In many regions of the world pollinator populations are rapidly declining, a trend that is expected to disrupt major ecosystem functions and services. These changes in pollinator abundance may be prone to critical transitions with abrupt shifts to a state strongly depleted both in pollinator and vegetation abundance. Here we develop a process-based model to investigate the effect of a positive pollinator-vegetation feedback, whereby an initial decline in plant density increases selfing thereby reducing floral resources and negatively affecting pollinators. We show that a decline in resource availability and an increase in disturbance intensity can induce an abrupt shift in vegetation and pollinator dynamics and potentially lead to the collapse of plant-pollinator systems. Thus, endogenous feedbacks can induce strong non-linearities in plant-pollinator dynamics, making them vulnerable to critical transitions to a state depleted of both plants and pollinators in response to resource deficiency and natural or anthropogenic disturbance.

在世界许多地区，传粉媒介种群正在迅速减少，这一趋势有望破坏主要的生态系统功能和服务。授粉媒介丰度的这些变化可能易于发生临界转变，突然转变为授粉媒介和植被丰度都严重消耗的状态。在这里，我们开发了一个基于过程的模型来调查正传粉者-植被反馈的影响，从而植物密度的初始下降会增加自交，从而减少花粉资源并对传粉者产生负面影响。我们表明，资源可用性的下降和干扰强度的增加会导致植被和授粉媒介动力学的突然转变，并可能导致植物授粉系统的崩溃。从而，