozark stream to investigate the influence of silt (particle diameter 63 μm to 2 mm) and gravel (particle diameter 2 to 16 mm) on meiofauna colonization. Four channels were filled with gravel, four with 1/2 gravel and 1/2 sand, and four with 1/3 gravel, 1/3 sand, and 1/3 topsoil, referred to as gravel, sand, and silt treatments, respectively. Substrate cores were taken from the natural and artificial channels for analysis of meiofauna (80 μm to 1 mm) and substrate composition. Rotifera, Copepoda, Chironomidae, Nematoda, Oligochaeta, and Mollusca (principally juvenile Corbicula fluminea) comprised the major meiofauna taxa. Total meiofauna density in the artificial channels differed significantly among treatments. Density was lower in the silt treatment than in gravel or sand treatments, but overall densities in the gravel and sand treatments did not differ. Responses to treatments varied among specific taxa; densities of rotifers, copepods, nematodes, and oligochaetes were lower in the silt than the gravel treatment, but chironomids and nematodes were equally abundant in gravel and sand treatments, while lower in the silt treatment. Total meiofauna density did not differ between the natural channel and the gravel treatment but was lower in the sand and silt treatments. Copepod density was higher in the gravel treatment, and nematode, oligochaete, and mollusk densities were lower for all three treatments compared to the natural channel. The lower density of total meiofauna associated with high concentrations of silt suggests that excessive silt reduces habitat space and/or quality for meiobenthic organisms, while a sand and gravel mix is suitable for some meiofauna taxa.","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"98 1","pages":"63-75"},"PeriodicalIF":0.0,"publicationDate":"2006-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74168292","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}

{"title":"Migrations of soufie (Leuciscus souffia agassizii, VAL. 1844) in a natural river and a tributary determined by mark-recapture","authors":"Hendrik Wocher, R. Rösch","doi":"10.1127/0003-9136/2006/0165-0077","DOIUrl":"https://doi.org/10.1127/0003-9136/2006/0165-0077","url":null,"abstract":"From April to October 1998, soufie (Leuciscus souffia agassizii, VAL. 1844) were fished monthly using electrofishing at four sampling sites in the Argen River and in a little tributary. All fish with a body size exceeding 8 cm were tagged individually using micro tags. Additionally the fish were tagged according to sampling site by jet injection using Alcian Blue dye. The main part of the soufie population exhibited a migratory behaviour during the year between winter and summer habitat. Most of the soufie overwintered in a pool of a little tributary of the river, whereas age 0 + soufie remained in the river for the whole year. After spawning in spring in the river, the fish segregated during summer for feeding in the main river system. In the autumn, the fish returned to their winter habitat. It is concluded that the tributary plays an important role as overwintering habitat for the soufie population (except 0 +) of the investigated river section.","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"35 1","pages":"77-87"},"PeriodicalIF":0.0,"publicationDate":"2006-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81693474","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}

{"title":"Development and experimental assessment of an underwater video technique for assessing fish-habitat relationships","authors":"T. Pratt, K. Smokorowski, J. Muirhead","doi":"10.1127/0003-9136/2005/0164-0547","DOIUrl":"https://doi.org/10.1127/0003-9136/2005/0164-0547","url":null,"abstract":"Developing tools that aquatic managers can use to understand the impact of human development on fish habitat is important in an era where our aquatic resources are under increasing pressure. To this end, we examined whether an underwater video camera was useful for quantifying fish habitat use in inland lakes by 1) examining patterns in fish habitat use, residency time and feeding behaviour among habitat types, 2) determining the precision and statistical power of the aforementioned estimates, and 3) assessing whether our habitat-specific camera estimates were reflective of whole-system estimates. Lastly, we used our protocol in an experimental situation to test site-specific fish habitat use at sites where habitats were manipulated (removed or added). We demonstrated that our underwater video protocol could successfully capture site-level habitat use that corresponded with whole-system abundance estimates, addressing the concern that habitat-based surrogates of fish productivity be validated on a whole-system scale. Unfortunately, our underwater video technique was unable to discriminate fish habitat use patterns among simple habitat types and unable to consistently separate differences in among-habitat fish feeding and residency behaviours. Our ability to detect a difference was low in all among-habitat comparisons. In the aquatic systems where habitat was added, we documented a significant shift in fish habitat use towards the addition sites and away from control sites, but no corresponding increase in system-wide fish biomass or production; no changes were apparent in the habitat removal lakes. A combination of longer filming duration, more filming sites or changing to a mobile transect method would likely address the data deficiencies that limited our ability to make site-level inferences about fish habitat use.","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"48 1","pages":"547-571"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79453239","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}

{"title":"The use of chironomid pupal exuviae in river biomonitoring : the importance of sampling strategy","authors":"J. Raunio, T. Muotka","doi":"10.1127/0003-9136/2005/0164-0529","DOIUrl":"https://doi.org/10.1127/0003-9136/2005/0164-0529","url":null,"abstract":"Due to the seasonal variation in the emergence patterns of chironomid taxa, a combination of three monthly samples from spring to autumn has been recommended for biomonitoring of rivers using the Chironomid Pupal Exuvial Technique (CPET). The main purposes of this study were to establish an effective sampling strategy (i. e. strategy that would allow effective discrimination between study sites) for biomonitoring of boreal rivers using the CPET methodology and to estimate the taxonomic coverage of any three monthly sample combinations. First, we collected pupal exuvial samples from three oligo- to mesotrophic study sites in a large boreal River Kymi, southern Finland, in 4-week intervals from the beginning of May to September 2003. The four most effective combinations of three monthly samples resulted in a significant difference between the sites, while the six least powerful combinations indicated no differences in chironomid communities between the sites. A corresponding data set was collected from four oligo- to eutrophic rivers, one sampling site representing each river. In this data set, eight combinations out of ten found significant differences between the rivers. Thus, the sampling strategy seemed more decisive at the within vs. among-river scale of comparison. No single combination of three monthly samples was consistently the most effective one in discriminating among the studied sites and rivers. Nevertheless, a combination of CPET samples from different seasons (i. e. spring, mid-summer and late summer/autumn) clearly constitutes the best sampling strategy for the detection of environmental impacts in boreal rivers. In the studied rivers, and probably in other boreal rivers as well, any combination of three monthly samples from spring to autumn will yield a reasonably high coverage of the available genera (at least 60%). We suggest that the efficiency of different sample combinations and the distribution of the emergence periods of locally abundant intolerant taxa are crucial information when the CPET methodology is used for river biomonitoring.","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"1 1","pages":"529-545"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84658917","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}

{"title":"Neuston: Its definition with a historical review regarding its concept and community structure","authors":"H. Marshall, L. Burchardt","doi":"10.1127/0003-9136/2005/0164-0429","DOIUrl":"https://doi.org/10.1127/0003-9136/2005/0164-0429","url":null,"abstract":"Since NAUMANN (1917) introduced the term neuston, various criteria and descriptions have been used to identify the habitat and its populations. Dissimilar methods of collection protocols have contributed to these different interpretations. To more fully identify the restricted ecological niche occupied by this unique community, papers from the original and more recent freshwater and marine neuston studies are discussed along with the common sampling methods for neuston. Characteristics of the neuston habitat are also presented, with definitions for neuston, epineuston, and hyponeuston. Attachment to the surface layer by its floral or faunal populations is not considered a requirement, and the neuston community includes organisms that move directly on or below the water surface. The depth of the neuston (hyponeuston) community below the water's surface can be determined by noting statistically significant changes within the populations with increasing depth below the surface layer. This depth would be expected to change diurnally and seasonally, and also to differ between freshwater and marine habitats. The horizontal patchiness of the neuston should also be anticipated and resolved through an adequate sampling protocol.","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"49 1","pages":"429-448"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79516628","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}

{"title":"Effects of nutrient enrichment on algal biomass across a natural light gradient","authors":"W. K. Taulbee, S. D. Cooper, J. Melack","doi":"10.1127/0003-9136/2005/0164-0449","DOIUrl":"https://doi.org/10.1127/0003-9136/2005/0164-0449","url":null,"abstract":"Algae are limited by light and nutrients, and the combined effects of light and nutrients on algae are often more important than their independent effects. To investigate the interactive effects of light and nutrients on benthic algae, we measured the effects of nutrient enrichment on chlorophyll-a concentrations across a natural light gradient in a Sierra Nevada subalpine stream using nutrient diffusing substrata (NDS) bioassays during the summer of 1999. Algal chlorophylla concentrations were nitrogen limited across the entire light gradient. Chlorophyll-a concentrations increased with increasing light levels for algae growing on substrata to which nitrogen was added, whereas chlorophyll-a concentrations decreased with increasing light levels for algae growing on substrata receiving phosphorus or no nutrient additions. These results demonstrate that for essential resources such as light and nutrients, the magnitude of the response to enrichment by one resource depends on the relative availability of the other resource.","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"2 1","pages":"449-464"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90488313","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}

{"title":"Ontogenetic changes in vertical distribution of an endemic amphipod, Jesogammarus annandalei, in Lake Biwa, Japan","authors":"T. Ishikawa, J. Urabe","doi":"10.1127/0003-9136/2005/0164-0465","DOIUrl":"https://doi.org/10.1127/0003-9136/2005/0164-0465","url":null,"abstract":"We examined the seasonal variation in vertical distribution, gut fullness and diet of Jesogammarus annandalei, an endemic amphipod in Lake Biwa. The vertical distribution changed ontogenetically throughout the year and was restricted to depths with a water temperature < 12 °C. Newborn amphipods remained in the pelagic zone throughout the day while larger amphipods exhibited marked diurnal vertical migrations: individuals stayed on the lake bottom during the day and ascended to the pelagic zone at night. Gut fullness and contents of the migrating amphipods indicated that they fed upon plankton in the pelagic zone at night. Our results indicate that these migration patterns probably reduce the amphipod's predation risk from fish. As a result, J. annandalei may play an important role in the vertical translocation of material and energy in the Lake Biwa ecosystem.","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"165 1","pages":"465-478"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75638083","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}

{"title":"The role of the environment in the distribution and composition of Trichoptera assemblages in streams","authors":"M. Feio, R. Vieira-Lanero, Verónica Ferreira, M. Graça","doi":"10.1127/0003-9136/2005/0164-0493","DOIUrl":"https://doi.org/10.1127/0003-9136/2005/0164-0493","url":null,"abstract":"We investigated how diversity and distribution of more than 11000 Trichop- tera larvae in streams of central Portugal were related to chemical and physical envi- ronmental variables. Sixty-six sites were sampled in 2001, by kicknet, in 55 streams of the Mondego River basin, the largest entirely Portuguese river. Simultaneously 43 environmental variables were evaluated for each site. We identified 18 families and 70 species and genera of caddisflies, representing ≈ 20 % of all trichopteran taxa recorded for the Iberian Peninsula. The species Calamoceras marsupus, Cheumatopsyche lepida, Hydropsyche bulbifera, Hydropsyche siltalai, Hydroptila sp., Lepidostoma hir- tum, Mystacides azurea, Chimarra marginata, Polycentropus flavomaculatus, Tinodes waeneri, Rhyacophila adjuncta and Sericostoma sp. were found to be the most impor- tant taxa in the Mondego River basin. Stream order, substrate quality, altitude, current velocity and alkalinity explained 41 % of the taxa distribution suggesting that at a wi- der (catchment) scale physical and hydrological parameters are more important for the distribution of Trichoptera assemblages than chemical parameters. Six significantly different groups of sites with similar Trichoptera assemblages were identified in the catchment and related to altitudinal, hydrological and substrate gradients. Our findings allow us to predict Trichoptera assemblages in streams of the Mondego catchment based on few environmental characteristics.","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"59 1","pages":"493-512"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87056103","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}

{"title":"Effects of taxonomic and numeric resolution on the ability to detect ecological patterns at a local scale using stream macroinvertebrates","authors":"A. S. Melo","doi":"10.1127/0003-9136/2005/0164-0309","DOIUrl":"https://doi.org/10.1127/0003-9136/2005/0164-0309","url":null,"abstract":"With 3 figures and 3 tables Abstract: The increasing demand for methods of rapid stream bioassessment has stim- ulated the evaluation of data simplification. In particular, these studies have assessed how much power is lost when species/morphospecies identification is replaced by family identifications or use of EPT (Ephemeroptera, Plecoptera and Trichoptera) taxa only. A second simplifying factor commonly evaluated is the use of presence/absence data instead of density. These simplifications have provided valid results in most cases where differences among groups are large, particularly in studies comparing impacted vs. non-impacted stream sites and ecological studies involving large spatial scales. Here I evaluate whether data simplification, both in terms of taxonomic (families, mor- phospecies of EPT) and numeric (presence/absence) resolutions, is valid for ecological studies done at local scales, where differences among groups are subtle. Datasets used are derived from a five-year study of five stream sites situated in a catchment in south- east Brazil. Streams were sampled twice a year, in the rainy (summer) and dry (winter) seasons. I used Analysis of Similarity (ANOSIM) to evaluate if differences i) among stream sites and ii) between seasons within a stream site, revealed by using the full data set (morphospecies, quantitative data), were also detected when using the sim- plified datasets. The effect of taxonomic resolution was not significant; the two sim- plified levels of this factor (morphospecies of EPT, families) were able to recover the same groups revealed by the full dataset. However, the use of presence/absence data had a strong negative effect on the ability to distinguish groups, particularly when dif- ferences were small (between seasons within a stream site). The success in recovering groups using simplified taxonomic data agrees with previous evaluations done using datasets from applied fields and those from ecological studies involving large spatial scales. However, in contrast to results observed in applied and large-scale studies, use of simplified data quantification in local datasets resulted in significant loss of infor-","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"83 1","pages":"309-323"},"PeriodicalIF":0.0,"publicationDate":"2005-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82597812","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}

{"title":"Oscillation of a shallow lake ecosystem upon reduction in external phosphorus load","authors":"W. Rip, M. Ouboter, B. Beltman, E. H. Nes","doi":"10.1127/0003-9136/2005/0164-0387","DOIUrl":"https://doi.org/10.1127/0003-9136/2005/0164-0387","url":null,"abstract":"A long-term study of eutrophication abatement in the Botshol Nature Reserve, the Netherlands, showed an intriguing response in this shallow lake. Beginning in 1988, the external nutrient load was reduced by hydrological segregation from agricultural areas and by chemical stripping of phosphorus from the water supply. A side effect of the hydrological segregation of Botshol from agricultural areas was an increase in chloride from 500 to 1000 mg l -1. In the first four years after the decrease in nutrient load, reductions were observed in phosphorus and chlorophyll a concentrations, as well as in the density of phytoplankton, zooplankton, and fish. Reduced phytoplankton density resulted in reduced turbidity and increased cover of Characeae from 2 to 80 %. Although the objective of re-establishing submerged macrophytes seemed to be attained, the clear water state appeared unstable. From 1993 onwards, the ecosystem alternated between turbid water with minor macrophyte production (1993-1995, 1999-2003) and clear water with abundant growth of aquatic plants (1996-1998). Phosphorus concentrations in Botshol also showed strong related fluctuations, despite a stable external phosphorus load.","PeriodicalId":8118,"journal":{"name":"Archiv Fur Hydrobiologie","volume":"37 1","pages":"387-409"},"PeriodicalIF":0.0,"publicationDate":"2005-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77201468","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}