莫哈韦沙漠象龟(Gopherus agassizii)占用动态的短期植被驱动力

IF 2.9 3区 环境科学与生态学 Q2 ECOLOGY
Ecosphere Pub Date : 2025-08-12 DOI:10.1002/ecs2.70381
Seth M. Harju, Scott M. Cambrin, Stefanie Ferrazzano
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引用次数: 0

摘要

了解与物种在整个景观中出现的可能性相关的因素已成为野生动物管理和监测的基础组成部分。静态因素(例如,地形或永久木本植被等随时间变化的地块特征)经常被调查,但不断变化的植被因素也可能驱动明显的占用动态,因为能量最小化物种对食物资源的短暂变化做出了反应。本文分析了牧草和牧草对莫哈韦沙漠象龟(Gopherus agassizii)占用动态的影响,认为当食物植物(牧草)丰富时,占用率较高;当非食物植物(牧草)广泛时,占用率较低。研究发现,静态样地水平因子均不能解释第一年的初始占用,但植被因子确实影响年际占用动态。在某一年无人居住的地块,每增加1%的草地覆盖面积,次年被占用的可能性就会降低14.4%(即草地覆盖面积对地块年占用率的负面影响)。相反,植被覆盖度每增加1%,被占用地块次年未被占用的可能性降低72.5%,并且我们意外地发现,每增加一个草种,被占用地块未被占用的可能性降低76.9%。然而,可信区间较宽,表明短暂植被驱动莫哈韦沙漠象龟占用动态的模式强烈但不一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Ephemeral vegetation drivers of occupancy dynamics of Mojave desert tortoises (Gopherus agassizii)

Ephemeral vegetation drivers of occupancy dynamics of Mojave desert tortoises (Gopherus agassizii)

Ephemeral vegetation drivers of occupancy dynamics of Mojave desert tortoises (Gopherus agassizii)

Ephemeral vegetation drivers of occupancy dynamics of Mojave desert tortoises (Gopherus agassizii)

Ephemeral vegetation drivers of occupancy dynamics of Mojave desert tortoises (Gopherus agassizii)

Ephemeral vegetation drivers of occupancy dynamics of Mojave desert tortoises (Gopherus agassizii)

Understanding the factors associated with the probability of a species occurring across the landscape has become a foundational component of wildlife management and monitoring. Static factors (e.g., plot characteristics that are consistent across time, such as topography or permanent woody vegetation) are often investigated, but changing vegetation factors may also drive apparent occupancy dynamics as energy-minimizing species respond to ephemeral changes in food resources. We analyzed the role of ephemeral forbs and grasses in the occupancy dynamics of Mojave desert tortoises (Gopherus agassizii), expecting higher occupancy when food plants (forbs) were abundant and lower occupancy when non-food plants (grasses) were widespread. We found that none of the static plot-level factors explained initial occupancy in the first year, but vegetation factors did influence interannual occupancy dynamics. Plots that were unoccupied in a given year were 14.4% less likely to become occupied in the following year for every 1% point increase in grass cover within the plot (i.e., a negative effect of grass cover on annual plot occupancy). Conversely, occupied plots were 72.5% less likely to become unoccupied in the subsequent year for every 1% point increase in the cover of forbs, and we unexpectedly found that occupied plots were 76.9% less likely to become unoccupied for every additional grass species present in the plot. However, credible intervals were wide, indicating strong but inconsistent patterns of ephemeral vegetation driving occupancy dynamics of Mojave desert tortoises.

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来源期刊
Ecosphere
Ecosphere ECOLOGY-
CiteScore
4.70
自引率
3.70%
发文量
378
审稿时长
15 weeks
期刊介绍: The scope of Ecosphere is as broad as the science of ecology itself. The journal welcomes submissions from all sub-disciplines of ecological science, as well as interdisciplinary studies relating to ecology. The journal''s goal is to provide a rapid-publication, online-only, open-access alternative to ESA''s other journals, while maintaining the rigorous standards of peer review for which ESA publications are renowned.
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