Size-dependent growth tactics of a partially migratory fish before migration

Size-dependent growth tactics of a partially migratory fish before migration
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部分洄游鱼类在迁徙前依赖于体型的生长策略

DOI:
10.1007/s00442-022-05111-0
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发表时间:
2022
期刊:
影响因子:
2.7
通讯作者:
Kishida Osamu
Kishida Osamu
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Futamura Ryo;Morita Kentaro;Kanno Yoichiro;Kumikawa Shoji;Matsuoka Yuichi;Okuda Atsushi;Sugiyama Hiroshi;Takahashi Hiroyuki;Uchida Jiro;Kishida Osamu

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在许多移栖物种中,较小的移栖物种在危险的移栖过程中死亡率较高。为了尽量减少大小选择性死亡率,较小体型的移民需要加快生长速度或推迟移民时间,以在移民之前获得足够大的体型。为了测试这些预测,我们调查了依赖于大小的模式的增长率和迁移时间的少年马苏鲑鱼(Oncorhynchus masou)之前,他们的海洋迁移。我们跟踪独特标记的个人在研究人口组成的海洋移民和河流居住的居民使用标记重捕获调查和PIT标签天线阅读器系统。数据支持我们对规模依赖的增长率和迁移时间的预测。在迁出前大约6个月(即,在决定迁徙和开始迁徙之间),如果最初的体型较小,最终的迁徙者比定居者生长得更快,但对于最初体型较大的鱼来说,这种生长率的差异减小了。此外,较小的最终移民推迟迁出的时间相比,较大的个人,以达到更大的身体尺寸在河流中迁移之前。这些结果表明,在迁移过程中的大小选择性死亡率形成了大小依赖的模式,迁移前的增长在迁移的马苏鲑鱼。迁徙前的生长速度和持续时间的大小条件变化可能是迁徙动物的一种适应策略。
In many migratory species, smaller migrants suffer higher mortality rates during the risky migration. To minimize the size-selective mortality, migrants with smaller body sizes would need to accelerate growth rates or delay migration timing to attain a large enough body size prior to migration. To test these predictions, we investigated size-dependent patterns of growth rates and migration timing of juvenile masu salmon (Oncorhynchus masou) before their oceanic migration. We tracked uniquely marked individuals in a study population consisted of oceanic migrants and river-dwelling residents using mark-recapture surveys and PIT-tag antenna-reader system. Data supported our predictions about size-dependent growth rates and migration timing. For approximately 6 months before outmigration (i.e., between the decision of migration and the start of migration), eventual migrants grew more than residents if their initial size was smaller, but such a difference in growth rate diminished for fish with larger initial sizes. In addition, smaller eventual migrants delayed the timing of outmigration compared to larger individuals, to attain a larger body size in the river prior to migration. These results suggest that size-selective mortality during migration has shaped size-dependent patterns of the pre-migration growth in migratory masu salmon. Size-conditional changes in growth rate and duration of pre-migration period may be an adaptive tactic for the migratory animals.
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