Population ecology of the sand-dwelling hermit crab Diogenes nitidimanus. IV Larval settlement
Population ecology of the sand-dwelling hermit crab Diogenes nitidimanus. IV Larval settlement
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沙居寄居蟹 Diogenes nitidimanus 的种群生态学。
DOI：
10.3354/meps078139
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
A. Asakura
中科院分区：
文献类型：
--
作者：
A. Asakura
1982年和1983年对砂栖寄居蟹Dogenes nitidirnanus Terao幼蟹的定居格局进行了调查。8月中旬至12月初发现新定居的螃蟹，9月出现定居高峰。蟹类在研究区的极低水位涨潮（ELWS）水位附近定居，那里有大量的小而空的贝壳。8、11、12月蟹类密度与小空壳密度呈正相关。最近定居的螃蟹没有发现在上坪（约1米以上的ELWS）或在潮下带5米以下的ELWS，尽管在这些位置的小贝壳丰富。小的，空的贝壳被引入到研究区的下潮间带，它们的存在可能导致定居的青少年的数量增加。这种可能性表明，小贝壳的短缺限制了寄居蟹的定居。
Settlement patterns of juveniles of the sand-dwelling hermit crab D~ogenes nitidirnanus Terao were examined in 1982 and 1983. Newly settled crabs were found from mid-August to the beginning of December, and peak settlement occurred in September. Crabs settled near the water level of extreme low water spnng tide (ELWS) in the study area, where small, vacant shells were abundant. The density of settled crabs and that of small vacant shells were positively correlated in August, November and December. The recently settled crabs were not found on the upper flat (about 1 m above ELWS) or in the subtidal zone 5 m below the ELWS, in spite of the abundance of small shells at those locations. Small, vacant shells were introduced into the lower intertidal zone of the study area, and their presence may have resulted in an increase in the number of settled juveniles. This possibility suggests that shortage of small shells limits the settlement of hermit crabs.