MEPS

Marine Ecology Progress Series

MEPS is a leading hybrid research journal on all aspects of marine, coastal and estuarine ecology. Priority is given to outstanding research that advances our ecological understanding.

Online: ISSN 1616-1599

Print: ISSN 0171-8630

DOI: https://doi.org/10.3354/meps

Volume contents
Mar Ecol Prog Ser 267:267-280 (2004)

Lunar cyclic population replenishment of a coral reef fish: shifting patterns following oceanic events

ABSTRACT: We examined the relationship between the pelagic environment and the lunar timing of reproduction and recruitment of a coral reef fish by comparing patterns exhibited by fish under normal oceanographic conditions with patterns exhibited by fishthat experienced significantly different pelagic conditions (i.e. encounter with meso-scale, low-salinity North Brazil Current [NBC] rings passing by the island of Barbados). We used a 20 mo time series of bluehead wrasse Thalassoma bifasciatumrecruitment, and compared larval growth and the timing of settlement and (successful) spawning recorded in the otoliths of individual recruits that encountered an NBC ring (RING fish) with those that did not (NO RING fish). Spawning occurred during alltimes of the lunar cycle, but during NO RING conditions, only those larvae spawned during the first-quarter moon were retained nearshore. Successful NO RING recruits were spawned during the first-quarter moon, grew rapidly as larvae, and settled duringthe third-quarter moon and neap tides. In contrast, during RING events, larvae spawned during all lunar phases were retained nearshore. Successful RING recruits were spawned over the entire lunar cycle, grew more slowly as larvae, and settled during bothquarter moons. Fish settling during the first-quarter moon were of higher condition than third-quarter-moon settlers, which is consistent with the concept of higher predation losses and selective mortality of settlers during less-than-optimum periods.Synchronized settlement patterns can be decoupled from spawning patterns by pelagic processes and flexible larval growth schedules. Variable pelagic conditions may contribute to the maintenance of daily reproduction and flexible growth histories in marinespecies.

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Su Sponaugle (Corresponding Author)
ssponaugle@rsmas.miami.edu

Deanna Pinkard (Co-author)