Habitat modelling of <Emphasis Type="Italic">Electrona antarctica</Emphasis> (Myctophidae,Pisces) in Kerguelen by generalized additive models and geographic information systems |
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Authors: | Christophe Loots Philippe Koubbi Guy Duhamel |
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Institution: | 1.Laboratoire d’ichtyo-écologie marine (LIMUL),Université du Littoral C?te d’Opale,Boulogne-sur-mer Cedex,France;2.Département des milieux et peuplements aquatiques,Muséum National d’Histoire Naturelle (MNHN),Paris Cedex 05,France |
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Abstract: | Electrona antarctica is one of the most abundant mesopelagic fishes in the oceanic zone surrounding the Kerguelen Archipelago in the Indian sector
of the Southern Ocean. Generalized additive models (GAM) combined with geographical information systems (GIS) were used to
predict and map the abundance of this species according to three environmental variables: sea surface temperature, bathymetry
and surface chlorophyll a. The model was applied on the Antarctic Polar Front in the eastern part of Kerguelen Archipelago. E. antarctica seems to be linked to areas presenting low chlorophyll a concentrations, depths greater than 500 m and temperatures lower than 5°C. The model was then applied to the Kerguelen’s
plateau for three different years: 1998, 1999 and 2000. The position of Antarctic Polar Front and the intensity of an upwelling
play an important role in the abundance variability of E. antarctica. Furthermore, the model allows the understanding of the habitat of E. antarctica and its trophic place in the pelagic ecosystem. |
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Keywords: | Generalized additive models (GAM) Geographic information systems (GIS) Fish Myctophidae Electrona antarctica Southern ocean Kerguelen islands |
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