Occurrence of the siphonophore Muggiaea atlantica in Scottish coastal waters: source or sink?
Occurrence of the siphonophore Muggiaea atlantica in Scottish coastal waters: source or sink?
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DOI：
10.1093/plankt/fbw082
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发表时间：
2017-01
影响因子：
2.1
通讯作者：
Licandro P
中科院分区：
文献类型：
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作者：
Blackett M;Lucas CH;Cook K;Licandro P
我们应用源汇动力学的概念来调查苏格兰沿海水域最近（1999-2013年）大西洋Muggiaea发生的增加。我们的目的是确定这种变化是否代表了常住人口（即“来源”）的建立，还是依赖移民的流动人口（即“汇”）。首先，我们表明，本地生产并不总是足以解释招聘（一个“来源”先决条件），表明对移民的依赖（一个“汇”先决条件）。利用变异分区，我们区分了移民（以欧洲斜坡流（ESC）为指标）和当地生产（以当地海水温度和食物供应为指标）的排他性影响。在西海岸（Ewe湖），物种丰度的年际变化由以下因素决定：(i)适宜的当地环境条件（13%）；（ii） ESC在调节这些条件中的作用（20%）；（iii）通过ESC移民（29%）。这些结果有力地表明，Ewe湖是M. atlantica的汇栖地。然而，在东海岸（斯通黑文），我们的结果不太确定，可能是由于ESC的直接影响较小。对于这两个地点，我们认为冬季低温阻止了越冬，需要每年通过移民重新殖民化。
We applied the concept of source–sink dynamics to investigate a recent (1999–2013) increase in the occurrence of the siphonophore Muggiaea atlantica in Scottish coastal waters. Our aim was to determine whether this change represented the establishment of resident populations (i.e. “sources”), or transient populations reliant on immigration (i.e. “sinks”). First, we show that local production was not always sufficient to account for recruitment (a “source” prerequisite), suggesting reliance on immigration (a “sink” prerequisite). Using variation partitioning, we then discriminated between the exclusive effects of immigration [indexed by the European Slope Current (ESC)] and local production (indexed by local sea temperature and food availability). On the west coast (Loch Ewe), interannual variability in the species’ abundance was determined by, in order of increasing importance: (i) suitable local environmental conditions (13%); (ii) the role of the ESC in modulating these conditions (20%); and (iii) immigration via the ESC (29%). These results provided a strong indication that Loch Ewe represents a sink habitat for M. atlantica. However, on the east coast (Stonehaven) our results were less conclusive, probably due to the less direct influence of the ESC. For both locations, we suggest that low winter temperatures prevented overwintering, necessitating annual re-colonization via immigration.