<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Robinson, C. L. K.</style></author><author><style face="normal" font="default" size="100%">Tonn, W. M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Influence of environmental factors and piscivory in structuring fish assemblages of small Alberta lakes</style></title></titles><dates><year><style  face="normal" font="default" size="100%">1989</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://search.proquest.com/docview/303587250</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">Canadian Journal of Fisheries and Aquatic Sciences</style></publisher><volume><style face="normal" font="default" size="100%">46</style></volume><pages><style face="normal" font="default" size="100%">81-89</style></pages><language><style face="normal" font="default" size="100%">en</style></language><abstract><style face="normal" font="default" size="100%">We surveyed 45 small lakes in central Alberta to determine if discrete, repeatable types of fish assemblages exist, to identify the main environmental and biotic processes likely responsible for assemblage-level patterns, and to compare and contrast Alberta patterns with those observed in other regions of North America. Overall, 11 species of fish were caught in 36 lakes; nine lakes were fishless. Hierarchical classification and detrended correspondence analysis of fish species presence/absence identified two main assemblage types, characterized by northern pike (Esox lucius) and yellow perch (Perca flavescens) versus brook stickleback (Culaea inconstans) and fathead minnow (Pimephales promelas). Pike/perch lakes were significantly deeper and larger than lakes of the stickleback/fathead assemblage type; however, a subset of the former group lacking yellow perch was environmentally similar to stickleback/fathead lakes. Piscivory by northern pike appears to be the dominant process maintaining nearly complete negative associations between members of the two assemblage types. Despite environmental and faunal-richness differences, our results were not unlike those from southern Ontario and northern Wisconsin. For small boreal lakes of North America, piscivory and processes related to a small number of environmental variables, such as maximum depth, surface area, and isolation, appear to be most important in structuring fish assemblages.</style></abstract><custom1><style face="normal" font="default" size="100%">Biology</style></custom1><custom2><style face="normal" font="default" size="100%">Athabasca River Basin, upper half</style></custom2><custom4><style face="normal" font="default" size="100%">Science</style></custom4><research-notes><style face="normal" font="default" size="100%">This article can also be found at: 
http://article.pubs.nrc-cnrc.gc.ca/RPAS/RPViewDoc_handler_=HandleInitialGet&amp;calyLang=eng&amp;journal=cjfas&amp;volume=46&amp;articleFile=f89-012.pdf</style></research-notes></record></records></xml>