Ontogenic phototactic behaviors of larval stages in intertidal barnacles
Ontogenic phototactic behaviors of larval stages in intertidal barnacles
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DOI：
10.1007/s10750-021-04744-1
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发表时间：
2021-11-01
期刊：
影响因子：
2.6
通讯作者：
Satuito，Cyril Glenn
中科院分区：
文献类型：
--
作者：
Kim，Hee-Jin;Araki，Takumi;Satuito，Cyril Glenn
在潮间带藤壶幼体的发育过程中，无节幼体阶段I和II(NI和II)的幼虫只有一只无节体眼，之后在无节幼体VI(NVI)和鲤鱼阶段发育出额外的一对复眼。这些眼睛表现出与光波长有关的吸光度；其中最高吸光度在550到600毫微米之间。在6个波长(375、470、515、525、660和735 nm)和3个光强(5、15和25 GW/m2)的光照下，测定了每个阶段的趋光性，但735 nm处理在25、50和100 GLx的光照下除外。在所评估的光照条件下，Ni&II幼虫没有表现出明显的趋光性。NVI和鲤鱼在所评估的光照条件下表现出很强的正趋光性，但在375W/m2和15W/m2的375 nm下检测到负趋光性。此外，还考察了在375nm3个光强下，以及在其他5个波长25uW/m2或100ulx光强下，苏铁虫的沉降行为。最高沉降率和最低沉降率分别出现在470 nm和375 nm处。这些结果为潜在地决定藤壶幼虫分布的光反应机制提供了有价值的见解。
During larval development of the intertidal barnacleFistulobalanus albicostatus, larvae in the naupliar stages I and II (NI&II) possess a single naupliar eye, and later develop additional pair of compound eyes in the naupliar VI (NVI) and cyprid stages. These eyes showed light wavelength-dependent absorbances; where the highest absorbance was within 550 to 600 nm. The phototaxis of each stage was determined under light irradiation at six wavelengths (375, 470, 515, 525, 660, and 735 nm) and at three intensities (5, 15, and 25 W/m2), except for the 735 nm treatment which was irradiated at 25, 50, and 100 lx. NI&II larvae showed no clear pattern of phototaxis under the assessed light conditions. NVI and cyprids exhibited strong positive phototaxis under the assessed light conditions, except under 375 nm at 5 and 15 W/m2where negative phototaxis was detected. Furthermore, the settlement behavior of cyprids was examined under 375 nm at the three intensities, and under the other five wavelengths at 25 W/m2or 100 lx. The highest and lowest rates of settlement occurred at 470 and 375 nm, respectively. The results provide a valuable insight into the light-response mechanisms that potentially determine the distribution of barnacle larvae.