Effects of Small Green Sunfish (Lepomis cyanellus) on Recruitment of Gila Chub (Gila intermedia) in Sabino Creek, Arizona
2000; Southwestern Association of Naturalists; Volume: 45; Issue: 1 Linguagem: Inglês
10.2307/3672548
ISSN1943-6262
AutoresRobert K. Dudley, William J. Matter,
Tópico(s)Fish Biology and Ecology Studies
ResumoYoung-of-year Gila chub (Gila intermedia) were abundant in upstream reaches of Sabino Creek, Arizona, devoid of green sunfish (Lepomis cyanellus), but were absent in downstream areas occupied by green sunfish. We examined potential reasons for this pattern by studying piscivory and habitat use of small green sunfish ( 150 mm TL) green sunfish. However, even small green sunfish were highly predacious on young-of-year Gila chub, and our habitat study demonstrated that both taxa occupied similar mesohabitats. Co-oc- currence of Gila chub and green sunfish in Sabino Creek seems to be the result of periodic downstream movement of adult Gila chub from reaches devoid of green sunfish. Young life stages of Gila chub apparently do not persist in sections of Sabino Creek occupied by green sunfish. RESUMEN-Juveniles del afio de charalito de Gila (Gila intermedia) abundaban rio arriba de Sabino Creek, Arizona, carente de robalo verde (Lepomis cyanellus), pero no estaba rio abajo en
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