Periodic invasions during El Nino events by the predatory lined shore crab (Pachygrapsus crassipes): forecasted effects of its establishment on direct-developing indigenous prey species (Littorina spp.)

Boulding E. G.; Yamada S. Behrens; Schooler S. S.; Shanks A. L.

首页> 外文期刊>Canadian Journal of Zoology >Periodic invasions during El Nino events by the predatory lined shore crab (Pachygrapsus crassipes): forecasted effects of its establishment on direct-developing indigenous prey species (Littorina spp.)

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Periodic invasions during El Nino events by the predatory lined shore crab (Pachygrapsus crassipes): forecasted effects of its establishment on direct-developing indigenous prey species (Littorina spp.)

机译：掠夺岸蟹（Pachygrapsus Crassipes）的El Nino事件期间的定期入侵：预测其在直接发展土着猎物（Littorina SPP）上的建立效果

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Coevolutionary arms races between shelled gastropods and their predators are more escalated near the equator. Therefore, temperate gastropods are predicted to be maladapted to highly specialized tropical shell-crushing crabs. The northern geographical limit of the lined shore crab (Pachygrapsus crassipes J.W. Randall, 1840) does not usually overlap with the southern limit of the Sitka periwinkle (Littorina sitkana Philippi, 1846), which lacks a pelagic larval stage. Large El Nino events increased the winter abundance and poleward transport of P. crassipes larvae from California (USA) in the Davidson Current. Temporary intertidal crab populations that included females with eggs were observed 1-4 years later, >1000 km north of its usual geographical range. Laboratory experiments showed that L. sitkana did not have a size refuge from adult P. crassipes. Moreover, consumption rates of adult L. sitkana by P. crassipes were 10-fold higher than those published for indigenous purple shore crabs (Hemigrapsits mulus (Dana, 1851)) with similar claw sizes. Additionally, the upper intertidal limit of invading P. crassipes was higher than that of H. nudus. Consequently, the invasion of P. crassipes reduced the width of L. sitkana's spatial refuge from predation. The permanent presence of this subtropical predator could reduce the intertidal distribution of this temperate gastropod, thereby causing contraction of its southern range limit.

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《Canadian Journal of Zoology》 |2020年第12期|共11页
作者
Boulding E. G.; Yamada S. Behrens; Schooler S. S.; Shanks A. L.;
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作者单位

Univ Guelph Dept Integrat Biol Guelph ON N1G 2W1 Canada;

Oregon State Univ Dept Integrat Biol Corvallis OR 97331 USA;

South Slough Natl Estuarine Res Reserve POB 5417 Charleston OR 97420 USA;

Oregon Inst Marine Biol POB 5389 Charleston OR 97420 USA;

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正文语种 eng
中图分类动物学;
关键词
lined shore crab; Pachygrapsus crassipes; range expansion; El Nino; larval transport; Davidson Current; predation; Sitka periwinkle; Littorina sitkana; Barkley Sound; Nootka Sound;

机译：衬里的岸蟹;帕奇利格普斯崩溃;范围扩张;el nino;幼虫运输;戴维森常规;掠夺;锡尔托里纳·锡·锡尔威琴;路易田地带;Barkley声音;Nootka声音;

Periodic invasions during El Nino events by the predatory lined shore crab (Pachygrapsus crassipes): forecasted effects of its establishment on direct-developing indigenous prey species (Littorina spp.)

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