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首页> 外文期刊>Journal of ornithology >Characteristics, abundance and fertility of orphan eggs of the Lesser Rhea (Pterocnemia-Rhea-pennata pennata): implications for conservation
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Characteristics, abundance and fertility of orphan eggs of the Lesser Rhea (Pterocnemia-Rhea-pennata pennata): implications for conservation

机译：小Rhea（Pterocnemia-Rhea-pennata pennata）的孤卵的特征，丰度和繁殖力：对保护的意义

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The Lesser Rhea (Pterocnemia-Rhea-pennata pennata) has a complex reproductive system that combines polygyny with sequential polyandry, in which males build the nest, fully incubate the eggs and care for the young. As occurs with the Greater Rhea (Rheaamericana), Lesser Rhea females sporadically lay eggs outside the nest ('orphan' eggs), which are not incubated and thus fail to hatch. We have examined the orphan eggs of Lesser Rhea over two separate breeding seasons to determine their abundance and fertility status. During 2004 and 2005, weekly ground searches for orphan eggs were conducted in a wild population of Lesser Rhea in northwestern Patagonia, Argentina. During these searches the total number of nests, eggs in each nest and orphan eggs laidoutside the nests was recorded. Orphan eggs represented approximately 7% of the total eggs laid in a breeding season. Six fresh orphan eggs were artificially incubated, four of them being fertile. Orphan eggs seemed to have two origins: some were laid near deserted nests in the early to mid-reproductive season; others were probably laid by first-time breeders and were found later in the reproductive season. Given the near-threatened status of the Lesser Rhea, harvesting and artificial incubation of orphan eggs, which otherwise would be unproductive, may contribute significantly to the conservation of this species, i.e., 'recovered' birds could be used for reintroduction or reinforcement of wild Lesser Rhea populations.
机译：小丽亚（Pterocnemia-Rhea-pennata pennata）有一个复杂的生殖系统，将一夫多妻制和一妻多夫制结合在一起，雄性在其中筑巢，完全孵化卵，并照顾幼仔。与大丽亚（Rheaamericana）一样，小丽亚雌性偶发地在巢外产卵（“孤儿”卵），这些卵没有被孵化，因此无法孵化。我们在两个单独的繁殖季节检查了小瑞亚的孤卵，以确定它们的丰度和繁殖状态。在2004年至2005年期间，每周在阿根廷巴塔哥尼亚西北部的小瑞亚野生种群中进行孤卵的地面探查。在这些搜索过程中，记录了巢的总数，每个巢中的卵和巢外的孤卵。孤卵占繁殖季节总卵数的7％。人工培育了六个新鲜的孤儿卵，其中四个是可育的。孤卵似乎有两个起源：在生殖早期到中期，一些卵产在荒芜的巢穴附近;其他可能是初次育种者产的，并在繁殖季节后期被发现。鉴于小瑞亚的​​濒临灭绝的状况，孤儿卵的收获和人工孵化（否则将无能为力）可能会极大地保护该物种，即，“恢复”的鸟类可用于重新引入或加强野生物种较少的Rhea种群。

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