The logic of skipped spawning in fish
The logic of skipped spawning in fish
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DOI：
10.1139/f05-210
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发表时间：
2006-01-01
影响因子：
2.4
通讯作者：
Dieckmann, U
中科院分区：
文献类型：
--
作者：
Jorgensen, C;Ernande, B;Dieckmann, U
性成熟的鱼跳过繁殖，特别是对恶劣条件的反应，在许多物种中都有记录。我们介绍了一个能量分配生活史模型的结果，该模型基于东北北极大西洋鳕鱼(Gadus Morhua)的种群，阐明了跳过产卵的潜在逻辑。该模型预测，跳过产卵是一种常规现象，高达30%的性成熟生物体跳过产卵。如果预期的未来生殖产出收益(按存活率折算)超过了本年度的预期生殖成功，则应跳过产卵。跳过产卵最常见的情况是：(1)在潜在的第二次产卵者中；(2)在生命早期；(3)产卵场的捕捞死亡率高；(4)在摄食场的捕捞死亡率低；(5)自然死亡率低；以及(6)与迁徙和产卵有关的能量和死亡成本高。当食物供应增加(更好的生长机会)和减少(性腺发育的能量太少)时，鳕鱼更经常跳过产卵，这种模式与死亡率相互作用。我们得出结论，跳过产卵可能比认识到的更普遍，并强调了对种群-招募关系的理解的潜在后果。
That sexually mature fish skip reproduction, especially in response to poor condition, has been documented in many species. We present results from an energy-allocation life history model that shed light on the underlying logic of skipped spawning, based on the Northeast Arctic stock of Atlantic cod (Gadus morhua). The model predicts that skipped spawning is a regular phenomenon, with up to 30% of the sexually mature biomass skipping spawning. Spawning should be skipped if the expected future gain in reproductive output, discounted by survival, more than balances the expected reproductive success the current year. Skipped spawning was most common (i) among potential second-time spawners and (ii) early in life, (iii) when fishing mortality at the spawning grounds was high, (iv) when fishing mortality at the feeding grounds was low, (v) when natural mortality was low, and (vi) when the energetic and mortality costs associated with migration and spawning were high. Cod skipped spawning more often when food availability was both increased (opportunities for better growth) and decreased (too little energy for gonad development), and this pattern interacted with mortality rate. We conclude that skipped spawning may be more widespread than appreciated and highlight potential consequences for the understanding of stock-recruitment relationships.