DuboisBlouin-DemersShipleyEtAl2009

Référence

Dubois, Y., Blouin-Demers, G., Shipley, B. and Thomas, D. (2009) Thermoregulation and habitat selection in wood turtles Glyptemys insculpta: chasing the sun slowly. Journal of Animal Ecology, 78(5):1023-1032.

Résumé

P>It is widely accepted that reptiles are able to regulate behaviourally their body temperature (T-b), but this generalization is primarily based on studies of lizards and snakes in the temperate zone. Because the precision of T-b regulation may vary considerably between taxa and over geographical ranges, studies of semi-terrestrial turtles in climatic extremes are relevant to the understanding of reptilian thermoregulation. We studied thermoregulation in 21 free-ranging wood turtles (Glyptemys insculpta) at the northern limit of their range in Quebec, using miniature data loggers to measure their internal T-b and external temperature (T-ext) continuously. We simultaneously recorded the available operative environmental temperature (T-e) using 23 physical models randomly moved within each habitat type, and we located turtles using radiotelemetry. The habitat used by wood turtles was thermally constraining and the target temperature (T-set) was only achievable by basking during a short 5-h time window on sunny days. Wood turtles did show thermoregulatory abilities, as determined by the difference between turtle T-b distribution and the null distribution of T-e that resulted in T-b closer to T-set. Although most individuals regulated their T-b between 09.00 h and 16.00 h on sunny days, regulation was imprecise, as indicated by an index of thermoregulation precision (vertical bar T-b - T-set vertical bar). The comparison of habitat use to availability indicated selection of open habitats. The hourly mean shuttling index (vertical bar T-ext - T-b vertical bar) suggested that turtles used sun/shade shuttling from 09.00 to 16.00 h to elevate their T-b above mean T-e. Based on laboratory respirometry data, turtles increased their metabolic rate by 20-26% over thermoconformity, and thus likely increased their energy gain which is assumed to be constrained by processing rate at climatic extremes.

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@ARTICLE { DuboisBlouin-DemersShipleyEtAl2009,
    AUTHOR = { Dubois, Y. and Blouin-Demers, G. and Shipley, B. and Thomas, D. },
    TITLE = { Thermoregulation and habitat selection in wood turtles Glyptemys insculpta: chasing the sun slowly },
    JOURNAL = { Journal of Animal Ecology },
    YEAR = { 2009 },
    VOLUME = { 78 },
    PAGES = { 1023-1032 },
    NUMBER = { 5 },
    MONTH = { sep },
    AF = { Dubois, Y.EOLEOLBlouin-Demers, G.EOLEOLShipley, B.EOLEOLThomas, D. },
    C1 = { [Dubois, Y.; Shipley, B.; Thomas, D.] Univ Sherbrooke, Dept Biol, Sherbrooke, PQ J1K 2R1, Canada.EOLEOL[Blouin-Demers, G.] Univ Ottawa, Dept Biol, Ottawa, ON K1N 6N5, Canada. },
    DE = { behavioural thermoregulation; biologging; energetics; terrestrial turtle },
    DI = { 10.1111/j.1365-2656.2009.01555.x },
    EM = { donald.thomas@usherbrooke.ca },
    FU = { National Sciences and Engineering Research Council of Canada ; CanadaEOLEOLTrust Friend of the Environment Fund },
    FX = { We thank P.A. Bernier, N. Delelis, W. Bertacchi, M. Gauthier, C.EOLEOLDaigle, J. Jutras and many volunteers for their help in the field andEOLEOLthe analysis. We also thank the Dr. Jacques Dancosse of the Biodome deEOLEOLMontreal for the surgical implantation of data loggers. This study wasEOLEOLsupported by a grant (D.T.) and a scholarship (Y.D.) from the NationalEOLEOLSciences and Engineering Research Council of Canada and by a grant toEOLEOLthe Biodome de Montreal from the Canada Trust Friend of the EnvironmentEOLEOLFund. We are grateful to M. Angilletta, J. Roe, and 2 anonymousEOLEOLreviewers for insightful comments that improved this manuscript. },
    GA = { 477PT },
    J9 = { J ANIM ECOL },
    JI = { J. Anim. Ecol. },
    LA = { English },
    NR = { 68 },
    PA = { COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA },
    PG = { 10 },
    PI = { MALDEN },
    RP = { Thomas, D, Univ Sherbrooke, Dept Biol, Sherbrooke, PQ J1K 2R1, Canada. },
    SC = { Ecology; Zoology },
    SN = { 0021-8790 },
    TC = { 0 },
    UT = { ISI:000268531700016 },
    ABSTRACT = { P>It is widely accepted that reptiles are able to regulate behaviourally their body temperature (T-b), but this generalization is primarily based on studies of lizards and snakes in the temperate zone. Because the precision of T-b regulation may vary considerably between taxa and over geographical ranges, studies of semi-terrestrial turtles in climatic extremes are relevant to the understanding of reptilian thermoregulation. We studied thermoregulation in 21 free-ranging wood turtles (Glyptemys insculpta) at the northern limit of their range in Quebec, using miniature data loggers to measure their internal T-b and external temperature (T-ext) continuously. We simultaneously recorded the available operative environmental temperature (T-e) using 23 physical models randomly moved within each habitat type, and we located turtles using radiotelemetry. The habitat used by wood turtles was thermally constraining and the target temperature (T-set) was only achievable by basking during a short 5-h time window on sunny days. Wood turtles did show thermoregulatory abilities, as determined by the difference between turtle T-b distribution and the null distribution of T-e that resulted in T-b closer to T-set. Although most individuals regulated their T-b between 09.00 h and 16.00 h on sunny days, regulation was imprecise, as indicated by an index of thermoregulation precision (vertical bar T-b - T-set vertical bar). The comparison of habitat use to availability indicated selection of open habitats. The hourly mean shuttling index (vertical bar T-ext - T-b vertical bar) suggested that turtles used sun/shade shuttling from 09.00 to 16.00 h to elevate their T-b above mean T-e. Based on laboratory respirometry data, turtles increased their metabolic rate by 20-26% over thermoconformity, and thus likely increased their energy gain which is assumed to be constrained by processing rate at climatic extremes. },
    KEYWORDS = { SNAKES ELAPHE-OBSOLETA; RETREAT-SITE SELECTION; NORTHERN WATER SNAKES; CLEMMYS-INSCULPTA; THERMAL ECOLOGY; BEHAVIORAL THERMOREGULATION; PAINTED TURTLES; ECTOTHERM THERMOREGULATION; ENVIRONMENTAL CONSTRAINTS; OPERATIVE TEMPERATURES },
    OWNER = { sobru1 },
    PUBLISHER = { Wiley-Blackwell Publishing, Inc },
    TIMESTAMP = { 2009.08.14 },
}

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