Impacts of brood parasitism by shiny cowbird Molothrus bonariensis on the breeding success of a small host, the black-backed water tyrant Fluvicola albiventer  

作　　者：Lorena Vanesa Sovrano Evelina Jesica Leon Rodrigo Ezequiel Lorenzón Pamela Fernanda Olguin Adolfo Héctor Beltzer Alejandro Raúl Giraudo 

机构地区：[1]Laboratorio de Biodiversidad y Conservacion de Tetrapodos,Instituto Nacional de Limnologia(INALI,CONICET-UNL),Paraje El Pozo s/n,Santa Fe(3000),Argentina [2]Departamento de Biologia,Universidad Autonoma de Entre Rios,Km 10.5 RP 11,Oro Verde(3100),Entre Rios,Argentina [3]Departamento de Biologia,Universidad Nacional del Litoral,Facultad de Humanidades y Ciencias,Paraje Ei Pozo s/n,Santa Fe(3000),Argentina

出　　处：《Current Zoology》2024年第4期539-547,共9页动物学报（英文版）

摘　　要：The shiny cowbird Molothrus bonariensis parasitizes many species with different life-history traits and has a detrimental effect on the survival of the progeny of the hosts.In response,hosts have developed numerous antiparasitic defenses.Here,we examined the effects of brood parasitism by shiny cowbird on the clutch and brood sizes(83 nests)in a small host,the black-backed water tyrant Fluvicola albiventer.We also studied whether the death of parasite nestlings was related to the care of the foster parents and whether the host had any antiparasitic defense against the shiny cowbird.Our results indicate that brood parasitism significantly decreased the host hatching and fledging successes.The majority of nest failures(57%)were caused by brood parasitism.Shiny cowbird parasitism occurred in 52%of nests and the intensity of parasitism was 1.23±0.53 eggs per parasitized nest.Of the total host eggs,54%were damaged.During the incubation stage,20 nests(47%)were abandoned because of egg punctures by shiny cowbirds females.Only two parasitic fledglings were recorded,while the remaining nestlings either died from starvation(n=12)or predation(n=3).Foster parents abandoned parasitic nestlings between 5 and 10 days old.Our findings demonstrate that the shiny cowbird has very low rates of fledging success when parasitizing black-backed water tyrant.Also,parasitism had a high reproductive cost in the black-backed water tyrant because a very low proportion(7%)of the parasitized nests(n=43)were successful.

关 键 词：brood parasitism host defenses nest desertion shiny cowbird small host. 

分 类 号：Q95[生物学—动物学]