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Unexpectedly high diversity of Monoporella (Bryozoa : Cheilostomata) in the Aleutian Islands, Alaska : Taxonomy and distribution of six new species

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Title: Unexpectedly high diversity of Monoporella (Bryozoa : Cheilostomata) in the Aleutian Islands, Alaska : Taxonomy and distribution of six new species
Authors: Dick, Matthew H. Browse this author →KAKEN DB
Keywords: Alaska
Aleutian Islands
local radiation
species diversity
Issue Date: Jan-2008
Publisher: Zoological Society of Japan
Journal Title: Zoological Science
Volume: 25
Issue: 1
Start Page: 36
End Page: 52
Publisher DOI: 10.2108/zsj.25.36
PMID: 18275244
Abstract: The cheilostome bryozoan genus Monoporella is poorly resolved taxonomically; only four Recent species have been formally described, though several undescribed species have been reported in the literature. The literature indicates no more than five species in the genus occurring in any local region of the world, with one to three species in most regions where the genus has been reported. I examined bryozoans from 52 trawl catches in the western and western-central Aleutian Islands, Alaska, and found specimens of Monoporella in 12 of these samples. Study of these specimens by scanning electron microscopy (SEM) revealed six new species that are described herein: M. flexibila, M. elongata, M. gigantea, M. ellefsoni, M. seastormi, and M. aleutica. Two of the species have erect colony morphologies, a condition not previously reported in Monoporella. The species diversity of Monoporella appears to be greater in the Aleutians than in any other part of the world adequately surveyed. I discuss whether this apparent high diversity is an artifact due to insufficient sampling in the deep shelf zone, and present two hypotheses to explain this high diversity should it prove not to be an artifact: 1) the present high local diversity represents a relict of past high diversity occurring broadly around the North Pacific rim; and 2) a local radiation of Monoporella occurred in the Aleutian archipelago.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Matthew Hill Dick

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