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Consequences of space sharing on individual phenotypes in the New Zealand hihi

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Abstract

In heterogeneous habitats, individuals sharing a larger part of their home-range are also likely to live in a very similar environment. This ‘common environment’ effect can generate phenotypic similarities between neighbours and lead to the structuring of phenotypes through the habitat. In this study, we used an intensely monitored population of hihi (or stitchbird, Notiomystis cincta) from New Zealand, to assess whether home-range overlap and genetic relatedness between birds could generate phenotypic resemblance for a wide panel of morphological and life-history traits. Using a multiple-matrix animal model approach to partition the phenotypic variance present in the population, we included a spatial matrix measuring home range overlap between birds and estimated the proportion of variance attributable to space sharing. We detected a clear contribution of space sharing to the overall phenotypic similarity for two traits: hatchling mass and laying date. We also confirmed the very low estimates of genetic heritability already found for this species. These results suggest that models including space sharing can offer further insight into the determinants of individual differences in phenotype. In particular, the spatial matrix helps to capture fine-scale variation of the environment that classic animal models would potentially miss or miss-assign. In this species, results also suggest that small but significant genetic heritability estimates are not upwardly biased by clustering of close relatives in space.

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Acknowledgements

We are thankful to all volunteers and staff that contributed to supporting and monitoring the hihi population, especially Danielle Shanahan, Director—Centre for People and Nature. We are grateful to the Hihi Recovery Group, the Wellington City Council and the Karori Sanctuary Trust for supporting the long-term monitoring of the Zealandia hihi population. Finally, we would like to thank Mhairi McCready, Vix Franks and Rose Thorogood for helpful discussions about the study. A.R. was supported by a grant from the Science Faculty Research Development Fund of the University of Auckland. A.W.S., P.dW., P.B. and J.G.E. were supported by a Marsden Grant (UOA1408) from the New Zealand Royal Society Te Apārangi. A.W.S. was also supported by a National Science Challenge Biological Heritage Project Grant. Sampling and research permits for the collection and analysis of blood and tissue and have been obtained from the New Zealand Department of Conservation; permit numbers WE/32213/FAU and WE/246/RES.

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Correspondence to A. Rutschmann.

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Rutschmann, A., de Villemereuil, P., Brekke, P. et al. Consequences of space sharing on individual phenotypes in the New Zealand hihi. Evol Ecol 34, 821–839 (2020). https://doi.org/10.1007/s10682-020-10063-z

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  • DOI: https://doi.org/10.1007/s10682-020-10063-z

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