Abstract
Our knowledge of the main determinants of invasion success is still incomplete. Among these factors, the effects of biological traits, including fecundity, longevity and dispersal in newly colonised regions, are pivotal. However, while numerous studies have considered ecological and evolutionary impacts of non-native species, their biology often remains understudied. Despite the continuous geographic expansion of Merizodus soledadinus (Coleoptera: Carabidae) at the Kerguelen Islands over recent decades, the main life-history parameters of this species are unknown. We determined adult longevity under controlled conditions, monitored seasonal activity through pitfall trappings, and analysed temporal variations of egg load and body reserves in field-collected individuals. The median adult life span (LT50) was 241 days, with maximum longevity of 710 days (N = 500). Females carried eggs throughout the year (8.94 ± 3.56 eggs per female), and it was not possible to pinpoint any clear egg-laying period. Year-round trappings demonstrated continuous activity of adults over seasons, with a peak during the austral summer that may arguably be associated with higher temperatures. Body stores (glycogen and proteins) did not vary significantly through the year, suggesting that adults feed continuously despite different prey availability between summer and winter, possibly via diet shifts. The amount of triglycerides increased at onset of summer, which may be associated with higher summer locomotor activity and/or more intense predation and reproduction.
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Acknowledgements
The French Polar Institute Paul-Emile Victor that supports our program IPEV 136 ‘Subanteco’ is warmly thanked. This study was granted by InEE-CNRS (Enviromics call, ‘ALIENS’; Zone Atelier Antarctique et Subantarctique). Part of the experiments were conducted at the ABGC platform (UMR CNRS EcoBio). Our samplers and breeders of Merizodus soledadinus at Port-aux-Français from 2013 to 2015—Elsa Day, Lauriane Laville, Solène Lebreton and Camille Thomas—are warmly thanked.
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300_2017_2134_MOESM1_ESM.pdf
Tab.ESM_1 Summary of the hand-collected samples used to investigate the reproductive status of females during the year. The number of individuals captured is pooled for each month if the number of samples per month exceeds one. The sex ratio of each month is calculated as the proportion of females per sample (PDF 184 kb)
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Fig.ESM_2 Mean egg load in dissected female Merizodus soledadinus sampled monthly between December 2010 and March 2012 (20 individuals per sampling date, when possible) (PDF 222 kb)
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Ouisse, T., Laparie, M., Lebouvier, M. et al. New insights into the ecology of Merizodus soledadinus, a predatory carabid beetle invading the sub-Antarctic Kerguelen Islands. Polar Biol 40, 2201–2209 (2017). https://doi.org/10.1007/s00300-017-2134-z
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DOI: https://doi.org/10.1007/s00300-017-2134-z