Special Scientific Report--Wildlife 109
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Nesting success Nesting success for this species is ex- tremely variable and in certain years is known to be quite low. Sprunt (1949) reported on the fate of 10 nests under observation on Lake Okeechobee in 1938. Each nest originally con- tained three eggs. In each of four nests only one egg hatched; in each of three nests two eggs hatched; in each of two nests all three eggs hatched; and in one nest no eggs hatched.
Out of 30 eggs, 14 were infertile or failed to hatch for some unknown reason. ...Sprunt pointed out that 1938 was a year of low success, but that hatching success improved in 1939 and 1940. Wachenfeld (1956) summarized the fate of six active nests found on Lake Okee- chobee in 1956. Two were destroyed by un- known causes; two were lost to predators (one to boattailed grackles and one presumably to a water moccasin); and the other two were tilted when water levels dropped and the reeds supporting the nests separated. In one of the tilted nests, one of three eggs hatched but the young drowned when the nest fell apart.
What to read after Special Scientific Report--Wildlife 109?
You can find similar books in the "Read Also" column, or choose other free books by U.S. Fish And Wildlife Service to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Nesting success Nesting success for this species is ex- tremely variable and in certain years is known to be quite low. Sprunt (1949) reported on the fate of 10 nests under observation on Lake Okeechobee in 1938. Each nest originally con- tained three eggs. In each of four nests only one egg hatched; in each of three nests two eggs hatched; in each of two nests all three eggs hatched; and in one nest no eggs hatched.
Out of 30 eggs, 14 were infertile or failed to hatch for some unknown reason. ...Sprunt pointed out that 1938 was a year of low success, but that hatching success improved in 1939 and 1940. Wachenfeld (1956) summarized the fate of six active nests found on Lake Okee- chobee in 1956. Two were destroyed by un- known causes; two were lost to predators (one to boattailed grackles and one presumably to a water moccasin); and the other two were tilted when water levels dropped and the reeds supporting the nests separated. In one of the tilted nests, one of three eggs hatched but the young drowned when the nest fell apart.
What to read after Special Scientific Report--Wildlife 109?
You can find similar books in the "Read Also" column, or choose other free books by U.S. Fish And Wildlife Service to read onlineMoreLess
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