Eggshell spots are an important cue for the egg retrieval behavior in two tit species

IF 1.9 2区 生物学 Q3 BEHAVIORAL SCIENCES
Jianping Liu, Laikun Ma, Xiwen Yang, Bin Li, Xingyu Wang, Wei Liang
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Abstract

It is a common occurrence for incubating female ground- or cavity-nesting birds to accidentally roll their own eggs out of the nest cup. To correctly roll eggs that are not in the nest cup back to the nest, birds must be able to discriminate between their eggs and things around their nests that could be easily confused for their eggs (e.g., egg-shaped stones or other birds’ eggs). Moreover, there may be a strong interaction between egg retrieval and egg rejection behaviors in the context of avian brood parasitism where recognition and rejection of alien eggs is an effective means for hosts to defend against cuckoo parasitism. It has been shown that green-backed tits (Parus monticolus) and Japanese tits (P. minor) in China have strong egg recognition ability and are able to reject nonmimetic eggs in the nest. Eggshell spots play an essential role in the egg rejection behavior of these two tit hosts. This study investigated the egg retrieval behavior of green-backed tits and Japanese tits by adding one experimental egg to the nest corner to explore whether eggshell spots also play a role in the process of egg retrieval. The results revealed significant differences in the retrieval rates of white-rumped munia (Lonchura striata) eggs painted with spots, Japanese tits’ own true eggs, and unpainted, pure white-white-rumped munia eggs. The retrieval rate of white-white-rumped munia eggs was significantly lower than that of spotted white-rumped munia eggs and Japanese tits’ own spotted eggs. For green-backed tits, the retrieval rate of spotted white-rumped munia eggs in the nest corner was significantly higher than that of pure white-white-rumped munia eggs, while the rejection rate of spotted white-rumped munia eggs was significantly lower than that of pure white-white-rumped munia eggs. These findings indicate that eggshell spots play a key role in the egg retrieval of green-backed tits and Japanese tits.

Abstract Image

蛋壳斑点是两种山雀取卵行为的重要线索
孵化地面或洞穴筑巢的雌性鸟类不小心把自己的蛋从巢杯里滚出来是很常见的。为了正确地将不在巢杯中的蛋滚回巢中,鸟类必须能够区分它们的蛋和巢周围容易与它们的蛋混淆的东西(例如蛋形石头或其他鸟的蛋)。此外,在鸟类窝寄生的情况下,取卵和拒卵行为之间可能存在强烈的相互作用,识别和拒卵是宿主抵御杜鹃寄生的有效手段。研究表明,中国的绿背山雀(Parus monticolus)和日本山雀(P.minor)具有较强的卵子识别能力,能够在巢中拒绝非仿生卵子。蛋壳斑点在这两种山雀宿主的卵子排斥行为中起着重要作用。本研究通过在巢角添加一个实验蛋来调查绿背山雀和日本山雀的取卵行为,以探讨蛋壳斑点是否也在取卵过程中发挥作用。结果显示,涂有斑点的白臀munia(Lonchura striata)蛋、日本山雀自己的真蛋和未涂过斑点的纯白臀muna蛋的回收率存在显著差异。白臀munia蛋的回收率显著低于斑点白臀muna蛋和日本山雀自己的斑点蛋。对于绿背山雀,窝角斑点白臀munia蛋的回收率显著高于纯白臀munina蛋,而斑点白臀monia蛋的排异率显著低于纯白臀monina蛋。这些发现表明,蛋壳斑点在绿背山雀和日本山雀的取卵过程中起着关键作用。
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来源期刊
Animal Cognition
Animal Cognition 生物-动物学
CiteScore
4.50
自引率
18.50%
发文量
125
审稿时长
4-8 weeks
期刊介绍: Animal Cognition is an interdisciplinary journal offering current research from many disciplines (ethology, behavioral ecology, animal behavior and learning, cognitive sciences, comparative psychology and evolutionary psychology) on all aspects of animal (and human) cognition in an evolutionary framework. Animal Cognition publishes original empirical and theoretical work, reviews, methods papers, short communications and correspondence on the mechanisms and evolution of biologically rooted cognitive-intellectual structures. The journal explores animal time perception and use; causality detection; innate reaction patterns and innate bases of learning; numerical competence and frequency expectancies; symbol use; communication; problem solving, animal thinking and use of tools, and the modularity of the mind.
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