Jaime Collazo, PhD (Former Employee)
Science and Products
Filter Total Items: 91
Local annual survival and seasonal residency rates of Semipalmated Sandpipers (Calidris pusilla) in Puerto Rico Local annual survival and seasonal residency rates of Semipalmated Sandpipers (Calidris pusilla) in Puerto Rico
We report seasonal residency and local annual survival rates of migratory Semipalmated Sandpipers (Calidris pusilla) at the Cabo Rojo salt flats, Puerto Rico. Residency rate (daily probability of remaining on the flats) was 0.991 ± 0.001 (x̄ ± SE), yielding a mean length of stay of 110 days. This finding supports the inclusion of the Caribbean as part of the species' winter range...
Authors
S.M. Rice, J.A. Collazo, M.W. Alldredge, B. A. Harrington, A.R. Lewis
Lesser scaup winter foraging and nutrient reserve acquisition in east-central Florida Lesser scaup winter foraging and nutrient reserve acquisition in east-central Florida
Lesser scaup (Aythya affinis) populations have been declining since the late 1970s. One of the explanations to account for this decline, the spring-condition hypothesis (SCH), is based on the premise that scaup are limited by their ability to acquire or maintain nutrient reserves during migration to the breeding grounds, leading to an impairment of their reproductive potential. Available...
Authors
G. Herring, J.A. Collazo
Additive effects of vertebrate predators on insects in a Puerto Rican coffee plantation Additive effects of vertebrate predators on insects in a Puerto Rican coffee plantation
A variety of studies have established the value of shaded coffee plantations as habitat for birds. While the value of birds as biological controls in coffee has received some attention, the interactions between birds and other predators of insects have not been tested. We used exclosures to examine the effects of vertebrate predators on the arthropods associated with coffee, in...
Authors
R.R. Borkhataria, J.A. Collazo, Martha J. Groom
Associations of breeding birds with fire-influenced and riparian-upland gradients in a longleaf pine ecosystem Associations of breeding birds with fire-influenced and riparian-upland gradients in a longleaf pine ecosystem
We determined the effects of fire history and a riparian-upland gradient on the breeding bird community at Fort Bragg Military Installation in North Carolina, one of the largest remnant areas of the endangered longleaf pine (Pinus palustris) ecosystem. Study sites were classified into two treatments: fire-intense (areas experiencing growing-season burns) and fire-suppressed (areas...
Authors
J. C. Allen, S.M. Krieger, J. R. Walters, J.A. Collazo
Habitat use, movements and home range of wintering Lesser Scaup in Florida Habitat use, movements and home range of wintering Lesser Scaup in Florida
Radio telemetry and diurnal time activity budgets were used to show that wintering Lesser Scaup (Aythya affinis) used different habitats for comfort and feeding activities at Merritt Island National Wildlife Refuge (Merritt Island), Florida and adjacent estuarine areas. Management should take this spatial consideration into account. The same data were used to determine if habitat use...
Authors
Garth Herring, Jaime A. Collazo
Plasma lipid metabolites and refueling performance of Semi palmated Sandpipers at migratory stopovers Plasma lipid metabolites and refueling performance of Semi palmated Sandpipers at migratory stopovers
Assessing stopover habitat quality and refueling performance of individual birds is crucial to the conservation and management of migratory shorebirds. Plasma lipid metabolites indicate the trajectory of mass change in individuals and may be a more accurate measure of refueling performance at a particular site than static measures such as nutrient reserves. We measured lipid metabolites...
Authors
J. E. Lyons, J.A. Collazo, C. Guglielmo
Science and Products
Filter Total Items: 91
Local annual survival and seasonal residency rates of Semipalmated Sandpipers (Calidris pusilla) in Puerto Rico Local annual survival and seasonal residency rates of Semipalmated Sandpipers (Calidris pusilla) in Puerto Rico
We report seasonal residency and local annual survival rates of migratory Semipalmated Sandpipers (Calidris pusilla) at the Cabo Rojo salt flats, Puerto Rico. Residency rate (daily probability of remaining on the flats) was 0.991 ± 0.001 (x̄ ± SE), yielding a mean length of stay of 110 days. This finding supports the inclusion of the Caribbean as part of the species' winter range...
Authors
S.M. Rice, J.A. Collazo, M.W. Alldredge, B. A. Harrington, A.R. Lewis
Lesser scaup winter foraging and nutrient reserve acquisition in east-central Florida Lesser scaup winter foraging and nutrient reserve acquisition in east-central Florida
Lesser scaup (Aythya affinis) populations have been declining since the late 1970s. One of the explanations to account for this decline, the spring-condition hypothesis (SCH), is based on the premise that scaup are limited by their ability to acquire or maintain nutrient reserves during migration to the breeding grounds, leading to an impairment of their reproductive potential. Available...
Authors
G. Herring, J.A. Collazo
Additive effects of vertebrate predators on insects in a Puerto Rican coffee plantation Additive effects of vertebrate predators on insects in a Puerto Rican coffee plantation
A variety of studies have established the value of shaded coffee plantations as habitat for birds. While the value of birds as biological controls in coffee has received some attention, the interactions between birds and other predators of insects have not been tested. We used exclosures to examine the effects of vertebrate predators on the arthropods associated with coffee, in...
Authors
R.R. Borkhataria, J.A. Collazo, Martha J. Groom
Associations of breeding birds with fire-influenced and riparian-upland gradients in a longleaf pine ecosystem Associations of breeding birds with fire-influenced and riparian-upland gradients in a longleaf pine ecosystem
We determined the effects of fire history and a riparian-upland gradient on the breeding bird community at Fort Bragg Military Installation in North Carolina, one of the largest remnant areas of the endangered longleaf pine (Pinus palustris) ecosystem. Study sites were classified into two treatments: fire-intense (areas experiencing growing-season burns) and fire-suppressed (areas...
Authors
J. C. Allen, S.M. Krieger, J. R. Walters, J.A. Collazo
Habitat use, movements and home range of wintering Lesser Scaup in Florida Habitat use, movements and home range of wintering Lesser Scaup in Florida
Radio telemetry and diurnal time activity budgets were used to show that wintering Lesser Scaup (Aythya affinis) used different habitats for comfort and feeding activities at Merritt Island National Wildlife Refuge (Merritt Island), Florida and adjacent estuarine areas. Management should take this spatial consideration into account. The same data were used to determine if habitat use...
Authors
Garth Herring, Jaime A. Collazo
Plasma lipid metabolites and refueling performance of Semi palmated Sandpipers at migratory stopovers Plasma lipid metabolites and refueling performance of Semi palmated Sandpipers at migratory stopovers
Assessing stopover habitat quality and refueling performance of individual birds is crucial to the conservation and management of migratory shorebirds. Plasma lipid metabolites indicate the trajectory of mass change in individuals and may be a more accurate measure of refueling performance at a particular site than static measures such as nutrient reserves. We measured lipid metabolites...
Authors
J. E. Lyons, J.A. Collazo, C. Guglielmo