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File Movement and habitat use of Eastern hellbenders (Cryptobranchus alleganiensis alleganiensis) following population augmentation
by Morgan Harris — published Aug 10, 2020 — last modified Jul 26, 2023 01:33 PM — filed under: , , , , ,
With amphibian declines at crisis levels, translocations, including population augmentations, are commonly used for amphibian conservation. Eastern Hellbenders (Cryptobranchus alleganiensis alleganiensis) have declined to low densities in many areas of their range, making them ideal candidates for population augmentation. Both wild adults and captive-reared juveniles have been used for augmentations, but their suitability has never been directly compared. Herein, we use radio telemetry with Eastern Hellbenders to examine patterns of site fidelity, movement, and habitat use over a 2-yr period for adult residents, wild adult translocates, and captive-reared juvenile translocates. We used generalized linear models and generalized linear mixed models to identify temporal trends and explore the effects of residential status (resident vs. translocate) and origin/age (captive-reared juveniles vs. wild adults) on various ecological and behavioral traits relating to habitat. Site fidelity was high in adult residents and wild adult translocates, but lower in captive-reared juvenile translocates. Both adult and juvenile translocates had greater mean movement distances than residents, leading to larger home range sizes, but these differences decreased over time. Wild adult translocates had a higher probability of using artificial nest rocks than adult residents or captive-reared juvenile translocates. This pattern was most prevalent early in the study, indicating these shelters are particularly useful during the transition to release sites. Captive-reared juvenile translocates had lower site fidelity and utilized suboptimal habitat (smaller and fewer shelter rocks) compared to wild adults. Compared to previous studies, translocations had fewer negative effects on site residents or wild translocates and might be effective at promoting growth of Hellbender populations. However, translocations of captive-reared juveniles were less successful. As we are uncertain whether captive-rearing or ontogeny led to these differences, both longer head-starting times and conditioning should be explored to improve outcomes in captive-reared juvenile cohorts.
Located in Information Materials / Research / Artificial Nest Box Research
File Troff document Theory and practice of the hydrodynamic redesign of artifical hellbender habitat
by Morgan Harris — published Aug 10, 2020 — last modified Jul 26, 2023 01:34 PM — filed under: , , , , ,
The success of nest boxes in Missouri led researchers to test whether similar management tools could increase C. a. alleganiensis populations in the streams of western North Carolina, where these salamanders are listed as a Species of Special Concern (Messerman 2014). Fifty-four nest boxes were constructed following the boot-shaped design of Briggler and Ackerson (2012) in May 2013, and were installed across five known C. alleganiensis stream sites between late June and early August 2013. Messerman (2014) then monitored each nest box every three to four weeks through November 2013, and the boxes were revisited in August 2014 and July 2015 to observe structural condition and occupancy (Messerman, pers. obs.). Of the 54 nest boxes, only two structures at a single site were confirmed as inhabited in 2014 and 2015, and no breeding events were detected (Messerman, pers. obs.). Moreover, many of these ~50 lb concrete boxes moved in flood events or accumulated sediment at the downstream tunnel entrance (Messerman 2014). The low success of the boot-shaped nest box design in North Carolina may be attributed to the sites generally being narrower and shallower than those in Missouri, with much of the substrate consisting of bedrock slabs covered by relatively thin layers of rock, gravel and silt. Here we address the observed shortcomings of the original North Carolina design through the lens of engineering, and present a new and easily implemented nest box model for use in streams like those found in western North Carolina.
Located in Information Materials / Research / Artificial Nest Box Research
Organization University of Florida Center for Landscape Conservation Planning
by Web Editor — last modified Jun 27, 2025 04:02 PM — filed under: , , ,
An official forum within the University of Florida’s College of Design, Construction and Planning for conducting applied research on the relationship between conservation and land use, bridging the disciplines of design, planning and wildlife conservation.
Located in LP Members / Organizations Search
Habitat Selection, Movements, and Home Range of Bog Turtles in SE PA and Investigation of Grazing as a Management Tool
by Jason Tesauro — published Oct 28, 2022 — last modified Jul 24, 2023 11:24 AM — filed under: , , , , ,
Located in Information Materials / Research / WLFW Outcomes: Funded Research
Project Range-wide assessment of grazing and hydrology in bog turtle wetlands
by Bridgett Costanzo — published Oct 28, 2022 — last modified Jul 24, 2023 11:25 AM — filed under: , , , , ,
In December 2018, a meeting of bog turtle experts was hosted in Richmond, VA and experts across the Eastern range of the species identified as a high priority the need to better understand the benefits and potential negative impacts of livestock grazing in bog turtle inhabited wetlands. Hydrologic conditions in bog turtle wetlands emerged as a secondary concern needing more research. Recently, NRCS’ Conservation Effects Assessment Project (CEAP) awarded funds to Dr. Carola Haas leading a team of researchers at Virginia Tech University to conduct an assessment on these two topics (grazing and hydrology).
Located in Information Materials / Research / WLFW Outcomes: Funded Research
File NRCS WLFW Outcomes Assessment 2012-2018 (released 2021)
by Bridgett Costanzo — published Oct 28, 2022 — last modified Jul 24, 2023 11:26 AM — filed under: , , , , , , , , , ,
An outcomes assessment report completed under a contract to Dr. JJ Apodaca from NRCS-WLFW. This document is being shared with conservation partners but broad or public sharing is not approved.
Located in Information Materials / Research / WLFW Outcomes: Funded Research
Product The Effects of Livestock Grazing on the Bog Turtle
by Rhishja Cota — published Nov 08, 2022 — last modified Jul 24, 2023 11:27 AM — filed under: , , , , , , , , , , ,
The demise of small-scale dairy farming over the past three decades has led to the pastoral abandonment of the majority of bog turtle habitats in the Northeast. As a consequence, habitats are being degraded by the growth of invasive flora, changes in hydrology, and the loss of turtle microhabitats created by livestock.
Located in Information Materials / Research / Peer-reviewed Science
Product Grazing for Bog Turtle Habitat Management: Case Study of a New York Fen
by Rhishja Cota — published Nov 08, 2022 — last modified Jul 24, 2023 11:28 AM — filed under: , , , , , , , , , , , ,
This study presents results from a single wetland complex in New York, USA, which we managed primarily with cattle grazing over four and a half growing seasons. Management effectiveness was assessed by monitoring Bog Turtle nest placement, habitat use via radio tracking, and vegetation structure and composition change in permanent plots.
Located in Information Materials / Research / Peer-reviewed Science
Product Effects of Habitat Alterations on Bog Turtles (Glyptemys muhlenbergii): A Comparison of Two Populations
by Rhishja Cota — published Nov 08, 2022 — last modified Jul 24, 2023 11:29 AM — filed under: , , , , , , , , , , , , ,
This study compared Bog Turtle population demography and habitat use from 1994 to 2009 at two sites in Massachusetts, USA: one site was managed for nonnative invasive species and natural succession (Site 1), and the other site was flooded from American Beaver (Castor canadensis) activity resulting in an expansion of nonnative invasive plants (Site 2).
Located in Information Materials / Research / Peer-reviewed Science
Livestock as a Potential Biological Control Agent for an Invasive Wetland Plant
by Jason Tesauro — published Oct 28, 2022 — last modified Jul 24, 2023 11:30 AM — filed under: , , , , ,
Located in Information Materials / Research / Peer-reviewed Science