School of Life and Environmental Sciences, University of Sydney, Sydney, 2006, Australia.
Centre de Recerca Ecologica i Aplicacions Forestals - CREAF, Universitat Autonoma de Barcelona, Cerdanyola del Vallès, Catalunya, 08193, Spain.
Sci Rep. 2020 Mar 31;10(1):5723. doi: 10.1038/s41598-020-62402-3.
Although adult cane toads (Rhinella marina) are generally active only at night, a recent study reported that individuals of this species switched to diurnal activity in response to encountering a novel habitat type (deeply shaded gorges) in the course of their Australian invasion. Our sampling over a broader geographic scale challenges the idea that this behaviour is novel; we documented diurnal behaviour both in the species' native range and in several sites within the invaded range, in multiple habitat types. Diurnal activity was most common in the tropics and in areas where toads attain high population densities and are in poor body condition, suggesting that the expansion of activity times may be induced by intraspecific competition for food.
虽然成年甘蔗蟾蜍（Rhinella marina）通常只在夜间活动，但最近的一项研究报告称，在澳大利亚入侵过程中，该物种遇到了一种新的栖息地类型（深阴影峡谷），从而转向了昼间活动。我们在更广泛的地理范围内进行的采样挑战了这种行为是新颖的观点；我们在该物种的原生范围和入侵范围的多个地点、多种栖息地类型中记录到了昼间行为。在热带地区和蟾蜍种群密度高且身体状况不佳的地区，昼间活动最为常见，这表明活动时间的扩大可能是由于同种内对食物的竞争而引起的。
