Settlement patterns and post-settlement survival in two Mediterranean littoral fishes: influences of early-life traits and environmental variables
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We examined the relationships between daily pattern of settlement and environmental parameters during two consecutive years in two littoral fishes, Lipophrys trigloides (Blenniidae) and Chromis chromis (Pomacentridae), in the NW Mediterranean Sea. We also used individual early-life traits (pelagic larval duration, size at hatching and size at settlement) calculated from otoliths, to study the proximate causes of settlement variability and size-selective mortality after settlement. Several early-life characteristics of L. trigloides (planktonic larval duration and size at hatching), and environmental variables averaged during the whole planktonic period (e.g. water temperature, wave height, solar radiation) were related with the magnitude of settlement. In contrast, C. chromis showed no significant relationships between early-life traits and the magnitude of settlement, and a weak relationship between settlement magnitude and environmental variables. Furthermore, juvenile survivors showed larger size at hatching than settlers, indicating that size at hatching affected the juvenile survival of the two species. These results suggest that survival was linked largely to conditions at hatching for both species.
KeywordsWave Height Settlement Pattern Wind Component Settlement Success Larval Duration
We specially thank A. García-Rubies, I. Uriz for helpful comments and F. Maynou for his valuable assistance in statistical analyses. Lastly we thank anonymous reviewers for their constructive remarks. This research was funded by project CICYT-MAR99–0873.
- Chambers RC, Leggett WC, Brown JA (1989) Egg size, female effects, and the correlations between early life history traits of capelin, Mallotus villosus: an appraisal at the individual level. Fish Bull 87:515–523Google Scholar
- Cushing DH (1996) Towards a science of recruitment in fish population. Excellence in Ecology, 7. Ecology Inst., Oldendorf/LuheGoogle Scholar
- Heath MR (1992) Field investigations of the early life stages of marine fish. Adv Mar Biol 28:2–174Google Scholar
- Macpherson E, Biagi F, Francour P, Garcia-Rubies A, Harmelin J, Harmelin-Vivien M, Jouvenel T, Planes S, Vigliola L, Tunesi L (1997) Mortality of juvenile fishes of the genus Diplodus in protected and unprotected areas in the western Mediterranean Sea. Mar Ecol Prog Ser 160:135–147CrossRefGoogle Scholar
- Mura MP, Agusti S, Cebrian J, Satta MP (1996) Seasonal variability of phytoplankton biomass and community composition in Blanes Bay (1992–1994). Publ Espec Inst Esp Oceanogr 22:23–29Google Scholar
- Searcy SS, Sponaugle S (2001) Selective mortality during the larval-juvenile transition in two coral reef-fishes. Ecology 82:2452–2470Google Scholar
- Sponaugle S, Cowen RK, Shanks A, Morgan SG, Leis JM, Pineda J, Boehlert GW, Kingsford MJ, Lindeman KC, Grimes C, Munro JL (2002) Predicting self-recruitment in marine populations: biophysical correlates and mechanisms. Bull Mar Sci 70(Suppl):341–375Google Scholar