Carbon flux to seabirds in waters with different mixing regimes in the southeastern Bering Sea
Carbon flux to seabirds in waters with different mixing regimes in the southeastern Bering Sea
复制标题
白令海东南部不同混合模式水域海鸟的碳通量
DOI：
10.1007/bf00397674
复制
发表时间：
1982
期刊：
影响因子：
2.4
通讯作者：
G. Hunt
中科院分区：
文献类型：
--
作者：
D. Schneider;G. Hunt
白令海东南部的特点是由三个混合制度，分离与50，100和200米等深线的前。浮游植物到浮游动物的转移率在沃茨的外架和斜坡（向海的100米前）相对于转移在沃茨的中间架（之间的50和100米的前线）高。为了了解这种差异是否反映在更高的营养水平上，我们计算了11种最常见的海鸟的碳通量。鸟类密度数据（1975年至1979年期间）结合每日热量需求，这是一个异速生长函数的身体大小在这个吸热组。在153 d期间（4 - 8月），最小转移到海鸟的中间架和48 mg C m-2的外架和斜坡沃茨的30 mg C m-2。营养转移到地下觅食的鸟类（剪水，海雀和小海雀）不同地区之间的差异不大。相比之下，营养转移到表面觅食的鸟类（管鼻蝠，海燕，三趾鸥）在外架和斜坡沃茨是3倍以上的中间架的沃茨。因此，就整个海鸟而言，不同区域之间的能量转移途径的差异大于总碳通量的差异。
The southeastern Bering Sea is characterized by three mixing regimes, separated by fronts associated with the 50, 100, and 200 m isobaths. Phytoplankton to zooplankton transfer-rates are high in waters over the outer shelf and slope (seaward of the 100 m front) relative to transfer in waters over the middle shelf (between the 50 and 100 m fronts). To see whether this difference is reflected at a higher trophic level, we computed carbon flux to the 11 commonest seabird species. Bird-density data (for the period 1975 through 1979) were combined with daily caloric requirement, which is an allometric function of body size in this endothermic group. Minimum transfer to seabirds over a 153 d period (April–August) was 30 mg C m-2for the middle shelf and 48 mg C m-2for outer shelf and slope waters. Trophic transfer to subsurface-feeding birds (shearwaters, murres and auklets) differed little between regions. In contrast, trophic transfer to surface-feeding birds (fulmars, petrels, and kittiwakes) in the outer shelf and slope waters was 3 times greater than in the waters of the middle shelf. Thus, for seabirds as a whole, pathways of energy transfer differed more between regions than did total carbon flux.