Spatial Modeling of Calanus finmarchicus and Calanus helgolandicus: Parameter Differences Explain Differences in Biogeography
Spatial Modeling of Calanus finmarchicus and Calanus helgolandicus: Parameter Differences Explain Differences in Biogeography
复制标题
finmarchicus 和 helgolandicus 的空间建模：参数差异解释生物地理学的差异
DOI：
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发表时间：
2016
影响因子：
3.7
通讯作者：
D. Speirs
中科院分区：
文献类型：
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作者：
R. Wilson;M. Heath;D. Speirs
北大西洋桡足类动物Calanus finmarchicus和C.helGolandicus正在向北迁移，以应对气温上升。为了预测未来的变化，需要了解它们的相对地理分布的驱动因素。为了探索这一点，我们创建了一个新的空间显式阶段结构模型，描述了它们在整个北大西洋的种群。该模型包含了对Calanus生物学研究的最新进展，包括生长、繁殖力和温度之间的U型关系，以及一个新的滞育持续时间模型。两个物种的方程是相同的，但有些参数是物种特有的。该模型使用连续浮游生物记录器调查数据进行了参数化，并使用丰度和繁殖力的时间序列进行了检验。通过假设只存在已知的种间差异和温度差异对死亡率的影响，再现了这两个物种的地理分布。我们表明，滞育能力的差异不是解释何以限制在大陆架上的原因所必需的。较小的体型和较高的越冬温度可能使越冬海龟无法实现真正的滞育。已知的差异不能解释为什么在不列颠群岛西南部只有C.helGolandicus存在。此外，在英吉利海峡的海尔戈兰迪斯的繁殖力比我们预测的要低得多。我们假设食物质量是这些物种种群动态的关键影响因素。所提出的模型框架有可能扩展到更多的水蚤物种。
The North Atlantic copepods Calanus finmarchicus and C. helgolandicus are moving north in response to rising temperatures. Understanding the drivers of their relative geographic distributions is required in order to anticipate future changes. To explore this, we created a new spatially explicit stage-structured model of their populations throughout the North Atlantic. Recent advances in understanding Calanus biology, including U-shaped relationships between growth and fecundity and temperature, and a new model of diapause duration are incorporated in the model. Equations were identical for both species, but some parameters were species-specific. The model was parameterized using Continuous Plankton Recorder Survey data and tested using time series of abundance and fecundity. The geographic distributions of both species were reproduced by assuming that only known interspecific differences and a difference in the temperature influence on mortality exist. We show that differences in diapause capability are not necessary to explain why C. helgolandicus is restricted to the continental shelf. Smaller body size and higher overwinter temperatures likely make true diapause implausible for C. helgolandicus. Known differences were incapable of explaining why only C. helgolandicus exists southwest of the British Isles. Further, the fecundity of C. helgolandicus in the English Channel is much lower than we predict. We hypothesize that food quality is a key influence on the population dynamics of these species. The modelling framework presented can potentially be extended to further Calanus species.
赫尔戈兰哲水蚤如何在多变的环境中维持种群数量？
影响因子：
4.1
作者：
Maud J
通讯作者：
Maud J