Fecundity and the Dynamics of Multiple Spawning in Darters: An In-Stream Study of Etheostoma rafinesquei
作者： Gordon K. Weddle , Brooks M. Burr
DOI: 10.2307/1446591
关键词: Carbon isotope excursion 、 Etheostoma rafinesquei 、 Snubnose darter 、 Fecundity 、 Reproductive cycle 、 Stream temperature 、 Zoology 、 Ecology 、 Vitellogenesis 、 Biology
摘要: We determined the annual fecundity and spawning periodicity of Kentucky snubnose darter, Etheostoma rafinesquei, by collecting all ova spawned individual females during 26-42 d in-stream confinement. Fecundity estimates based on were comparable with those counts mature follicles in wild-caught females. Each 15 females, captive for 12 or more days, multiple clutches. Spawning clutches was related to group synchronous cycles oocyte development. Vitellogenic recruited from nonvitellogenic oocytes season. Batch not equivalent daily spawns caged successive days observed frequently; a batch (clutch) protracted. directly correlated stream temperature at temperatures below 21.5 C but exceeding C. negatively influenced high discharge excess ca C, apparent thermal maximum. Females darter 500-1000 1988
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