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Spatial and temporal heterogeneity of the cod spawning environment in the Bornholm Basin, Baltic Sea

机译：波罗的海博恩霍尔姆盆地鳕鱼产卵环境的时空异质性

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摘要

The present study quantifies the spatial heterogeneity of the environmental conditions associated with successful spawning by cod Gadus morhua in the Bornholm Basin. Quarterly means from 1989 to 2003 of the thickness of reproductive volume that enabled egg survival indicate that most favourable spawning conditions were located in the central area, inside the 80 m isobath. On average, spatial patterns were similar in the second and third quarters, but with overall lower thicknesses of reproductive volume and less horizontal extension of conditions suitable for egg survival in the third quarter. The observed basin-wide variation in thickness of reproductive volume and oxygen content inside this volume can result in marked horizontal differences in oxygen-related egg mortality, especially during stagnation years. The spawning habitat selected by adult Baltic cod in the Bornholm Basin was characterised by comparing data on egg abundance with environmental variables measured concurrently with egg collection. A clear preference for spawning at locations in the deep basin is evident after both inflow events, as well as for stagnation periods. In consequence, the closed area for fishing implemented in the Bornholm Basin during the main spawning periods from 1995 to 2003, although located in the northern centre of the basin, did not necessarily ensure undisturbed spawning in stagnation years.
机译：本研究量化了与博恩霍尔姆盆地鳕鱼Gadus morhua成功产卵相关的环境条件的空间异质性。从1989年至2003年每季可繁殖卵厚度的平均数（能够使卵得以存活）表明，最有利的产卵条件位于等深线80 m的中央区域。平均而言，第二季度和第三季度的空间格局相似，但在第三季度中，总体上较低的生殖体积厚度和较少水平延伸的条件适合于卵的存活。在整个盆地范围内观察到的生殖容积厚度和其中的氧气含量变化会导致与氧气有关的卵死亡率产生明显的水平差异，尤其是在停滞期。伯恩霍尔姆盆地的成年波罗的海鳕鱼选择的产卵栖息地的特征是将卵丰度数据与收集卵同时测量的环境变量进行比较。在两次流入事件以及停滞期之后，显然都倾向于在深海盆地的某些地方产卵。因此，尽管博恩霍尔姆盆地位于产卵区的北部中心，但在1995年至2003年的主要产卵期实施了禁渔区，但这不一定能确保停滞年份产卵不受干扰。

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