HR: 14:00h
AN: NB13F-03 INVITED     [Abstracts]
TI: Comparative life-history strategies of native and non-native fishes in the Colorado River Basin: Using species traits to understand rates of invasions and extirpations over the past century
AU: * Olden, J D
EM: olden@wisc.edu
AF: University of Wisconsin, Center for Limnology 680 Park Street N., Madison, WI 53706 United States
AU: Poff, N L
EM: poff@lamar.colostate.edu
AF: Colorado State University, Department of Biology, Fort Collins, CO 80523 United States
AU: Bestgen, K R
EM: kbestgen@cnr.colostate.edu
AF: Colorado State University, Department of Fishery and Wildlife Biology, Fort Collins, CO 80523 United States
AB: In this presentation we use a comprehensive database of morphological, behavioural, physiological and life-history traits for the native and non-native fish species pools of the Colorado River Basin to explore a number of hypotheses regarding linkages between human-induced environmental change, the creation of ecological niches opportunities, and invasion and extirpation of fish species over the past 150 years. Using the life-history model of Winemiller and Rose (1992), we quantitatively evaluate how rates of non-native species spread and range contraction of native species reflects the combined effects of similarities in life history strategies and a changing adaptive landscape caused by human environmental alteration. Our results revealed a number of intriguing findings. First, non-native species were located throughout the adaptive surface defined by the life-history attributes and surround the ecological niche volume represented by the native fish species pool. Second, native species exhibiting the highest similarity to the novel life-histories represented by non-native species have shown the greatest distributional declines. Third, non-native fishes exhibiting among the fastest rates of spread, in general, occupied "vacant" niche positions in life-history space that reflect "novel" anthropogenically-created environmental conditions (evidence for abiotic resistance) or showed the least similarity with native life-history strategies (evidence for biotic resistance).
DE: 9810 New fields (not classifiable under other headings)
SC: North American Benthological Society [NB]
MN: 2005 Joint Assembly