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Rainfall and Seasonal Changes in Arthropod Abundance on a Tropical Oceanic Island

L. K. Tanaka and S. K. Tanaka
Biotropica
Vol. 14, No. 2 (Jun., 1982), pp. 114-123
DOI: 10.2307/2387740
Stable URL: http://www.jstor.org/stable/2387740
Page Count: 10
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Rainfall and Seasonal Changes in Arthropod Abundance on a Tropical Oceanic Island
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Abstract

Weekly sweeps for arthropods were taken and compared for an entire year (1977) on Grenada, West Indies, where there is a marked wet and dry season. The average wet-season abundance of arthropods was 2.3 times greater, and the wet-season biomass (grams) was 3.1 times greater, than that for the dry season. A significant correlation between biomass and abundance existed for the entire year. There was no change in arthropod size between wet and dry season. Intra-seasonal variations in arthropod abundance occurred, and were significantly correlated with seven-day accumulated rainfall following a three-week interval. Abundance of seven of 10 taxa showed the same three-week response to rain-fall. Coleoptera were identified to species, so that species diversity, species overlap, and feeding guilds for the entire year could be compared to Central American Coleoptera. The results indicate the Coleoptera fauna on Grenada are more generalized compared to the tropical mainland, and composed of the same species whose abundance fluctuates seasonally throughout the year.

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