Impact of duck predation on the population of Manila clam (Ruditapes philippinarum) in tidal flat

IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY
Rikuto Honda , Takehisa Yamakita , Tatsuya Ozaki , Nana Yamashita , Tomohiro Komorita
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Abstract

Ducks such as mallards (Anas platyrhynchos), have been the target of predation control, including extermination efforts, on land and in coastal regions, because they fly in colonies and prey on a wide variety of agricultural crops and marine products, including Manila clams (Ruditapes philippinarum). To date, stomach content analysis and behavioral observations have primarily been used to assess duck predation on clams. Although ducks appear to respond to water depth, their response to short-term changes in water depth (i.e., tidal height) has not been assessed in tidal flats. Therefore, a quantitative evaluation of the effects of duck predation on clams is needed to clarify the behavior of ducks on tidal flats and to conserve ducks and clams. In this study, the influence of duck predation on the clam population was investigated using anti-predation experiments on the Midorikawa River tidal flat in Ariake Bay, Kyushu, Japan. Furthermore, the relationships among water depth, duck activity, and duck flock density were investigated using a trail camera and a drone. In the anti-predation experiment during the study period, no significant difference in clam density was found between the experimental and control clam density. This study showed that duck predation may have a small impact on the Manila clam population in the tidal flats of the Midorikawa River.

Abstract Image

鸭捕食对潮滩马尼拉蛤种群的影响
野鸭(Anas platyrhynchos)等鸭子一直是陆地和沿海地区捕食控制包括灭绝努力的目标,因为它们成群飞行,捕食各种各样的农作物和海产品,包括马尼拉蛤(Ruditapes philippinarum)。迄今为止,胃内容物分析和行为观察主要用于评估鸭子捕食蛤蜊。虽然鸭子似乎对水深有反应,但它们对短期水深变化(即潮汐高度)的反应尚未在潮滩进行评估。因此,有必要定量评价鸭类捕食对蛤类的影响,以明确鸭类在滩涂上的行为,保护鸭类和蛤类。本研究在日本九州有明湾Midorikawa河滩涂进行了反捕食实验,研究了鸭捕食对蛤种群的影响。利用跟踪摄像机和无人机对鸭群密度与水深的关系进行了研究。在研究期间的反捕食实验中,实验蛤密度与对照蛤密度无显著差异。本研究表明,鸭的捕食可能对Midorikawa河潮滩的马尼拉蛤种群产生很小的影响。
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来源期刊
CiteScore
5.60
自引率
7.10%
发文量
374
审稿时长
9 months
期刊介绍: Estuarine, Coastal and Shelf Science is an international multidisciplinary journal devoted to the analysis of saline water phenomena ranging from the outer edge of the continental shelf to the upper limits of the tidal zone. The journal provides a unique forum, unifying the multidisciplinary approaches to the study of the oceanography of estuaries, coastal zones, and continental shelf seas. It features original research papers, review papers and short communications treating such disciplines as zoology, botany, geology, sedimentology, physical oceanography.
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