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2015 ; 10
(12
): e0144587
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Interactions between a Candidate Gene for Migration (ADCYAP1), Morphology and Sex
Predict Spring Arrival in Blackcap Populations
#MMPMID26684459
Mettler R
; Segelbacher G
; Schaefer HM
PLoS One
2015[]; 10
(12
): e0144587
PMID26684459
show ga
Avian research has begun to reveal associations between candidate genes and
migratory behaviors of captive birds, yet few studies utilize genotypic,
morphometric, and phenological data from wild individuals. Previous studies have
identified an association between ADCYAP1 polymorphism and autumn migratory
behavior (restlessness, or zugunruhe), but little is known about the relationship
between ADCYAP1 and spring migratory behavior. The timing of spring migration and
arrival to the breeding ground are phenological traits which could be
particularly favorable for establishing territories and acquiring mates, thus
important to fitness and reproductive success. Here, we investigated how
individual genotypic ADCYAP1 variation and phenotypic variation (wing length and
shape) of blackcaps (Sylvia atricapilla) affect spring arrival date across nine
natural populations in Europe. We hypothesized that longer alleles should be
associated with earlier spring arrival dates and expected the effect on arrival
date to be stronger for males as they arrive earlier. However, we found that
longer wings were associated with earlier spring arrival to the breeding grounds
for females, but not for males. Another female-specific effect indicated an
interaction between ADCYAP1 allele size and wing pointedness on the response of
spring arrival: greater allele size had a positive effect on spring arrival date
for females with rounder wings, while a negative effect was apparent for females
with more pointed wings. Also, female heterozygotes with pointed wing tips
arrived significantly earlier than both homozygotes with pointed wings and
heterozygotes with round wings. Stable isotope ratios (?2H) of a subset of
blackcaps captured in Freiburg in 2011 allowed us also to assign individuals to
their main overwintering areas in northwest (NW) and southwest (SW) Europe. NW
males arrived significantly earlier to the Freiburg breeding site than both SW
males and females in 2011. NW females had more pointed wing tips compared to SW
females, but no difference in ADCYAP1 allele size was found between the different
migration routes.