Special Scientific Report--Wildlife 207-208
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However, additional field research is needed to more accurately relate changes in the survey index to changes in the population of mated doves. Specific relationships between calling doves and breeding pairs have been difficult to establish (Stone 1966).
Quality Checks of Field Data As in previous years, all 1976 survey reports were ex- amined for accuracy, completeness, and data com- parability between routes which were surveyed in both the current and preceding years. In this report, indices ...for years since 1967 have been derived from data meet- ing the standardized criteria for quality first used in 1972 (Ruos 1974).
Randomization of Call-Count Routes The original call-count survey routes, established between 1951 and 1956, were frequently selected in areas of high dove density. These were gradually replaced by more than 900 randomly selected routes between 1957 and 1970 in the 48 contiguous States.
Breeding Density Index The Breeding Density Index (BDI) is the mean num- ber of doves heard calling per route.
What to read after Special Scientific Report--Wildlife 207-208?
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:
However, additional field research is needed to more accurately relate changes in the survey index to changes in the population of mated doves. Specific relationships between calling doves and breeding pairs have been difficult to establish (Stone 1966).
Quality Checks of Field Data As in previous years, all 1976 survey reports were ex- amined for accuracy, completeness, and data com- parability between routes which were surveyed in both the current and preceding years. In this report, indices ...for years since 1967 have been derived from data meet- ing the standardized criteria for quality first used in 1972 (Ruos 1974).
Randomization of Call-Count Routes The original call-count survey routes, established between 1951 and 1956, were frequently selected in areas of high dove density. These were gradually replaced by more than 900 randomly selected routes between 1957 and 1970 in the 48 contiguous States.
Breeding Density Index The Breeding Density Index (BDI) is the mean num- ber of doves heard calling per route.
What to read after Special Scientific Report--Wildlife 207-208?
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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