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Use of pelagic prey subsidies by demersal predators in rocky reefs:insight from movement patterns of lingcod

机译:水下捕食者对岩石礁中上层捕食者的使用:从灵哥鱼的运动方式看

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摘要

Allochthonous subsidies of energy and nutrients can affect community structure in patchy marine habitats, including rocky reefs, and their ecological consequences may depend on the mechanism of energy transfer. Lingcod (Ophiodon elongatus) are demersal predators that trophi-cally link nearshore rocky reefs with offshore pelagic habitats through consumption of pelagic fishes. We quantified lingcod habitat use and movement patterns to make inferences about the temporal and spatial conditions under which lingcod may acquire pelagic prey. Lingcod maintained small home ranges (21,272 ± 13,630 m~2) within a rocky reef in the San Juan Archipelago, Washington; eight of nine individuals used rocky habitat exclusively. Depths occupied by lingcod (0-50 m) coincided with pelagic fish distribution on the rocky reef; however, diel patterns in lingcod activity varied inversely with occurrence of pelagic fishes on the reef. Our findings suggest that the pelagic subsidy to lingcod is not strongly mediated through directed off-reef foraging by lingcod.
机译:能量和养分的异质性补贴会影响斑驳海洋生境(包括礁石)中的群落结构,其生态后果可能取决于能量转移的机制。 Lingcod(Ophiodon elongatus)是海底掠食者,通过食用中上层鱼类,在营养上与近岸岩石礁和近海中上层生境联系在一起。我们量化了lingcod栖息地的使用和移动方式,以推断lingcod可能在哪个时间和空间条件下获得远洋捕食。 Lingcod在华盛顿州圣胡安群岛的一块礁石中维持了小的居所范围(21,272±13,630 m〜2); 9个人中有8个人专门使用了岩石栖息地。 lingcod(0-50 m)所占据的深度与礁石上的上层鱼类分布相吻合;然而,灵芝活动中的迪尔模式与珊瑚礁上浮游鱼类的发生成反比。我们的发现表明,lingcod的远洋补贴不是通过lingcod定向进行礁外觅食而强烈介导的。

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  • 来源
    《Marine biology》 |2011年第2期|p.471-483|共13页
  • 作者单位

    School of Aquatic and Fishery Sciences,University of Washington,Box 355020, Seattle, WA 98195, USA;

    School of Aquatic and Fishery Sciences,University of Washington,Box 355020, Seattle, WA 98195, USA;

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