Local Landscape Position Impacts Demographic Rates in a Widespread North American Steppe Bunchgrass

R. Shriver, E. Campbell, Christopher Dailey, Heather E. Gaya, Abby Hill, Sonya Kuzminski, Margaret Miller‐Bartley, Kyle Moen, Riga Moettus, Emma Oschrin, Devin A Reese, Molly Simonson, Alice Willson, T. Parker
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引用次数: 4

Abstract

[this article now published at Ecosphere: https://doi.org/10.1002/ecs2.3351] Understanding the environmental drivers of demographic rates and population dynamics over space and time is critical for anticipating how species will respond to climate change. While the influence of temporal environmental variation and large environmental gradients are well recognized, less is known about how local topography and landscape position influence demography over small spatial scales. Here, we investigate how local landscape position (north- vs. south-facing aspects) influence the demographic rates and population growth of a common bunchgrass in western North America, bluebunch wheatgrass (Pseudoroegneria spicata), using 6 annual censuses measuring growth, survival, and reproductive output. We found notably lower survival on south facing slopes, particularly among smaller individuals. In contrast, south-facing slopes maintained comparatively high reproductive output in most years, measured both as spikes per plant and spikelets per spike. When we combined these data in demographic models, we found that lower survival among small individuals and greater reliance on reproduction mean south-facing slopes would generally have to maintain higher recruitment for a stable population. Our results highlight the important influence that landscape position and local topography can have in driving population trends. As conditions warm and dry with climate change (north-faces becoming similar to current south-facing slope conditions), bluebunch wheatgrass may become more reliant on reproduction to maintain viable populations and more sensitive to variability in recruitment.
当地景观位置影响北美大草原丛草的人口比率
[这篇文章现在发表在Ecosphere: https://doi.org/10.1002/ecs2.3351]了解人口增长率和人口动态在空间和时间上的环境驱动因素对于预测物种如何应对气候变化至关重要。虽然时间环境变化和大环境梯度的影响已经得到了很好的认识,但对于局部地形和景观位置如何在小空间尺度上影响人口统计却知之甚少。在这里,我们调查了当地的景观位置(朝北与朝南)如何影响北美西部常见的束草,蓝束小麦草(Pseudoroegneria spicata)的人口统计率和人口增长,使用6年一次的人口普查来测量生长、存活和繁殖产出。我们发现,在朝南的斜坡上,尤其是体型较小的个体,存活率明显较低。相反,南坡在大多数年份保持较高的繁殖产量,以每株穗数和每穗粒数来衡量。当我们在人口统计学模型中结合这些数据时,我们发现小个体的存活率较低,对繁殖的依赖程度较高,这意味着朝南的斜坡通常需要保持较高的招募率来维持稳定的种群。我们的研究结果强调了景观位置和当地地形对人口趋势的重要影响。随着气候变化带来的温暖和干燥(朝北的条件变得与目前朝南的斜坡条件相似),蓝穗小麦草可能会更加依赖繁殖来维持可存活的种群,并且对招募的变化更加敏感。
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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