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Comparative phototaxis of calanoid and harpacticoid copepods

机译：颅骨和类拟actic足类的比较趋光性

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摘要

A comparative taxonomic approach was used to examine copepod phototaxis. The sign of phototaxis, spectral responses, and intensity thresholds were examined for two species each from the orders Calanoida and Harpacticoida. Parvocalanus crassirostris is a typical calanoid, living in the water column, while P. pelagicus (Calanoida) is unusual in having a benthic association. Tisbe biminiensis is a typical harpacticoid, living on the benthos, while Euterpina acutifrons (Harpacticoida) is atypical, living in the water column. This is the first empirical study to include harpacticoid phototaxis. Tisbe and Pseudodiaptomous displayed negative phototaxis, and the sign of phototaxis for all species is likely to help them persist in their respective habitats. We suspect that the sign of phototaxis is either flexible or a prerequisite before changing habitats. Spectral sensitivity, however, is more complex and, we hypothesize, may be partially constrained by ancestry rather than fully adapted for the modern/current habitat. Pseudodiaptomous pelagicus, benthic calanoid, had a peak spectral response similar to other calanoids. E. acutifrons, pelagic harpacticoid, had a peak spectral response similar to light-adapted T. biminiensis. E. acutifrons exhibited positive or negative photoresponses dependent upon spectrum, a dual strategy unobserved in other copepods but potentially effective for maintaining vertical position. We suggest a Constrained Sensitivity Hypothesis where ancestral habitat may influence the extent and nature of modern responses.
机译：比较的分类学方法用于检查examine足趋光性。检查了来自卡拉诺达（Calanoida）和Harpacticoida两种物种的趋光性，光谱响应和强度阈值。 voc（Parvocalanus crassirostris）是生活在水柱中的典型cal类，而远古疟原虫（Calanoida）的底栖生物很罕见。 Tisbe biminiensis是一种典型的类立足动物，生活在底栖动物上，而Euterpina acutifrons（Harpacticoida）是非典型的，生活在水柱中。这是第一个包含类拟趋光趋同性的实证研究。 Tisbe和假dia鱼表现出负趋光性，所有物种的趋光性迹象可能有助于它们在各自的生境中持久存在。我们怀疑在改变栖息地之前趋光性的迹象是灵活的还是先决条件。然而，光谱敏感性更为复杂，并且我们假设，其谱系可能部分地受到祖先的限制，而不是完全适应现代/当前的栖息地。假斜趾的上层鱼类底栖类颅骨具有与其他类颅骨相似的峰值光谱响应。 E. acutifrons（浮游类类拟螺杆菌）的峰值光谱响应类似于光适应的T. biminiensis。 E. acutifrons表现出取决于光谱的正或负光响应，这是在其他strategy足类动物中未观察到的双重策略，但可能有效地维持垂直位置。我们建议一个约束敏感性假说，其中祖先的栖息地可能会影响现代反应的程度和性质。

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    《Marine biology》 |2017年第1期|26.1-26.13|共13页
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    Ma Xiao; Johnson Kevin B.;

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    Florida Inst Technol, Dept Marine & Environm Syst, 150 West Univ Blvd, Melbourne, FL 32901 USA;

    Florida Inst Technol, Dept Marine & Environm Syst, 150 West Univ Blvd, Melbourne, FL 32901 USA;

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