Effects of chemical cues on visual orientation of juvenile blue crabs, Callinectes sapidus (Rathbun)
Effects of chemical cues on visual orientation of juvenile blue crabs, Callinectes sapidus (Rathbun)
复制标题
DOI：
10.1016/s0022-0981(01)00330-6
复制
发表时间：
2001-11-30
影响因子：
2
通讯作者：
Rittschof, D
中科院分区：
文献类型：
--
作者：
Diaz, H;Orihuela, B;Rittschof, D
阶段I蟹出现在河口苗圃的沉水植被床中。在达到IV-V龄期后，幼虫离开托儿所栖息地，分散在整个河口。这项研究验证了一种假设，即在化学线索存在的情况下，I级和IV-V级蟹对视觉目标有不同的行为反应。在圆形竞技场中，在近海水域(对照)的化学线索、河口水生植物和捕食者的气味(河口化学线索)的存在下，测试了螃蟹对不同视角(20度至350度)的固体(黑色)和垂直条纹(黑色和白色)矩形目标的定向。在近海水域第一阶段，螃蟹朝向远离几乎所有固体目标，这被解释为为躲避捕食者而做出的逃逸反应。暴露在所有河口化学物质的提示下，它们的行为发生了戏剧性的变化，因为它们表现出一种警报反应，在这种反应中，它们不会定位于视觉提示，它们的主要行为是保持不动。IV-V级蟹对固体目标的反应非常敏感，因为它们在所有水域类型中通常都会远离30度和90度的目标，向270度的固体目标游去。测试的所有阶段蟹对条纹目标的反应更加多样化。在任何气味环境中，第一阶段的螃蟹通常不会定向到条纹目标。相比之下。阶段IV-V蟹对条纹目标的反应因气味类型不同而不同。因此，这一假设得到了支持，因为对视觉线索的定向存在个体发育变化。在暴露于化学线索(例如水生植被与捕食者气味)后，定向的细微变化并不明显。螃蟹似乎有两套行为反应。它们在近海水域表现出逃逸反应，在河口苗圃地区存在化学线索时表现出逃逸和警报反应的组合。(C)2001 Elsevier Science B.V.保留所有比赛。
Stage I crabs of Callinectes sapidus occur in beds of submerged vegetation in estuarine nursery areas. After reaching the IV-V instars, juveniles leave nursery habitats and disperse throughout estuaries. This study tested the hypothesis that I and IV-V stage crabs have different behavioral responses to visual targets in the presence of chemical cues. Orientation to solid (black) and vertically striped (black and white) rectangular targets subtending different visual angles (20 degrees to 350 degrees) as viewed by the crabs was tested in a circular arena in the presence of chemical cues from Offshore water (control), and odor from estuarine aquatic vegetation, and predators (estuarine chemical cues). In the presence of Offshore water Stage I crabs oriented away from almost all solid targets, which was interpreted as an escape response for predator avoidance. Exposure to all estuarine chemicals cues dramatically changed their behavior, as they displayed an alarm response, in which they did not orient to visual cues and their predominant behavior was to remain immobile. Stages IV-V crabs were very responsive to solid targets, as they generally swam away from the 30 degrees and 90 degrees targets and toward the 270 degrees solid targets in all water types. Responses of all stage crabs tested to striped targets were more diverse. Stage I crabs generally did not orient to striped targets in any odor environment. In contrast. Stages IV-V crab responses to striped targets varied with the odor type. Thus, the hypothesis was supported because there was an ontogenetic change in orientation to visual cues. Subtle changes in orientation upon exposure to chemical cues (e.g. aquatic vegetation versus predator odor) were not evident. Crabs appeared to have two sets of behavioral responses. They showed an escape response in Offshore water and a combination of escape and alarm responses in the presence of chemical cues from estuarine nursery areas. (C) 2001 Elsevier Science B.V. All fights reserved.