Synergistic impacts of aggressive species on small birds in a fragmented landscape,Journal of Applied Ecology

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Synergistic impacts of aggressive species on small birds in a fragmented landscape
Journal of Applied Ecology ( IF 5.0 ) Pub Date : 2021-01-18 , DOI: 10.1111/1365-2664.13838
Martin J. Westgate _{1,

2,

3} , Mason Crane _{1,

2,

3} , Daniel Florance _{1,

2,

3} , David B. Lindenmayer _{1,

2,

3}

Affiliation

Attempts to conserve threatened species in fragmented landscapes are often challenging because factors such as habitat loss, habitat degradation and dominant species interact to reduce threatened species’ capacity to survive and reproduce. Understanding how threatening and mitigating processes interact is critical if conservation measures are to be effective.
We used data from long‐term monitoring of bird populations and multivariate latent variable models to quantify how Australian woodland birds respond to the presence of the Noisy Miner, a despotic species known to exclude other bird species. We then investigated the extent to which the presence of other aggressive species exacerbates the impacts of the Noisy Miner, and to what extent these impacts can be mitigated by dense midstorey plantings.
We found strong synergies between the Noisy Miner and two other aggressive species (Grey Butcherbird and Pied Butcherbird), despite weak effects of butcherbirds in isolation.
The impacts of aggressive birds are most pronounced for small‐bodied species, but these impacts are lessened in the presence of high midstorey cover.
Synthesis and applications. Accounting for interactions reveals that revegetation may be capable of improving conservation outcomes even when the proximate cause of species declines (i.e. exclusion or predation by aggressive bird species) cannot be managed directly.

中文翻译：

零散景观中侵略性物种对小鸟的协同影响

试图在零散的景观中保护濒危物种常常具有挑战性，因为诸如栖息地丧失，栖息地退化和优势物种之类的因素相互作用，降低了濒危物种的生存和繁殖能力。如果要采取有效的保护措施，了解威胁和缓解过程的相互作用是至关重要的。
我们使用了对鸟类种群进行长期监测的数据和多元潜在变量模型来量化澳大利亚林地鸟类对Noisy Miner的反应，Noisy Miner是一种众所周知的排除其他鸟类物种的稀有物种。然后，我们调查了其他侵略性物种的存在在多大程度上加剧了Noisy Miner的影响，以及密集的中层种植可在多大程度上减轻这些影响。
尽管在孤立的情况下，cher鸟的影响较弱，但我们发现Noisy Miner与其他两个侵略性物种（灰色But鸟和Pied Butcherbird）之间具有很强的协同作用。
攻击性鸟类对小型鸟类的影响最为明显，但在中层较高的覆盖率下，这些影响会减小。
综合与应用。对相互作用的解释表明，即使不能直接管理物种下降的直接原因（即，侵略性鸟类排斥或捕食），也可以改善植被的保护成果。

更新日期：2021-01-18

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