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Generalised linear modelling of fecundity at length in southern rock lobsters, Jasus edwardsii

机译：南部龙虾Jasus edwardsii的繁殖力的广义线性建模

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摘要

Accurate fecundity estimates are central to population modelling of reproductive status and egg production in a fishery. Southern rock lobster (Jasus edwardsii) fisheries are managed with the consideration of performance measures based on the level of current egg production relative to the unfished stock. Egg production is a function of the size at the onset of maturity, the size structure of the stock, and the fecundity at length of lobsters. Fecundity at length of the Tasmania stock of J. edwardsii has not been reported previously and was estimated from seven sites around Tasmania. Data were analysed by classical linear regression and also generalised linear models (GLM) with gamma and Poisson distributions. GLM with a gamma distribution produced the best fit and did not require a correction factor to generate a model on the linear scale. Individual fecundity ranged from 43,918 to 660,156 and could be predicted from carapace length according to the equation F= -1.707 + 2.969 (log length). The coefficient of length approximated three, implying the fecundity at length relationship is cuboidal. Despite the spatial heterogeneity in reproductive parameters in this fishery, the inclusion of spatial information and egg development stage into the analysis only explained an additional 1% of the variance in fecundity. Thus, it appears valid to apply the relationship across the fishery without spatial separation.
机译：准确的繁殖力估算对于渔业中生殖状况和产蛋量的种群建模至关重要。在管理南部龙虾（Jasus edwardsii）渔业时，应根据当前卵产量相对于未捕捞种群的水平，根据性能指标进行管理。产蛋量取决于成熟时的大小，种群的大小结构以及龙虾的繁殖力。塔斯马尼亚岛塔斯马尼亚种群的产卵量以前没有报道，据塔斯马尼亚岛周围的七个地点估计。通过经典线性回归以及具有gamma和Poisson分布的广义线性模型（GLM）对数据进行了分析。具有伽玛分布的GLM产生了最佳拟合，并且不需要校正因子即可生成线性比例的模型。个体繁殖力范围为43,918至660,156，可以根据等式F = -1.707 + 2.969（对数长度）从甲壳长度进行预测。长度系数近似为3，这意味着在长度关系上的生殖力是立方形的。尽管该渔业繁殖参数在空间上存在异质性，但在分析中纳入空间信息和卵子发育阶段仅能解释繁殖力变化的1％。因此，在没有空间分隔的情况下跨渔业应用这种关系似乎是有效的。

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  • 来源
    《Marine biology》 |2009年第9期|1941-1947|共7页
  • 作者

    Bridget S. Green; Caleb Gardner; Robert B. Kennedy;

  • 作者单位

    Tasmanian Aquaculture and Fisheries Institute, Marine Research Laboratories, University of Tasmania, Private Bag 49, Hobart, TAS 7001, Australia;

    Tasmanian Aquaculture and Fisheries Institute, Marine Research Laboratories, University of Tasmania, Private Bag 49, Hobart, TAS 7001, Australia;

    Commission for the Conservation of Southern Bluefin Tuna, PO Box 37, Deakin West, Canberra, ACT 2600, Australia;

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