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Environmental conditions modulate compensatory effects of site dependence in a food‐caching passerine
Ecology ( IF 4.8 ) Pub Date : 2020-11-09 , DOI: 10.1002/ecy.3203
Alex O. Sutton 1 , Dan Strickland 2 , Nikole E. Freeman 1 , D. Ryan Norris 1, 3
Affiliation  

Although density regulates the abundance of most wild animal populations by influencing vital rates, such as fecundity and survival, the mechanisms responsible for generating negative density-dependence are unclear for many species. Site-dependence occurs when there is preferential filling of high-quality territories, which results in higher per capita vital rates at low densities because a larger proportion of occupied territories are of high quality. Using 41 years of territory occupancy and demographic data, we investigated whether site-dependence was a mechanism acting to influence fecundity and, by extension, regulate a population of Canada jays in Algonquin Provincial Park, ON. As predicted by site-dependence, the proportion of occupied territories that were of high quality was negatively correlated with population density and periods of vacancy were shorter for high-quality territories than for low-quality territories. We also found evidence that per capita fecundity was positively related to the proportion of occupied territories that were of high quality, but only when environmental conditions, which influence the entire population, were otherwise poor for breeding. Our results suggest that site-dependence likely plays a role in regulating this population but that environmental conditions can modulate the strength of density-dependence.

中文翻译:

环境条件调节食物缓存雀形体中位点依赖性的补偿效应

尽管密度通过影响繁殖率和存活率等重要速率来调节大多数野生动物种群的丰度,但对许多物种而言,导致负密度依赖性的机制尚不清楚。当优先填充高质量领土时会出现场地依赖性,这会导致低密度下的人均生命率较高,因为被占领土的大部分是高质量的。使用 41 年的领土占有率和人口统计数据,我们调查了场地依赖性是否是一种影响繁殖力的机制,并进而调节安大略省阿冈昆省立公园的加拿大松鸦种群。正如站点依赖性所预测的那样,高质量被占领土的比例与人口密度呈负相关,高质量领土的空置期比低质量领土短。我们还发现证据表明,人均繁殖力与高质量被占领土的比例呈正相关,但仅当影响整个人口的环境条件不利于繁殖时才如此。我们的结果表明,位点依赖性可能在调节这一种群中发挥作用,但环境条件可以调节密度依赖性的强度。我们还发现证据表明,人均繁殖力与高质量被占领土的比例呈正相关,但仅当影响整个人口的环境条件不利于繁殖时才如此。我们的结果表明,位点依赖性可能在调节这一种群方面发挥作用,但环境条件可以调节密度依赖性的强度。我们还发现证据表明,人均繁殖力与高质量被占领土的比例呈正相关,但仅当影响整个人口的环境条件不利于繁殖时才如此。我们的结果表明,位点依赖性可能在调节这一种群方面发挥作用,但环境条件可以调节密度依赖性的强度。
更新日期:2020-11-09
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