通常有蟹友問, 橙紅背甚麼螺殼, 我會說蠑螺.
在此說聲對不起, 因為忽略了個體的大小.
最近看了一篇文獻, 講述個體小的橙紅陸(前甲長<8mm)反而會偏向背長型的螺殼, 到了中型和大型時, 才會以銀口蠑螺為主.
引述:
"The smallest size class (all C. rugosus and C. perlatus, < 8mm C.L.) used the greatest number of shell species (63) .
Fewer shell species were used with increasing hermit crab size. On all islets combined the shell species diversity index of C. perlatus decreased from 2.90 for the smallest crabs ( < 8 mm C'L) to 0.09 for the largest hermit crabs ( > 19mm c.L.). Large crabs also used different shell species than smaller crabs (Tables 2A, B, C). Rhinoclavis sinensis was the shell most commonly used by the smallest size class , while virtually all (98 percent) of the largest crabs were found in Turbo argyrostomus."
詳細看此:
http://www.tonycoenobita.com/Patterns.pdf
表2A, 顯示小型橙紅(前甲長<8mm)所選用的螺殼, 種類繁多.
表2B&C, 顯示中型(前甲長8-10mm)及大型橙紅(前甲長>19mm)所選用的螺殼, 超過9成以上是用銀口蠑螺.
銀口蠑螺
