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Landscape-scale distribution of nest predators and its relationship with regent honeyeater nest success
Austral Ecology ( IF 1.5 ) Pub Date : 2021-06-26 , DOI: 10.1111/aec.13075
Daniel Gautschi 1 , Robert Heinsohn 1 , Liam Murphy 1 , Ross Crates 1
Affiliation  

Overcoming low breeding success is a major challenge for reversing population decline in threatened species. High nest predation rates are a common cause of low productivity in birds, but implementing evidence-based management actions to reduce nest predation is challenging. Targeted breeding management requires a good understanding of where threatened species breed, the identity and distribution of nest predator species and the impact of these nest predators on breeding success. For rare and nomadic species, this information is hard to come by. The breeding success of regent honeyeater Anthochaera phrygia has declined over recent decades, and nest predation is the primary cause of breeding failure. We conducted point-count surveys of nine avian and three mammalian nest predator species across 80% of the regent honeyeater’s contemporary breeding area in south eastern Australia. We used occupancy models to determine the presence of predator species at survey sites and spatial models to predict predator abundance and species richness across the breeding area. We incorporated predator predictions for regent honeyeater nest locations into nest fate and daily nest survival models. Predator abundance was correlated positively with tree hollow abundance and proximity to water and negatively with shrub cover. Regent honeyeater nest success showed no significant relationship with predator abundance or predator species richness. Given how abundant and widespread avian and mammalian nest predators were throughout the breeding area, improving regent honeyeater nest success is likely to require implementation of simultaneous nest protection measures to avoid potential compensatory nest predation. Further research is required to better understand the relationship between nest predator abundance and regent honeyeater nest success.

中文翻译:

筑巢捕食者的景观尺度分布及其与摄食蜂巢成功的关系

克服低繁殖成功率是扭转受威胁物种种群数量下降的主要挑战。高巢穴捕食率是鸟类生产力低下的常见原因,但实施循证管理行动以减少巢穴捕食是具有挑战性的。有针对性的繁殖管理需要很好地了解受威胁物种的繁殖地点、巢穴捕食者物种的身份和分布以及这些巢穴捕食者对繁殖成功的影响。对于稀有和游牧物种,这些信息很难获得。摄食蜜蚁 Anthochaera phrygia的选育成功近几十年来下降,巢捕食是繁殖失败的主要原因。我们在澳大利亚东南部 80% 的摄政食蜜鸟当代繁殖区对九种鸟类和三种哺乳动物的巢穴捕食者物种进行了点数调查。我们使用占用模型来确定调查地点是否存在捕食者物种,并使用空间模型来预测整个繁殖区的捕食者丰度和物种丰富度。我们将摄政食蜜鸟巢穴位置的捕食者预测纳入巢穴命运和每日巢穴生存模型。捕食者丰度与乔木空心丰度和靠近水体呈正相关,与灌木覆盖呈负相关。摄政食蜜鸟巢的成功与捕食者丰度或捕食者物种丰富度没有显着关系。鉴于整个繁殖区的鸟类和哺乳动物的巢穴捕食者数量众多且分布广泛,提高摄食蜂巢的成功率可能需要同时实施巢穴保护措施,以避免潜在的补偿性巢穴捕食。需要进一步研究以更好地了解巢捕食者丰度与摄政食蜜鸟巢成功之间的关系。
更新日期:2021-06-26
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