«  A la découverte des milieux naturels de Midi-Pyrénées »

 

SOMMAIRE

 

I-       Introduction                                                                                                                  4

II-    Carte de localisation des sites                                                                                        6

III-  Montagne                                                                                                                     8

·  La Haute vallée d’Oo, escalier glaciaire                                                                      10

·  Les hautes altitudes, étages alpin et nival                                                                     11

·  Les quartiers de granges foraines en Bigorre                                                               12

·  Le cirque glaciaire de Cagateille                                                                                 13

·  Les massifs anciens du Haut Languedoc                                                                     14

·  L’Aubrac, plateau volcanique                                                                                     15

IV- Milieux rupestres, grottes, gorges                                                                                  16

·  Les falaises granitiques et éboulis d’altitude                                                                 18

·  La vallée du Célé, les canyons de l’Ousse et de l’Alzou                                              19

·  Les gorges de l’Aveyron et de la Vère                                                                       20

·  Les gorges de la Frau                                                                                                21

·  Le milieu souterrain, grottes d’Ariège et réseau trombe                                               22

V-    Causses et milieux méditerranéens                                                                                 24

·  Les vastes étendues herbeuses et garrigues des grandes Causses                                26

·  Les pelouses à orchidées des Causses du Quercy                                                       28

·  Les Quies calcairesde Tarascon-sur-Ariège                                                                29

VI-  Milieux aquatiques                                                                                                       30

·  La moyenne vallée de la Garonne                                                                               32

·  Les saligues du val d’Adour                                                                                       33

·  La vallée du Viaur                                                                                                      34

·  Les lacs naturels des Pyrénées                                                                                   35

·  Les lacs artificiels de Saint-Nicolas de la Grave et Puydarieux                                     36

·  Les étangs de l’Armagnac                                                                                          38

·  Les tourbières                                                                                                            39

VII-     Collines et coteaux                                                                                                     40

Les coteaux de l’Astarac                                                                                                          42

Les serres du Quercy blanc                                                                                                       43

VIII-   Forêt                                                                                                                        44

Les forêts pyrénéenes, de l’étage colinéen à l’étage alpin                                                           46

La forêt domaniale de la Grésigne                                                                                             48

Les forêts riveraines de la Garonne                                                                                            49

IX-       Les outils pour connaître, préserver et gérer                                                               50

Conseils pratiques                                                                                                                     53

Bibliographie                                                                                                                            54

Contacts, adresses utiles                                                                                                           56

Remerciements