Potential effects of artificial light associated with anthropogenic infrastructure on the abundance and foraging behaviour of estuary-associated fishes
Potential effects of artificial light associated with anthropogenic infrastructure on the abundance and foraging behaviour of estuary-associated fishes
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DOI：
10.1111/1365-2664.12024
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发表时间：
2013-02-01
影响因子：
5.7
通讯作者：
Naesje, Tor F.
中科院分区：
文献类型：
--
作者：
Becker, Alistair;Whitfield, Alan K.;Naesje, Tor F.
城市化已被确定为对生物多样性的全球威胁。在未来几十年，包括河口在内的沿海地区的人口增长预计将大幅增加，这将导致码头、码头和游艇码头等基础设施的激增。这种基础设施通常与人工夜间照明有关，但这些非自然照明制度对沿海生态系统中鱼类的影响尚不清楚。我们进行了新颖的，夜间调查的鱼类群落直接邻近的人工结构使用声学相机（didson）。通过操纵人工照明条件（照明“或关闭”），我们测试了人工光对鱼类丰度和行为的影响。在两种光处理之间观察到鱼类丰度的明显差异。大型食肉动物（> 500毫米TL）的出现增加时，人工照明。这些鱼的行为也不同，因为他们试图保持其位置内的照明区域邻近相关的人为结构。当灯光亮起时，鱼群的数量也会增加，这可能是因为人工照明创造的条件有利于食鱼动物，因为它们集中了猎物，增强了视觉捕食者的觅食能力。这有可能造成城市河口和沿海沃茨内鱼类种群自上而下的非自然调节。合成与应用。作为一个积极的趋光性反应的结果，这项研究的结果表明，人造光往往与人造结构有可能改变城市河口生态系统内的鱼类群落，创造最佳条件的捕食者。未来的沿海发展应考虑照明对水生生物群落的生态影响。我们建议尽量减少沿海基础设施周围的照明，并考虑使用穿透水有限的红灯。
Urbanization has been identified as a global threat to biodiversity. Human population growth in coastal areas, including estuaries, is expected to increase considerably in coming decades, which will result in a proliferation of infrastructure such as jetties, wharfs and marinas. This infrastructure is often associated with artificial night lighting, yet the implications of these unnatural lighting regimes for the fish fauna in coastal ecosystems are unknown. We conducted novel, night-time surveys of the fish community directly adjacent to an artificial structure using an acoustic camera (didson). By manipulating the artificial lighting conditions (lighting either on' or off'), we tested the effects of artificial light on fish abundance and behaviour. Clear differences in the abundance of fish were observed between the two light treatments. The occurrence of large-bodied predators (>500mm TL) increased when the artificial lights were on. The behaviour of these fish also differed as they attempted to maintain their position within the illuminated area adjacent to the associated anthropogenic structure. The abundance of small shoaling fish also increased when the lights were on. It is possible that the conditions created by artificial lighting benefit piscivores through the concentration of prey and enhanced foraging capabilities in the case of visual predators. This has the potential to create unnatural topdown regulation of fish populations within urban estuarine and coastal waters. Synthesis and applications. As a consequence of a positive phototaxic response, the findings of this study suggest that artificial light often associated with man-made structures has the potential to alter fish communities within urban estuarine ecosystems by creating optimal conditions for predators. Future coastal developments should consider the ecological implications of lighting on aquatic communities. We recommend that lighting be minimized around coastal infrastructure and the use of red lights, which have limited penetration though water, be considered.