Specific responses of cuckoo hosts to different alarm signals according to breeding stage:a test of the offspring value hypothesis  

作　　者：Jiaojiao Wang Canchao Yang 

机构地区：[1]Ministry of Education Key Laboratory for Ecology of Tropical Islands,College of Life Sciences,Hainan Normal University,Haikou,571158,China

出　　处：《Current Zoology》2020年第6期649-655,共7页动物学报（英文版）

基　　金：funded by the Hainan Provincial Natural Science Foundation of China(2019RC189);the National Natural Science Foundation of China(No.31672303)to C.Y.;the Hainan Provincial Innovative Research Program for Graduates(Hyb2019-34)to J.W.

摘　　要：The selective pressure exerted by avian brood parasites forces their hosts to evolve specific defense strategies.When subject to brood parasite attack,avian hosts will often emit alarm calls.To date,few studies have examined whether and how host responses to different alarm calls indicative of different enemies vary with the hosts breeding stage.We carried out alarm call playback experiments during both the egg and nestling stages of the oriental reed warbler Acrocephalus orientals,a host of the common cuckoo Cuculus canorus.The playback exemplars were selected from recorded alarm calls of the warbler to the presenee of common cuckoos,sparrowhawks Accipiter nisus,and oriental turtle doves Streptopelia orientalis,which represented brood parasite,predator,and harmless control,respectively.The results showed that the oriental reed warblers did not discriminate alarm calls issued to different intruder types,but the intensity of the response was significantly higher in the nestling stage than in the egg stage.Attack behavior related to sparrowhawk alarm calls was absent in the egg stage,but aggressive behavior in creased dramatically and exceeded the attack frequency in response to the cuckoo alarm call in the nestling stage,implying a shift in the tradeoff between the parents'own survival and the loss of offspring.Alarm calls attracted a larger nu mber of con specifics tha n members of other species.In gen eral,the oriental reed warbler had consistently stronger responses to different alarm calls in the nestling stage than in the egg stage,supporting the offspring value hypothesis.

关 键 词：brood parasitism breeding stage functionally referential calls PLAYBACK 

分 类 号：Q958[生物学—动物学]