Catherine Langtimm, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 35
New aerial survey and hierarchical model to estimate manatee abundance
Monitoring the response of endangered and protected species to hydrological restoration is a major component of the adaptive management framework of the Comprehensive Everglades Restoration Plan. The endangered Florida manatee (Trichechus manatus latirostris) lives at the marine-freshwater interface in southwest Florida and is likely to be affected by hydrologic restoration. To provide managers wi
Authors
Catherine A. Langtimm, Robert Dorazio, B.M. Stith, T.J. Doyle
Temperature inverted haloclines provide winter warm-water refugia for manatees in southwest Florida
Florida manatees (Trichechus manatus latirostris) overwintering in the Ten Thousand Islands and western Everglades have no access to power plants or major artesian springs that provide warm-water refugia in other parts of Florida. Instead, hundreds of manatees aggregate at artificial canals, basins, and natural deep water sites that act as passive thermal refugia (PTR). Monitoring at two canal sit
Authors
Bradley Stith, James P. Reid, Catherine A. Langtimm, Eric D. Swain, Terry J. Doyle, Daniel H. Slone, Jeremy D. Decker, Lars E. Soderqvist
Integrated Science: Florida Manatees and Everglades Hydrology
Predicting and monitoring restoration effects on Florida manatees, which are known to make extended movements, will be incomplete if modeling and monitoring are limited to the smaller areas defined by the various res-toration components. U.S. Geological Survey (USGS) efforts, thus far, have focused on (1) collecting manatee movement data throughout the Ten Thousand Islands (TTI) region, and (2) de
Authors
Catherine A. Langtimm, Eric D. Swain, Bradley Stith, James P. Reid, Daniel H. Slone, Jeremy Decker, Susan M. Butler, Terry Doyle, R.W. Snow
Non-random temporary emigration and the robust design: Conditions for bias at the end of a time series: Section VIII
Deviations from model assumptions in the application of capture–recapture models to real life situations can introduce unknown bias. Understanding the type and magnitude of bias under these conditions is important to interpreting model results. In a robust design analysis of long-term photo-documented sighting histories of the endangered Florida manatee, I found high survival rates, high rates of
Authors
Catherine A. Langtimm
A Quantitative Threats Analysis for the Florida Manatee (Trichechus manatus latirostris)
The Florida manatee (Trichechus manatus latirostris) is an endangered marine mammal endemic to the southeastern United States. The primary threats to manatee populations are collisions with watercraft and the potential loss of warm-water refuges. For the purposes of listing, recovery, and regulation under the Endangered Species Act (ESA), an understanding of the relative effects of the principal t
Authors
Michael C. Runge, Carol A. Sanders-Reed, Catherine A. Langtimm, Christopher J. Fonnesbeck
Research on the impacts of past and future hurricanes on the endangered Florida manatee
U.S. Geological Survey (USGS) research on Florida manatees (Trichechus manatus latirostris) from 1982 through 1998 identified lower apparent survival rates for adult manatees during years when Hurricane Elena (1985), the March "Storm of the Century"(1993), and Hurricane Opal (1995) hit the northern coast of the Gulf of Mexico. Although our analysis showed that a significant number of our monitored
Authors
Catherine A. Langtimm, M. Dennis Krohn, Bradley Stith, James P. Reid, C.A. Beck, Susan M. Butler
Wildlife and habitat damage assessment from Hurricane Charley: recommendations for recovery of the J. N. "Ding" Darling National Wildlife Refuge Complex
• On 13 August 2004, the first of four hurricanes to strike Florida in <6 weeks came ashore near J. N. “Ding” Darling National Wildlife Refuge (JNDDNWR) Complex, Sanibel Island, Florida. The eye of Category 4 Hurricane Charley passed just north of Sanibel Island with maximum sustained winds of 145 mph (123 knots) and a storm surge of 0.3-2.7 m (1-9 ft). Three USGS-BRD scientists (coastal ecologist
Authors
J. Michael Meyers, Catherine A. Langtimm, Thomas J. Smith, Kendra Pednault-Willett
By
Possible effects of the 2004 and 2005 hurricanes on manatee survival rates and movement
Prior research on manatee (Trichechus manatus latirostris) survival in northwest Florida, based on mark-resighting photo-identification data from 1982-1998, showed that annual adult apparent survival rate was significantly lower during years with extreme storms. Mechanisms that we proposed could have led to lower estimates included stranding, injury from debris, being fatally swept out to sea, or
Authors
C.A. Langtimm, M. D. Krohn, J. P. Reid, B.M. Stith, C.A. Beck
Amphibian research and monitoring initiative: concepts and implementation
No abstract available.
Authors
Paul Stephen Corn, M. J. Adams, William A. Battaglin, Alisa L. Gallant, Daniel L. James, Melinda Knutson, Catherine A. Langtimm, John R. Sauer
Wildlife and habitat damage assessment from Hurricane Charley: recommendations for recovery of the J. N. "Ding" Darling National Wildlife Refuge Complex. [Final report to U.S. Fish and Wildlife Service]
On 13 August 2004, the first of four hurricanes to strike Florida in 50% and sometimes 90% of their vegetation severely damaged (dead, broken tree stems, and tipped trees). Shell Mound Trail of JNDDNWR sustained catastrophic damage to its old growth mangrove forests. Direct storm mortality and injury to manatees in the area was probably slight. Because seagrass beads and manatee habitat extend
Authors
J.M. Meyers, C.A. Langtimm, T. J. Smith, K. Pednault-Willett
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
Science and Products
Filter Total Items: 35
New aerial survey and hierarchical model to estimate manatee abundance
Monitoring the response of endangered and protected species to hydrological restoration is a major component of the adaptive management framework of the Comprehensive Everglades Restoration Plan. The endangered Florida manatee (Trichechus manatus latirostris) lives at the marine-freshwater interface in southwest Florida and is likely to be affected by hydrologic restoration. To provide managers wi
Authors
Catherine A. Langtimm, Robert Dorazio, B.M. Stith, T.J. Doyle
Temperature inverted haloclines provide winter warm-water refugia for manatees in southwest Florida
Florida manatees (Trichechus manatus latirostris) overwintering in the Ten Thousand Islands and western Everglades have no access to power plants or major artesian springs that provide warm-water refugia in other parts of Florida. Instead, hundreds of manatees aggregate at artificial canals, basins, and natural deep water sites that act as passive thermal refugia (PTR). Monitoring at two canal sit
Authors
Bradley Stith, James P. Reid, Catherine A. Langtimm, Eric D. Swain, Terry J. Doyle, Daniel H. Slone, Jeremy D. Decker, Lars E. Soderqvist
Integrated Science: Florida Manatees and Everglades Hydrology
Predicting and monitoring restoration effects on Florida manatees, which are known to make extended movements, will be incomplete if modeling and monitoring are limited to the smaller areas defined by the various res-toration components. U.S. Geological Survey (USGS) efforts, thus far, have focused on (1) collecting manatee movement data throughout the Ten Thousand Islands (TTI) region, and (2) de
Authors
Catherine A. Langtimm, Eric D. Swain, Bradley Stith, James P. Reid, Daniel H. Slone, Jeremy Decker, Susan M. Butler, Terry Doyle, R.W. Snow
Non-random temporary emigration and the robust design: Conditions for bias at the end of a time series: Section VIII
Deviations from model assumptions in the application of capture–recapture models to real life situations can introduce unknown bias. Understanding the type and magnitude of bias under these conditions is important to interpreting model results. In a robust design analysis of long-term photo-documented sighting histories of the endangered Florida manatee, I found high survival rates, high rates of
Authors
Catherine A. Langtimm
A Quantitative Threats Analysis for the Florida Manatee (Trichechus manatus latirostris)
The Florida manatee (Trichechus manatus latirostris) is an endangered marine mammal endemic to the southeastern United States. The primary threats to manatee populations are collisions with watercraft and the potential loss of warm-water refuges. For the purposes of listing, recovery, and regulation under the Endangered Species Act (ESA), an understanding of the relative effects of the principal t
Authors
Michael C. Runge, Carol A. Sanders-Reed, Catherine A. Langtimm, Christopher J. Fonnesbeck
Research on the impacts of past and future hurricanes on the endangered Florida manatee
U.S. Geological Survey (USGS) research on Florida manatees (Trichechus manatus latirostris) from 1982 through 1998 identified lower apparent survival rates for adult manatees during years when Hurricane Elena (1985), the March "Storm of the Century"(1993), and Hurricane Opal (1995) hit the northern coast of the Gulf of Mexico. Although our analysis showed that a significant number of our monitored
Authors
Catherine A. Langtimm, M. Dennis Krohn, Bradley Stith, James P. Reid, C.A. Beck, Susan M. Butler
Wildlife and habitat damage assessment from Hurricane Charley: recommendations for recovery of the J. N. "Ding" Darling National Wildlife Refuge Complex
• On 13 August 2004, the first of four hurricanes to strike Florida in <6 weeks came ashore near J. N. “Ding” Darling National Wildlife Refuge (JNDDNWR) Complex, Sanibel Island, Florida. The eye of Category 4 Hurricane Charley passed just north of Sanibel Island with maximum sustained winds of 145 mph (123 knots) and a storm surge of 0.3-2.7 m (1-9 ft). Three USGS-BRD scientists (coastal ecologist
Authors
J. Michael Meyers, Catherine A. Langtimm, Thomas J. Smith, Kendra Pednault-Willett
By
Possible effects of the 2004 and 2005 hurricanes on manatee survival rates and movement
Prior research on manatee (Trichechus manatus latirostris) survival in northwest Florida, based on mark-resighting photo-identification data from 1982-1998, showed that annual adult apparent survival rate was significantly lower during years with extreme storms. Mechanisms that we proposed could have led to lower estimates included stranding, injury from debris, being fatally swept out to sea, or
Authors
C.A. Langtimm, M. D. Krohn, J. P. Reid, B.M. Stith, C.A. Beck
Amphibian research and monitoring initiative: concepts and implementation
No abstract available.
Authors
Paul Stephen Corn, M. J. Adams, William A. Battaglin, Alisa L. Gallant, Daniel L. James, Melinda Knutson, Catherine A. Langtimm, John R. Sauer
Wildlife and habitat damage assessment from Hurricane Charley: recommendations for recovery of the J. N. "Ding" Darling National Wildlife Refuge Complex. [Final report to U.S. Fish and Wildlife Service]
On 13 August 2004, the first of four hurricanes to strike Florida in 50% and sometimes 90% of their vegetation severely damaged (dead, broken tree stems, and tipped trees). Shell Mound Trail of JNDDNWR sustained catastrophic damage to its old growth mangrove forests. Direct storm mortality and injury to manatees in the area was probably slight. Because seagrass beads and manatee habitat extend
Authors
J.M. Meyers, C.A. Langtimm, T. J. Smith, K. Pednault-Willett
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