Otolith-check formation and accelerated growth associated with sex change in an annual protogynous tropical fish
Otolith-check formation and accelerated growth associated with sex change in an annual protogynous tropical fish
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一年生雌性热带鱼性别变化相关的耳石检查形成和加速生长
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
M. McCormick
中科院分区：
文献类型：
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作者：
S. Walker;M. McCormick
利用耳石微观结构和性腺组织学研究了白桦鲈生长与性别变化的关系。研究还探讨了以前的生长历史对变性时间的影响以及哪些个体进行了变性。耳石增量检验表明，白茅的最大寿命为411 d，在低纬度种群中寿命缩短。白茅属雌雄同体，在任何年龄雄性都比雌性大。矢状面横切面上突然的光学不连续或Œcheck¹被发现与性别变化有关。这种检查似乎是在变性开始时形成的。从耳石增量宽度推断，性别改变后的生长率显著增加，在一些个体中增加了一倍以上。个体在长达30 d的时间内保持加速生长，此后生长速度下降。幼虫的生长、变态时的相对大小、幼鱼的生长和雌性的生长（所有这些都是由耳石的微观结构决定的）并不影响哪些个体改变了性别，也不影响它们改变性别的时间。有证据表明，这些haremic鱼的性别变化和随后的生长加速受到它们所生活的基于尺寸的强烈社会等级制度的影响。
Growth of the haremic sandperch Parapercis cylindrica (family Pinguipedidae) was examined in relation to sex change using otolith microstructure and gonad histology. The influence of previous growth history on the timing of sex change and which individuals underwent sex change were also explored. Examination of otolith increments shows that P. cylindrica has a maximum longevity of 411 d, which is reduced in a lower latitude population. P. cylindrica is a monandric hermaphrodite, with males being larger than females at any given age. An abrupt optical discontinuity or Œcheck¹ on sagittal cross-sections was found to be associated with sex change. This check appears to be formed at the initiation of sex change. Growth rate following sex change, inferred from otolith increment widths, increased markedly and more than doubled in some individuals. Individuals retained accelerated growth for a period of up to 30 d, after which time growth rate declined. Larval growth, relative size at metamorphosis, juvenile growth, and female growth (all determined from otolith microstructure), did not influence which individuals changed sex, or the timing of their sex change. Evidence suggests that sex change and subsequent growth acceleration in these haremic fish are influenced by the strong size-based social hierarchy in which they live.