The Bullfrog in Sologne from battle to eradication - Eric Bairrão Ruivo Science and Conservation D irector at Beauval Zoo Beauval Nature ...

 
CONTINUER À LIRE
The Bullfrog in Sologne from battle to eradication - Eric Bairrão Ruivo Science and Conservation D irector at Beauval Zoo Beauval Nature ...
The Bullfrog in Sologne
from battle to eradication

Eric Bairrão Ruivo
Science and Conservation D irector at Beauval Zoo
Beauval Nature Conservation Director

EAZA Conservation Forum – Leipig – May2014
The Bullfrog in Sologne from battle to eradication - Eric Bairrão Ruivo Science and Conservation D irector at Beauval Zoo Beauval Nature ...
Beauval Nature

  29 conservation programs in 2014
The Bullfrog in Sologne from battle to eradication - Eric Bairrão Ruivo Science and Conservation D irector at Beauval Zoo Beauval Nature ...
AMPHIBIAN CRISIS : A NATIONAL AND WORLD PROBLEM

 Environments Fragmentation
 => road network and traffic

                          Pond disappearance
                          => urbanisation, drying out, farmlands …

    Diseases
    => mushroom (Chytridiomycosis), virus
    (ranavirus), bacteria…

     Invasive exotic species
     => Bull frog

BULL FROG – ONE OF 100 WORST INVASIVE EXOTIC SPECIES (IUCN)
The Bullfrog in Sologne from battle to eradication - Eric Bairrão Ruivo Science and Conservation D irector at Beauval Zoo Beauval Nature ...
AMPHIBIAN CRISIS : A NATIONAL AND WORLD PROBLEM

Dr Francesco FICETOLA - Université de Milan

                                              Relation between
                                              Bullfrog and climate

Climate matching
The Bullfrog in Sologne from battle to eradication - Eric Bairrão Ruivo Science and Conservation D irector at Beauval Zoo Beauval Nature ...
AMPHIBIAN CRISIS : A NATIONAL AND WORLD PROBLEM

   Sologne is a territory
   of great interest for
   Europe
The Bullfrog in Sologne from battle to eradication - Eric Bairrão Ruivo Science and Conservation D irector at Beauval Zoo Beauval Nature ...
BULL FROG BIOLOGY AND IMPACT
The Bullfrog in Sologne from battle to eradication - Eric Bairrão Ruivo Science and Conservation D irector at Beauval Zoo Beauval Nature ...
BULL FROG BIOLOGY AND IMPACT
The Bullfrog in Sologne from battle to eradication - Eric Bairrão Ruivo Science and Conservation D irector at Beauval Zoo Beauval Nature ...
BULL FROG BIOLOGY AND IMPACT
The Bullfrog in Sologne from battle to eradication - Eric Bairrão Ruivo Science and Conservation D irector at Beauval Zoo Beauval Nature ...
BULL FROG BIOLOGY AND IMPACT
        EGG CLUTCHES
• 25 000 eggs on average (up
to 40 000)
•1 meter wide
•Hatching in a few days

                               1 to 2 years
The Bullfrog in Sologne from battle to eradication - Eric Bairrão Ruivo Science and Conservation D irector at Beauval Zoo Beauval Nature ...
BULL FROG BIOLOGY AND IMPACT
Healthy carrier of the worst disease affecting Amphibians
Batrachochytrium dendrobatidis (pathogenic mushroom)

Vastand diverse diet, creating an imbalance on the ecosystem
HISTORY AND ACTIONS
Autumn 2002 : discovery of the Bullfrog in Sologne

2003 : Survey on 7000 ha

2004 - 2008 : Study of fighting measures
         - testing the actions to be implemented (shooting, explosives, rotenone,
prospection and destruction of egg clutches…),

2009 - 2013 : Eradication program
          - selection of the best actions (shooting, prospection of egg clutches,
classical observation, fishing, trapping barriers),
          - survey on 36 000 ha
          - Implementation of new detection methods: environmental DNA
          - Information exchange, publications, participation in international meetings,
training,« of staff and local authorities…
HISTORY AND ACTIONS
Shooting
• Nocturnal
•Use od powerful lamps with
battery
• Verification with binoculars
• 2 pers / team
• 22h     5h                                       Sylvain Richier

• Adults and juveniles                                      …2007

               Many volunteers, always under the
               supervision of an expert, and
               authorised by local authorities
               (Arrêté préfectoral)
HISTORY AND ACTIONS
Environmental watching
For the smaller sites (less of 400
m of banks) night prospections
with binoculars and portable
lamps.

For the bigger sites (with more
than 400 m of banks: detection
through environmental DNA in
the water.
HISTORY AND ACTIONS
FISHING
Allows the destruction of
tadpoles before the
metamorphosis
The pond is emptied and
then fished
HISTORY AND ACTIONS
EGG CLUTCHES PROSPECTION
Allows to eliminate egg
clutches
Avoids the presence of
tadpoles
Done every 4 days by a team of
two persons, before hatching
HISTORY AND ACTIONS
TRAPPING BARRIERS
Avoids bullfrog dispersal

To set up when shooting
is no longer sufficient to
eliminate all the
individuals.
                                             1m

Needs a daily surveillance
of the capture traps

Very good return but
                                          0.5 m
needs a lot of time
RESULTS 2005-2013

Egg clutches prospection

                                        10   3
RESULTS 2005-2013

Shooting

                               …2007

                               461

                               198
RESULTS 2005-2013
Evolution of the indication of abundance of the adults by colonized site

                                                                   …2007

                Less than 3 adults by pond
EVOLUTION OF THE DETECTION METHODS
                           Survey in 7.000 ha              Survey in 36.000 ha

                                                                        Environmental DNA
Sites nouveaux colonisés

                                                                                            …2007

                                     Evolution of the number of new colonized ponds

                                       Evolution of the detection methods and tools
RESULTS 2005-2013
WORKS COLLECTIVES, COLLOQUIUMS, TRAININGS
Local and international sensitization

                                            Conférence à hersbruck en 2012

-SÉMINAIRE "GESTION DES ESPÈCES INVASIVES
EN MILIEUX AQUATIQUES« Paris 2010

- Journées d’échanges «Espèces Exotiques
Envahissantes» Tours 2013
                                                  Associations de
                                                  protection de la nature,
                                                  Police de
                                                  l’environnement,
                                                  Ministère de
                                                  l’environnement…
Têtards                 Juvéniles                             Adultes                                Pontes                              ?
                                                         Moins             Plusieurs
                      Plusieurs          Quelques
                     centaines           dizaines        d’une             dizaines
                     d’individus        d’individus     dizaine           d’individus
                                                      d’individus

                                                                                                                                  environnementale
                                                                                                                Prospections de
et pêche
Vidange

                                                                                                                    pontes

                                                                                                                                        Veille
                     de piégeage

                                                                   Tirs
                      Barrière

                                                      Nocturne, de 1 à plus de dix passages
Pose de grilles de
   protection.                                            par équipes de 2 personnes
   Surveillance
   vidange sur
 plusieurs jours,        Baisse du
                                                                                                                                      Veille
 semaines, mois.       niveau d’eau
                      et surveillance             Repartition du temps / actions                                                    classique
                         du niveau                                                                                                 sur les sites
                           d’eau                                                                                                    de petites
                                                                13        7      7                                Diurne, 2          surfaces
                                                                                                                   fois par
                                                                                                                 semaines,
                         Pose de la                                                                             au moins 20
Equipe de pêche et        barrière,                     32                                                        passages
  traitement des        relevés des
                         pots puis
                                                                              41                                par équipes
                                                                                                                     de 2
                                                                                                                                       ADNe
     poissons                                                                                                                      Sur les sites
                       dépose de la                                                                              personnes         de grandes
                          barrière                                                                                                  surfaces

                                                      Source : Comité Départemental de la Protection de la Nature et de l’Environnement, 2014
ET APRÈS

Agir sur tous les secteurs colonisés par la Grenouille
taureau en France.

En 2015 lancement d’un programme d’éradication
des amphibiens exotiques envahissants en France.
Ce programme concerne la Grenouille taureau et le
Xénope lisse
Plusieurs acteurs seront mobilisés selon les
territoires concernés.

Etudier l’influence de la présence de ces espèces sur
la tendance des populations d’espèces autochtones
et d’un point de vue général l’état des écosystèmes
envahis :
 Connaître et quantifier les espèces impactées par
ces EEE
 Étudier les parasites, maladies, etc.
 Étudier les risques pour la biodiversité.
ACKNOWLEDGEMENTS

Pays de Grande Sologne

              Région Centre

              Direction Régionale de
              l’Environnement

              l’Office National de
              la Chasse et de la
              Faune Sauvage de
              Loir-et-Cher

 Syndicat d’Entretien du Bassin du Beuvron
 Comité Départemental de Protection de la Nature et de l’Environnement
 ZooParc de Beauval and Beauval Nature

 And all the volunteers
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