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:ITRSav8 (2020)  -  DOI: https://doi.org/10.3354/meps13461

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Performance of a warm-water limpet species towards its poleward range edge compared to a colder-water congener

M. H. Oróstica1,2,*, S. J. Hawkins3,4,5, B. R. Broitman6, S. R. Jenkins2

1Coastal Research Group, Department of Zoology and Entomology, Rhodes University, Grahamstown 6139, South Africa
2School of Ocean Sciences, Bangor University, Anglesey LL59 5AB, UK
3The Marine Biological Association of the UK, Plymouth PL1 2PB, UK
4Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton SO14 3ZH, UK
5School of Biological and Marine Sciences, Plymouth University, Plymouth PL4 8AA, UK
6Departamento de Ciencias, Facultad de Artes Liberales & Bioengineering Innovation Center, Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibañéz, 2562340 Viña del Mar, Chile
*Corresponding author:

ABSTRACT: The demography and individual performance of species at their range edges provide important insight into how climate warming is impacting species distributions. The boreal limpet Patella vulgata and the Lusitanian limpet P. depressa have overlapping geographic ranges and local distributions in Britain. We measured individual performance at the 2 leading edges of P. depressa distribution (North Wales and South/South-east England) and in non-range edge populations in South-west England. Individuals of P. depressa towards both leading edges were expected to have reduced growth rates and higher mortality rates when compared with non-range edge populations. Conversely, P. vulgata was expected to have equivalent performance across regions, coinciding with the centre of its range. Tagged individuals did not show between-species differences in growth and mortality over a 12 mo period. Nonetheless, individual growth rates and population mortality rates of both Patella species were higher towards the range edge of P. depressa in South/South-east England, when compared with populations at its poleward edge and those in South-west England. Further analysis showed that growth and mortality rates were higher in denser populations for both P. depressa and P. vulgata, with equivalent site-specific performance patterns for both species in all regions. Thus, performance patterns of P. depressa reflected local factors in the same way as P. vulgata, overriding patterns of declining performance expected towards species borders. Comparisons between key congeneric species and their unexpected patterns of performance across their ranges provide insights into processes setting species boundaries and thereby their responses to climate change.


KEY WORDS: Climate change · Range edges · Leading edge · Intertidal ecology · Patella spp.



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Cite this article as: Oróstica MH, Hawkins SJ, Broitman BR, Jenkins SR (2020) Performance of a warm-water limpet species towards its poleward range edge compared to a colder-water congener. Mar Ecol Prog Ser :ITRSav8. https://doi.org/10.3354/meps13461

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