. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. CALIFORNIA FISH AND GAME 271 Such large numbers of meat-eaters should presumably have some sort of influence upon the numbers of local game and nongame species here, and the studies which are being carried on are for the purpose of finding out whether this influence is beneficial, as some naturalists con- tend, or harmful, as a great many others have declared. Any study of animal interrelations such as this entails a vast amount of pr
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. CALIFORNIA FISH AND GAME 271 Such large numbers of meat-eaters should presumably have some sort of influence upon the numbers of local game and nongame species here, and the studies which are being carried on are for the purpose of finding out whether this influence is beneficial, as some naturalists con- tend, or harmful, as a great many others have declared. Any study of animal interrelations such as this entails a vast amount of preliminary work in order to attain a grasp of the compli- cated and often perplexing factors involved. The work began in July, 1930, with a general survey of the whole refuge, which included a detailed map of all waterways, and censuses of what were thought to be the more important food animals, namely mice, squirrels, cottontails. Fig. 77. Young avocet about ten day.'; old at the Ivos Banos ivaterfowl refug-e. This land is a regular paradise for many species of bird life. February 23, 1931. and jack rabbits. An unusually complete census of rabbits and cotton- tails was made at this time because of the necessity of destroying the ground squirrels over most of the area in compliance with county regu- lations, while at the same time it was desired that the cottontails be spared. This meant that every burrow on the entire 3000 acres had to be examined and marked with a flag—white for ground squirrels and red for cottontails. At first, sand was sifted about the entrances of all doubtful burrows, which meant that they had to be reexamined on the following day for tracks, but I found that, after practice, occupied burrows of the two species could in most cases be distinguished by the general appearance of the entrance, and in the case of the squirrel. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorat
Size: 1653px × 1512px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcaliforniadeptoffishandgame, bookauthorcaliforniafish
