Journal article
Fish assemblages on two continents respond to valley- and reach-scale hydrogeomorphic variation: Analyses across three temperate ecoregions
Ecology of freshwater fish, v 34(1), 12806
01 Jan 2025
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Fish assemblages, defined by taxonomy or functional traits, -respond to regional and local habitat variation. Our hypothesis was that fish assemblages could be best predicted using reach-scale (RS) hydrology variables over valley-scale (VS) hydrogeomorphology variables for US and Mongolian rivers. We further predicted that fish traits were predicted better by RS than VS variables. We evaluated the FS and VS hydrogeomorphologies of rivers in the United States and Mongolia in each of three ecoregions: grassland, forest and endorheic. Fishes were collected using a backpack electrofisher, following standard protocols. Constrained ordination analyses were conducted at three scales: among continents, by continents and by individual ecoregions within continents. We found no significant difference in mean variation explained by VS versus RS or by taxonomy versus traits. Ecoregions differed in factors contributing to fish assemblage patterns, likely a result of differences in hydrogeomorphology, hydrological connectivity and historical influences. We found that fish assemblages were structured by hydrogeomorphic processes occurring at VS and RS, and that variables predicting fish assemblages varied with scale and whether fishes were classified by taxonomy or traits. Although anthropogenic impacts were substantially higher for western US rivers than for Mongolian rivers, we were unable to detect strong differences in our ability to predict fish assemblage variation from RS and VS habitat variables.
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Details
- Title
- Fish assemblages on two continents respond to valley- and reach-scale hydrogeomorphic variation: Analyses across three temperate ecoregions
- Creators
- Mark Pyron (Corresponding Author) - Ball State UniversityAlain Maasri - Leibniz Institute of Freshwater Ecology and Inland FisheriesJohn Costello - South Dakota School of Mines and TechnologyScott Kenner - South Dakota School of Mines and TechnologyAmarbat Otgonganbat - National University of MongoliaBud Mendsaikhan - Mongolian Academy of SciencesSudeep Chandra - University of Nevada, RenoJames H. Thorp - University of KansasEmily R. Arsenault - State University of New YorkRobert Shields - Ball State UniversityCaleb Artz - Ball State UniversityMario Minder - Ball State University
- Publication Details
- Ecology of freshwater fish, v 34(1), 12806
- Publisher
- Wiley
- Number of pages
- 12
- Grant note
- 126193 / Academy of Finland (AKA); Research Council of Finland 1442595; 126193 / National Science Foundation; National Science Foundation (NSF) NSF Macrosystem Biology
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Academy of Natural Sciences of Drexel University
- Web of Science ID
- WOS:001251535900001
- Scopus ID
- 2-s2.0-85196612799
- Other Identifier
- 991022197420604721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Fisheries
- Marine & Freshwater Biology