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首页> 外文期刊>BMC Ecology >Species traits, patch turnover and successional dynamics: when does intermediate disturbance favour metapopulation occupancy?
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Species traits, patch turnover and successional dynamics: when does intermediate disturbance favour metapopulation occupancy?

机译：物种特征，补丁营业额和连续动态：中间干扰何时有利于按比例占用？

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In fragmented landscapes, natural and anthropogenic disturbances coupled with successional processes result in the destruction and creation of habitat patches. Disturbances are expected to reduce metapopulation occupancy for species associated with stable habitats, but they may benefit species adapted to transitory habitats by maintaining a dynamic mosaic of successional stages. However, while early-successional species may be favoured by very frequent disturbances resetting successional dynamics, metapopulation occupancy may be highest at intermediate disturbance levels for species with mid-successional habitat preferences, though this may be conditional on species traits and patch network characteristics. Here we test this ‘intermediate disturbance hypothesis’ applied to metapopulations (MIDH), using stochastic patch occupancy simulation modelling to assess when does intermediate disturbance favour metapopulation occupancy. We focused on 54 virtual species varying in their habitat preferences, dispersal abilities and local extinction and colonization rates. Long-term metapopulation dynamics was estimated in landscapes with different habitat amounts and patch turnover rates (i.e. disturbance frequency). Equilibrium metapopulation occupancy by late-successional species strongly declined with increasing disturbance frequency, while occupancy by early-successional species increased with disturbance frequency at low disturbance levels and tended to level-off thereafter. Occupancy by mid-successional species tended to increase along with disturbance frequency at low disturbance levels and declining thereafter. Irrespective of habitat preferences, occupancy increased with the amount of habitat, and with species dispersal ability and colonisation efficiency. Our study suggests that MIDH is verified only for species associated with mid-successional habitats. These species may be particularly sensitive to land use changes causing either increases or decreases in disturbance frequency. This may be the case, for instance, of species associated with traditional agricultural and pastoral mosaic landscapes, where many species disappear either through intensification or abandonment processes that change disturbance frequency.
机译：在碎片化的景观中，自然和人为扰动与连续过程相结合，导致栖息地斑块的破坏和创造。预计扰动预计将减少与稳定栖息地相关的物种的比例占用，但它们可以通过维持连续阶段的动态马赛克来利用适应暂时性栖息地的物种。然而，虽然早期的物种可能受到非常频繁的干扰重置连续动态的影响，但是在具有中继栖息地偏好的物种的中间扰动水平中，可以在中间干扰水平上最高，但这可能是物种特征和补丁网络特征的条件。在这里，我们使用随机贴片占用模拟建模来测试该“中间干扰假设”，使用随机贴剂占用模拟建模，以评估中间干扰是否有利于比例占用。我们专注于54个虚拟物种，在其栖息地偏好，分散能力和地方灭绝和殖民化率之间变化。在具有不同栖息地和补丁周转速率的景观中估计了长期的比例动态（即扰动频率）。随着扰动频率的增加，晚连续物种均衡均衡占用率强烈下降，而早期地区的占用随着低扰动水平的扰动频率而增加，此后倾向于水平。中继物种的占用趋于随着低干扰水平的扰动频率和此后下降而增加。无论栖息地偏好如何，占用率随着栖息地的数量增加，物种分散能力和定植效率。我们的研究表明，仅针对与中继栖息地相关的物种进行核实核实。这些物种对土地利用变化特别敏感，导致扰动频率的增加或降低。例如，这可能是与传统农业和田间马赛克景观相关的物种，许多物种通过改变扰动频率的强化或放弃过程消失。

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