External factors determining seasonal breeding in a subtropical population of the shore crabPachygrapsus transversus(Gibbes, 1850) (Brachyura, Grapsidae)
作者:
AUGUSTOA.V. FLORES,
MARIALUCIA NEGREIROS-FRANSOZO,
期刊:
Invertebrate Reproduction & Development
(Taylor Available online 1998)
卷期:
Volume 34,
issue 2-3
页码: 149-155
ISSN:0792-4259
年代: 1998
DOI:10.1080/07924259.1998.9652647
出版商: Taylor & Francis Group
关键词: Pachygrapsus transversus;shore crab;seasonal breeding;environmental factors
数据来源: Taylor
摘要:
Monthly samples of the shore crabPachygrapsus transversusfrom two distinct annual periods showed that ovigerous females are present throughout the year in the population. However, the relative ovigerous abundance of specimens among sexually mature changes from less than 10% during the winter months to almost 80% in summer. Linear correlations for each year revealed that both temperature and photoperiod were positively associated with relative abundance of ovigerous females. Multiple regression analyses suggested that photoperiod was the main factor affecting breeding in this species. Timing of observed reproductive pattern may enhance larval survival because of particular oceanographic conditions in the study region and favor early juvenile development due to certain species-specific growth features.
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