Interspecific aggression in Leucorrhinia dragonflies: a frequency-dependent discrimination threshold hypothesis
Interspecific aggression in Leucorrhinia dragonflies: a frequency-dependent discrimination threshold hypothesis
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白鼻蜻蜓的种间攻击：频率依赖的辨别阈值假设
DOI：
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发表时间：
1989
影响因子：
2.3
通讯作者：
Fred Singer
中科院分区：
文献类型：
--
作者：
Fred Singer
雄性Leucorrhythinia蜻蜓保卫领土免受同种和异种入侵者的侵害。对异性的防御是令人惊讶的，因为交配和产卵是唯一的活动，发生在领土上，和异性男性预计不会构成生殖威胁。L. frigida和L.完整的男性积极响应同等频率和强度对入侵的同种和异种。与此相反，L.近缘种雄性对同种的反应更积极。L. frigida和L.完整的男性可能会导致，因为领土男性评估入侵者（如L。Proxima）在入侵者飞进来时犹豫不决，在战术上处于不利地位。这种评估过程可能会导致领地雄性的战斗成功率降低。因此，有一个折衷的评估成本时，入侵者是同种和避免冲突时，入侵者是一个异种的好处。鉴于这种评估成本，男性的物种，很少遇到同种入侵者更有可能演变的物种歧视比男性的物种，通常遇到同种入侵者。
SummaryMale Leucorrhinia dragonflies defend territories from conspecific and heterospecific intruders. Defense against heterospecifics is surprising, as mating and oviposition are the only activities that occur on the territories, and heterospecific males are not expected to pose a reproductive threat. L. frigida and L. intacta males respond aggressively with equal frequency and intensity against intrusions by conspecifics and heterospecifics. In contrast, L. proxima males respond more aggressively against conspecifics. The apparent lack of species discrimination shown by L. frigida and L. intacta males may result because territorial males that assess intruders (as do L. proxima) suffer a tactical disadvantage from hesitating when an intruder flies in. This assessment process may lead to reduced fighting success by the territorial male. Thus there is a tradeoff between assessment cost incurred when the intruder is a conspecific and benefit gained from avoiding conflict when the intruder is a heterospecific. Given this assessment cost, males of species that only rarely encounter conspecific intruders are more likely to evolve species discrimination than males of species that commonly encounter conspecific intruders.