Comparison of Indices to infer Population Dynamics of Black Brant

IF 0.9 4区 环境科学与生态学 Q4 BIODIVERSITY CONSERVATION Journal of Fish and Wildlife Management Pub Date : 2022-05-20 DOI:10.3996/jfwm-21-088
P. Flint
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Abstract

To aid managers in assessing status of Pacific black brant Branta bernicla nigricans, I examined preexisting long-term data series from summer, fall staging and wintering areas to infer overall population processes and assessed the utility of the various data sources.  Variation in demographic parameters measured in sub-Arctic and Arctic locations suggests some form of meta-population structure likely exists for Pacific brant.  I used serial autocorrelation coefficients assess the ability of various indices to track population processes.  Based on this approach, the Lincoln-Petersen estimator and the fall aerial survey estimate partitioned using age ratios of staging brant at Izembek Lagoon, Alaska appear to be the best indicators.  However, these two indexes show different trends for the overall Pacific black brant population.  The Lincoln-Petersen estimates showed biologically implausible changes in size among sequential years, whereas the fall Izembek index did not.  Annual estimates of survival and productivity fit the patterns of annual variation in the fall Izembek index better than the Lincoln-Petersen estimates.  I conclude that the fall age partitioned Izembek Lagoon index appears to be the best for tracking population process in Pacific black brant.
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黑Brant种群动态推断指标的比较
为了帮助管理者评估太平洋黑枝黑枝(Branta bernicla nigricans)的状况,我检查了夏季、秋季和冬季地区已有的长期数据系列,以推断总体种群过程,并评估了各种数据源的效用。在亚北极和北极地区测量的人口统计参数的变化表明太平洋勃朗可能存在某种形式的元种群结构。我使用序列自相关系数来评估各种指数跟踪种群过程的能力。基于这种方法,Lincoln-Petersen估计值和使用阿拉斯加izembeck泻湖分期brant的年龄比划分的秋季航空测量估计值似乎是最好的指标。然而,这两个指数显示了整个太平洋黑鲸种群的不同趋势。林肯-彼得森的估计显示,从生物学角度来看,连续几年的规模变化是难以置信的,而秋天的伊兹贝克指数却没有。生存和生产力的年度估计比林肯-彼得森的估计更符合秋季izembeck指数的年度变化模式。我得出结论,秋天年龄划分的伊兹贝克湖指数似乎是最好的跟踪太平洋黑枝种群过程。
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来源期刊
Journal of Fish and Wildlife Management
Journal of Fish and Wildlife Management BIODIVERSITY CONSERVATION-ECOLOGY
CiteScore
1.60
自引率
0.00%
发文量
43
审稿时长
>12 weeks
期刊介绍: Journal of Fish and Wildlife Management encourages submission of original, high quality, English-language scientific papers on the practical application and integration of science to conservation and management of native North American fish, wildlife, plants and their habitats in the following categories: Articles, Notes, Surveys and Issues and Perspectives. Papers that do not relate directly to native North American fish, wildlife plants or their habitats may be considered if they highlight species that are closely related to, or conservation issues that are germane to, those in North America.
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