Sunday, July 19, 2009

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The frog breeding fields in the large bogs Marchiennes

Here is a statement of our colleague herpetologist William Lemoine, in charge of missions ENS General Council of the North:

The moor frog, Rana arvalis, a species unique to the French fauna encountered mainly in the Northern Department. Caby and its discovery by Constantin de Magny (Caby & Constantin de Magny, 1999) in the bog Vred was in 1999. A second observation of the species was reported the same year at the Great Bog Marchiennes located about 3 kilometers from the bog by Lucien Vred Kerautret.
Bog alkaline Marchiennes, also located in the territory of the regional Natural Scarpe-Escaut, form a set of nearly 50 acres, much of which is subject to regular surveys to characterize the state of the population and Ecology fields of the frog. The first inventories pushed
were made by Rondel & Scrève (2003). The authors were able to observe the presence of spawning and photograph a amplexus. Rondel Scrève and were the first to provide evidence of its reproduction in this sector. Since then, annual surveys are conducted jointly by the Northern Department (owner of part of the site under its policy of sensitive natural areas (SLA) and the Regional Natural Park Ornithological Group and naturalist Nord-Pas de Calais (GON) to confirm this initial observation and to locate areas issues with respect to this species. Beginning in April 2009 (02.04.2009) new bridges were located by Julien Leroy, county custody, charged with monitoring this species in this area. Observation and photography just after metamorphosis froglets confirmed breeding of this species Marchiennes exceptional.

Bibliography:
Caby, B. & Constantin de Magny, G. 1999 - Status of Amphibians and Reptiles Nature Reserve Volunteer of the Great Bog Vred (North). Memory internship Masters of Population Biology and Ecosystems. Natural Area Regional Natural Park Scarpe-Escaut and Sciences University et Technologies de Lille. 24 p + annexes.
RONDEL, S. & Scrève, F., 2003 - inventory, mapping and analysis of amphibian populations on the Great Bog Marchiennes and its surroundings. Memory internship Masters of Population Biology and Ecosystems. General Council of the North University of Science and Technology of Lille. 86 p.

Imago Rana arvalis Marchiennes discovered in 2009, photo © William Lemoine (click image):

Saturday, July 11, 2009

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Conservancy's viper Orsini

Conservation Commission of HFS was alerted by Jean- Pierre Baron, specialist Orsini's viper, about a sporting event which will take cyclist on July 20 on one of the sites of occurrence of species in the Vaucluse. The event in question needs to attract several thousand spectators, and the presence of so many people on the site could have significant impacts on the population of Orsini's viper. Thus, the SHF has requested the local authority to take into account the presence of this protected species and threatened, and recommended the establishment of actions to ensure the protection of snakes during the course of the race. More information later !