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Rocky shore habitats are common in the Arabian Gulf region, however, there is little knowledge of the patterns of spatial and temporal distribution of key intertidal organisms. The spatial and seasonal distribution of Leptodius exaratus, a keystone species rocky shores on the Kuwait coast, were investigated to better understand the ecology of the species and to gain a wider knowledge of the ecology of the rocky shore habitats in the northwest Arabian Gulf. Intensive sampling across six sites along Kuwait’s coastline over a 14 month period between November 2013 and December 2014 indicated seasonal patterns of crab abundance, increasing during the warm season and decreasing during winter and with a more large crabs observed during the summer. L. exaratus was more abundant in the mid intertidal zone on both sheltered and exposed shores. Their abundance increased towards the lower shore in sheltered sites, whereas abundance was greater towards the higher shore in exposed sites. Males and females inhabit the same habitat, with similar spatial and seasonal distributions. There was high seasonal recruitment of juveniles during summer between July and September, with some low levels of recruitment later in October and November. Moreover, juveniles follow a similar pattern of distribution as adult crabs, with abundance of juveniles being directly related to the abundance of the adult crabs and ovigerous females present on each shore. This indicates direct or indirect recruitment to the adult intertidal habitat. Significant differences in crab abundance were seen between specific sampling sites, but not at a regional level between sheltered and exposed shorelines. This suggests that abundance is influenced by localised differences between rocky shore habitat, such as habitat complexity. L. exaratus is also exploited by intertidal gleaning, which may indirectly influence patterns of crab abundance through localised differences in habitat damage.

Keywords

  • Seasonality, Brachyura, Intertidal zone, Tidal level, Arabian gulf
Original languageEnglish
Pages (from-to)101325
Number of pages1
JournalRegional Studies in Marine Science
Volume37
Early online date26 May 2020
DOIs
Publication statusPublished - 31 May 2020
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