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Body mass is not a useful measure of adaptation to captivity in the Orange-bellied Parrot Neophema chrysogaster
Emu - Austral Ornithology ( IF 0.9 ) Pub Date : 2019-12-12 , DOI: 10.1080/01584197.2019.1698302
Dejan Stojanovic 1 , Catherine M. Young 1 , Carolyn J. Hogg 2 , Rob Heinsohn 1
Affiliation  

ABSTRACT In captivity, novel selective pressures can lead to divergence from the wild source population, which can be a liability for animals released into the wild. Easily measured indices of change, like body mass, might be important for early detection of adaptation to captivity. We hypothesised that for species subject to long-term captive breeding, body mass may be a useful proxy for detecting morphological adaptations to captivity. We test this (and alternative explanatory variables) with 22 years of pedigree data on Orange-bellied Parrots Neophema chrysogaster and predict that adult body mass would change over successive generations in captivity. The best model of adult body mass showed a relationship with maternal effects both directly (heavier mothers produced heavier offspring) and indirectly (different founding maternal lineages produced heavier or lighter descendants), plus circumstances in the year of birth (e.g. years with better food quality produced heavier birds). Body mass did not change with increasing generations of captive breeding. Our results suggest that either adaptation to captivity has not occurred or, if it has, body mass is too coarse an index to detect it. Captive breeding programmes should directly measure traits of interest and ideally compare these to traits of wild birds to identify an ideal morphological baseline.

中文翻译:

体重不是橙腹鹦鹉 Neophema chrysogaster 适应圈养的有用指标

摘要在圈养中,新的选择压力会导致与野生来源种群的分歧,这可能是释放到野外的动物的负担。容易测量的变化指数,如体重,可能对早期发现对圈养的适应很重要。我们假设,对于长期圈养繁殖的物种,体重可能是检测圈养形态适应的有用指标。我们使用橙腹鹦鹉 Neophema chrysogaster 的 22 年谱系数据对此(以及替代解释变量)进行测试,并预测成年鹦鹉的体重会随着圈养的连续几代而发生变化。成人体重的最佳模型显示了与母体效应的直接关系(体重较重的母亲产生的后代较重)和间接(不同的母系血统产生较重或较轻的后代),加上出生年份的情况(例如食物质量较好的年份)产生更重的鸟)。体重没有随着圈养繁殖代数的增加而改变。我们的结果表明,要么对圈养的适应没有发生,要么,如果发生了,体重是一个太粗糙的指标,无法检测到它。圈养育种计划应直接测量感兴趣的特征,最好将这些特征与野生鸟类的特征进行比较,以确定理想的形态基线。体重没有随着圈养繁殖代数的增加而改变。我们的结果表明,要么对圈养的适应没有发生,要么,如果发生了,体重是一个太粗糙的指标,无法检测到它。圈养育种计划应直接测量感兴趣的特征,最好将这些特征与野生鸟类的特征进行比较,以确定理想的形态基线。体重没有随着圈养繁殖代数的增加而改变。我们的结果表明,要么对圈养的适应没有发生,要么,如果发生了,体重是一个太粗糙的指标,无法检测到它。圈养育种计划应直接测量感兴趣的特征,最好将这些特征与野生鸟类的特征进行比较,以确定理想的形态基线。
更新日期:2019-12-12
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