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Population status of the black sea u...

Lugo Ascorbe, Miguel Antonio.

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Population status of the black sea urchin Diadema antillarum (Philippi) in La Parguera, Puerto Rico, 20 years after the mass mortality event.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Population status of the black sea urchin Diadema antillarum (Philippi) in La Parguera, Puerto Rico, 20 years after the mass mortality event./
作者:	Lugo Ascorbe, Miguel Antonio.
面頁冊數:	70 p.
附註:	Source: Masters Abstracts International, Volume: 43-04, page: 1379.
Contained By:	Masters Abstracts International43-04.
標題:	Engineering, Marine and Ocean. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1424403
ISBN:	0496897969

Population status of the black sea urchin Diadema antillarum (Philippi) in La Parguera, Puerto Rico, 20 years after the mass mortality event.
Lugo Ascorbe, Miguel Antonio.

Population status of the black sea urchin Diadema antillarum (Philippi) in La Parguera, Puerto Rico, 20 years after the mass mortality event. - 70 p.

Source: Masters Abstracts International, Volume: 43-04, page: 1379.

Thesis (M.M.S.)--University of Puerto Rico, Mayaguez (Puerto Rico), 2004.

Before the 1983 mass mortality event, the conspicuous sea urchin Diadema antillarum was considered a key species in Caribbean coral reefs. This epizootic event caused mortalities of up to 99% in many localities of the western Atlantic and Caribbean. In this study, the current status (after 20 years) of populations of D. antillarum was assessed in five reef localities off the southwest coast of Puerto Rico. Densities were estimated by counting all urchins in each of five band transects (20 x 2 m) in each of three depth intervals (0--3 m, 4--10 m, >10 m) at each reef site. Size structure of the urchin populations were estimated by measurement of maximum test diameter of every urchin found along each band transect. Habitat complexity (i.e., rugosity) was determined using the chain method of CARICOMP. Density differences were compared as a function of site, rugosity and depth. A linear regression showed that the densities of D. antillarum where influenced by factors like depth and site (P < 0.0001). The test revealed that in the present state of urchin populations, rugosity did not have a statistically significant effect on densities but a trend to higher densities in more complex areas was observed. Mean densities per reef varied between 0.01--0.82 ind/m2, with a mean density of 0.23 ind/m2 for the entire area surveyed. (Abstract shortened by UMI.)

ISBN: 0496897969Subjects--Topical Terms:

1019064
Engineering, Marine and Ocean.

Population status of the black sea urchin Diadema antillarum (Philippi) in La Parguera, Puerto Rico, 20 years after the mass mortality event.
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