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931 results on '"WHITE, GARY C."'

2. Spotted owls and forest fire: Comment

Author

Jones, Gavin M, Gutiérrez, RJ, Block, William M, Carlson, Peter C, Comfort, Emily J, Cushman, Samuel A, Davis, Raymond J, Eyes, Stephanie A, Franklin, Alan B, Ganey, Joseph L, Hedwall, Shaula, Keane, John J, Kelsey, Rodd, Lesmeister, Damon B, North, Malcolm P, Roberts, Susan L, Rockweit, Jeremy T, Sanderlin, Jamie S, Sawyer, Sarah C, Solvesky, Ben, Tempel, Douglas J, Wan, Ho Yi, Westerling, A LeRoy, White, Gary C, and Peery, M Zachariah

Subjects
Ecological Applications, Ecology, Zoology
Published
2020

3. Discrimination among similarly colored goose species in federal harvest surveys.

Author

Dooley, Joshua L., Doherty, Paul F., Otis, David L., White, Gary C., Taylor, Daniel R., Griffin, Doreen L., Chandler, Stephen C., Catino, Stephanie M., Fleming, Kathy K., Raftovich, Robert V., and Piaggio, Antoinette J.

Subjects
GEESE, MIGRATORY birds, NUMBERS of species, SNOW goose, SPECIES
Abstract

Each year in the United States, fall‐winter (sport) harvests of goose species are estimated from federal surveys coordinated by the United States Fish and Wildlife Service, including the Migratory Bird Harvest Survey to estimate total goose harvest and the Parts Collection Survey (PCS) to estimate the species and age composition. For the PCS, randomly selected hunters collect tail and wing feathers of each goose shot during the hunting season, and then biologists determine the age class and species of each sample at organized events (Wingbees) in each of the 4 flyways (Pacific, Central, Mississippi, and Atlantic). For similarly colored goose species, cackling (Branta hutchinsii) versus Canada (B. canadensis) geese (dark geese) and Ross's (Anser rossii) versus snow (A. caerulescens) geese (light geese), different protocols evolved among Wingbees to differentiate samples into groupings of management interest, leading to difficulties in estimating species‐level harvests among the 4 flyways or nationally. We conducted a study among the United States flyways during 2019–2022 to derive thresholds of central tail feather length to discriminate between dark geese and between light geese. We compared morphological‐ and genetic‐based approaches. There was support for 2 distinct mitochondrial DNA (mtDNA) clades in dark and light geese, but only dark goose clades corresponded with central tail feather lengths (morphological size and species identification). Derived thresholds for central tail feather lengths of dark geese in the 3 westernmost flyways using genetic‐based species' discrimination were 145 mm for adults and 134 mm for juveniles, approximately 13 mm and 9 mm less, respectively, than thresholds using morphological‐based species' discrimination. There was limited ability to discriminate light geese based on either mtDNA or central tail feather lengths. We suggest managers use our derived thresholds based on genetic‐based species' discrimination to classify dark goose PCS samples. More advanced genome analyses should be conducted before changing current Wingbee protocols for light geese. Lastly, we encourage more studies to incorporate genetic analyses to complement morphological discrimination. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Assessing entrainment of larval fish in the Hogback Diversion Canal, San Juan River.

Author

Clark Barkalow, Stephani L., Dudley, Robert K., Platania, Steven P., Brandenburg, W. Howard, McKinstry, Mark C., and White, Gary C.

Subjects
WATER diversion, FISH stocking, CANALS, WALL design & construction, FISH larvae, WEIRS, HATCHERY fishes, IRRIGATION
Abstract

Water diversions worldwide may entrain or impinge fish and have population‐level impacts, but barriers like fish screens can reduce such threats. Traditional barriers are ineffective in the San Juan River, USA, due to high sediment and debris loads, so the Hogback Diversion Canal, NM, employs a novel weir wall design to reduce entrainment of sub‐adult and adult fishes. We evaluated the effectiveness of the weir wall in reducing the entrainment of larval fish using a combination of experimental and overnight trials. Larval fish densities were compared between the irrigation canal that delivers water to irrigators and subsequently entrains fish and the bypass canal that conveys water and fish back to the river. The density of hatchery‐produced larval fish collected in the irrigation canal during the experimental trial (0.74 fish/m3) was 52% of their density in the bypass canal (1.43 fish/m3), suggesting entrainment reduction. The density of wild‐produced larvae during overnight trials indicated some minor, mostly nonsignificant, differences between catch rates in irrigation and bypass canals, ontogenetic phases, and sampling dates. Though entrainment rates of wild‐produced larvae were not significantly reduced, density differences among postflexion mesolarvae and metalarvae suggest possible entrainment reduction of more developed ontogenetic phases. More intensive research is necessary to better elucidate the efficacy of the novel weir wall for reducing the entrainment of larval fish. However, our larval fish results and the results from prior large‐bodied entrainment studies suggest the novel weir wall may reduce fish entrainment in water diversions and benefit fluvial ecosystems in which traditional screens are unfeasible. [ABSTRACT FROM AUTHOR]

Published
2024
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22. Status and Trends in Demography of Northern Spotted Owls, 1985-2003

Author

Anthony, Robert G., Forsman, Eric D., Franklin, Alan B., Anderson, David R., Burnham, Kenneth P., White, Gary C., Schwarz, Carl J., Nichols, James D., Hines, James E., Olson, Gail S., Ackers, Steven H., Andrews, Lawrence S., Biswell, Brian L., Carlson, Peter C., Diller, Lowell V., Dugger, Katie M., Fehring, Katherine E., Fleming, Tracy L., Gerhardt, Richard P., Gremel, Scott A., Gutiérrez, R. J., Happe, Patti J., Herter, Dale R., Higley, J. Mark, Horn, Robert B., Irwin, Larry L., Loschl, Peter J., Reid, Janice A., and Sovern, Stan G.

Published
2006

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