Alexandre Millon

Alexandre Millon
Aix-Marseille Université | AMU · Institut Méditerranéen de Biodiversité et d'Ecologie marine et continentale (UMR 7263 IMBE)

PhD
Lecturer at Aix Marseille University (IMBE) in animal population dynamics and conservation biology

About

74
Publications
16,758
Reads
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1,190
Citations
Introduction
I am mainly interested in estimating the relative contribution of different factors affecting animal demography (both temporal and spatial components) in a context of global change. Those factors include change in prey dynamics, climate, habitat quality and availability and conservation action. On more applied grounds, I’m trying to promote, in collaboration with a variety of stakeholders, an adaptive management approach in order to optimise resource allocation dedicated to the conservation of vulnerable species, including game species.
Additional affiliations
September 2010 - present
Aix-Marseille Université
Position
  • Lecturer
April 2007 - August 2010
University of Aberdeen
Position
  • Post-doctoral Research Assistant

Publications

Publications (74)
Article
Full-text available
Calls for urgent action to conserve biodiversity under global change are increasing, and conservation of migratory species in this context poses special challenges. In the last two decades the Convention on the Conservation of Migratory Species of Wild Animals (CMS) has provided a framework for several subsidiary instruments including action plans...
Article
Full-text available
The decline of arthropod populations observed in many parts of the world is a major component of the sixth mass extinction with intensive agriculture being one of its main drivers. Biodiversity-friendly farming practices are taking centre stage in the recovery process. In vineyards, vegetation cover is commonly used for production purposes, to redu...
Preprint
Full-text available
The decline of arthropod populations observed in many parts of the world is a major component of the sixth mass extinction with intensive agriculture being one of its main drivers. Biodiversity-friendly farming practices are taking centre stage in the recovery process. In vineyards, vegetation cover is commonly used for production purposes, to redu...
Article
Hunting is a major threat to many species of wildlife. However, managing hunting systems to ensure their sustainability requires a thorough demographic knowledge about the impact of hunting. Here we develop a framework integrating ecological, modelling and sociological data to achieve a sustainability assessment of flying-fox hunting in New Caledon...
Technical Report
Full-text available
Ce document présente un modèle intégré de dynamique de population développé pour la gestion adaptative du grand tétras dans les Pyrénées françaises. Ce modèle comprend deux classes d'âge pour les femelles et trois pour les mâles et inclut cinq sous-populations distinctes. Il couvre la période 2004-2019. Sa structure et son ajustement reposent sur d...
Technical Report
Full-text available
Ce document présente un modèle intégré de dynamique de population développé pour la gestion adaptative du grand tétras dans les Pyrénées françaises. Ce modèle comprend deux classes d'âge pour les femelles et trois pour les mâles et inclut cinq sous-populations distinctes. Il couvre la période 2004-2019. Sa structure et son ajustement reposent sur d...
Poster
Full-text available
The impact of invasive predators on bats is still widely unknown, and generally not considered in bat conservation strategies. A recent literature review has shown that cats, Felis catus, in all their forms (domestic, stray or feral) prey upon many bat species far more frequently than is generally supposed including largest species (Pteropodids). H...
Article
en • Cats Felis catus, in all their forms (domestic, free‐roaming/stray and feral), have been identified as a major global threat to biodiversity, especially birds and small mammals. However, there has been little previous consideration of the extent and impact of predation of bats by cats, or of whether specific characteristics make certain speci...
Article
Biodiversity-friendly farming practices are taking centre stage, with herbicide use sparking major public debate on human health. Vegetation cover is increasingly used to enhance agroecosystem biodiversity and functions, providing important ecosystem services like biological pest control. However, further information is required on the relationship...
Article
Full-text available
Invasive feral cats threaten biodiversity at a global scale. Mitigating feral cat impacts and reducing their populations has therefore become a global conservation priority, especially on islands housing high endemic biodiversity. The New Caledonian archipelago is a biodiversity hotspot showing outstanding terrestrial species richness and endemism....
Article
Full-text available
Multiple brooding, reproducing twice or more per year, is an important component of life-history strategies. However, what proximate factors drive the frequency of multiple brooding and its fitness consequences for parents and offspring remains poorly known. Using long-term longitudinal data, we investigated double brooding in a barn owl population...
Article
Full-text available
Assessing population trends and their underlying factors is critical to propose efficient conservation actions. This assessment can be particularly challenging when dealing with highly mobile, shy and nocturnal animals such as flying-foxes. Here we investigated the dynamics of hunted populations of Pteropus ornatus and P. tonganus in the Northern P...
Data
Database gathering the results of the systematic litterature review associated to the paper entitled: Quantifying the contribution of immigration to population dynamics: a review of methods, evidence and perspectives in birds and mammals by Millon, Lambin, Devillard & Schaub, published in Biological Reviews 94, 2049-2067.
Article
Full-text available
Migratory species are subject to environmental variability occurring on breeding and wintering grounds. Estimating the relative contribution of environmental factors experienced sequentially during breeding and wintering, and their potential interaction, to the variation of survival is crucial to predict population viability of migratory species. H...
Article
Full-text available
The demography of a population is often reduced to the apparent (or local) survival of individuals and their realised fecundity within a study area defined according to logistical constraints rather than landscape features. Such demographics are then used to infer whether a local population contributes positively to population dynamics across a wid...
Poster
Full-text available
Understanding the spatial and temporal dynamic of a population and its underlying factors is critical to propose efficient conservation actions. This is all the more true since conservationists are dealing with highly mobile and vulnerable animals such as flying-foxes. In New Caledonia (South Pacific), ongoing studies are conducted on spatial ecolo...
Poster
Full-text available
Flying foxes in the Pacific are species with high ecological and/or cultural issues Nevertheless, flying foxes are often the largest native frugivorous and nectarivorous in islands and also possess the highest capacity of movement which suggests a high potential for seed dispersal and pollination Bats are the only terrestrial native mammals of the...
Article
Full-text available
A large number of young birds are caught each year shortly after having left the nest and subsequently brought to bird care centres. These birds are temporarily hand-raised before release. To date, the effectiveness of this action has remained largely unassessed. Here we monitored the fate of 119 rehabilitated Little Owls (Athene noctua) and found...
Article
Full-text available
Ten years after : synthesis of the national tagging scheme on Montagu’s Harriers in France. From 2007 to 2010, an ambitious wing-tagging program of juvenile Montagu’s Harriers has been carried out by a network of volunteers in France, aiming at tackling the species’ demography at a large spatial scale. Overall, 5 405 chicks have been marked just pr...
Article
Full-text available
Population monitoring traditionally relies on population counts, accounting or not for the issue of detectability. However, this approach does not permit to go into details on demographic processes. Therefore, Capture-Recapture (CR) surveys have become popular tools for scientists and practitioners willing to measure survival response to environmen...
Article
Full-text available
The ageing theory predicts fast and early senescence for fast-living species. We investigated whether the pattern of senescence of a medium-sized, fast-living and heavily-culled mammal, the red fox (Vulpes vulpes), fits this theoretical prediction. We used cross-sectional data from a large-scale culling experiment of red fox conducted over six year...
Poster
Full-text available
La viabilité des espèces gibiers endémiques dans les milieux insulaires représente un challenge pour les biologistes de la conservation, en particulier lorsqu'il est nécessaire de préserver les populations d'espèces exploitées à un niveau permettant de perpétuer les prélèvements associés à la culture et aux coutumes locales. C'est le cas de nombreu...
Article
Full-text available
Although a key demographic trait determining the spatial dynamics of wild populations, dispersal is notoriously difficult to estimate in the field. Indeed, dispersal distances obtained from the monitoring of marked individuals typically lead to biased estimations of dispersal kernels as a consequence of i) restricted spatial scale of the study area...
Article
Full-text available
A better understanding of the mechanisms driving superpredation, the killing of smaller mesopredators by larger apex predators, is important because of the crucial role superpredation can play in structuring communities and because it often involves species of conservation concern. Here we document how the extent of superpredation changed over time...
Article
Full-text available
Invasive rats (Rattus spp.) are known to have pervasive impacts on island birds, particularly on their nesting success. To conserve or restore bird populations, numerous invasive rat control or eradication projects are undertaken on islands worldwide. However, such projects represent a huge investment and the decision-making process requires proper...
Article
Full-text available
The impact of alien predator species on insular native biota has often been attributed to island prey naïveté (i.e. lack of, or inefficient, anti-predator behavior). Only rarely, however, has the concept of island prey naïveté been tested, and then only a posteriori (i.e. hundreds or thousands of years after alien species introduction). The presenc...
Article
Full-text available
Evidence is accumulating on the crucial role of spatial demographic processes, particularly immigration, in driving the viability of wild animal populations. However, the contribution of immigration is rarely accounted for when performing population viability analysis and evaluating the efficiency of conservation actions, which can lead to spurious...
Article
Full-text available
Species occurrence data provide crucial information for biodiversity studies in the current context of global environmental changes. Such studies often rely on a limited number of occurrence data collected in the field and on pseudo-absences arbitrarily chosen within the study area, which reduces the value of these studies. To overcome this issue,...
Data
Dataset information. Geographical coordinates of prospected cells, with presence data from the Anthos database (Anthos), presence or absence data from SVI prospection (SVI), and accurate geographical coordinates of SVI presence (PresenceX, PresenceY). The ‘type’ column indicates the use of data in GLMs and in validation against field data. (TXT)
Data
Geographic distribution of Bioclim PCA. Distribution of the three synthetic bioclimatic variables PC1 (A), PC2 (B) and PC3 (C) used to fit the GLM across Spain. (EPS)
Data
Environmental range for SVI and field data. Environmental range captured by field-collected (Anthos, upper panel) and SVI-collected (Street View, lower panel) occurrences: density distribution of environmental variables PC1 (left panel), PC2 (central panel) and PC3 (right panel) across presence locations. (TIF)
Article
Full-text available
In a context of increasing concern for biodiversity conservation but decreasing resources devoted to species management, measuring the impact of actions is critically needed so as to optimise conservation practices. Long-term longitudinal data collected on marked individuals allow for an assessment of the demographic response of a population to con...
Article
Full-text available
Seabirds are particularly vulnerable to introduced alien mammalian predators, especially invasive rats, which are the main contributors to seabird extinction and endangerment in many places worldwide. However, this appears context-dependent because, paradoxically, cases of apparent long-term coexistence between rats and some species of seabird have...
Conference Paper
Full-text available
Biological invasions represent one of the main threats to biodiversity, especially on islands where invasive are the first cause of biodiversity loss. Alien mammalian predators have been responsible for numerous island species extinctions worldwide, and feral cats are among the most successful and damaging invaders due to their generalist predatory...
Thesis
Full-text available
Towards an integrative management of animal populations: integrating immigration in the study of population dynamics and the evaluation of conservation and control actions. Due to the multiple interactions linking species together, human activities and animal species influence each other. Animal populations are therefore managed to favour long-term...
Article
Full-text available
1. Modern farming practices threaten wildlife in different ways, and failure to identify the complexity of multiple threats acting in synergy may result in ineffective management. To protect ground-nesting birds in farmland, monitoring and mitigating impacts of mechanical harvesting is crucial. 2. Here, we use 6 years of data from a nationwide volu...
Article
Seabirds are particularly vulnerable to introduced alien mammalian predators, especially invasive rats, which are the main contributors to seabird extinction and endangerment in many places worldwide. However, this appears context-dependent because, paradoxically, cases of apparent long-term coexistence between rats and some species of seabird have...
Article
Full-text available
Attempts to control predator numbers through spatially restricted culling typically faces a compensation process via immigration from surrounding source populations. To extend control effort to avoid this issue is in most instances impractical, both logistically and financially. Evidence-based strategy is therefore required to improve management pr...
Conference Paper
Full-text available
Invasive mammalian predators, in particular feral cat Felis silvestris catus, have largely contributed to species endangerment and extinction on islands worldwide. Control or eradication of invasive predators represent an efficient conservation tool to restore native biodiversity. Cat diet was largely studied to assess cat predation pressure and t...
Article
Full-text available
Currently, there is no general agreement about the extent to which predators’ impact prey population dynamics, as it is often poorly predicted by predation rates and species abundances. This could in part be caused by variation in the type of selective predation occurring. Notably, if predation is selective on categories of individuals that contrib...
Article
Full-text available
The disproportionate impacts of invasive predators are often attributed to the naïveté (i.e., inefficient or non-existing anti-predator behavior) of island native species having evolved without such predators. Naïveté has long been regarded as a fixed characteristic, but a few recent studies indicate a capacity for behavioral adaptation in native s...
Conference Paper
Full-text available
Alien mammal predators, in particular house cat Felis silvestris catus, have largely contributed to species endangerment and extinction on island worldwide. Generalist predatory behaviors of cats have facilitated the establishment of feral and invasive populations that have strongly threatened native wildlife. Although cat diet was well studied, ye...
Conference Paper
Full-text available
Due to its unique biodiversity and extreme endemism rates, New Caledonia archipelago is listed as one of Earth's 35 biodiversity hotspots. New Caledonian biota is now threatened by invasive species, with introduced rats considered to be particularly damaging. At the initiative of local institutions and NGOs, an innovative scientific experiment has...
Article
Full-text available
Predicting the dynamics of animal populations with different life histories requires careful understanding of demographic responses to multifaceted aspects of global changes, such as climate and trophic interactions. Continent-scale dampening of vole population cycles, keystone herbivores in many ecosystems, has been recently documented across Euro...
Article
Full-text available
Suggestions of collapse in small herbivore cycles since the 1980s have raised concerns about the loss of essential ecosystem functions. Whether such phenomena are general and result from extrinsic environmental changes or from intrinsic process stochasticity is currently unknown. Using a large compilation of time series of vole abundances, we demon...
Article
Full-text available
The eco-evolutionary dynamics of dispersal are recognised as key in determining the responses of populations to environmental changes. Here, by developing a novel modelling approach, we show that predators are likely to have evolved to emigrate more often and become more selective over their destination patch when their prey species exhibit spatio-...
Data
Spatial and temporal dimensions of prey landscapes. (A) Time-series of prey density over 100 time-steps (from one randomly chosen cell in the lattice) for three different dynamics, respectively from left to right: Stable (r = 2.0, m = 0.05), Cyclic (r = 3.0, m = 0.1), Chaotic (r = 4.0, m = 0.4). (B) Maps of prey density taken from the original latt...
Data
The evolution of a reaction norm that determines patch selection results in spatially heterogeneous costs of dispersal across a spatio-temporally complex prey landscape. The number of predators breeding in each cell at time T (B) is related to the prey density at time T (A), but by no means perfectly. However, being born in a good location does not...