Size composition and sex ratio of Anadara tuberculosa and Anadara similis in a mangrove reserve from the northwest of Ecuador

作者：Flores Luis^*; Licandeo Roberto

来源：Revista de Biologia Marina y Oceanografia, 2010, 45(3): 541-546.

• Shell length
• mangrove cockles
• natural beds

Shell length frequency distribution (SLFD) and sex ratio of a subpopulation of the mangrove cockles Anadara tuberculosa and Anadara similis were analyzed from natural beds in the Cayapas-Mataje Ecological Mangrove Reserve, Ecuador. The SLFD was different between sexes for both species; females were larger than males. Subpopulations of A. tuberculosa and A. similis were dominated by females throughout the year. The overall sex ratio was 2.6:1 (female: male), although with variations in the monthly samples, from 1.2:1 to 5.9:1 in A. tuberculosa and 1.9:1 to 5.3:1 in A. similis. Possibly, these results may be due to differential growth rate between sexes and environmental factors along the year.

• 出版日期2010