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Catherine Langtimm, Ph.D. (Former Employee)

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Filter Total Items: 42

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
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Ecosystems, Patuxent Wildlife Research Center

Tropicalization of temperate ecosystems in North America: The northward range expansion of tropical organisms in response to warming winter temperatures

Tropicalization is a term used to describe the transformation of temperate ecosystems by poleward‐moving tropical organisms in response to warming temperatures. In North America, decreases in the frequency and intensity of extreme winter cold events are expected to allow the poleward range expansion of many cold‐sensitive tropical organisms, sometimes at the expense of temperate organisms. Althoug
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Ecosystems, Climate Research and Development Program, Land Change Science Program, Wetland and Aquatic Research Center

Repurposing a hindcast simulation of the 1926 Great Miami Hurricane, south Florida

Hydrodynamic model hindcasts of the surface water and groundwater of the Everglades and the greater Miami, Florida, area were used to simulate hydrology using estimated storm surge height, wind field, and rainfall for the Great Miami Hurricane (GMH), which struck on September 18, 1926. Ranked estimates of losses from hurricanes in inflation-adjusted dollars indicate that the GMH was one of the mos
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Ecosystems, Wetland and Aquatic Research Center , Caribbean-Florida Water Science Center (CFWSC)

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
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Ecosystems, Wetland and Aquatic Research Center

Possible effects of the 2004 and 2005 hurricanes on manatee survival rates and movement

Abstract not supplied at this time
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Ecosystems, Wetland and Aquatic Research Center

Possible effects of the 2004 and 2005 hurricanes on manatee survival rates and movement

Abstract not supplied at this time
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Ecosystems, Wetland and Aquatic Research Center

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.
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Ecosystems, Eastern Ecological Science Center, Patuxent Wildlife Research Center

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
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Ecosystems, Wetland and Aquatic Research Center

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.
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Ecosystems, Wetland and Aquatic Research Center

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 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 bey
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Ecosystems, Eastern Ecological Science Center, Patuxent Wildlife Research Center

Status and threats analysis for the Florida manatee (Trichechus manatus latirostris), 2016

Trichechus manatus (West Indian manatee), especially T. m. latirostris, the Florida subspecies, has been the focus of conservation efforts and extensive research since its listing under the Endangered Species Act of 1973. To determine the status of, and severity of threats to, the Florida manatee, a comprehensive revision and update of the manatee Core Biological Model was completed and used to pe
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Ecosystems, Species Management Research Program, Patuxent Wildlife Research Center, Eastern Ecological Science Center, Wetland and Aquatic Research Center

Model description and evaluation of the mark-recapture survival model used to parameterize the 2012 status and threats analysis for the Florida manatee (Trichechus manatus latirostris)

This report provides supporting details and evidence for the rationale, validity and efficacy of a new mark-recapture model, the Barker Robust Design, to estimate regional manatee survival rates used to parameterize several components of the 2012 version of the Manatee Core Biological Model (CBM) and Threats Analysis (TA).  The CBM and TA provide scientific analyses on population viability of the
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Ecosystems, Energy & Wildlife (unpublished), Wetland and Aquatic Research Center
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Manatee swims in a Florida spring

Population Ecology of Florida Manatees

USGS is working with partners to understand how the federally protected Florida manatee population changes over time and responds to threats.
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Ecosystems, Species Management Research Program, Wetland and Aquatic Research Center
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Population Ecology of Florida Manatees

USGS is working with partners to understand how the federally protected Florida manatee population changes over time and responds to threats.
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West Indian manatees

Demographic and Population Models to Assess Recovery and Status of the Endangered Florida Manatee

Population models developed by USGS are the primary decision-support tools used for status assessments, and rely on estimates of adult survival and reproduction rates from mark-recapture studies.
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Ecosystems, Species Management Research Program, Wetland and Aquatic Research Center
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Demographic and Population Models to Assess Recovery and Status of the Endangered Florida Manatee

Population models developed by USGS are the primary decision-support tools used for status assessments, and rely on estimates of adult survival and reproduction rates from mark-recapture studies.
Learn More
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West Indian manatees, Trichechus manatus

Modeling, Estimation, and Adaptive Management of Florida Manatees

The Challenge: Florida manatees are threatened by watercraft-related mortality, the potential loss of warmwater habitat, red tide events, and other anthropogenic factors. The USFWS and the Florida Fish and Wildlife Conservation Commission have regulatory authorities under the Endangered Species Act (ESA), the Marine Mammal Protection Act (MMPA), and state statutes to recover manatees. To support...
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Ecosystems, Species Management Research Program, Eastern Ecological Science Center
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Modeling, Estimation, and Adaptive Management of Florida Manatees

The Challenge: Florida manatees are threatened by watercraft-related mortality, the potential loss of warmwater habitat, red tide events, and other anthropogenic factors. The USFWS and the Florida Fish and Wildlife Conservation Commission have regulatory authorities under the Endangered Species Act (ESA), the Marine Mammal Protection Act (MMPA), and state statutes to recover manatees. To support...
Learn More
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Florida Manatee with a tracking devise attached

Modeling Past Variation in Florida Manatee Survival, Breeding, and Movements Rates to Establish Baselines for Aquatic Ecosystem and Restoration Research

Long-term monitoring data in the Manatee Individual Photo-identification System (MIPS), developed and coordinated by WARC-Sirenia Project in collaboration with Florida’s Fish and Wildlife Research Institute and Mote Marine Laboratory, are the basis for modeling manatee demography rates.
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Ecosystems, Species Management Research Program, Wetland and Aquatic Research Center
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Modeling Past Variation in Florida Manatee Survival, Breeding, and Movements Rates to Establish Baselines for Aquatic Ecosystem and Restoration Research

Long-term monitoring data in the Manatee Individual Photo-identification System (MIPS), developed and coordinated by WARC-Sirenia Project in collaboration with Florida’s Fish and Wildlife Research Institute and Mote Marine Laboratory, are the basis for modeling manatee demography rates.
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Research diver and manatees - WARC

Manatee Photo ID as a Tool for Research: The Manatee Individual Photo-Identification System (MIPS)

Since 1978, USGS scientists have photo-documented manatees in the Southeast United States. Now, more than 3,000 manatees can be found in the MIPS database.
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Ecosystems, Species Management Research Program, Wetland and Aquatic Research Center
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Manatee Photo ID as a Tool for Research: The Manatee Individual Photo-Identification System (MIPS)

Since 1978, USGS scientists have photo-documented manatees in the Southeast United States. Now, more than 3,000 manatees can be found in the MIPS database.
Learn More
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Past and Future Impacts of Sea Level Rise on Coastal Habitats and Species

Past and Future Impacts of Sea Level Rise on Coastal Habitats and Species (FISCHS)

USGS aims to integrate biological and hydrological models to help develop management tools to deal with the projected ecological consequences of rising sea level in coastal south Florida.
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Ecosystems, Land Management Research Program, Wetland and Aquatic Research Center
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Past and Future Impacts of Sea Level Rise on Coastal Habitats and Species (FISCHS)

USGS aims to integrate biological and hydrological models to help develop management tools to deal with the projected ecological consequences of rising sea level in coastal south Florida.
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Florida Manatees Likely to Persist For At Least 100 Years—US Geological Survey  

Florida’s iconic manatee population is highly likely to endure for the next 100 years, so long as wildlife managers continue to protect the marine...

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Media Inquiries on USGS Manatee Research

We appreciate your interest in USGS' Sirenia Project. To help inform members of the media and public, we have provided relevant publications, reports...

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