Behavioral Ecology of Coral Reef Fishes at Spawning Aggregation Sites
Massachusetts Institute of Technology, Woods Hole Oceanographic Institution, Joint Program in Oceanography/Applied Ocean Science and Engineering, 1998 - Coral reef fishes - 254 pages
"This thesis is an extensive investigation of the behavioral and ecological relationships between spawning reef fishes, their predators, and various environmental parameters at spawning aggregation sites. Underwater observations of spawning activities by eleven reef fish species and the hunting behaviors of both piscivorous and planktivorous predators were made at Johnston Atoll (Central Pacific). The spawning of reef fishes was typically correlated with local changes in current direction and predatory risks in daytime-spawning species, showing responses designed to reduce the mortality of propagules and adults. Dusk-spawning species generally did not respond to changes in flow direction or predator abundance. Piscivores were most active at spawning sites during the daytime hours, when spawning prey fish were most abundant, but showed low activity at dusk, the period of highest prey diversity. Alternate hunting behaviors (midwater or ambush attacks) were used by piscivores when feeding on spawning fishes, and resulted in different capture success rates. The difference in heights of spawning ascents by two trunkfish species was interpreted to be the result of intraspecific competition among males, and could not be explained by interspecific differences in susceptibility to predation, estimated as a function' of the specific toxicity of both species. ."--Stinet.
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18S rDNA AAAaaa aaraa abundance Acanthurus nigroris Actiniaria activity patterns Alcyonacea analyses Anthozoa Antipatharia Aphareus furca Biol Carangidae Caranx melampygus Ceriantharia Chlorurus sordidus clade Colin coral reef coral reef fishes correlated CT melampygus CT sordidus Ctenochaetus strigosus current speed current velocity daytime Dendrobrachia dusk ecology eggs environmental evolutionary feeding Figure gametes group-spawning species Helioporacea Hexacorallia Hixon hypotheses indicate Johannes Johnston Atoll Lobel locations male molecular morphological Moyer Mustin's Gap number of spawns o o o occurred Octocorallia octocorals Ostracion meleagris Ostracion whitleyi outflowing currents pair-spawning Pennatulacea phylogenetic piscivores planktivorous predation risks predator-prey prey species propagules rates Reef Edge reef fishesT reproductive Robertson sampling Scleractinia selected sequence spawners spawning activities spawning aggregation spawning ascents spawning behavior spawning fishes spawning grounds spawning intensity spawning patterns spawning rushes spawning species speciesT specimens substrate Thresher tidal tides toxic triggerfishes trunkfish variables water column whitleyi