Differences in growth rates and pre-hibernation body mass gain between early and late-born juvenile garden dormice.
Differences in growth rates and pre-hibernation body mass gain between early and late-born juvenile garden dormice.
复制标题
早期和后期幼年宿舍之间生长速率和预见前体重增益的差异。
DOI：
10.1007/s00360-016-1017-x
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发表时间：
2017-01
期刊：
影响因子：
--
通讯作者：
Giroud S
中科院分区：
文献类型：
--
作者：
Stumpfel S;Bieber C;Blanc S;Ruf T;Giroud S
幼年冬眠动物必须将能量分配给生长和增肥，以度过冬天，并避免在第一个繁殖季节可能出现的不利情况。在繁殖季节出生较晚可能对生长和育肥有重要影响。本研究的目的是确定潜在的差异率和最大水平的增长，并在冬眠前的身体脂肪量之间的早期和晚期出生的少年花园睡鼠（Eliomys quercinus），并保持在户外围栏与随意的食物和水。我们首先评估了从出生到早期断奶阶段的早期和晚期出生窝仔（n = 31）的平均幼仔质量，此时确定了身体成分。然后，生长和体重的早期和晚期出生的个人（6名男性和6名女性，每组）每周测量，直到冬眠开始（n = 24）。我们还评估了一组青少年在冬眠前育肥（n = 16）和第一次冬眠后（n = 18）的脂肪含量。在断奶前阶段，年轻的早期和后期窝主要增长结构和获得质量以相似的速度。断奶后，晚出生的青少年成长和获得质量的两倍，早出生的个人。在冬眠前的育肥过程中，体重与脂肪含量呈正相关。晚出生的女性达到类似的结构尺寸，但有较低的冬眠前脂肪储备比早出生的女性。相反，晚出生的男性表现出较低的最大尺寸和冬眠前的身体脂肪含量，与早期出生的男性。因此，在季节后期出生的个体不能完全弥补冬季来临前可用时间的不足。
Juvenile hibernators have to allocate energy to both growth and fattening, to survive winter, and to avoid possible disadvantages during their first reproductive season. Being born late in the active season may have important effects on growth and fattening. This study aimed at determining potential differences in rates and maximal level of growth, and in pre-hibernation body fat mass between early and late-born juvenile garden dormice (Eliomys quercinus), and kept in outdoor enclosures with ad libitum food and water. We first assessed mean pup mass in early and late-born litters (n = 31) from birth to their early weaning phase, at which time body composition was determined. Then, growth and body mass of early and late-born individuals (six males and six females, for each group) were measured weekly until hibernation onset (n = 24). We also assessed fat content in a group of juveniles during pre-hibernation fattening (n = 16) and after their first winter hibernation (n = 18). During the pre-weaning phase, young from early and late litters mainly grew structurally and gained mass at similar rates. After weaning, late-born juveniles grew and gained mass twice as fast as early born individuals. Body mass was positively associated with fat content during pre-hibernation fattening. Late-born females reached similar structural sizes, but had lower pre-hibernation fat reserves than early born females. Conversely, late-born males showed lower maximal size and pre-hibernation body fat content, compared with early born males. Thus, individuals born late in the season cannot fully compensate the lack of available time before the winter onset.