Catherine Langtimm, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 42
Amphibian research and monitoring initiative: Concepts and implementation
This report provides the basis for discussion and subsequent articulation of a national plan for the Amphibian Research and Monitoring Initiative (ARMI). The authors were members of a task force formed from within the U.S. Geological Survey (USGS) that included scientists with expertise in biology, cartography, hydrology, and statistics. The assignment of the task force was to extend work begun by
Authors
P. S. Corn, M.J. Adams, W.A. Battaglin, Alisa L. Gallant, D.L. James, M. Knutson, C.A. Langtimm, J.R. Sauer
Capture-recapture analysis for estimating manatee reproductive rates
Modeling the life history of the endangered Florida manatee (Trichechus manatus latirostris) is an important step toward understanding its population dynamics and predicting its response to management actions. We developed a multi-state markresighting model for data collected under Pollock's robust design. This model estimates breeding probability conditional on a female's breeding state in the pr
Authors
W. L. Kendall, C.A. Langtimm, C.A. Beck, M.C. Runge
A stage-based model of manatee population dynamics
A stage-structured population model for the Florida manatee (Trichechus manatus latirostris) was developed that explicitly incorporates uncertainty in parameter estimates. The growth rates calculated with this model reflect the status of the regional populations over the most recent 10-yr period. The Northwest and Upper St. Johns River regions have growth rates (λ) of 1.037 (95% interval, 1.016–1.
Authors
M.C. Runge, C.A. Langtimm, W. L. Kendall
Survival estimates for Florida manatees from the photo-identification of individuals
We estimated adult survival probabilities for the endangered Florida manatee (Trichechus manatus latirostris) in four regional populations using photoidentification data and open-population capture-recapture statistical models. The mean annual adult survival probability over the most recent 10-yr period of available estimates was as follows: Northwest - 0.956 (SE 0.007), Upper St. Johns River - 0.
Authors
C.A. Langtimm, C.A. Beck, H.H. Edwards, K.J. Fick-Child, B.B. Ackerman, S.L. Barton, W.C. Hartley
Predicting the effects of hydrologic restoration on manatees along the southwest coast of Florida
No abstract available.
Authors
Brad Stith, Jim Reid, Susan M. Butler, Terry Doyle, Cathy Langtimm
Survival estimates for Florida manatees from the photo-identification of individuals
We estimated adult survival probabilities for the endangered Florida manatee (Trichechus manatus latirostris) in four regional populations using photo-identification data and open-population capture-recapture statistical models. The mean annual adult survival probability over the most recent 10-yr period of available estimates was as follows: Northwest - 0.956 (SE 0.007), Upper St. Johns River - 0
Authors
C.A. Langtimm, C.A. Beck, H.H. Edwards, K. J. Fick-Child, B.B. Ackerman, S.L. Barton, W.C. Hartley
A stage-based model of manatee population dynamics
A stage-structured population model for the Florida manatee (Trichechus manatus latirostris) was developed that explicitly incorporates uncertainty in parameter estimates. The growth rates calculated with this model reflect the status of the regional populations over the most recent 10-yr period. The Northwest and Upper St. Johns River regions have growth rates (8) of 1.037 (95% interval, 1.016?1.
Authors
M.C. Runge, C.A. Langtimm, W. L. Kendall
Capture-recapture analysis for estimating manatee reproductive rates
Modeling the life history of the endangered Florida manatee (Trichechus manatus latirostris) is an important step toward understanding its population dynamics and predicting its response to management actions. We developed a multi-state mark-resighting model for data collected under Pollock's robust design. This model estimates breeding probability conditional on a female's breeding state in the p
Authors
W. L. Kendall, C.A. Langtimm, C.A. Beck, M.C. Runge
Lower survival probabilities for adult Florida manatees in years with intense coastal storms
The endangered Florida manatee (Trichechus manatus latirostris) inhabits the subtropical waters of the southeastern United States, where hurricanes are a regular occurrence. Using mark-resighting statistical models, we analyzed 19 years of photo-identification data and detected significant annual variation in adult survival for a subpopulation in northwest Florida where human impact is low. That v
Authors
C.A. Langtimm, C.A. Beck
Lower survival probabilities for adult Florida manatees in years with intense coastal storms
The endangered Florida manatee (Trichechus manatus latirostris) inhabits the subtropical waters of the southeastern United States, where hurricanes are a regular occurrence. Using mark-resighting statistical models, we analyzed 19 years of photo-identification data and detected significant annual variation in adult survival for a subpopulation in northwest Florida where human impact is low. That v
Authors
C.A. Langtimm, C.A. Beck
Estimating site occupancy rates when detection probabilities are less than one
Nondetection of a species at a site does not imply that the species is absent unless the probability of detection is 1. We propose a model and likelihood-based method for estimating site occupancy rates when detection probabilities are < 1. The model provides a flexible framework enabling covariate information to be included and allowing for missing observations. Via computer simulation, we found
Authors
D.I. MacKenzie, J. D. Nichols, G.B. Lachman, Sam Droege, J. Andrew Royle, C.A. Langtimm
The U.S. National Amphibian Research and Monitoring Initiative and the role of protected areas
In response to concerns about the worldwide status of amphibians (Alford and Richards 1999; Bury 1999; Daszak et al. 1999; Houlahan et al. 2000), Congress in Fiscal Year 2000 provided initial support to agencies of the U.S. Department of the Interior for research and monitoring of amphibians. Most funds came to the U.S. Geological Survey (USGS), but additional funds for the U.S. Fish and Wildlife
Authors
Russell James Hall, Catherine A. Langtimm
Science and Products
- Publications
Filter Total Items: 42
Amphibian research and monitoring initiative: Concepts and implementation
This report provides the basis for discussion and subsequent articulation of a national plan for the Amphibian Research and Monitoring Initiative (ARMI). The authors were members of a task force formed from within the U.S. Geological Survey (USGS) that included scientists with expertise in biology, cartography, hydrology, and statistics. The assignment of the task force was to extend work begun byAuthorsP. S. Corn, M.J. Adams, W.A. Battaglin, Alisa L. Gallant, D.L. James, M. Knutson, C.A. Langtimm, J.R. SauerCapture-recapture analysis for estimating manatee reproductive rates
Modeling the life history of the endangered Florida manatee (Trichechus manatus latirostris) is an important step toward understanding its population dynamics and predicting its response to management actions. We developed a multi-state markresighting model for data collected under Pollock's robust design. This model estimates breeding probability conditional on a female's breeding state in the prAuthorsW. L. Kendall, C.A. Langtimm, C.A. Beck, M.C. RungeA stage-based model of manatee population dynamics
A stage-structured population model for the Florida manatee (Trichechus manatus latirostris) was developed that explicitly incorporates uncertainty in parameter estimates. The growth rates calculated with this model reflect the status of the regional populations over the most recent 10-yr period. The Northwest and Upper St. Johns River regions have growth rates (λ) of 1.037 (95% interval, 1.016–1.AuthorsM.C. Runge, C.A. Langtimm, W. L. KendallSurvival estimates for Florida manatees from the photo-identification of individuals
We estimated adult survival probabilities for the endangered Florida manatee (Trichechus manatus latirostris) in four regional populations using photoidentification data and open-population capture-recapture statistical models. The mean annual adult survival probability over the most recent 10-yr period of available estimates was as follows: Northwest - 0.956 (SE 0.007), Upper St. Johns River - 0.AuthorsC.A. Langtimm, C.A. Beck, H.H. Edwards, K.J. Fick-Child, B.B. Ackerman, S.L. Barton, W.C. HartleyPredicting the effects of hydrologic restoration on manatees along the southwest coast of Florida
No abstract available.AuthorsBrad Stith, Jim Reid, Susan M. Butler, Terry Doyle, Cathy LangtimmSurvival estimates for Florida manatees from the photo-identification of individuals
We estimated adult survival probabilities for the endangered Florida manatee (Trichechus manatus latirostris) in four regional populations using photo-identification data and open-population capture-recapture statistical models. The mean annual adult survival probability over the most recent 10-yr period of available estimates was as follows: Northwest - 0.956 (SE 0.007), Upper St. Johns River - 0AuthorsC.A. Langtimm, C.A. Beck, H.H. Edwards, K. J. Fick-Child, B.B. Ackerman, S.L. Barton, W.C. HartleyA stage-based model of manatee population dynamics
A stage-structured population model for the Florida manatee (Trichechus manatus latirostris) was developed that explicitly incorporates uncertainty in parameter estimates. The growth rates calculated with this model reflect the status of the regional populations over the most recent 10-yr period. The Northwest and Upper St. Johns River regions have growth rates (8) of 1.037 (95% interval, 1.016?1.AuthorsM.C. Runge, C.A. Langtimm, W. L. KendallCapture-recapture analysis for estimating manatee reproductive rates
Modeling the life history of the endangered Florida manatee (Trichechus manatus latirostris) is an important step toward understanding its population dynamics and predicting its response to management actions. We developed a multi-state mark-resighting model for data collected under Pollock's robust design. This model estimates breeding probability conditional on a female's breeding state in the pAuthorsW. L. Kendall, C.A. Langtimm, C.A. Beck, M.C. RungeLower survival probabilities for adult Florida manatees in years with intense coastal storms
The endangered Florida manatee (Trichechus manatus latirostris) inhabits the subtropical waters of the southeastern United States, where hurricanes are a regular occurrence. Using mark-resighting statistical models, we analyzed 19 years of photo-identification data and detected significant annual variation in adult survival for a subpopulation in northwest Florida where human impact is low. That vAuthorsC.A. Langtimm, C.A. BeckLower survival probabilities for adult Florida manatees in years with intense coastal storms
The endangered Florida manatee (Trichechus manatus latirostris) inhabits the subtropical waters of the southeastern United States, where hurricanes are a regular occurrence. Using mark-resighting statistical models, we analyzed 19 years of photo-identification data and detected significant annual variation in adult survival for a subpopulation in northwest Florida where human impact is low. That vAuthorsC.A. Langtimm, C.A. BeckEstimating site occupancy rates when detection probabilities are less than one
Nondetection of a species at a site does not imply that the species is absent unless the probability of detection is 1. We propose a model and likelihood-based method for estimating site occupancy rates when detection probabilities are < 1. The model provides a flexible framework enabling covariate information to be included and allowing for missing observations. Via computer simulation, we foundAuthorsD.I. MacKenzie, J. D. Nichols, G.B. Lachman, Sam Droege, J. Andrew Royle, C.A. LangtimmThe U.S. National Amphibian Research and Monitoring Initiative and the role of protected areas
In response to concerns about the worldwide status of amphibians (Alford and Richards 1999; Bury 1999; Daszak et al. 1999; Houlahan et al. 2000), Congress in Fiscal Year 2000 provided initial support to agencies of the U.S. Department of the Interior for research and monitoring of amphibians. Most funds came to the U.S. Geological Survey (USGS), but additional funds for the U.S. Fish and WildlifeAuthorsRussell James Hall, Catherine A. Langtimm - Science
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