Differential growth patterns in two seasonal cohorts of the large Japanese field mouse Apodemus speciosus
Differential growth patterns in two seasonal cohorts of the large Japanese field mouse Apodemus speciosus
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DOI：
10.1644/09-mamm-a-305.1
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发表时间：
2010-10
期刊：
影响因子：
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通讯作者：
Yuta Shintaku;Mariko Kageyama;M. Motokawa
中科院分区：
文献类型：
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作者：
Yuta Shintaku;Mariko Kageyama;M. Motokawa
摘要我们研究了春季和秋季队列的大型日本田鼠（Apodemus speciosus）的外部和头骨形态的生长差异。我们分析了来自京都种群的271个样本，它们有2个离散的繁殖期，春季和秋季。发现2个队列之间的体重、头长和体长存在生长差异。春季队列在出生后的夏季快速生长，而秋季队列在出生后不久的秋季和冬季表现出生长抑制，并在接下来的春季和夏季快速生长。颅骨和下颌骨的质心大小（CS）表现出相似的生长模式，但没有显着断奶后的增长观察到的耳长和后足长。颅骨和下颌骨形状显示与CS增加相关的弱生长变化。在冬季的平均身体大小的减少，发现只有在男性从春季队列。没有显着差异，发现从春季和秋季队列的成人样本在外部或头骨形态。我们认为，食物资源不足是导致生长抑制的主要因素，在秋季队列和假设，冬季生存能力，这是有关的生殖竞争，解释了身体尺寸减少在冬季观察到的男性从春季队列。
Abstract We examined growth differences in external and skull morphology between spring and autumn cohorts of the large Japanese field mouse (Apodemus speciosus). We analyzed 271 specimens from the Kyoto population, which had 2 discrete breeding periods, spring and autumn. Growth differences between the 2 cohorts were found in body weight and head and body length. The spring cohort grew rapidly in the summer following birth, whereas the autumn cohort showed growth inhibition during the autumn and winter soon after birth and rapid growth the following spring and summer. The centroid sizes (CSs) of the cranium and mandible showed similar growth patterns, but no significant postweaning growth was observed in ear length or hind-foot length. Cranium and mandible shape showed weak growth changes related to increases in CS. Decreases in mean body size during the winter were found only in males from the spring cohort. No significant difference was found between adult samples from the spring and autumn cohorts in either external or skull morphology. We suggest that insufficient food resources is the major factor causing the growth inhibition in the autumn cohort and postulate that winter survivability, which is related to reproductive competition, explains the body-size reduction in winter observed in males from the spring cohort.