Are hermit crabs looking for light and large shells? evidence from natural and field induced shell exchanges
Are hermit crabs looking for light and large shells? evidence from natural and field induced shell exchanges
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DOI：
10.1016/s0022-0981(97)00155-x
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发表时间：
1998-04-01
影响因子：
2
通讯作者：
Rodriguez-Juarez, C
中科院分区：
文献类型：
--
作者：
Osorno, JL;Fernandez-Casillas, L;Rodriguez-Juarez, C
陆生寄居蟹（Coenobita compressus（H.米尔恩·爱德华兹））在伊莎贝尔岛，墨西哥，喜欢Nerita（Ritena）scabricosta（Lanark 1822）比其他种类的贝壳。糙肋螺是最轻的贝壳种类，在岛上所有种类中具有最高的内部体积/重量比（IV/W比）。较重的外壳（IV/W比低）携带成本更高，可能会抑制生长。我们假设螃蟹会寻找具有高IV/W比的贝壳以节省能量，并预测在每个单独的贝壳交换中，螃蟹会更喜欢具有较高IV/W比的贝壳。自然界中携带首选壳（IV/W比高）和使用不太首选的壳（IV/W比低）的螃蟹之间自发的侵略性壳交换相互作用的观察支持了这一观点。通过在现场诱导个人壳交换，我们实验证实了具有高IV/W比的壳的偏好，我们还表明，螃蟹喜欢更大的壳，他们轴承。移动到一个更大但不重的外壳可能会促进生长，虽然节省了能量，否则会花在运动上。高增长率似乎是有利的，因为大小是生育力的相关性，因为大的男性显然有更多的机会与女性，和大的女性产生更大的离合器，从而表明可能的生殖优势，首选轻和大的贝壳。(C)1998年Elsevier Science B.V.
Terrestrial hermit crabs (Coenobita compressus (H. Milne Edwards)) on Isabel island, Mexico, prefer Nerita (Ritena) scabricosta (Lanark 1822) over other species of shells. Nerita scabricosta, the lightest species of shell, has the highest internal volume/weight ratio (IV/W ratio) of all species available at the island. Heavier shells (low IV/W ratio) are more costly to carry and may restrain growth. We hypothesized that crabs will search for shells with high IV/W ratios to save energy, and predicted that in every individual shell-exchange crabs will prefer a shell with a higher IV/W ratio. Observations of spontaneous aggressive shell-exchange interactions in nature between crabs carrying preferred shells (with high IV/W ratio) and crabs using less preferred species of shells (low IV/W ratio) support this idea. By inducing individual shell exchanges in the field, we experimentally confirmed the preference for shells with high IV/W ratio, and we also showed that crabs prefer larger shells over those they were bearing. Moving to a larger but not heavier shell may facilitate growth though saving energy that would otherwise be spent in locomotion. High growth rates seem to be advantageous because size is a correlate of fertility, since large males apparently have more access to females, and large females produce larger clutches, thus indicating the possible reproductive benefits for preferred light and large shells. (C) 1998 Elsevier Science B.V.