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. 2020 Aug 17;10(18):10219-10229.
doi: 10.1002/ece3.6684. eCollection 2020 Sep.

Best environmental predictors of breeding phenology differ with elevation in a common woodland bird species

Marjorie Bison  1 , Nigel G Yoccoz  2 , Bradley Carlson  1 , Geoffrey Klein  1   3 , Idaline Laigle  1 , Colin Van Reeth  1 , Daphné Asse  1   4 , Anne Delestrade  1
Affiliations

Best environmental predictors of breeding phenology differ with elevation in a common woodland bird species

Marjorie Bison et al. Ecol Evol. .

Abstract

Temperatures in mountain areas are increasing at a higher rate than the Northern Hemisphere land average, but how fauna may respond, in particular in terms of phenology, remains poorly understood. The aim of this study was to assess how elevation could modify the relationships between climate variability (air temperature and snow melt-out date), the timing of plant phenology and egg-laying date of the coal tit (Periparus ater). We collected 9 years (2011-2019) of data on egg-laying date, spring air temperature, snow melt-out date, and larch budburst date at two elevations (~1,300 m and ~1,900 m asl) on a slope located in the Mont-Blanc Massif in the French Alps. We found that at low elevation, larch budburst date had a direct influence on egg-laying date, while at high-altitude snow melt-out date was the limiting factor. At both elevations, air temperature had a similar effect on egg-laying date, but was a poorer predictor than larch budburst or snowmelt date. Our results shed light on proximate drivers of breeding phenology responses to interannual climate variability in mountain areas and suggest that factors directly influencing species phenology vary at different elevations. Predicting the future responses of species in a climate change context will require testing the transferability of models and accounting for nonstationary relationships between environmental predictors and the timing of phenological events.

Keywords: French Alps; budburst; climate change; coal tit; elevation; laying date; mountain; snow melt‐out.

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Conflict of interest statement

None declared.

Figures

Figure 1
Figure 1
Location map of the nest boxes, climate stations, and larches surveyed. Larches surveyed at the low elevation site are not presented on the map as they are located 5.8 km away to the south, in Montroc
Figure 2
Figure 2
Egg‐laying date, mean larch budburst date, snow melt‐out date, and mean spring temperature variation between 2011 and 2019. 95% confidence intervals are shown for egg‐laying date
Figure 3
Figure 3
Plausible path analyses for each site (low and high elevation). Slopes (β) are specified with their standard errors. Significant paths are in bold
See this image and copyright information in PMC

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