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The female reproductive biology of Chasmagnathus granulatus Dana, a semiterrestrial    burrowing crab endemic to the southwestern Atlantic, was compared in two    contrasting coastal habitats: San Antonio (SA, marine) and Mar Chiquita (MC,    estuarial). Mature females were collected monthly for 1.5 years and the ovarian    cycle was described using a qualitative scale. Gonadosomatic (GSI) and hepatosomatic    (HSI) indexes were calculated. The highest GSI and HSI occurred early in    the reproductive season in SA and during the non-reproductive season in MC.    The beginning and duration of the reproductive season also differed between    populations: it started later and was shorter in SA. In MC, secondary vitellogenesis    continued when the reproductive season had finished, and the ovaries remained    fully developed throughout the non-reproductive season (winter). Therefore,    females of MC were ready to lay eggs as soon as spring environmental conditions    appeared. However, SA females did not attain a fully developed ovary during    winter. A limited food supply would restrict the available energy to complete    secondary vitellogenesis at the end of the reproductive season in SA, after    the last spawning. Thus, the vitellogenic cycle should be completed in the    following spring, causing a delay in the beginning of the reproductive period.    In addition, the higher temperature amplitude may cause the reproductive  period in SA to end early

scientia marina

Interpopulational differences in the female reproductive cycle of the southwestern Atlantic estuarine crab &lt;i&gt;Chasmagnathus granulatus Dana&lt;/i&gt;, 1851 (Brachyura: Grapsoidea: Varunidae)