在较低温度下,一种生物控制捕食者对动物群内的捕食会减少

IF 1.8 4区 环境科学与生态学 Q2 BIODIVERSITY CONSERVATION
Arina Martin , Stella F. Uiterwaal
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引用次数: 0

摘要

多面手捕食者通过捕食各种类型的猎物在生态系统中扮演着重要的角色。尽管如此,捕食研究通常集中在捕食者消耗最多的猎物上,很少关注不太常见的猎物。此外,尽管在气候变化下温度变异性增加,但尚不清楚捕食者的觅食如何受到较冷温度的影响。在这里,我们研究了多面手狼蛛在环境温度和两个较冷的温度下对会聚瓢虫幼虫的功能反应。在农业生态系统中,狼蛛和瓢虫都可以作为害虫物种的生物控制捕食者,并可能参与野外捕食,但瓢虫在野生狼蛛的饮食中似乎并不常见。我们提供了巴尔的摩蜘蛛在低温条件下捕食聚角蛛的证据,但发现这种蜘蛛在较低温度和较低幼虫密度下捕食聚角蛛幼虫的可能性降低。我们进一步表明,较低的温度降低了空间清除率,导致低猎物密度下的觅食率降低。我们的研究结果对生物防治计划和我们对气候变化下捕食者-猎物相互作用的理解具有重要意义,并且我们强调需要对不常被消耗的猎物进行功能响应评估。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Intraguild predation by a biocontrol predator is reduced at lower temperatures
Generalist predators play important roles in ecosystems by consuming various prey types. Despite this, predation studies often focus on a predator's most consumed prey, with limited attention given to predation on less common prey. In addition, despite increased temperature variability under climate change, it is unclear how predator foraging is affected by colder temperatures. Here, we examine the functional response of the generalist wolf spider Hogna baltimoriana on Hippodamia convergens ladybeetle larvae at an ambient and two colder temperatures. In agroecosystems, both wolf spiders and ladybeetles can act as biocontrol predators of pest species and may engage in intraguild predation, yet ladybeetles appear to be uncommon in wild wolf spiders' diets. We provide evidence of intraguild predation by H. baltimoriana on H. convergens across cold temperatures but find that the likelihood of this spider foraging on H. convergens larvae is reduced at lower temperatures and with a lower larva density. We further show that colder temperatures reduce space clearance rate, resulting in decreased foraging rates at low prey densities. Our results have important implications for biocontrol programs and our understanding of predator-prey interactions under climate change, and we highlight the need for functional responses to be evaluated on less commonly consumed prey.
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来源期刊
Food Webs
Food Webs Environmental Science-Ecology
CiteScore
2.80
自引率
5.90%
发文量
42
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