Flexible life history strategies of ninespine sticklebacks, genus Pungitius
Flexible life history strategies of ninespine sticklebacks, genus Pungitius
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DOI：
10.1007/s10641-005-3221-5
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发表时间：
2005-09-01
影响因子：
1.4
通讯作者：
Goto, A
中科院分区：
文献类型：
--
作者：
Arai, T;Goto, A
本文通过对日本淡水和咸水（海水）生境中九刺棘鱼（Pungitius Pungitius）和刺鱼（Pungitius tymensis）耳石中锶（Sr）和钙（Ca）浓度的测定，研究了它们的生活史。耳石的Sr:Ca比值随生境盐度的变化而变化，无论从形态特征上判断为淡水类型还是半咸水类型。生活在淡水环境中的九刺棘鱼在整个耳石中始终表现出较低的Sr:Ca比率。这些样本被鉴定为标准的淡水类型。潮间带淡水型鱼类的耳石Sr:Ca比值均高于标准淡水型，且随生长阶段的变化而波动。潮间带的半咸水型鱼类在整个耳石中Sr:Ca比值最高。本研究中，棘鱼除了具有代表性的淡水和咸淡水两种生活史类型外，其余均为溯河生活史类型。这些发现清楚地表明，九刺棘鱼具有灵活的迁徙策略，具有高度的行为可塑性，并且能够利用其生命史中各种盐度的能力。
We studied the life histories of the ninespine sticklebacks, Pungitius pungitius and Pungitius tymensis, collected from Japanese freshwater and brackish (sea) water habitats by examining the strontium (Sr) and calcium (Ca) concentrations in their otoliths. The Sr:Ca ratios in the otoliths changed with the salinity of the habitat regardless of identification as freshwater or brackish water type based on morphological characteristics. The ninespine sticklebacks living in a freshwater environment showed consistently low Sr:Ca ratios throughout the otolith. These samples were identified as a standard freshwater type. In contrast, all freshwater-type fishes collected from the intertidal zone showed higher otolith Sr:Ca ratios than those in the standard freshwater type, and the ratios fluctuated with the growth phase. All brackish water-type fishes collected in the intertidal zone showed the highest otolith Sr:Ca ratio throughout the otolith. In the present study, besides the two representative life history types of P. pungitius, i.e., freshwater and brackish water life history types, other sticklebacks had an anadromous life history type. These findings clearly indicate that the ninespine stickleback has a flexible migration strategy with a high degree of behavioral plasticity and an ability to utilize the full range of salinity in its life history.