Counterillumination in the hawaiian bobtail squid, Euprymna scolopes Berry (Mollusca: Cephalopoda)
Counterillumination in the hawaiian bobtail squid, Euprymna scolopes Berry (Mollusca: Cephalopoda)
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DOI：
10.1007/s00227-003-1285-3
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发表时间：
2004-06-01
期刊：
影响因子：
2.4
通讯作者：
Nishiguchi, MK
中科院分区：
文献类型：
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作者：
Jones, BW;Nishiguchi, MK
夏威夷短尾乌贼Euprymna Scolope和发光共生菌Euprymna Scolope之间的互惠关系已被广泛用作从共物种形成和生物地理学到基因调控和致病进化的研究的模式系统。在这种联系中，发光细菌V.fecheri被安置在E.scolope的外套膜腔内的一个复杂的发光器官中。之前的假说认为，海鞘乌贼一般利用它们的费氏弧菌共生体产生的生物发光来进行反照明，这一行为通过减少轮廓来匹配向下喷出的月光来帮助鱿鱼伪装自己。这一假设仅基于鱿鱼发光器的形态，从未在实验室中对真鼻虫进行过经验检验。这里，我们提供的数据表明，随着向下射出的光强度的变化，E.scolope可以改变V.fecheri在光器官中产生的光的强度。来自发光器官的细菌生物发光与向下的光强度直接相关，这表明鞭毛杆菌个体利用和控制费氏弧菌的发光进行逆光照。
The mutualism between the Hawaiian bobtail squid Euprymna scolopes and the luminescent symbiont Vibrio fischeri has been used extensively as a model system for studies ranging from co-speciation and biogeography to gene regulation and the evolution of pathogenesis. In this association, the luminescent bacterium V. fischeri is housed in a complex light organ within the mantle cavity of E. scolopes. Prior hypotheses have assumed that sepiolid squids in general utilize the bioluminescence produced by their V. fischeri symbionts for counterillumination, a behavior that helps squid camouflage themselves by matching down-welling moonlight via silhouette reduction. This assumption, based solely on the morphology of the squid light organ, has never been empirically tested for Euprymna in the laboratory. Here, we present data demonstrating that E. scolopes can modify the intensity of light produced by V. fischeri in the light organ as down-welling light intensity changes. Bacterial bioluminescence from the light organ is directly correlated with down-welling light intensity, suggesting that E. scolopes individuals utilize and control V. fischeri luminescence for counterillumination.