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首页> 外文期刊>Journal of sea research >Visual crypsis as a possible function of polymorphic shell coloration in the infaunal clam Ruditapes philippinarum
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Visual crypsis as a possible function of polymorphic shell coloration in the infaunal clam Ruditapes philippinarum

机译：视觉cry虫可能是菲律宾蛤仔蛤仔多态壳着色的可能功能

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摘要

The infaunal clam Ruditapes philippinarum exhibits highly polymorphic shell coloration, but the function of the coloration remains uncertain. Here, a hypothesis that such shell coloration functions to enhance visual crypsis (i.e., background color matching) in juveniles ( 15 mm in shell length) was tested with a combination of a field survey and laboratory experiments. Shell and background colorations were expressed as mean brightness values. Firstly, the association between shell and background brightness was investigated. For this, a field survey for two sympatric subpopulations with distinct substrates was conducted on an intertidal sandflat in western Kyushu, Japan. Secondly, the visual-crypsis hypothesis was tested experimentally using half-valve clam shells filled with paste of raw clam meat as prey and the pufferfish Takifugu niphobles as a visually hunting predator, in a tank with one to two dark-colored substrates and one light-colored substrate. The field survey showed that shell brightness significantly differed between the two sympatric subpopulations of juvenile clams and was positively associated with background brightness. The laboratory experiments indicated that prey items with comparatively light (dark) coloration on dark- (light-) colored substrate were consumed by predators more immediately and at a higher rate than in the color-matched combinations. Consequently, shell-background color matching could help juvenile clams avoid attack from visually hunting predators. The results provide a new insight into effective management planning for this clam species, creating sand habitats with a more matched coloration.
机译：软体动物蛤仔菲律宾蛤仔表现出高度多态的壳着色，但着色的功能仍不确定。在此，通过现场调查和实验室实验相结合的检验，验证了这种壳着色功能可增强幼体（壳长<15 mm）中的视觉凝结（即背景色匹配）的功能。外壳和背景色表示为平均亮度值。首先，研究了壳与背景亮度之间的关系。为此，在日本九州西部的潮间带滩涂上对两个具有不同基质的同胞亚群进行了实地调查。其次，在装满一到两个深色底物和一盏灯的水箱中，用半瓣蛤壳装满生蛤肉的糊状物作为猎物，将河豚aki粉（Takifugu Niphobles）作为视觉捕食性动物，对视觉隐窝假说进行了实验测试。色的基材。现场调查显示，两个壳蛤的同胞亚种群之间的壳亮度显着不同，并且与背景亮度成正相关。实验室实验表明，与颜色匹配的组合相比，在深色（浅色）底物上具有较浅（深色）色的猎物被捕食者更迅速且以更高的速率消耗。因此，贝壳与背景的颜色匹配可以帮助小蛤避免目视捕食者的攻击。结果为对该蛤类的有效管理计划提供了新的见解，从而创建了具有更匹配颜色的沙生境。

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