Spatial distribution, density, and relative growth of Microphrys bicornutus (Latreille, 1826) (Brachyura: Majidae) in five biotopes in a Thalassia complex
Spatial distribution, population density, number of ovigerous females, and relative growth of Microphrys bicornutus were studied in an extremely shallow Thalassia complex (Buchuaco- Venezuela). Monthly sampling was undertaken in 5 different biotopes (zones) (July 1988 to December 1990). Zone 3 (co...
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2007-03-01
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doaj-c5e2bef43bfb46b6bec37571fd31c7232021-05-05T13:49:42ZengConsejo Superior de Investigaciones CientíficasScientia Marina0214-83581886-81342007-03-0171151410.3989/scimar.2007.71n1521Spatial distribution, density, and relative growth of Microphrys bicornutus (Latreille, 1826) (Brachyura: Majidae) in five biotopes in a Thalassia complexCarlos A. Carmona-Suárez0Centro de Ecología, Instituto Venezolano de Investigaciones Científicas (IVIC), CaracasSpatial distribution, population density, number of ovigerous females, and relative growth of Microphrys bicornutus were studied in an extremely shallow Thalassia complex (Buchuaco- Venezuela). Monthly sampling was undertaken in 5 different biotopes (zones) (July 1988 to December 1990). Zone 3 (coral rubble) was the least populated by M. bicornutus. The highest densities were found in Zones 1 (coral rubble and macro algae) and 4 (Thalassia and calcareous algae). Crab size ranged between 1.86 and 35.40 mm (carapace length). The largest mean size was found in Zones 2 and 5, and the smallest in Zone 1. The least mean percentage of ovigerous females was found in Zone 3, and the highest in Zone 5. There were strong temporal fluctuations, with the absence of ovigerous females in the first months of each year. The biometric data showed that pre-pubertal males ranged from 1.80 to 24.20 mm carapace length, and post-pubertals from 15.16 to 26.15. Pre-pubertal females ranged from 3.16 to 20.25 and post-pubertals from 8.84 to 21.85. Zone 3 was the most inadequate biotope for M. bicornutus, as it had the lowest density and the least mean percentage of ovigerous females. Zone 4 was the most appropriate biotope. Temporal absence of ovigerous females and the small sizes of the crabs in Buchuaco could be due to extreme environmental conditions.http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/21crustaceabrachyuraspider crabsmicrophrys bicornutusspatial distributionpopulation densityrelative growth |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Carlos A. Carmona-Suárez |
spellingShingle |
Carlos A. Carmona-Suárez Spatial distribution, density, and relative growth of Microphrys bicornutus (Latreille, 1826) (Brachyura: Majidae) in five biotopes in a Thalassia complex Scientia Marina crustacea brachyura spider crabs microphrys bicornutus spatial distribution population density relative growth |
author_facet |
Carlos A. Carmona-Suárez |
author_sort |
Carlos A. Carmona-Suárez |
title |
Spatial distribution, density, and relative growth of Microphrys bicornutus (Latreille, 1826) (Brachyura: Majidae) in five biotopes in a Thalassia complex |
title_short |
Spatial distribution, density, and relative growth of Microphrys bicornutus (Latreille, 1826) (Brachyura: Majidae) in five biotopes in a Thalassia complex |
title_full |
Spatial distribution, density, and relative growth of Microphrys bicornutus (Latreille, 1826) (Brachyura: Majidae) in five biotopes in a Thalassia complex |
title_fullStr |
Spatial distribution, density, and relative growth of Microphrys bicornutus (Latreille, 1826) (Brachyura: Majidae) in five biotopes in a Thalassia complex |
title_full_unstemmed |
Spatial distribution, density, and relative growth of Microphrys bicornutus (Latreille, 1826) (Brachyura: Majidae) in five biotopes in a Thalassia complex |
title_sort |
spatial distribution, density, and relative growth of microphrys bicornutus (latreille, 1826) (brachyura: majidae) in five biotopes in a thalassia complex |
publisher |
Consejo Superior de Investigaciones Científicas |
series |
Scientia Marina |
issn |
0214-8358 1886-8134 |
publishDate |
2007-03-01 |
description |
Spatial distribution, population density, number of ovigerous females, and relative growth of Microphrys bicornutus were studied in an extremely shallow Thalassia complex (Buchuaco- Venezuela). Monthly sampling was undertaken in 5 different biotopes (zones) (July 1988 to December 1990). Zone 3 (coral rubble) was the least populated by M. bicornutus. The highest densities were found in Zones 1 (coral rubble and macro algae) and 4 (Thalassia and calcareous algae). Crab size ranged between 1.86 and 35.40 mm (carapace length). The largest mean size was found in Zones 2 and 5, and the smallest in Zone 1. The least mean percentage of ovigerous females was found in Zone 3, and the highest in Zone 5. There were strong temporal fluctuations, with the absence of ovigerous females in the first months of each year. The biometric data showed that pre-pubertal males ranged from 1.80 to 24.20 mm carapace length, and post-pubertals from 15.16 to 26.15. Pre-pubertal females ranged from 3.16 to 20.25 and post-pubertals from 8.84 to 21.85. Zone 3 was the most inadequate biotope for M. bicornutus, as it had the lowest density and the least mean percentage of ovigerous females. Zone 4 was the most appropriate biotope. Temporal absence of ovigerous females and the small sizes of the crabs in Buchuaco could be due to extreme environmental conditions. |
topic |
crustacea brachyura spider crabs microphrys bicornutus spatial distribution population density relative growth |
url |
http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/21 |
work_keys_str_mv |
AT carlosacarmonasuarez spatialdistributiondensityandrelativegrowthofmicrophrysbicornutuslatreille1826brachyuramajidaeinfivebiotopesinathalassiacomplex |
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