Patterns and drivers of megabenthic secondary production on the Barents Sea shelf
Patterns and drivers of megabenthic secondary production on the Barents Sea shelf
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DOI：
10.3354/meps11662
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发表时间：
2016-03-21
影响因子：
2.5
通讯作者：
Brey, Thomas
中科院分区：
文献类型：
--
作者：
Degen, Renate;Jorgensen, Lis Lindal;Brey, Thomas
巨型底栖生物在北极大陆架的总体能量流动中发挥着重要作用，但关于大型底栖生物在大空间尺度上的次级生产的信息却很少。在这里，我们首次估计了整个巴伦支海陆架的大型底栖生物的次级生产，通过应用基于物种的经验模型，从挪威-俄罗斯联合生态系统调查的广泛数据集。空间格局和关系进行了分析，在一个地理信息系统。观察到的生产模式背后的环境驱动因素进行了识别，通过应用普通最小二乘回归模型。地理加权回归（GWR）被用来检查的变化关系的次级生产力和环境的货架范围内。显着更高的megabenthic二次生产被发现在东北部，季节性冰覆盖的巴伦支海地区比永久无冰西南。与所观察到的格局有显著关系的环境参数是底层温度和盐度、海冰覆盖、新的初级生产力、拖网压力和底层流速。GWR被证明是一个多功能的工具，用于分析区域不同的海底次级生产及其环境驱动因素的关系（R-2 = 0.73）。观察到的模式表明，在生产性边缘冰区的领域中，紧密的水层-底栖生物耦合。冬季海冰范围的持续减少和相关的季节性冰缘点的向极运动，将使巴伦支海东北部的底栖生物次级生产力在未来明显下降。
Megabenthos plays a major role in the overall energy flow on Arctic shelves, but information on megabenthic secondary production on large spatial scales is scarce. Here, we estimated for the first time megabenthic secondary production for the entire Barents Sea shelf by applying a species-based empirical model to an extensive dataset from the joint Norwegian-Russian ecosystem survey. Spatial patterns and relationships were analyzed within a GIS. The environmental drivers behind the observed production pattern were identified by applying an ordinary least squares regression model. Geographically weighted regression ( GWR) was used to examine the varying relationship of secondary production and the environment on a shelf-wide scale. Significantly higher megabenthic secondary production was found in the northeastern, seasonally ice-covered regions of the Barents Sea than in the permanently ice-free southwest. The environmental parameters that significantly relate to the observed pattern are bottom temperature and salinity, sea ice cover, new primary production, trawling pressure, and bottom current speed. The GWR proved to be a versatile tool for analyzing the regionally varying relationships of benthic secondary production and its environmental drivers( R-2 = 0.73). The observed pattern indicates tight pelagic-benthic coupling in the realm of the productive marginal ice zone. Ongoing decrease of winter sea ice extent and the associated poleward movement of the seasonal ice edge point towards a distinct decline of benthic secondary production in the northeastern Barents Sea in the future.