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Occurrence of the siphonophoreMuggiaea atlanticain Scottish coastal waters: source or sink?
Journal of Plankton Research ( IF 2.1 ) Pub Date : 2016-11-25 , DOI: 10.1093/plankt/fbw082
Michael Blackett 1, 2 , Cathy H Lucas 1 , Katherine Cook 3 , Priscilla Licandro 2
Affiliation  

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.

中文翻译:

虹吸虫Muggiaea atlanticain 苏格兰沿海水域的出现:源头还是汇?

我们应用源汇动力学的概念来调查最近(1999-2013 年)苏格兰沿海水域虹吸虫 Muggiaea atlantica 出现的增加。我们的目的是确定这种变化是代表常住人口(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(“来源”先决条件),这表明对移民的依赖(“沉没”先决条件)。使用变异划分,我们然后区分了移民的排他性影响 [由欧洲斜坡电流 (ESC) 索引] 和本地生产(由本地海水温度和食物供应索引)。在西海岸(Loch Ewe),物种丰度的年际变化取决于,按重要性增加的顺序: (i) 合适的当地环境条件(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,Loch Ewe 是 M. atlantica 的汇栖息地。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。对于这两个地方,我们建议冬季低温阻止了越冬,因此需要每年通过移民重新殖民。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。对于这两个地方,我们建议冬季低温阻止了越冬,因此需要每年通过移民重新殖民。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。对于这两个地方,我们建议冬季低温阻止了越冬,因此需要每年通过移民重新殖民。
更新日期:2016-11-25
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