A Lunar Clock Changes Shielding Pigment Transparency in Larval Ocelli of Clunio marinus
A Lunar Clock Changes Shielding Pigment Transparency in Larval Ocelli of Clunio marinus
复制标题
月球时钟改变了 Clunio marinus 幼虫眼中屏蔽色素的透明度
DOI:
10.1080/07420520801904008
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发表时间:
2008
影响因子:
2.8
通讯作者:
Fleissner
中科院分区:
文献类型:
--
作者:
Fleissner;Schuchardt;Neumann;Falkenberg;Fleissner
Living in the tidal zones of the sea requires synchronization with the dominant environmental influences of tidal, solar, and lunar periodicity. Endogenous clocks anticipate those geoclimatic changes and control the respective rhythms of vital functions. But the underlying mechanisms are only partly understood. While the circadian clocks in animals are investigated employing neurobiological, molecular, and genetic approaches, clocks with a lunar periodicity have been studied with reference to development and behavior only. Sites of their pacemakers, zeitgeber receptors, and coupled endocrine components are unknown. Here, a lunar‐rhythmic change of shielding pigment transparency in the larval ocelli of the intertidal midgeClunio marinusis demonstrated for the first time as a possible access to the neurobiology of lunar timing mechanisms. We studied third instar larvae (Vigostrain) throughout the lunar cycle by light‐ and electron-microscopy as well as by x‐ray fluorescence analysis for the identification of the pigment. Moonlight detection is a prerequisite for photic synchronization of the lunar clock. The larval ocelli ofClunioputatively may function as moonlight receptors and are also controlled by the circalunar clock itself, hence being primary candidates for tracing input and output pathways of the lunar pacemaker. Additionally, the demonstration of a reversible optical change of shielding pigment transparency inCluniois a novel finding, not reported so far in any other animal species, and reveals a mechanism to enhance photosensitivity under the condition of very dim light. It represents a remarkable change of a sense organ from an imaging device to a radiometer. Its restriction to the developmental stage susceptible to lunar timing elucidates a unique sensory strategy evolved at the level of sensory input. It also raises basic questions about the biochemistry of optically active pigments, like melanin, and their intracellular control.
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影响因子:
4
作者:
D. Neumann
通讯作者:
D. Neumann
DOI:
--
发表时间:
1991
期刊:
影响因子:
--
作者:
D. Neumann;K. Spindler
通讯作者:
K. Spindler
影响因子:
3.5
作者:
D. Neumann
通讯作者:
D. Neumann
影响因子:
--
作者:
D. Neumann
通讯作者:
D. Neumann
DOI:
--
发表时间:
1974
期刊:
Zoophysiology and Ecology
影响因子:
--
作者:
A. E. Needham
通讯作者:
A. E. Needham