Thomas Custer (Former Employee)
Science and Products
Filter Total Items: 166
Trace elements and organochlorines in the shoalgrass community of the lower Laguna Madre Texas Trace elements and organochlorines in the shoalgrass community of the lower Laguna Madre Texas
Our objectives were to measure concentrations of seven trace elements and 14 organochlorine compounds in sediment and biota of the shoalgrass (Halodule wrightii) community of the lower Laguna Madre of south Texas and to determine whether chemicals associated with agriculture (e.g. mercury, arsenic, selenium, organochlorine pesticides) were highest near agricultural drainages. Arsenic...
Authors
T. W. Custer, C. A. Mitchell
Feeding flights of breeding double-crested cormorants at two Wisconsin colonies Feeding flights of breeding double-crested cormorants at two Wisconsin colonies
Unmarked Double-crested Cormorants (Phalacrocorax auritus) (n = 523) were followed by airplane from Cat Island and Spider Island, two nesting colonies in Wisconsin, to their first landing site. Cormorants flew an average of 2.0 km from Cat Island (maximum 40 km) and 2.4 km from Spider Island (maximum12 km). The mean direction of landing sites differed seasonally for fights from Spider...
Authors
T. W. Custer, C. Bunck
Feeding flights of breeding double-crested cormorants at two Wisconsin colonies Feeding flights of breeding double-crested cormorants at two Wisconsin colonies
Unmarked Double-crested Cormorants (Phalacrocorax auritus ) were followed by airplane from Cat Island and Spider Island, two nesting colonies in Wisconsin, to their first landing site. Cormorants flew an average of 2.0 km from Cat Island (maximum 40 km) and 2.4 km from Spider Island (maximum 12 km). The mean direction of landing sites differed seasonally for flights from Spider Island...
Authors
T. W. Custer, C. Bunck
Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets
Floatation of eggs in water and specific gravity of eggs of Black-crowned Night-Herons (Nycticorax nycticorax ), Snowy Egrets (Egretta thula ) and Great Egrets (Casmerodius albus ) were evaluated as methods to determine date of hatching. Although specific gravity was a better predictor of hatching date than egg flotation, both techniques were imprecise. The regression between specific...
Authors
T. W. Custer, G.W. Pendleton, R.W. Roach
Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets
Flotation of eggs in water and specific gravity of eggs of Black-crowned Night-Herons (Nycticorax nycticorax), Snowy Egrets (Egretta thula) and Great Egrets (Casmerodius albus) were evaluated as methods to determine date of hatching. Length of incubation and duration of hatching period were also documented for each species. Although species gravity was a better predictor of hatching date...
Authors
T. W. Custer, G.W. Pendleton, R.W. Roach
Redhead duck behavior on lower Laguna Madre and adjacent ponds of southern Texas Redhead duck behavior on lower Laguna Madre and adjacent ponds of southern Texas
Behavior of redheads (Aythya americana) during winter was studied on the hypersaline lower Laguna Madre and adjacent freshwater to brackish water ponds of southern Texas. On Laguna Madre, feeding (46%) and sleeping (37%) were the most common behaviors. Redheads fed more during early morning (64%) than during the rest of the day (40%); feeding activity was negatively correlated with...
Authors
C. A. Mitchell, T. W. Custer, P.J. Zwank
Science and Products
Filter Total Items: 166
Trace elements and organochlorines in the shoalgrass community of the lower Laguna Madre Texas Trace elements and organochlorines in the shoalgrass community of the lower Laguna Madre Texas
Our objectives were to measure concentrations of seven trace elements and 14 organochlorine compounds in sediment and biota of the shoalgrass (Halodule wrightii) community of the lower Laguna Madre of south Texas and to determine whether chemicals associated with agriculture (e.g. mercury, arsenic, selenium, organochlorine pesticides) were highest near agricultural drainages. Arsenic...
Authors
T. W. Custer, C. A. Mitchell
Feeding flights of breeding double-crested cormorants at two Wisconsin colonies Feeding flights of breeding double-crested cormorants at two Wisconsin colonies
Unmarked Double-crested Cormorants (Phalacrocorax auritus) (n = 523) were followed by airplane from Cat Island and Spider Island, two nesting colonies in Wisconsin, to their first landing site. Cormorants flew an average of 2.0 km from Cat Island (maximum 40 km) and 2.4 km from Spider Island (maximum12 km). The mean direction of landing sites differed seasonally for fights from Spider...
Authors
T. W. Custer, C. Bunck
Feeding flights of breeding double-crested cormorants at two Wisconsin colonies Feeding flights of breeding double-crested cormorants at two Wisconsin colonies
Unmarked Double-crested Cormorants (Phalacrocorax auritus ) were followed by airplane from Cat Island and Spider Island, two nesting colonies in Wisconsin, to their first landing site. Cormorants flew an average of 2.0 km from Cat Island (maximum 40 km) and 2.4 km from Spider Island (maximum 12 km). The mean direction of landing sites differed seasonally for flights from Spider Island...
Authors
T. W. Custer, C. Bunck
Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets
Floatation of eggs in water and specific gravity of eggs of Black-crowned Night-Herons (Nycticorax nycticorax ), Snowy Egrets (Egretta thula ) and Great Egrets (Casmerodius albus ) were evaluated as methods to determine date of hatching. Although specific gravity was a better predictor of hatching date than egg flotation, both techniques were imprecise. The regression between specific...
Authors
T. W. Custer, G.W. Pendleton, R.W. Roach
Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets
Flotation of eggs in water and specific gravity of eggs of Black-crowned Night-Herons (Nycticorax nycticorax), Snowy Egrets (Egretta thula) and Great Egrets (Casmerodius albus) were evaluated as methods to determine date of hatching. Length of incubation and duration of hatching period were also documented for each species. Although species gravity was a better predictor of hatching date...
Authors
T. W. Custer, G.W. Pendleton, R.W. Roach
Redhead duck behavior on lower Laguna Madre and adjacent ponds of southern Texas Redhead duck behavior on lower Laguna Madre and adjacent ponds of southern Texas
Behavior of redheads (Aythya americana) during winter was studied on the hypersaline lower Laguna Madre and adjacent freshwater to brackish water ponds of southern Texas. On Laguna Madre, feeding (46%) and sleeping (37%) were the most common behaviors. Redheads fed more during early morning (64%) than during the rest of the day (40%); feeding activity was negatively correlated with...
Authors
C. A. Mitchell, T. W. Custer, P.J. Zwank