Berg Florian, Slotte Aril, Johannessen Arne, Kvamme Cecilie, Clausen Lotte Worsøe, Nash Richard D M
Institute of Marine Research (IMR), Nordnes, Bergen, Norway.
University of Bergen, Department of Biology, Bergen, Norway.
PLoS One. 2017 Oct 30;12(10):e0187374. doi: 10.1371/journal.pone.0187374. eCollection 2017.
The population structure of Atlantic herring (Clupea harengus) from 13 local, coastal and offshore areas of the North Sea, Skagerrak, Kattegat and western Baltic (northeast Atlantic) was studied using biological and environmental data from 1970-2015. The objective was to identify distinct populations by comparing variability in the temporal and spatial phenotypic characteristics and evaluate the potential for mixing of populations in time and space. The populations varied in biological characteristics such as mean vertebral counts (VS), growth and maturity ogives. Generalized additive models indicated temporally stable VS in the North Sea and western Baltic, whereas intra-annual temporal variation of VS occurred in other areas. High variability of VS within a population was not affected by environmental factors such as temperature and salinity. Consequently, seasonal VS variability can be explained by the presence or absence of herring populations as they migrate between areas. The three main populations identified in this paper correspond to the three managed stocks in this area: Norwegian spring spawners (NSS), western Baltic spring spawners (WBSS) and North Sea autumn spawners (NSAS). In addition, several local populations were identified in fjords or lakes along the coast, but our analyses could not detect direct mixing of local populations with the three main populations. Our results highlight the importance of recognizing herring dynamics and understanding the mixing of populations as a challenge for management of herring.
利用1970年至2015年的生物学和环境数据，对来自北海、斯卡格拉克海峡、卡特加特海峡和波罗的海西部（东北大西洋）13个当地、沿海和近海区域的大西洋鲱（Clupea harengus）的种群结构进行了研究。目的是通过比较时间和空间表型特征的变异性来识别不同的种群，并评估种群在时间和空间上混合的可能性。种群在生物学特征上存在差异，如平均脊椎骨数（VS）、生长和成熟曲线。广义相加模型表明，北海和波罗的海西部的VS在时间上是稳定的，而其他区域则出现了VS的年内时间变化。种群内VS的高变异性不受温度和盐度等环境因素的影响。因此，季节性VS变异性可以通过鲱鱼种群在不同区域之间迁移时的存在或不存在来解释。本文确定的三个主要种群对应于该区域的三个管理种群：挪威春季产卵群体（NSS）、波罗的海西部春季产卵群体（WBSS）和北海秋季产卵群体（NSAS）。此外，在沿海的峡湾或湖泊中还确定了几个当地种群，但我们的分析未能检测到当地种群与三个主要种群的直接混合。我们的结果强调了认识鲱鱼动态和理解种群混合作为鲱鱼管理挑战的重要性。
