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Undetected Allee effects in Australia's threatened birds: implications for conservation

机译：在澳大利亚受到威胁的鸟类的未被发现的杂色效应：保护的含义

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摘要

Allee effects occur when survival or reproductive success declines with decreasing population size or density. Species most severely impacted by Allee effects may be the very species for which these effects will be hardest to detect and overcome. This impedes effective conservation through a lack of evidence to drive management actions. We review the literature to identify (1) component Allee effects (components of fitness) which could lead to a demographic Allee effect (effect of all components on the population growth rate) in bird populations; and (2) traits that make species susceptible to component Allee effects. Concurrently, we assess the potential for undetected Allee effects to negatively influence the population growth rate of 14 critically endangered Australian bird species or subspecies. Whilst some (e.g. Helmeted Honeyeater) are unlikely to suffer from a demographic Allee effect, several (e.g. Great Knot, Orange-bellied Parrot) are susceptible to a number of component Allee effects and, hence, a demographic Allee effect. However, traits of the Regent Honeyeater suggests this species' decline in particular is accelerated by an undetected demographic Allee effect. For this species and others, an inability to detect Allee effects need not preclude efforts to account for their potential presence through precautionary conservation management.
机译：当生存或生殖成功下降随着人口大小或密度降低时，acte效应发生。由Allee Effects最严重影响的物种可能是这些效果最难检测和克服的物种。这将通过缺乏证据来推动管理行动的有效保护。我们审查了识别（1）组分展示效果的文献（1）组分效果（健身组件），这可能导致鸟类种群中的人口统计学效应（所有组分对人口增长率的影响）; （2）使物种容易受到组分含量效应的特征。同时，我们评估未检测到的Allee效应的潜力，对14个危险的澳大利亚鸟类或亚种类的人口增长率产生负面影响。虽然一些（例如头盔蜜蜂）不太可能遭受人口统计学效果，但是，几种（例如，很棒的结，橙色腹膜鹦鹉）易受许多组分的含量效应的影响，因此，人口统计学效果。然而，摄政蜜蜂的特质表明，这种物种的下降特别是未检测到的人口统计学效应加速。对于这种物种和其他物种，无法检测到Allee Effects的不必妨碍努力，以考虑他们通过预防性保护管理的潜在存在。

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