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Catherine Langtimm, Ph.D. (Former Employee)

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Filter Total Items: 42

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
Authors
Michael Osland, Philip Stevens, Margaret Lamont, Richard Brusca, Kristen Hart, Hardin Waddle, Catherine Langtimm, Caroline Williams, Barry Keim, Adam Terando, Eric Reyier, Katie Marshall, Michael E. Loik, Ross Boucek, Amanda Lewis, Jeffrey A. Seminoff
By
Ecosystems Mission Area, 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
Authors
M. Dennis Krohn, Eric D. Swain, Catherine A. Langtimm, Jayantha Obeysekera
By
Ecosystems Mission Area, Wetland and Aquatic Research Center , Caribbean-Florida Water Science Center (CFWSC)

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
Authors
Michael C. Runge, Carol A. Sanders-Reed, Catherine A. Langtimm, Jeffrey A. Hostetler, Julien Martin, Charles J. Deutsch, Leslie I. Ward-Geiger, Gary L. Mahon
By
Ecosystems Mission Area, Species Management Research Program, 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
Authors
Catherine A. Langtimm, William L. Kendall, Cathy A. Beck, Howard I. Kochman, Amy L. Teague, Gaia Meigs-Friend, Claudia L. Peñaloza
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Evaluation of habitat suitability index models by global sensitivity and uncertainty analyses: a case study for submerged aquatic vegetation

Habitat suitability index (HSI) models are commonly used to predict habitat quality and species distributions and are used to develop biological surveys, assess reserve and management priorities, and anticipate possible change under different management or climate change scenarios. Important management decisions may be based on model results, often without a clear understanding of the level of unc
Authors
Zuzanna Zajac, Bradley Stith, Andrea C. Bowling, Catherine A. Langtimm, Eric D. Swain
By
Ecosystems Mission Area, Climate Research and Development Program, Land Change Science Program, Wetland and Aquatic Research Center

Status and threats analysis for the Florida manatee (Trichechus manatus latirostris), 2012

The endangered West Indian manatee (Trichechus manatus), especially the Florida subspecies (T. m. latirostris), has been the focus of conservation efforts and extensive research since its listing under the Endangered Species Act. On the basis of the best information available as of December 2012, the threats facing the Florida manatee were determined to be less severe than previously thought, eith
Authors
Michael C. Runge, Catherine A. Langtimm, Julien Martin, Christopher J. Fonnesbeck
By
Ecosystems Mission Area, Eastern Ecological Science Center, Wetland and Aquatic Research Center

Numerical computation of hurricane effects on historic coastal hydrology in Southern Florida

Introduction Numerical models are critical for assessing the effects of sea level rise (SLR), hurricanes, and storm surge on vegetation change in the Everglades National Park. The model must be capable of representing short-timescale hydrodynamics, salinity transport, and groundwater interaction. However, there is also a strong need to adapt these numerical models to hindcast past conditions in or
Authors
Eric D. Swain, M. Dennis Krohn, Catherine A. Langtimm
By
Caribbean-Florida Water Science Center (CFWSC)

Reducing bias in survival under non-random temporary emigration

Despite intensive monitoring, temporary emigration from the sampling area can induce bias severe enough for managers to discard life-history parameter estimates toward the terminus of the times series (terminal bias). Under random temporary emigration unbiased parameters can be estimated with CJS models. However, unmodeled Markovian temporary emigration causes bias in parameter estimates and an un
Authors
Claudia L. Peñaloza, William L. Kendall, Catherine Ann Langtimm
By
Cooperative Research Units

Assessing factors affecting the thermal properties of a passive thermal refuge using three-dimensional hydrodynamic flow and transport modeling

Everglades restoration activities may cause changes to temperature and salinity stratification at the Port of the Islands (POI) marina, which could affect its suitability as a cold weather refuge for manatees. To better understand how the Picayune Strand Restoration Project (PSRP) may alter this important resource in Collier County in southwestern Florida, the USGS has developed a three-dimensiona
Authors
Jeremy D. Decker, Eric D. Swain, Bradley Stith, Catherine A. Langtimm
By
Water Resources Mission Area, Caribbean-Florida Water Science Center (CFWSC)

Passive thermal refugia provided warm water for Florida manatees during the severe winter of 2009-2010

Haloclines induced by freshwater inflow over tidal water have been identified as an important mechanism for maintaining warm water in passive thermal refugia (PTR) used by Florida manatees Trichechus manatus latirostris during winter in extreme southwestern Florida. Record-setting cold during winter 2009–2010 resulted in an unprecedented number of manatee deaths, adding to concerns that PTR may pr
Authors
B.M. Stith, D. H. Slone, M. de Wit, H.H. Edwards, C.A. Langtimm, E.D. Swain, L.E. Soderqvist, J. P. Reid
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Estimating parameters of hidden Markov models based on marked individuals: use of robust design data

Development and use of multistate mark-recapture models, which provide estimates of parameters of Markov processes in the face of imperfect detection, have become common over the last twenty years. Recently, estimating parameters of hidden Markov models, where the state of an individual can be uncertain even when it is detected, has received attention. Previous work has shown that ignoring state u
Authors
William L. Kendall, Gary C. White, James E. Hines, Catherine A. Langtimm, Jun Yoshizaki
By
Ecosystems Mission Area, Eastern Ecological Science Center

Structured decision making as a proactive approach to dealing with sea level rise in Florida

Sea level rise (SLR) projections along the coast of Florida present an enormous challenge for management and conservation over the long term. Decision makers need to recognize and adopt strategies to adapt to the potentially detrimental effects of SLR. Structured decision making (SDM) provides a rigorous framework for the management of natural resources. The aim of SDM is to identify decisions tha
Authors
J. Martin, P.L. Fackler, James D. Nichols, B. C. Lubow, Mitchell J. Eaton, Michael C. Runge, Bradley Stith, Catherine A. Langtimm
By
Ecosystems Mission Area, Eastern Ecological Science Center, 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.
By
Ecosystems Mission Area, Species Management Research Program, Eastern Ecological Science Center, 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.
By
Ecosystems Mission Area, 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...
By
Ecosystems Mission Area, 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
link
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 Mission Area, 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.
Learn More
link
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.
By
Ecosystems Mission Area, 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
link
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.
By
Ecosystems Mission Area, 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.
Learn More
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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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