scholarly journals Land cover, riparian zones and instream habitat influence stream fish assemblages in the eastern Amazon

2018 ◽  
Vol 28 (2) ◽  
pp. 317-329 ◽  
Author(s):  
Luciano F. A. Montag ◽  
Kirk O. Winemiller ◽  
Friedrich W. Keppeler ◽  
Híngara Leão ◽  
Naraiana L. Benone ◽  
...  
Keyword(s):  
Land Cover ◽  
Fish Assemblages ◽  
Riparian Zones ◽  
Stream Fish ◽  
Stream Fish Assemblages

scholarly journals Effects of deforestation on headwater stream fish assemblages in the Upper Xingu River Basin, Southeastern Amazonia

2019 ◽  
Vol 17 (1) ◽  
Author(s):  
Paulo Ilha ◽  
Sergio Rosso ◽  
Luis Schiesari
Keyword(s):  
Land Cover ◽  
River Basin ◽  
Fish Assemblages ◽  
Headwater Stream ◽  
Assemblage Structure ◽  
Stream Fish ◽  
Taxonomic Structure ◽  
Fish Assemblage Structure ◽  
Xingu River ◽  
Stream Fish Assemblages

ABSTRACT The expansion of the Amazonian agricultural frontier represents the most extensive land cover change in the world, detrimentally affecting stream ecosystems which collectively harbor the greatest diversity of freshwater fish on the planet. Our goal was to test the hypotheses that deforestation affects the abundance, richness, and taxonomic structure of headwater stream fish assemblages in the Upper Xingu River Basin, in Southeastern Amazonia. Standardized sampling surveys in replicated first order streams demonstrated that deforestation strongly influences fish assemblage structure. Deforested stream reaches had twice the fish abundance than reference stream reaches in primary forests. These differences in assemblage structure were largely driven by increases in the abundance of a handful of species, as no influence of deforestation on species richness was observed. Stream canopy cover was the strongest predictor of assemblage structure, possibly by a combination of direct and indirect effects on the provision of forest detritus, food resources, channel morphology, and micro-climate regulation. Given the dynamic nature of change in land cover and use in the region, this article is an important contribution to the understanding of the effects of deforestation on Amazonian stream fish, and their conservation.

Landscape influences on stream fish assemblages across spatial scales in a northern Great Plains ecoregion

2008 ◽  
Vol 65 (2) ◽  
pp. 245-257 ◽  
Author(s):  
Henry F Wilson ◽  
Marguerite A Xenopoulos
Keyword(s):  
Land Cover ◽  
Great Plains ◽  
Fish Species ◽  
Fish Assemblages ◽  
Spatial Scales ◽  
Species Assemblages ◽  
Northern Great Plains ◽  
Stream Fish ◽  
Stream Fish Assemblages ◽  
Nms Ordination

We examined the relationship between multiple spatial scales of fish assemblage structure and land cover in streams of a northern Great Plains ecoregion. We used regional richness measurements, an index of biotic integrity (IBI), and nonmetric multidimensional scaling (NMS) ordination to characterize fish assemblages. These metrics were related to regional catchment landscape at two spatial scales (overall catchment, overall riparian) and then to a set of local subcatchments from within these catchments at three scales (overall subcatchment, overall riparian buffer, and reach). Relationships between catchment fish richness, IBI scores, and landscape predictors were strongest at the riparian scale, with the strongest single predictor being riparian forest (r2 = 0.63, P < 0.01). NMS ordination analysis showed clear similarities between fish species assemblages in agriculturally dominated catchments and assemblages found in smaller headwater streams. At the same time, forested catchments and catchments with larger areas exhibited similar fish species assemblages. Our results indicate that both local and regional stream fish assemblages are structured by broader-scale landscape characteristics, with land cover providing a better indication of overall available habitat volume than catchment area or stream order.

Stream fish assemblages and basin land cover in a river network

2006 ◽  
Vol 365 (1-3) ◽  
pp. 140-153 ◽  
Author(s):  
Young-Seuk Park ◽  
Gaël Grenouillet ◽  
Benjamin Esperance ◽  
Sovan Lek
Keyword(s):  
Land Cover ◽  
Fish Assemblages ◽  
River Network ◽  
Stream Fish ◽  
Stream Fish Assemblages

Fluctuation and variation in stream-fish assemblages after a catastrophic flood in the Miyagawa River, Japan

2011 ◽  
Vol 92 (4) ◽  
pp. 447-460 ◽  
Author(s):  
Yuichi Kano ◽  
Kaori Ohnishi ◽  
Yasuo Tomida ◽  
Naoyo Ikeda ◽  
Naomi Iwawaki ◽  
...  
Keyword(s):  
Fish Assemblages ◽  
Stream Fish ◽  
Catastrophic Flood ◽  
Stream Fish Assemblages

Diversity and stability in Mississippi stream fish assemblages

2012 ◽  
Vol 31 (3) ◽  
pp. 882-894 ◽  
Author(s):  
Jacob F. Schaefer ◽  
Scott R. Clark ◽  
Melvin L. Warren
Keyword(s):  
Fish Assemblages ◽  
Stream Fish ◽  
Stream Fish Assemblages

Advances in Understanding Landscape Influences on Freshwater Habitats and Biological Assemblages

2019 ◽  
Keyword(s):  
Land Use ◽  
Fish Assemblage ◽  
Fish Assemblages ◽  
Urban Land ◽  
Urban Land Use ◽  
Stream Fish ◽  
Landscape Variables ◽  
Stream Fish Assemblages ◽  
Anthropogenic Land Use ◽  
Assemblage Metrics

<i>Abstract.</i>—Anthropogenic activities including urbanization, agriculture, and dams degrade stream habitats and are a dominant reason for global biodiversity declines in fluvial fish assemblages. Declining diversity trends have been well documented in many regions of the world; however, fishes vary regionally in response to anthropogenic land use, resulting from complex relationships between landscape variables and mechanisms controlling stream fish assemblages. To test for differences in regional fish response to anthropogenic land use, we conducted our study across five freshwater ecoregions in the temperate mesic portion of the United States and evaluated data characterizing stream fish assemblages from 10,522 locations across all study freshwater ecoregions. Fishes were summarized by metrics describing assemblage structure, trophic groupings of species, levels of tolerance to anthropogenic stressors, and life history characteristics, with seven metrics used for analyses. Natural and anthropogenic landscape variables were assessed across freshwater ecoregions, and we tested for regionally specific influences of percent catchment urbanization, percent catchment agriculture, and catchment densities of dams and stream-road crossings on stream fishes. We used cascade multivariate regression trees to quantify variance explained in fish metrics by these landscape variables after controlling for influences of natural landscape variables, including catchment area, catchment lithology, and elevation of study sites. Results indicated differences in dominant influences by freshwater ecoregion, as well as differences in the levels of anthropogenic land use influencing fishes within and across freshwater ecoregions. For example, urban land use was the most influential anthropogenic land use in both Appalachian Piedmont and Chesapeake Bay freshwater ecoregions, with fish assemblage metrics showing responses at 10% and 1% catchment urban land use, respectively. In contrast, dam density in the network catchment was the most influential anthropogenic variable on fish assemblage metrics in both the Laurentian Great Lakes and Middle Missouri freshwater ecoregions. Also, large amounts of agriculture in the catchment was the most influential anthropogenic land use on fish assemblage metrics in the Upper Mississippi freshwater ecoregion. Knowledge of regional differences in the top contributing anthropogenic landscape variables and the levels at which fish assemblages respond to these variables lends insight into mechanisms controlling stream fish assemblages by freshwater ecoregions and can aid in development of region-specific conservation strategies to prevent biodiversity loss from current and future anthropogenic land use.

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