Cristofari Robin

No Thumbnail Available
Last Name
Cristofari
First Name
Robin
ORCID

Filters

2016 - 2019 2 2020 - 2024 1
3
3
Reset filters

Settings

Search Results

Now showing 1 - 3 of 3
  • Article
    Full circumpolar migration ensures evolutionary unity in the Emperor penguin
    (Nature Publishing Group, 2016-06-14) Cristofari, Robin ; Bertorelle, Giorgio ; Ancel, André ; Benazzo, Andrea ; Le Maho, Yvon ; Ponganis, Paul J. ; Stenseth, Nils Christian ; Trathan, Phil N. ; Whittington, Jason D. ; Zanetti, Enrico ; Zitterbart, Daniel ; Le Bohec, Céline ; Trucchi, Emiliano
    Defining reliable demographic models is essential to understand the threats of ongoing environmental change. Yet, in the most remote and threatened areas, models are often based on the survey of a single population, assuming stationarity and independence in population responses. This is the case for the Emperor penguin Aptenodytes forsteri, a flagship Antarctic species that may be at high risk continent-wide before 2100. Here, using genome-wide data from the whole Antarctic continent, we reveal that this top-predator is organized as one single global population with a shared demography since the late Quaternary. We refute the view of the local population as a relevant demographic unit, and highlight that (i) robust extinction risk estimations are only possible by including dispersal rates and (ii) colony-scaled population size is rather indicative of local stochastic events, whereas the species’ response to global environmental change is likely to follow a shared evolutionary trajectory.
  • Article
    The emperor penguin - vulnerable to projected rates of warming and sea ice loss
    (Elsevier, 2019-10-08) Trathan, Phil N. ; Wienecke, Barbara ; Barbraud, Christophe ; Jenouvrier, Stephanie ; Kooyman, Gerald L. ; Le Bohec, Céline ; Ainley, David G. ; Ancel, André ; Zitterbart, Daniel ; Chown, Steven L. ; LaRue, Michelle ; Cristofari, Robin ; Younger, Jane ; Clucas, Gemma V. ; Bost, Charles-Andre ; Brown, Jennifer A. ; Gillett, Harriet J. ; Fretwell, Peter T.
    We argue the need to improve climate change forecasting for ecology, and importantly, how to relate long-term projections to conservation. As an example, we discuss the need for effective management of one species, the emperor penguin, Aptenodytes forsteri. This species is unique amongst birds in that its breeding habit is critically dependent upon seasonal fast ice. Here, we review its vulnerability to ongoing and projected climate change, given that sea ice is susceptible to changes in winds and temperatures. We consider published projections of future emperor penguin population status in response to changing environments. Furthermore, we evaluate the current IUCN Red List status for the species, and recommend that its status be changed to Vulnerable, based on different modelling projections of population decrease of ≥50% over the current century, and the specific traits of the species. We conclude that current conservation measures are inadequate to protect the species under future projected scenarios. Only a reduction in anthropogenic greenhouse gas emissions will reduce threats to the emperor penguin from altered wind regimes, rising temperatures and melting sea ice; until such time, other conservation actions are necessary, including increased spatial protection at breeding sites and foraging locations. The designation of large-scale marine spatial protection across its range would benefit the species, particularly in areas that have a high probability of becoming future climate change refugia. We also recommend that the emperor penguin is listed by the Antarctic Treaty as an Antarctic Specially Protected Species, with development of a species Action Plan.
  • Article
    Remote sensing of emperor penguin abundance and breeding success
    (Nature Research, 2024-05-29) Winterl, Alexander ; Richter, Sebastian ; Houstin, Aymeric ; Barracho, Teo ; Boureau, Matthieu ; Cornec, Clement ; Couet, Douglas ; Cristofari, Robin ; Eiselt, Claire ; Fabry, Ben ; Krellenstein, Adelie ; Mark, Christoph ; Mainka, Astrid ; Menard, Delphine ; Morinay, Jennifer ; Pottier, Susie ; Schloesing, Elodie ; Le Bohec, Celine ; Zitterbart, Daniel P.
    Emperor penguins (Aptenodytes forsteri) are under increasing environmental pressure. Monitoring colony size and population trends of this Antarctic seabird relies primarily on satellite imagery recorded near the end of the breeding season, when light conditions levels are sufficient to capture images, but colony occupancy is highly variable. To correct population estimates for this variability, we develop a phenological model that can predict the number of breeding pairs and fledging chicks, as well as key phenological events such as arrival, hatching and foraging times, from as few as six data points from a single season. The ability to extrapolate occupancy from sparse data makes the model particularly useful for monitoring remotely sensed animal colonies where ground-based population estimates are rare or unavailable.