Hardy Michael A, Broadway Matthew S, Pollentier Christopher D, Radeloff Volker C, Riddle Jason D, Hull Scott D, Zuckerberg Benjamin
Department of Forest and Wildlife Ecology University of Wisconsin-Madison Madison WI USA.
Present address: Biogeographic Data Branch California Department of Fish & Wildlife Sacramento CA USA.
Ecol Evol. 2020 Oct 29;10(23):12777-12791. doi: 10.1002/ece3.6805. eCollection 2020 Dec.
Grassland birds have exhibited dramatic and widespread declines since the mid-20th century. Greater prairie chickens () are considered an umbrella species for grassland conservation and are frequent targets of management, but their responses to land use and management can be quite variable. We used data collected during 2007-2009 and 2014-2015 to investigate effects of land use and grassland management practices on habitat selection and survival rates of greater prairie chickens in central Wisconsin, USA. We examined habitat, nest-site, and brood-rearing site selection by hens and modeled effects of land cover and management on survival rates of hens, nests, and broods. Prairie chickens consistently selected grassland over other cover types, but selection or avoidance of management practices varied among life-history stages. Hen, nest, and brood survival rates were influenced by different land cover types and management practices. At the landscape scale, hens selected areas where brush and trees had been removed during the previous year, which increased hen survival. Hens selected nest sites in hay fields and brood-rearing sites in burned areas, but prescribed fire had a negative influence on hen survival. Brood survival rates were positively associated with grazing and were highest when home ranges contained ≈15%-20% shrub/tree cover. The effects of landscape composition on nest survival were ambiguous. Collectively, our results highlight the importance of evaluating responses to management efforts across a range of life-history stages and suggest that a variety of management practices are likely necessary to provide structurally heterogeneous, high-quality habitat for greater prairie chickens. Brush and tree removal, grazing, hay cultivation, and prescribed fire may be especially beneficial for prairie chickens in central Wisconsin, but trade-offs among life-history stages and the timing of management practices must be considered carefully.
自20世纪中叶以来,草原鸟类数量急剧下降且分布广泛。草原榛鸡被视为草原保护的伞护种,也是管理工作的常见目标,但它们对土地利用和管理的反应可能差异很大。我们利用2007 - 2009年以及2014 - 2015年收集的数据,调查了美国威斯康星州中部土地利用和草原管理措施对草原榛鸡栖息地选择和存活率的影响。我们研究了雌鸡对栖息地、巢穴和育雏地点的选择,并模拟了土地覆盖和管理对雌鸡、巢穴和雏鸡存活率的影响。草原榛鸡始终选择草原而非其他覆盖类型,但对管理措施的选择或回避在不同生活史阶段有所不同。雌鸡、巢穴和雏鸡的存活率受到不同土地覆盖类型和管理措施的影响。在景观尺度上,雌鸡选择前一年已清除灌木和树木的区域,这提高了雌鸡的存活率。雌鸡在干草地选择筑巢地点,在火烧区域选择育雏地点,但规定火烧对雌鸡存活率有负面影响。雏鸡存活率与放牧呈正相关,当家域内灌木/树木覆盖率约为15% - 20%时,雏鸡存活率最高。景观组成对巢穴存活率的影响尚不明确。总体而言,我们的结果凸显了评估不同生活史阶段对管理措施反应的重要性,并表明可能需要多种管理措施来为草原榛鸡提供结构多样、高质量的栖息地。清除灌木和树木、放牧、种植干草以及规定火烧对威斯康星州中部的草原榛鸡可能特别有益,但必须仔细考虑生活史阶段之间的权衡以及管理措施的时机。