浊度对三刺icklebacks(Gasterosteus aculeatus)觅食行为的影响

IF 2.1 3区 农林科学 Q2 FISHERIES Fishes Pub Date : 2023-12-16 DOI:10.3390/fishes8120609
Lasse Lange Jensen, Thomas Bjørn, Andreas Hein Korsgaard, C. Pertoldi, Niels Madsen
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引用次数: 0

摘要

人类活动增加了全球沿海海洋环境的浑浊度,富营养化尤其是造成浑浊的原因。浊度是水中悬浮物对光的散射和吸收的测量值。浑浊度的增加会影响视觉捕食者,并影响群落结构和整个生态系统。三刺粘背鱼(Gasterosteus aculeatus)是北半球太平洋和大西洋的广布物种。它是一种视觉捕食者,因此非常适合研究浑浊度增加对觅食行为和活动的影响。本研究使用的棒背鱼来自北海海洋馆的一个水族箱。它们已在水族箱中生活了约两个月,最初是在一个高度富营养化的海洋峡湾系统中采集的。它们被单独放在一个观察水族箱中,喂食磷虾,给它们 10 分钟时间觅食,并用摄像机观察。通过对录像进行分析,研究棍棒鱼的捕食行为。实验重复了四种不同的浊度处理方法,平均浊度从 0.034 到 10 NTU(浊度单位)不等。膨润土被用作增加浊度的物质。在浊度处理之间,观察到觅食行为和活动有明显的统计学差异。随着浊度的增加,试验对象对猎物的扑咬次数减少,进食潜伏期延长。此外,随着浊度的增加,它们的活动量也减少了。根据摄食潜伏期变化估算的行为不稳定性随着浊度的增加而增加,但在最高浊度值时有所降低。我们的研究表明,浊度增加的事件会影响三刺鱼的行为,也可能会影响其它类似的视觉捕食者。
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Influence of Turbidity on Foraging Behaviour in Three-Spined Sticklebacks (Gasterosteus aculeatus)
Anthropogenic activities increase turbidity in coastal marine environments globally, and turbidity is particularly caused by eutrophication. Turbidity is a measurement of the scattering and absorption of light by suspended matter in water. An increase in turbidity influences visual predators and affects community structures and whole ecosystems. The three-spined stickleback (Gasterosteus aculeatus) is a widespread species in the northern hemispheric Pacific and Atlantic oceans. It is a visual predator and, therefore, a very well-suited species for studying the effects of increasing turbidity on foraging behaviour and activity. Sticklebacks used for this study were from an aquarium in the North Sea Oceanarium. They have been in the aquarium for around two months and were originally collected in a highly eutrophicated marine fjord system. They were individually placed in an observation aquarium, fed with krill, given 10 min to forage, and observed by video cameras. The video films were analysed to study stickleback predation behaviour. Experiments were repeated with four different turbidity treatments, ranging from a mean of 0.034 up to 10 NTU (nephelometric turbidity unit). Bentonite clay was used as a turbidity-increasing substance. A statistically significant difference in foraging behaviour and activity between the turbidity treatments was observed. The test subjects were found to lunge less for prey and had a higher feeding latency with increasing turbidity. Additionally, they were less active with increasing turbidity. The behavioural instability estimated as a variation in feeding latency increased with increasing turbidity but decreased at the highest turbidity value. Our study indicates an effect of turbidity-increasing events on the behaviour of the three-spined stickleback and potentially also other similar visual predators.
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Fishes
Fishes Multiple-
CiteScore
1.90
自引率
8.70%
发文量
311
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