DMCA
to species from adjacent regions*
BibTeX
@MISC{Schrödl_tospecies,
author = {Michael Schrödl and Rencia Especial and A Las and Especies De and Regiones Adyacentes Recolecciones},
title = {to species from adjacent regions*},
year = {}
}
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Abstract
SUMMARY: Extensive recent collections and taxonomical revisions provide a basis for the first zoogeographical analysis of Magellan Nudibranchia. Using 36 of 57 nominal species described in this area, the degree of endemism has been decreased from 70 % to 31%. Very close faunistic relationships to northern Argentina are evident as five of six known species (83%) are shared with the Magellan Province. With a 43 % overlap of Magellan species in the southern part of the Peruvian faunal Province (44 species), this area shows a transitional character between cold- and warm-temperate waters. Only three of 36 Magellan species are found in common with the high Antarctic (ca. 30 species), revealing a low faunal sim-ilarity of about 10%. High Antarctic waters are characterized by high nudibranch endemism (about 80%). Of the ten nudi-branch species reported from South Georgia, two are exclusively shared with Magellan, two with high Antarctic and three with both Magellan and Antarctic waters, indicating transitional, Subantarctic conditions. One species is endemic to South Georgia, two other species are insufficiently known and may or may not be endemic. Generally, the Antarctic Convergence appears to be a distributional barrier for Magellan nudibranchs. In contrast, some Antarctic nudibranch species extend far into the Atlantic, obviously with cold Antarctic deep water currents. Coastal, cold temperate Magellan nudibranchs have rel-atively low affinities to the deep water fauna off Argentina, which seems to be predominantly submerged Antarctic species, but this bathymetrical zonation needs to be further investigated.
Keyphrases
adjacent region south georgia high antarctic magellan specie magellan nudibranchia magellan province low faunal sim-ilarity northern argentina antarctic nudibranch specie subantarctic condition extensive recent collection transitional character high antarctic water antarctic water high nudibranch endemism ten nudi-branch specie bathymetrical zonation need cold temperate magellan first zoogeographical analysis faunistic relationship distributional barrier peruvian faunal province antarctic convergence taxonomical revision warm-temperate water low affinity nominal specie cold antarctic deep water current southern part antarctic specie known specie deep water
