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Lucie Rose Charline Lemiere
Stipendiat
- E-post
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lucie.lemiere@inn.no
- Telefonnummer
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+47 62 51 76 51
Fakultet for anvendt økologi, landbruksfag og bioteknologi
PhD kandidater- Institutt for skog og utmarksfag
Studiested Evenstad
Kort om
I have graduated from veterinary school (Vetagro-Sup, France) in 2020 and completed further education with a master's degree in ecology and ecophysiology (University of Strasbourg, France) in 2021. I started a PhD in applied ecology at INN (campus Evenstad) within the One Health and Ecophysiology group in January 2022. My work focuses on the reproductive ecophysiology and phenology of Scandinavian moose and brown bears in the context of climate change.
Publikasjoner
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Lemiere, Lucie; Thiel, Alexandra; Fuchs, Boris; Gilot-Fromont, Emmanuelle; Hertel, Anne G. & Friebe, Andrea
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(2022).
Extrinsic and intrinsic factors drive the timing of gestation and reproductive success of Scandinavian brown bears.
Frontiers in Ecology and Evolution.
ISSN 2296-701X.
10.
doi:
10.3389/fevo.2022.1045331.
Fulltekst i vitenarkiv
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Introduction: Climate change is altering the reproductive phenology of many
organisms, but the factors that influence the timing of gestation in ursids are
still poorly understood. Higher temperatures in spring are already causing an
earlier den exit in some brown bear populations, and a temporal mismatch
between hibernation and reproduction could have dramatic consequences
for reproductive success. Therefore, understanding the factors that control
the timing of these events is important to forecast the consequences of
climate change on population growth rates.
Methods: In this study, we used abdominal temperature loggers and GPS
collars with acceleration sensors on 23 free-ranging pregnant female brown
bears living in two areas in Sweden (61◦N and 67◦N latitude) to pinpoint
hibernation and reproductive events. We investigated how intrinsic and
extrinsic factors influence the termination of embryonic diapause and
parturition, as well as their impact on reproductive success.
Results: The termination of embryonic diapause was later in the northern
area compared to the southern area and occurred earlier when ambient
temperature at den entry was higher in both areas. In the southern area,
young adults (i.e., females = 7 years old) had a delayed parturition when
bilberry abundance was low the year of mating. Additionally, young adults had
a lower reproductive success than adults and their probability to reproduce
successfully was dependent on bilberry abundance, whereas adult females
were not affected by this parameter.
Discussion: As den exit occurs later in the northern study area, we suggest
that a later parturition might ensure that females lactate their cubs in the den
for a reasonable amount of time while fasting. Similarly, a later parturitioncombined with an earlier emergence could allow young adults to spend
less time in the den lactating if they could not reach an optimal body
condition prior to hibernation. But as a result, their cubs are younger and
more vulnerable when they leave the den leading to lower survival rates. Our
results suggest that a decreased berry abundance in the fall could impact
the reproductive and hibernation phenology of Scandinavian brown bear
females and lead to a lower cub survival with potential consequences on the
population dynamics.
biologging, embryonic diapause, reproductive phenology, reproductive success,
Ursus arctos
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Høgskolen i Innlandet
Postboks 400 Vestad
2418 Elverum