Rabu, 12 November 2008

Reef fish seminar

I would like to announce the following invited research seminar by Dr Michel Kulbicki of the University of Perpignan. The seminar will be presented in the main Auditorium of the Marine Science Institute Research Building on Tuesday, November 25th from 4-5PM and is sponsored by the Moorea Coral Reef LTER site.

Michel Kulbicki is based at the Insitut de Recherche pour le Développement in Perpignan, France. He was originally trained in biology and fish ecology at the Institut National d'Agronomie de Paris and Oregon State University. After four years of work on tuna fisheries and echointegration, he came to reef fish ecology in 1985. He was then based in New Caledonia where he worked until 2004. During his stay there, he had the opportunity to conduct fieldwork in New Caledonia, French Polynesia, Tonga and Fiji. His major interests lie in linking the characteristics of reef fish assemblages (e.g. species composition, functional groups, trophic or size structure) to factors at various spatial scales, from local (reef type, fishing pressure, coral cover) to regional (island size, island type, degree of isolation). He is also interested in developing better methods to survey reef fish and in associating information on fish obtained via underwater visual censuses with information on the environment obtained via remote sensing.

Seminar Title: Macro-ecology and understanding the large scale functioning of reef fish assemblages in the Pacific

Abstract: The regional species and functional diversity of reef fishes determines to a significant extent the local species and functional diversity of these fishes in the Pacific. As regional diversity is related to large scale factors such as island size and connectivity, distance to the biodiversity center, latitude, these factors also play a role on the distribution and composition of local reef fish diversity. Amongst the life history traits, (adult) size follows gradients linked to island size and connectivity. Species range is also found to be correlated to species (adult) size and larval duration and is also correlated to island size and connectivity. Colonizing ability can be as well related to (adult) size (finding mates, reproductive capacity, resource limitation). These findings explain why on small isolated islands the proportion of large species is higher than on large connected islands in the Pacific. One of the major consequence is the shape of the diversity-biomass relationship which presents a steeper slope on small isolated islands but reaches lower values of biomass because of lower diversity. The implications for management are important, in particular this shows how small islands will be far more fragile to fishing than larger or well connected islands. These findings may find applications in other systems where "ecological islands" exist.

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