Sea Urchins on the Move: Distribution Change of Echinometra in Mo’orea French Polynesia

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" Sea Urchins on the Move: Distribution Change of Echinometra in Mo’orea French Polynesia "
Zizka, Maria D.

Document Type	:	AL
Record Number	:	925753
Doc. No	:	LA6gp0s5mz
Language of Document	:	English
Main Entry	:	Zizka, Maria D.
Title & Author	:	Sea Urchins on the Move: Distribution Change of Echinometra in Mo’orea French Polynesia [Article]\ Zizka, Maria D.
Title of Periodical	:	Berkeley Scientific Journal
Volume/ Issue Number	:	15/1
Date	:	2012
Abstract	:	The island of Mo’orea in French Polynesiafunctions as a model system to study the biologicaland ecological concept of niche differentiation,whereby two or more species are forced into differenthabitats so as to avoid competition with each other.In the waters surrounding this island, two speciesof sea urchin within the genus Echinometra livein distinctly different habitats. Previous studiesdocument Echinometra sp. A located exclusivelyon the fringing reef and Echinometra mathaeilocated exclusively on the barrier reef. This studyinvestigated three short-term factors (availablespace, nutrient supply, and predation) that mightbe influencing this spatial distribution. None ofthese factors appear to be causing the separation ofE. sp. A and E. mathaei. In fact, they all support thedistributional findings of this study that showednon-mutually exclusive distribution data on the tworeef types.