确定美国加利福尼亚州三色黑鸟春季觅食栖息地和保护地点的优先顺序

IF 2.6 2区 生物学 Q1 ORNITHOLOGY
Condor Pub Date : 2019-12-11 DOI:10.1093/condor/duz054
Chad B. Wilsey, N. Michel, Katie Krieger, Lotem Taylor, Liling Lee, S. Arthur, N. Clipperton
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引用次数: 3

摘要

摘要三色黑鸟(Agelaius tricolor)是一种范围有限、种群筑巢的濒危物种。蚁群包括成千上万的个体,它们在周围的环境中觅食,有时在筑巢地和觅食地之间往返数英里。本研究探讨了景观组成对蜂群占用的影响,并绘制了美国加利福尼亚州春季觅食栖息地的核心和潜在栖息地。我们利用2008年、2011年和2014年春季三色黑鸟筑巢群的观测结果,描述了在长期干旱期间周围景观的变化。然后,我们构建了发生率和丰度模型,以绘制加州4个生态区的核心觅食栖息地。最后,我们利用模拟的土地覆盖变化来识别恢复情景下的潜在栖息地。在3年的调查中,随着时间的推移,地表水在未被占领的种群位置下降,但在被占领的种群位置保持稳定,这证实了永久地表水是持续存在的三色黑鸟种群的关键特征。几乎所有适合觅食的土地覆盖类型的平均覆盖百分比,以及奶牛场的频率和中位数NDVI,在当前或历史的聚居地都高于其他地方。周围苜蓿、草地和地表水的比例是预测三色黑鸟早期繁殖季节种群数量和种群规模的最佳因素。研究区域的核心觅食栖息地覆盖了600多万英亩,但2014年只有18%被占用。这一结果表明,有必要研究决定种群发生和持续的其他因素,如景观连通性、筑巢基质的分布和来自捕食者的风险。绝大多数(93.1%)的三色黑鸟核心生境发生在私人土地上;因此,拯救这个物种需要私人土地所有者的参与和合作。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Defining spring foraging habitat and prioritization of conservation sites for Tricolored Blackbirds in California, USA
ABSTRACT The Tricolored Blackbird (Agelaius tricolor) is a range-restricted, colonial-nesting species in decline. Colonies include tens of thousands of individuals that forage in the surrounding landscape, at times commuting miles between nesting and foraging grounds. We explored the role of landscape composition on colony occupancy and mapped core and potential spring foraging habitat in California, USA. We used observations of spring Tricolored Blackbird nesting colonies from 2008, 2011, and 2014 and characterized changes in the surrounding landscape during an extended drought. Then, we constructed occurrence and abundance models in order to map core foraging habitat across 4 ecoregions in California. Finally, we used simulated land cover changes to identify potential habitat under restoration scenarios. Across the 3 survey years, surface water declined over time at unoccupied colony locations but remained stable at occupied colony locations, confirming that permanent surface water was a critical feature of persistent Tricolored Blackbird colonies. Average percent cover of nearly all land cover types suitable for foraging, as well as frequency of dairies and median NDVI, were all higher in current or historical colony sites than elsewhere. The proportion of surrounding alfalfa, grasslands, and surface water were the elements of foraging habitat best able to predict Tricolored Blackbird early breeding season colony presence and colony size. Core foraging habitat covered over 6 million acres in the study region, but only 18% was occupied in 2014. This result suggests a need to study additional factors determining colony occurrence and persistence, such as landscape connectivity, distributions of nesting substrates, and risk from predators. The vast majority (93.1%) of Tricolored Blackbird core habitat occurred on private land; therefore, saving the species will require engagement and partnership with private landowners.
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来源期刊
Condor
Condor ORNITHOLOGY-
CiteScore
6.30
自引率
12.50%
发文量
46
审稿时长
6-12 weeks
期刊介绍: The Condor is the official publication of the Cooper Ornithological Society, a non-profit organization of over 2,000 professional and amateur ornithologists and one of the largest ornithological societies in the world. A quarterly international journal that publishes original research from all fields of avian biology, The Condor has been a highly respected forum in ornithology for more than 100 years. The journal is one of the top ranked ornithology publications. Types of paper published include feature articles (longer manuscripts) Short Communications (generally shorter papers or papers that deal with one primary finding), Commentaries (brief papers that comment on articles published previously in The Condor), and Book Reviews.
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