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2016 ; 13
(ä): 16
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Egg rejection in blackbirds Turdus merula: a by-product of conspecific parasitism
or successful resistance against interspecific brood parasites?
#MMPMID27073406
Ruiz-Raya F
; Soler M
; Roncalli G
; Abaurrea T
; Ibáñez-Álamo JD
Front Zool
2016[]; 13
(ä): 16
PMID27073406
show ga
BACKGROUND: Traditional theory assumes that egg recognition and rejection
abilities arise as a response against interspecific brood parasitism (IBP).
However, rejection also appears in some species that are currently not exploited
by interspecific parasites, such as Turdus thrushes. Recent evidences suggest
that rejection abilities evolved in these species as a response to conspecific
brood parasitism (CBP). To test these two alternative hypotheses, we performed an
experimental study by parasitizing nests of the common blackbird (Turdus merula)
with conspecifics or heterospecific eggs under different risk of parasitism
(presence of interspecific or conspecific parasites near the nest). Common
blackbird is a potential host of the common cuckoo (Cuculus canorus) but suffers
low levels of CBP too. RESULTS: We found that blackbirds were able to recognize
and eject heterospecific eggs at high rates whereas most of conspecifics eggs
were not recognized and, therefore, accepted. Ejection rates of conspecific eggs
did not exceed 13 %, even in situations of high risk of CBP (blackbird female
placed near the nest), which contradict the main prediction derived from the CBP
hypothesis. Conversely, ejection rates of experimental eggs simulating IBP were
much higher (80-100 %). Furthermore, female blackbirds were more aggressive
towards cuckoos than towards blackbird dummies. CONCLUSIONS: Our results
considered together support the IBP hypothesis, indicating that recognition and
rejection of parasitic eggs in blackbirds have probably evolved due to previous
cuckoo parasitism. The current absence of IBP in blackbirds may be due to the
highly efficient rejection abilities in this species. Thus, these abilities have
been retained in absence of brood parasitism as a consequence of the low costs
involved for blackbirds, resulting in a successful resistance against
interspecific brood parasitism.