...
首页> 外文期刊>Ecological Applications >Linking removal targets to the ecological effects of invaders: a predictive model and field test
【24h】

Linking removal targets to the ecological effects of invaders: a predictive model and field test

机译:将清除目标与入侵者的生态影响联系起来:一种预测模型和现场试验

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       

摘要

Species invasions have a range of negative effects on recipient ecosystems, and many occur at a scale and magnitude that preclude complete eradication. When complete extirpation is unlikely with available management resources, an effective strategy may be to suppress invasive populations below levels predicted to cause undesirable ecological change. We illustrated this approach by developing and testing targets for the control of invasive Indo-Pacific lionfish (Pterois volitans and P. miles) on Western Atlantic coral reefs. We first developed a size-structured simulation model of predation by lionfish on native fish communities, which we used to predict threshold densities of lionfish beyond which native fish biomass should decline. We then tested our predictions by experimentally manipulating lionfish densities above or below reef-specific thresholds, and monitoring the consequences for native fish populations on 24 Bahamian patch reefs over 18 months. We found that reducing lionfish below predicted threshold densities effectively protected native fish community biomass from predation-induced declines. Reductions in density of 25-92%, depending on the reef, were required to suppress lionfish below levels predicted to overconsume prey. On reefs where lionfish were kept below threshold densities, native prey fish biomass increased by 50-70%. Gains in small (<6 cm) size classes of native fishes translated into lagged increases in larger size classes over time. The biomass of larger individuals (>15 cm total length), including ecologically important grazers and economically important fisheries species, had increased by 10-65% by the end of the experiment. Crucially, similar gains in prey fish biomass were realized on reefs subjected to partial and full removal of lionfish, but partial removals took 30% less time to implement. By contrast, the biomass of small native fishes declined by >50% on all reefs with lionfish densities exceeding reef-specific thresholds. Large inter-reef variation in the biomass of prey fishes at the outset of the study, which influences the threshold density of lionfish, means that we could not identify a single rule of thumb for guiding control efforts. However, our model provides a method for setting reef-specific targets for population control using local monitoring data. Our work is the first to demonstrate that for ongoing invasions, suppressing invaders below densities that cause environmental harm can have a similar effect, in terms of protecting the native ecosystem on a local scale, to achieving complete eradication.
机译:物种入侵对受体生态系统有一系列负面影响,许多入侵的规模和规模使彻底根除成为可能。当利用现有管理资源不可能完全灭绝时,有效的策略可能是将入侵种群抑制在预计会造成不良生态变化的水平以下。我们通过开发和测试控制西大西洋珊瑚礁上的侵入性印度太平洋太平洋l鱼(Pterois volitans和P. miles)的目标来说明这种方法。我们首先建立了大小结构的simulation鱼在本地鱼类群落上捕食的模拟模型,该模型用于预测l鱼的阈值密度,超过该阈值密度,本地鱼类的生物量应下降。然后,我们通过实验操作高于或低于礁石特定阈值的l鱼密度,并在18个月内监视24个巴哈马斑礁对本地鱼类种群造成的后果,从而检验了我们的预测。我们发现将reducing鱼降低到低于预期的阈值密度有效地保护了本地鱼类群落生物量免受捕食引起的下降。需要将密度降低25-92%(视礁石而定),以将l鱼抑制到预计过度捕食的水平以下。在l鱼保持低于阈值密度的珊瑚礁上,本地猎物的生物量增加了50-70%。随着时间的推移,小尺寸(<6厘米)本地鱼的收益转化为大规格鱼的滞后增长。到实验结束时,较大个体(总长> 15 cm)的生物量(包括具有生态意义的放牧者和具有经济意义的渔业物种)已增加了10-65%。至关重要的是,对部分和全部去除ion鱼的珊瑚礁也实现了猎物生物量的类似增长,但是部分去除所需的时间减少了30%。相比之下,在所有礁石上,小型native鱼的生物量下降了50%以上,其中fish鱼的密度超过了礁石特定阈值。在研究开始时,猎物生物量的大范围珊瑚礁间变化会影响l鱼的阈值密度,这意味着我们无法确定指导控制工作的单一经验法则。但是,我们的模型提供了一种使用本地监视数据来设置礁石特定目标进行种群控制的方法。我们的工作首次证明,对于持续不断的入侵,将入侵者控制在低于可能造成环境危害的密度之内,就其在当地范围内保护本地生态系统而言,具有完全消除的类似作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号