Changing motivations during migration: linking movement speed to reproductive status in a migratory large mammal
Changing motivations during migration: linking movement speed to reproductive status in a migratory large mammal
复制标题
迁徙过程中动机的变化：将大型迁徙哺乳动物的移动速度与繁殖状态联系起来
作者：
Navinder J. Singh;G. Ericsson
动物生态学的一个挑战是将动物运动与人口统计联系起来。一般来说，繁殖和非繁殖动物可能会表现出不同的运动模式。生殖状况的急剧变化，例如在迁徙过程中失去后代，也可能影响迁徙。将运动速度与生殖状态联系起来的研究需要对生活史事件进行个体监测，因此很少。在这里，我们链接运动数据从98个GPS项圈的雌性驼鹿（Alces alces）的生殖状态和小牛存活的实地观察。我们发现，生殖女性在迁移过程中比非生殖女性移动更快。此外，在迁徙过程中失去一只小牛引发了雌性速度的下降。这与不再受伴随后代约束的雌性可能出现的情况相反。所观察到的模式表明，不同的生殖状态的女性可能有不同的运动模式，并在迁移过程中的生殖状态的变化，可能会改变潜在的动机移动。
A challenge in animal ecology is to link animal movement to demography. In general, reproducing and non-reproducing animals may show different movement patterns. Dramatic changes in reproductive status, such as the loss of an offspring during the course of migration, might also affect movement. Studies linking movement speed to reproductive status require individual monitoring of life-history events and hence are rare. Here, we link movement data from 98 GPS-collared female moose (Alces alces) to field observations of reproductive status and calf survival. We show that reproductive females move more quickly during migration than non-reproductive females. Further, the loss of a calf over the course of migration triggered a decrease in speed of the female. This is in contrast to what might be expected for females no longer constrained by an accompanying offspring. The observed patterns demonstrate that females of different reproductive status may have distinct movement patterns, and that the underlying motivation to move may be altered by a change in reproductive status during migration.