在巴西南部沿海草原越冬的濒危黄胸矶鹬的趋势和数量估计

IF 1.5 4区 环境科学与生态学 Q3 BIODIVERSITY CONSERVATION
F. A. Faria, R. Dias, G. A. Bencke, L. Bugoni, Nathan R. Senner, Juliana B. Almeida, G. Nunes, M. S. S. Gonçalves, J. Lyons
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引用次数: 0

摘要

关于种群规模、趋势和栖息地利用的信息是物种保护和管理的关键。牛胸矶鹬(BBSA)是一种长途迁徙的滨鸟,在北极繁殖,然后迁徙到南美洲东南部,在巴西南部、乌拉圭和阿根廷的草原上过冬。大多数关于新北极迁徙物种的研究都发生在北半球,但在非繁殖区监测这些物种对于在每年周期的这一阶段进行保护至关重要。我们的第一个目标是估计巴西南部四个关键地区在非繁殖季节的BBSA趋势。在2008/09至2019/20的大部分年份,我们对BBSA进行了调查,并测量了植被高度。我们使用分层距离采样模型,其中BBSA丰度和密度作为植被高度的函数建模,并根据可探测性进行校正。接下来,我们使用实地调查结合卫星图像和栖息地分类模型来估计2019/20年两个主要非繁殖区的BBSA种群规模。植被高度的增加对植物的丰度和密度有显著的负向影响。在研究期间,丰度波动了5到8倍,在研究中期达到峰值(2014/15)。我们估计,2019/20年南方夏季,Torotama岛的BBSA越冬种群规模为1,201只(95%可信区间[CI]: 637-1,946), Lagoa do Peixe国家公园的BBSA越冬种群规模为2,232只(95% CI: 1,199-3,584)。虽然没有发现明显的趋势,但BBSA丰度每年波动很大。结果表明,在4个关键区域中,只有2个区域的BBSA密度较高,并突出了矮草对BBSA数量的积极影响。海岸带短草生境受家畜放牧和气候的强烈影响,预计随着未来发展和气候变化,短草生境规模将缩小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Trends and population estimate of the threatened Buff-breasted Sandpiper Calidris subruficollis wintering in coastal grasslands of southern Brazil
Summary Information about population sizes, trends, and habitat use is key for species conservation and management. The Buff-breasted Sandpiper Calidris subruficollis (BBSA) is a long-distance migratory shorebird that breeds in the Arctic and migrates to south-eastern South America, wintering in the grasslands of southern Brazil, Uruguay, and Argentina. Most studies of Nearctic migratory species occur in the Northern Hemisphere, but monitoring these species at non-breeding areas is crucial for conservation during this phase of the annual cycle. Our first objective was to estimate trends of BBSA at four key areas in southern Brazil during the non-breeding season. We surveyed for BBSA and measured vegetation height in most years from 2008/09 to 2019/20. We used hierarchical distance sampling models in which BBSA abundance and density were modelled as a function of vegetation height and corrected for detectability. Next, we used on-the-ground surveys combined with satellite imagery and habitat classification models to estimate BBSA population size in 2019/20 at two major non-breeding areas. We found that abundance and density were negatively affected by increasing vegetation height. Abundance fluctuated five- to eight-fold over the study period, with peaks in the middle of the study (2014/15). We estimated the BBSA wintering population size as 1,201 (95% credible interval [CI]: 637–1,946) birds in Torotama Island and 2,232 (95% CI: 1,199–3,584) in Lagoa do Peixe National Park during the 2019/20 austral summer. Although no pronounced trend was detected, BBSA abundance fluctuated greatly from year to year. Our results demonstrate that only two of the four key areas hold high densities of BBSA and highlight the positive effect of short grass on BBSA numbers. Short-grass coastal habitats used by BBSA are strongly influenced by livestock grazing and climate, and are expected to shrink in size with future development and climatic changes.
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来源期刊
CiteScore
3.40
自引率
6.20%
发文量
50
审稿时长
>12 weeks
期刊介绍: Bird Conservation International is a quarterly peer-reviewed journal that seeks to promote worldwide research and action for the conservation of birds and the habitats upon which they depend. The official journal of BirdLife International, it provides stimulating, international and up-to-date coverage of a broad range of conservation topics, using birds to illuminate wider issues of biodiversity, conservation and sustainable resource use. It publishes original papers and reviews, including targeted articles and recommendations by leading experts.
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