Julien Renet

Julien Renet
self-employed

About

38
Publications
15,065
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
93
Citations
Introduction
I'm a conservation biologist self-employed after having worked for more than 16 years at the NGO Conservatoire d’espaces naturels de Provence Alpes Côte d’Azur. I designs, coordinates, and implements the conservation programs for several species of herpetofauna of the Provence-Alps-Côte d’Azur region in France. My work concerns the general framework of conservation biology, more specifically ecology, biogeography, population dynamics, and assessments of individual marking methods.

Publications

Publications (38)
Article
Full-text available
The knowledge of a species’ spatial ecology is essential for its conservation as it helps to implement targeted protection measures to suitable habitats. In 2011 and 2013, two French populations of ocellated lizards Timon lepidus were monitored through very high frequency (VHF) radio telemetry in two distinct Mediterranean habitats: a 77 ha scrubla...
Article
Full-text available
The exact function and possible toxicity of most components of snake venoms have not been fully elucidated. Clinically, the identification of potentially toxic components does not automatically translate into a human health issue. Not all venomous snakes are equal in terms of health risk. For instance, several vipers have little medical significanc...
Preprint
Full-text available
Photo-identification is a non-invasive method used for recognising wild animals with distinctive and stable patterns over time. This method is now widely used for capture-recapture wildlife monitoring. However, in species exhibiting rapid colouration changes, the evolving body patterns can lead to errors in individual recognition. In this study, we...
Article
Full-text available
Capture-mark-recapture studies that track individual amphibians are important for conservation, population dynamics, and ecological studies. One of the most widely used methods in wildlife marking is tagging with Passive Integrated Transponders (PIT). Tagging can adversely affect amphibians, however, and tag loss can affect the estimation of the de...
Article
Full-text available
In vertebrates, the main tissue devoted to energy storage is the adipose tissue. In salamanders, energy reserves can also be stored in the adipose tissues of the tail. Therefore, we evaluated if energy storage in salamanders' tails is related to individual body condition, life cycle and environmental constraints. We calculated a scaled measure of t...
Article
Full-text available
Introductions of animals and plants by humans permanently restructure the distribution ranges of species and the compositions of communities, a phenomenon which has been intensified in recent decades with globalization. However, it is often difficult to date these introductions or to identify the geographic origin of the introduced individuals. In...
Article
Full-text available
Context : In recent years, multiple computer algorithms, which allow us to perform photographic capture-recapture analysis, have been developed. Their massive application, also in wildlife demographic and ecological studies, is largely due to the fact that these tools are non-invasive and non-expensive. To maximise the performance of these program...
Presentation
Full-text available
We investigated the scientific literature in order to analysis and synthesis of existing knowledge of the relationships between Trachemys species and native freshwater turtles. This review should allow provide objective information to guide future conservation actions and strategic choices of environmental organizations.
Article
Full-text available
The estimation of demographic parameters in wild populations is strengthened by individual identification. For amphibians, various techniques are used to either temporarily or permanently mark individuals for identification. Photo-identification of body patterns offers a non-invasive technique. However, the reliability of photo-recognition software...
Article
Full-text available
The lower Rhône valley constitutes the southern limit of the great crested newt’s (Triturus cristatus) global distribution range. The initial objectives of this study were to confirm historical presence data, to identify potential new great crested newt populations and to characterise their habitats (with a Habitat Suitability Index) in order to as...
Article
Full-text available
The genus Anguis is known to be mainly continental in the Mediterranean area, and accordingly it has never been recorded in Western Mediterranean islands. Here we report for the first time the presence of the slow worm in a Western Mediterranean island, the Ile Sainte-Marguerite from Lérins archipelago (southeastern France). The molecular analysis...
Article
Full-text available
Are elevated sites’ occurrences of Ocellated lizard Timon lepidus (Daudin, 1802) sporadic events? A case study in the southeastern French Alps Species distribution knowledge is a major issue for conservation, especially in times drive by global changes. However, common assumptions and non-standardized distribution of sample or data set often resul...
Poster
Full-text available
A synthesis of monitoring and studies implemented (achieved or on going) in the Crau national nature reserve : diet, population trends, telemetry, population restoration, time budget and cavities typology.
Article
Full-text available
Distribution of the European pond turtle Emys orbicularis (Linnaeus, 1758) in Lower Durance: assessment after four years of prospecting (2013-2016). A study on the distribution of the European pond turtle in Lower Durance was carried out between 2013 and 2016. The previously identified favorable aquatic habitats were sampled using several detection...
Article
Full-text available
Current conservation assessments and actions are often based upon anecdote or expert knowledge rather than upon evidence resulting from ecological data analysis. Expert knowledge could alert about a decline or a threat but have to be confronted with standardized data collection. The Crau steppe is believed to host one of the largest populations of...
Article
Full-text available
Artificial burrows supplementation for reptiles population restoration: feedback from the ocellated lizard Timon lepidus (Daudin, 1802) in the Crau steppe. Artificial burrows are widely used for the survey or conservation of reptile populations. Nevertheless, few ecological restoration programs include such management practices into the global proj...
Article
Full-text available
Discovery and first characterization of a population of European pond turtle Emys orbicularis (Linnaeus, 1758) at the Pourra’s pond (Bouches-du-Rhône French department). Capture campains conducted in spring 2014 allowed us to discover a population of European pond turtle Emys orbicularis (Linnaeus, 1758) at the Pourra’s pond. Its origin is yet unkn...
Research
Full-text available
En complément de la Stratégie conservatoire régionale du Spélerpès de Strinati, ce guide technique est à destination des professionnels de l'environnement (parc nationaux, réserves naturelles, Office national des forêts, Office national de la chasse et de la faune sauvage, associations etc.), des institutions publiques (mairies, collectivités terri...
Technical Report
Full-text available
Le Spélerpès de Strinati est un urodèle endémique de l’extrême sud-est de la France, de la Ligurie et du nord des Apennins. La répartition des populations autochtones concerne en France les départements des Alpes-Maritimes et des Alpes-de-Haute-Provence. Cet amphibien localisé et discret, représente un fort en- jeu patrimonial au niveau national. I...
Article
Full-text available
The diet of Ocellated Lizard, a reptile considered as vulnerable in Europe, was studied in a protected area containing one of the most important French populations of the species. It aims to describe diet composition and its temporal variation but also to identify differences between age classes. A sample of 221 scats was collected from May to Sept...
Article
Full-text available
Deux cas de bifurcation caudale sont rapportés chez le Lézard ocellé Timon lepidus lepidus (Daudin, 1802) dans la plaine de la Crau (Bouches-du-Rhône). Two cases of bifurcated tail are reported in the Ocellated Lizard Timon lepidus lepidus in the Crau plain (Bouches-du-Rhône).
Article
Full-text available
European leaf-toed gecko Euleptes europaea (Gené, 1839) (Reptilia, Squamata, Sphaerodactylidae) – What future for French mainland populations? the european leaf-toed gecko Euleptes europaea is a Western Mediterranean endemic, mainly located on the tyrrhenian islands. in the far south-eastern France, eighteen mainland locations were discovered du...
Article
Full-text available
Summary – The French cave salamander, Speleomantes strinatii (Aellen, 1958) (Amphibia, Urodela, Plethodontidae): Distribution range of native populations in France and Monaco. Col- lection and pooling of data for 382 records of French cave salamanders Speleomantes strinatii Aellen, 1958 (data gathered by Cen PACA, PnM, MHnn, CdS06) have provided...
Article
Full-text available
RESUME La radio-télémétrie est une technique utilisée pour étudier le comportement et les rythmes d'activités des animaux. Il est nécessaire d'utiliser des systèmes ayant le moins d'impact possible sur le comportement des individus équipés sous peine de biais dans les données récoltées. Nous avons testé l'effet d'un système de harnais en élastoplas...
Article
Full-text available
CNRS, 1919 route de Mende, 34293 Montpellier cedex 5 laurent.tatin@cen-paca.org RESUME L'estimation de l'abondance des populations est une étape fondamentale pour mettre en place des mesures de conservation adaptées, permettant parfois de mettre en évidence l'origine des changements observés. Les méthodes dites de Capture-Marquage-Recapture (CMR) s...
Article
Full-text available
julien.renet@cen-paca.org, laurent.tatin@cen-paca.org RESUME L'étude du régime alimentaire du Lézard ocellé dans la Réserve Naturelle Nationale des Coussouls de Crau (Bouches-du-Rhône, France) a révélé la présence dans les feces, de fragments d'insectes remarquables. Il s'agit de Coléoptères considérés comme ayant une valeur patrimoniale : Sphenopt...
Article
Full-text available
Great Crested Newt Triturus cristatus Laurenti, 1768 (Caudata : Salamandridae) in Provence-Alpes-Côte d'Azur : threats and stakes on the unique known population. The range of the Great Crested Newt Triturus cristatus finds its southern margin in the Mediterranean Basin where only isolated populations can be found. The only population in the region...
Article
Full-text available
La recherche spécifique d’une espèce permet parfois de préciser la répartition d’autres espèces occupant des biotopes similaires. Lors de prospections ayant pour but de mieux définir la répartition des populations du Phyllodactyle d’Europe Euleptes europaea dans le département des Alpes-Maritimes, 2 nouvelles stations continentales d’Hémidactyle ve...
Article
Full-text available
En vue d’améliorer les connaissances sur la répartition continentale du Phyllodactyle d’Europe Euleptes europaea Gené, 1839, une campagne de prospection a été réalisée dans le département des Alpes-Maritimes sur une période de 2 ans (2005-2006). La découverte effective de 11 nouvelles stations apporte de nouveaux éléments relatifs aux caractéristiq...

Questions

Question (1)
Question
Since 4 years, our association studies the demography of a European pond turtle population (Emys orbicularis), located on a wet area (about 7 ha) in southeastern France. This population is totally isolated. There is no road nearby, not limiting (apparent) factors that may cause high adult mortality. Laying areas are located near water areas in relatively well preserved terrestrial habitats. However, a significant reduction of the water surface is observed.
We found a growing imbalance in sex ratio, a very low survival and a large decline in the number of breeding males over time.
Do you know of a similar case?

Projects

Projects (3)
Project
We will examine the scientific literature in order to analysis and synthesis of existing knowledge of the relationships between Trachemys species and native freshwater turtles. This review should allow provide objective information to guide future conservation actions and strategic choices of environmental organizations.
Project
A three year study in southeast France aims to compare demographic parameters of two Pelobates cultripes populations
Project
We collected 196 000 pictures from 204 camera trap.days (19 adult lizards) this spring that we want to analyse during winter. The objective of the study is to identify the time spent by adult lizard basking on stone piles, so that their availability for observer during the day (7h-21h). It will improve our monitoring by allowing the right effort (line distance sampling) at the best time of the day( regarding weather condition AND activity pattern). If anyone has a feedback on such amount of data (pictures) management and analysis, let me know your advices...