caa a22 4500 463167996 CHVBK 20180406164805.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s10530-006-9087-4 doi (NATIONALLICENCE)springer-10.1007/s10530-006-9087-4 Ground-truthing the impact of invasive species: spatio-temporal overlap between native least chub and introduced western mosquitofish [Elektronische Daten] [Jill Ayala, Russell Rader, Mark Belk, G. Schaalje] Western mosquitofish (Gambusia affinis) are one of the most destructive introduced species in the American West. The negative impact of introduced species on native taxa depends on their spatio-temporal overlap, which will determine the availability of refugia for native species. Experiments on the mechanisms underlying the interactions between introduced and native species rarely address habitat use, overlap, and refugia because individuals are confined to enclosures. In a previous study we used cages, microcosms, and aquaria to show that mosquitofish could prey on and out-compete native least chub (Iotichthys phlegethontis). In this study, we examined the spatio-temporal overlap between mosquitofish and least chub under natural conditions. We found periods of overlap and partitioning in the seasonal and diel habitat use of these species. Both species used shallow habitats during the day and night throughout the spring when least chub were spawning. Predation by adult mosquitofish on young least chub during the spring likely explains the reduction in least chub recruitment in the presence of mosquitofish. During the summer least chub avoided mosquitofish by exclusively using cooler habitats, or by occupying deeper, cooler habitats during the day when mosquitofish were active, and shallower, warmer habitats at night when mosquitofish were inactive. A shift to cooler habitats in the presence of mosquitofish may result in decreased growth and fecundity of least chub. However, we suggest that a reduction of warm shallow habitat may have a disproportionately greater negative impact on mosquitofish than species native to temperate regions, such as least chub. Habitat manipulations that reduce or eliminate warm habitats may ameliorate the harmful effects of mosquitofish and promote the long-term persistence of native taxa. Springer Science+Business Media, Inc., 2007 Invasive fish nationallicence Cyprinidae nationallicence Mosquitofish nationallicence Spatio-temporal overlap nationallicence Wetlands nationallicence Ayala Jill Department of Integrative Biology, Brigham Young University, 401 Widtsoe Building, 84602, Provo, UT, USA aut Rader Russell Department of Integrative Biology, Brigham Young University, 401 Widtsoe Building, 84602, Provo, UT, USA aut Belk Mark Department of Integrative Biology, Brigham Young University, 401 Widtsoe Building, 84602, Provo, UT, USA aut Schaalje G. Department of Statistics, Brigham Young University, 230 Talmage Building, 84602, Provo, UT, USA aut Biological Invasions Springer Netherlands 9/7(2007-10-01), 857-869 1387-3547 9:7<857 2007 9 10530 https://doi.org/10.1007/s10530-006-9087-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10530-006-9087-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ayala Jill Department of Integrative Biology, Brigham Young University, 401 Widtsoe Building, 84602, Provo, UT, USA aut NATIONALLICENCE 700 1- Rader Russell Department of Integrative Biology, Brigham Young University, 401 Widtsoe Building, 84602, Provo, UT, USA aut NATIONALLICENCE 700 1- Belk Mark Department of Integrative Biology, Brigham Young University, 401 Widtsoe Building, 84602, Provo, UT, USA aut NATIONALLICENCE 700 1- Schaalje G. Department of Statistics, Brigham Young University, 230 Talmage Building, 84602, Provo, UT, USA aut NATIONALLICENCE 773 0- Biological Invasions Springer Netherlands 9/7(2007-10-01), 857-869 1387-3547 9:7<857 2007 9 10530 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer