当地的猎物密度和空间重叠对温带海洋生态系统中掠食强度的影响较弱
Max Lindmark1, Christopher A Griffiths1, Valerio Bartolino1
1Department of Aquatic Resources, Institute of Marine Research, Swedish University of Agricultural Sciences, Lysekil, Sweden.
概括
海洋生态系统的动态是复杂的. 这项关于波罗的海大西洋鱼的研究表明,捕食者和猎物的结合与海性猎物的结合比预期的要弱,这会影响渔业管理.
科学领域:
- 海洋生态海洋生态学
- 渔业 科学 渔业 科学
- 生态系统动力学 生态系统动力学
背景情况:
- 了解捕食者-猎物动态对于基于生态系统的管理至关重要.
- 热带模型通常假定紧密的合,但移动捕食者的经验证据是有限的.
- 评估对一般鱼类捕食者的猎物可用性影响需要时空空间数据.
研究的目的:
- 调查当地猎物密度与大西洋鱼养模式之间的关联.
- 量化空间时空捕食者-猎物重叠和波罗的海的捕食指数.
- 为了评估鱼与其关键猎物物种之间的合的强度.
主要方法:
- 利用了大西洋鱼 (Gadus morhua) 三十年的空间分辨生物量和胃含量数据.
- 分析了关键猎物的生物质数据:鱼,鱼和Saduria entomon.
- 采用地理统计学通用线性混合效应模型来估计掠夺和重叠指数.
主要成果:
- 大西洋鱼和猎物的时空重叠在过去的三十年中显著减少.
- 猎物的可用性与鱼胃的含量相关,仅针对Saduria entomon,而不是鱼或鱼.
- 人口级掠食和空间重叠之间的正相关性仅在Saduria发现.
结论:
- 鱼捕食的可用性显示,与鱼捕食的联系比预期的要弱,挑战了紧密结合的假设.
- 由于范围的变化,捕食者和猎物的重叠减少可能会削弱生态系统的相互作用.
- 这些发现对于完善多物种模型和基于生态系统的渔业管理策略至关重要.
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