. Chasse et pêche de la Californie. Pêche -- Californie ; jeu et jeu-oiseaux -- Californie ; Poissons -- Californie ; groupes de population animale ; pêches ; gibier, poissons. :IJXf'€". La figure 35. Nouveau-né avec un crotale rattle (à gauche) et la récupération de l'individu, d'un retard d'un an avec trois hochets (droite), montrant dans ce dernier, peu de croissance faites par les jeunes sans succès.. La figure 36. Crotale qui repris dans environ deux ans (31 mai 1938, à Avril 8, 1940) a plus que doublé en longueur et a gagné six hochets. Ce serpent, de trois pieds de long à l'âge de 30 mois, est probablement representativ

• Contributeur: Book Worm / Alamy Banque D'Images
• ID de l’image: RG57HH
• Taille du fichier: 7,2 MB (751,8 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 2416 x 1035 px | 40,9 x 17,5 cm | 16,1 x 6,9 inches | 150dpi

Informations supplémentaires

Cette image appartient au domaine public, ce qui signifie que le droit d’auteur a expiré ou que le titulaire du droit d’auteur a renoncé à ses droits. Les frais facturés par Alamy couvrent l’accès à la copie haute résolution de l’image.

Cette image peut avoir des imperfections car il s’agit d’une image historique ou de reportage.

. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. :iJXf'€». Figure 35. Newborn rattlesnake with one rattle (left) and recaptured, stunted individual one year old with three rattles (right), showing in the latter, slight amount of growth made by unsuccessful young.. Figure 36. Recaptured rattlesnake which in about two years (May 31, 1938, to April 8, 1940) more than doubled in length and gained six rattles. This snake, three feet long at the age of 30 months, probably is representative of successful young in its development. Significance of Number of Rattles Popular supposition lias it that the number of rattles borne by a snake indicates its age in years. Klauber (1940, pp. 29-30) has shown that a new rattle is acquired each time that a snake- sheds its skin and that several rattles may be added annually. Our own studies indicate that 3^oung snakes in their first year of growth gain, besides the original button, two to four rattles, perhaps most frequently three. Medium-sized snakes, during their second or third year, often gain two rattles annually. Adults most frequently add only one rattle a year, but sometimes gain two. Thus rattle acquisition is irregular, tending to slow down as growth decreases with attainment of adult size. Varying numbers of rattles are apt to break off during the life of a snake, so that no assumption can be made as to the total number it might have acquired unless some marking technique is used. On the areas studied newborn young rattlesnakes make their appear- ance annually in September or October, and during these months they have just the natal button which later becomes the terminal rattle. The j^oung emerging from hibernation in the spring five or six months after their birth generally still have no other rattles than the button, and the. Please note that these images are extracted from scanned page images that may have

Recherche dans la banque de photos par tags

• bookauthorcaliforniafish