Range-Wide Patterns of Natal and Breeding Dispersal in the Streaked Horned Lark

IF 0.5 4区环境科学与生态学 Q4 ECOLOGY

Northwest Science Pub Date : 2020-04-22 DOI:10.3955/046.094.0103

A. Wolf, G. Slater, S. Pearson, Hannah E. Anderson, Randall P. Moore

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引用次数: 1

Abstract

Abstract The streaked horned lark (Eremophila alpestris strigata) is a federally-threatened ground-nesting passerine. We investigated range-wide patterns of dispersal by analyzing resight records between 2002 and 2016 from four regions (South Puget Lowlands, Lower Columbia River, Washington Coast, Willamette Valley) and determined frequency and distances of dispersal events for second-year (SY, natal dispersal) and after second-year adults (ASY, breeding dispersal). Of 148 SY adults originally banded as dependent young and subsequently resighted as breeders, 111 (75%) returned to their natal breeding site and 37 (25%) dispersed to new sites. Among the latter, only two individuals dispersed to a different region. For natal dispersers that left their natal site, mean dispersal distance was 20.5 ± 26.8 km (± SD, median = 11.7 km) although most (73%) travelled less than 15 km. Female natal dispersers moved to new sites more frequently than males (29% versus 20%), which is consistent with typical female-biased dispersal in birds. In contrast to SY birds, ASY birds largely remained at the site where they spent their first potential breeding season (68 of 71; 96%). No adults left the region in which they first bred. These patterns of natal dispersal, emigration, and immigration can inform conservation planning by contributing to priorities for land protection.

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斑角云雀的出生和繁殖扩散模式

摘要条纹角百灵鸟（Eremophila alpestris strigata）是一种受到联邦政府威胁的地面筑巢雀形目。我们通过分析2002年至2016年期间四个地区（南普吉特低地、哥伦比亚河下游、华盛顿海岸、威拉米特山谷）的迁徙记录，调查了广泛的传播模式，并确定了第二年（SY，出生传播）和第二年成年后（ASY，繁殖传播）传播事件的频率和距离。148只SY成年犬最初被标记为依赖幼犬，随后被重新命名为繁殖者，其中111只（75%）返回了出生繁殖地，37只（25%）分散到了新的繁殖地。在后者中，只有两个人分散到不同的地区。对于离开出生地的出生分散者，平均分散距离为20.5±26.8公里（±SD，中位数=11.7公里），尽管大多数（73%）的传播距离不到15公里。雌性出生分散者比雄性更频繁地迁移到新的地点（29%对20%），这与鸟类中典型的雌性偏散一致。与SY鸟类相比，ASY鸟类大部分留在它们度过第一个潜在繁殖季节的地方（71只中的68只；96%）。没有成年人离开他们最初繁殖的地区。这些出生地分散、移民和移民的模式可以通过促进土地保护的优先事项来为保护规划提供信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Northwest Science 环境科学-生态学

CiteScore

1.30

自引率

0.00%

发文量

审稿时长

>36 weeks

期刊介绍： The pages of Northwest Science are open to original and fundamental research in the basic, applied, and social sciences. All submissions are refereed by at least two qualified peer reviewers. Papers are welcome from authors outside of the Pacific Northwest if the topic is suitable to our regional audience.