Balanced (1 to 1) sex ratios are thought to evolve by a process known as frequency- dependent sel... more Balanced (1 to 1) sex ratios are thought to evolve by a process known as frequency- dependent selection of the minority sex. Five populations of a fish with genetically based variation in temperature-dependent sex determination were maintained for 5 to 6 years in artificial constant-temperature environments that initially caused the sex ratio to be highly skewed. Increases in the proportion of the minority sex occurred in subsequent generations until a balanced sex ratio was established, thus confirming a central premise underlying the theory of sex-ratio evolution.
Transactions of The American Fisheries Society, 1990
Page 1. Transactions of the American fisheries Society 119:455-462. 1990 <£> Copyright by t... more Page 1. Transactions of the American fisheries Society 119:455-462. 1990 <£> Copyright by the American Fisheries Society 1990 Spawning Season and First-Year Growth of Adult Bluefish from the New York Bight LOUIS A. CHIARELLA1 ...
Page 1. Vol. 123, No. 3 The American Naturalist March 1984 ADAPTIVE SIGNIFICANCE OF TEMPERATURE-D... more Page 1. Vol. 123, No. 3 The American Naturalist March 1984 ADAPTIVE SIGNIFICANCE OF TEMPERATURE-DEPENDENT SEX DETERMINATION IN A FISH DAVID 0. CONOVER Massachusetts Cooperative Fishery Research ...
The Atlantic sturgeon (Acipenser oxyrinchus) is currently a candidate for listing under the U.S. ... more The Atlantic sturgeon (Acipenser oxyrinchus) is currently a candidate for listing under the U.S. Endangered Species Act. While recent genetic work has focused on identifying distinct population segment (DPS) units within spawning rivers, very little work has been done to understand the relative contribution of these DPS units to sturgeon living in the near-shore marine environment in different geographic regions. Elucidating the distribution and movements of sub-adult fish is especially important because protecting this highly vagile demographic is critical in order to sustain recruitment. From 2005-2009, we collected tissue samples from ~500 sub-adults captured along the Mid-Atlantic Bight and used mitochondrial control region DNA sequences to estimate the relative contribution of different DPS units to these fish. Our objectives are to (1) delineate the natal-origins of sub-adult fish utilizing specific aggregation areas in the Mid-Atlantic Bight, (2) elucidate any seasonal patter...
Transactions of The American Fisheries Society, 1998
Field observations of a variety of fish species at different latitudes suggest that there is an i... more Field observations of a variety of fish species at different latitudes suggest that there is an inverse (countergradient) relationship between growth rate within the first growing season and the length of the growing season. In this study, larvae of striped bass Morone saxatilis from four different latitudes—Hudson River, New York (NY) (41°N); Nanticoke and Patuxent rivers, Maryland (MD) (38°N); Santee–Cooper
Balanced (1 to 1) sex ratios are thought to evolve by a process known as frequency- dependent sel... more Balanced (1 to 1) sex ratios are thought to evolve by a process known as frequency- dependent selection of the minority sex. Five populations of a fish with genetically based variation in temperature-dependent sex determination were maintained for 5 to 6 years in artificial constant-temperature environments that initially caused the sex ratio to be highly skewed. Increases in the proportion of the minority sex occurred in subsequent generations until a balanced sex ratio was established, thus confirming a central premise underlying the theory of sex-ratio evolution.
Transactions of The American Fisheries Society, 1990
Page 1. Transactions of the American fisheries Society 119:455-462. 1990 <£> Copyright by t... more Page 1. Transactions of the American fisheries Society 119:455-462. 1990 <£> Copyright by the American Fisheries Society 1990 Spawning Season and First-Year Growth of Adult Bluefish from the New York Bight LOUIS A. CHIARELLA1 ...
Page 1. Vol. 123, No. 3 The American Naturalist March 1984 ADAPTIVE SIGNIFICANCE OF TEMPERATURE-D... more Page 1. Vol. 123, No. 3 The American Naturalist March 1984 ADAPTIVE SIGNIFICANCE OF TEMPERATURE-DEPENDENT SEX DETERMINATION IN A FISH DAVID 0. CONOVER Massachusetts Cooperative Fishery Research ...
The Atlantic sturgeon (Acipenser oxyrinchus) is currently a candidate for listing under the U.S. ... more The Atlantic sturgeon (Acipenser oxyrinchus) is currently a candidate for listing under the U.S. Endangered Species Act. While recent genetic work has focused on identifying distinct population segment (DPS) units within spawning rivers, very little work has been done to understand the relative contribution of these DPS units to sturgeon living in the near-shore marine environment in different geographic regions. Elucidating the distribution and movements of sub-adult fish is especially important because protecting this highly vagile demographic is critical in order to sustain recruitment. From 2005-2009, we collected tissue samples from ~500 sub-adults captured along the Mid-Atlantic Bight and used mitochondrial control region DNA sequences to estimate the relative contribution of different DPS units to these fish. Our objectives are to (1) delineate the natal-origins of sub-adult fish utilizing specific aggregation areas in the Mid-Atlantic Bight, (2) elucidate any seasonal patter...
Transactions of The American Fisheries Society, 1998
Field observations of a variety of fish species at different latitudes suggest that there is an i... more Field observations of a variety of fish species at different latitudes suggest that there is an inverse (countergradient) relationship between growth rate within the first growing season and the length of the growing season. In this study, larvae of striped bass Morone saxatilis from four different latitudes—Hudson River, New York (NY) (41°N); Nanticoke and Patuxent rivers, Maryland (MD) (38°N); Santee–Cooper
Uploads
Papers by David Conover