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首页> 外文期刊>Fisheries Research >An age-based cohort model for estimating the spawning mortality ofsemelparous cephalopods with an application to per-recruitcalculations for the northern shortfin squid, Illex illecebrosus
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An age-based cohort model for estimating the spawning mortality ofsemelparous cephalopods with an application to per-recruitcalculations for the northern shortfin squid, Illex illecebrosus

机译：一种基于年龄的队列模型，用于估计异头足类的产卵死亡率，并将其应用于北部短鳍乌贼Illex illecebrosus的按招募计算

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摘要

Semelparity is a common life history characteristic of squids and other cephalopod species, yet most cephalopod stock assessment models assume a constant natural mortality rate that does not account for post-spawning mortality. Since older individuals are more likely to spawn, natural mortality is likely to increase with age. We provide a method of estimating the spawning mortality rate of adult semelparous cephalopods, using Illex illecebrosus as an example. The model estimates the rates of maturation and spawning mortality as a continuous function of age for an unfished cohort of females. Model estimates of natural mortality were much higher than those typically assumed for semelparous cephalopod stocks under a constant natural mortality rate (0.02-0.06 week super(-1)). Maturation and spawning mortality rates from the model were incorporated into per-recruit models designed to account for the semelparous life history of cephalopods to illustrate the effects of these parameters on biological reference point estimates. Biological reference point estimates were fairly insensitive to the assumed level of non-spawning natural mortality. However, neglecting to account for ageing error in natural mortality rate estimates resulted in a substantial underestimation of reference points. The model produces biologically plausible results and should be applicable to a wide range of semelparous cephalopod stocks.
机译：稀疏性是鱿鱼和其他头足类物种的共同生活史特征，但是大多数头足类种群评估模型均假定恒定的自然死亡率，这并不代表产卵后的死亡率。由于年龄较大的人更有可能产卵，因此自然死亡率可能会随着年龄的增长而增加。我们提供了一种方法，以Ilelex illecebrosus为例，估计成年的有节状头足类的产卵死亡率。该模型估计了未捕捞女性群体的成熟率和产卵死亡率与年龄的连续关系。在自然死亡率不变的情况下（0.02-0.06周super（-1）），自然死亡率的模型估计值远远高于通常假定的粗mel头足类动物的估计值。该模型的成熟度和产卵死亡率被合并到每个招聘模型中，这些模型旨在说明头足类动物的生活史，以说明这些参数对生物学参考点估计的影响。生物参考点估计值对假定的非产卵自然死亡率水平相当不敏感。但是，在自然死亡率估算中忽略了老龄化误差，导致参考点大大低估。该模型产生生物学上合理的结果，并且应适用于广泛的粗粒状头足类种群。

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