Differences in aggressive behaviour along the expanding range of an invasive crayfish: an important component of invasion dynamics
Differences in aggressive behaviour along the expanding range of an invasive crayfish: an important component of invasion dynamics
复制标题
入侵小龙虾范围扩大时攻击行为的差异：入侵动态的重要组成部分
作者：
Sandra Hudina;K. Žganec;K. Hock
摘要攻击性相互作用对许多动物的资源分配和种群动态都是必不可少的。侵略性也可以帮助入侵物种从其他物种那里争夺资源，并入侵新的栖息地。为了研究物种内侵略范围扩大的影响，我们比较了侵略水平的信号小龙虾（小龙虾）的核心和前面的入侵范围在最近入侵的克罗地亚地区。更明显的侵略，观察到在人口密度高的核心种群，表明潜在的更大的重要性，在人口中具有较高的竞争压力的高度侵略性的行为。尽管整体身体状况较好，但入侵前线的个体通常表现出较低的侵略性，并经常失去与入侵核心个体的互动。而不是在范围扩张期间提供竞争优势，侵略可能更多地表现在已建立的种群中，为未来的扩张做好准备，同时也推动向外扩散。沿着入侵途径的侵略观察到的差异表明，有助于个人克服其环境的挑战，如对同种竞争的特征，可以驱动入侵动态的一个成功的入侵者在一个新的环境中的生态位竞争和内在的扩张动态。
AbstractAggressive interactions are essential for resource distribution and population dynamics of many animal species. Aggression can also help invasive species to wrestle the resources from other species and invade new habitat. To examine the effects of intra-species aggression on range expansion, we compared aggression levels of signal crayfish (Pacifastacus leniusculus) at the core and front of the invasion range in recently invaded regions of Croatia. More pronounced aggression was observed in core populations with high population densities, indicating potentially greater importance of highly aggressive behaviour in populations with higher competitive pressure. Despite better overall physical condition, individuals at the invasion front generally displayed lower levels of aggression and regularly lost interactions to individuals from the invasion core. Rather than providing a competitive advantage during range expansion, aggression may be more expressed in established populations, priming the individuals for future expansions while also driving the dispersal outward. The observed difference in aggression along the invasion pathway demonstrates that traits that help individuals to overcome challenges of their environment, such as competition against conspecifics, can drive the invasion dynamics of a successful invader in a new environment in terms of both niche competition and intrinsic expansion dynamics.
影响因子：
8.8
作者：
Burton, Olivia J.;Phillips, Ben L.;Travis, Justin M. J.
通讯作者：
Travis, Justin M. J.