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Cues for metamorphosis of brachyuran crabs: An overview

机译:Brachyuran蟹变态的线索:概述

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SYNOPSIS. The early life cycle of brachyuran crabs has a planktonic dispersal stage consisting of a variable number of zoeal larvae followed by the molt to the megalopa stage. Megalopae undergo horizontal transport to the settlement site where they settle out of the water column and metamorphose to the first crab (juvenile) stage. This review provides an overview of recent laboratory, studies of cues that shorten or lengthen the time to metamorphosis (TTM) of the megalopa stage. Megalopae cannot delay metamorphosis indefinitely and have a temporal threshold beyond which metamorphosis occurs without habitat cues. The TTM can be shortened about 15-25% upon exposure to acceleration cues, which include chemical cues and odors from adult substrate, aquatic vegetation, biofilms, conspecifies, estuarine water, humic acids, related crab species, and potential prey. Cues shown to delay metamorphosis include ammonium, hypoxia, predator odor and extreme temperature and salinity conditions. There is no evidence that structural mimics or natural substrate affect TTM.
机译:概要。 Brachyuran螃蟹的早期生命周期具有浮游性扩散阶段,该阶段由数量不等的幼虫组成,然后蜕皮到大头opa阶段。巨ae经过水平运输到达定居点,在那里它们从水柱中移出并变质到第一蟹(幼体)阶段。这篇综述概述了最近的实验室研究,这些研究缩短或延长了半生不熟阶段变态(TTM)时间的提示。巨蟹科不能无限期地延迟变态,并且具有一个时间阈值,超过该阈值就可以发生变态而没有栖息地线索。暴露于加速线索时,TTM可以缩短约15-25%,包括来自成人底物,水生植物,生物膜,特殊物种,河口水,腐殖酸,相关蟹类和潜在猎物的化学线索和气味。延迟变态的线索包括铵,低氧,捕食者的气味以及极端温度和盐度条件。没有证据表明结构模拟物或天然底物会影响TTM。

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