Spatial Habitat Dynamics Affecting Bluegill Abundance in Minnesota Bass–Panfish Lakes

Autor:	Timothy K. Cross, Michael C. McInerny
Rok vydání:	2005
Předmět:	food.ingredient Geographic information system Ecology Watershed area business.industry Edaphic Land cover Management Monitoring Policy and Law Aquatic Science Bass (fish) food Geography Habitat Abundance (ecology) Fisheries management business Ecology Evolution Behavior and Systematics
Zdroj:	North American Journal of Fisheries Management. 25:1051-1066
ISSN:	1548-8675 0275-5947
Popis:	A holistic approach to fisheries management requires an understanding of factors related to fish abundance over several spatial scales. We used geographic information systems to extract data describing habitat influences across three different spatial scales for a selected ecological class of Minnesota bass–panfish lakes (n = 113). These data were then analyzed by regression tree analysis to describe relationships between habitat and trap-net catch per effort (CPE) of bluegills Lepomis macrochirus. At the landscape scale of analysis, bluegill CPE increased among lakes with decreases in hydrologic connectivity (landscape position) and increases in geographic northing and easting gradients that corresponded to regional differences in geomorphology and edaphic characteristics. At the watershed–lake scale of analysis, a regression tree model with variables describing watershed area, cultivated land cover, forested land cover, and lake area explained 55% of the variation in bluegill CPE among lakes. A...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2d2d16b03aeeb372c1ecbcb01c67b628 https://doi.org/10.1577/m04-072.1 Zobrazit plný text záznamu Plný text