Miranda Terwilliger | National Park Service (original) (raw)

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Papers by Miranda Terwilliger

Research paper thumbnail of M. Wilmking et al.: Modeling spatial variability of white spruce (Picea glauca) in Alaska 113 MODELING SPATIAL VARIABILITY OF WHITE SPRUCE (PICEA GLAUCA) GROWTH RESPONSES TO CLIMATE CHANGE AT AND BELOW TREELINE IN ALASKA – A CASE STUDY FROM TWO NATIONAL P

von Weißfichte an der Baumgrenze im Denali Nationalpark (DNP) und Gates of the Arctic Nationalpar... more von Weißfichte an der Baumgrenze im Denali Nationalpark (DNP) und Gates of the Arctic Nationalpark (GAAR) in Alaska

Research paper thumbnail of Comparison of Aerial Thermal Infrared Imagery and Helicopter Surveys of Bison (Bison bison) in Grand Canyon National Park, USA

Sensors (Basel, Switzerland), 2021

Aerial thermal infrared (TIR) surveys are an attractive option for estimating abundances of large... more Aerial thermal infrared (TIR) surveys are an attractive option for estimating abundances of large mammals inhabiting extensive and heterogeneous terrain. Compared to standard helicopter or fixed-wing aerial surveys, TIR flights can be conducted at higher altitudes translating into greater spatial coverage and increased observer safety; however, monetary costs are much greater. Further, there is no consensus on whether TIR surveys offer improved detection. Consequently, we performed a study to compare results of a TIR and helicopter survey of bison (Bison bison) on the Powell Plateau in Grand Canyon National Park, USA. We also compared results of both surveys to estimates obtained using a larger dataset of bison helicopter detections along the entire North Rim of the Grand Canyon. Observers in the TIR survey counted fewer individual bison than helicopter observers (101 to 127) and the TIR survey cost was 367% higher. Additionally, the TIR estimate was 18.8% lower than the estimate ob...

Research paper thumbnail of Management of the Kaibab Plateau bison herd in Grand Canyon National Park: 2018–2019 operations report

, publishes a range of reports that address natural resource topics. These reports are of interes... more , publishes a range of reports that address natural resource topics. These reports are of interest and applicability to a broad audience in the National Park Service and others in natural resource management, including scientists, conservation and environmental constituencies, and the public. The Natural Resource Report Series is used to disseminate comprehensive information and analysis about natural resources and related topics concerning lands managed by the National Park Service. The series supports the advancement of science, informed decision-making, and the achievement of the National Park Service mission. The series also provides a forum for presenting more lengthy results that may not be accepted by publications with page limitations. All manuscripts in the series receive the appropriate level of peer review to ensure that the information is scientifically credible, technically accurate, appropriately written for the intended audience, and designed and published in a professional manner. This report received formal, high-level peer review based on the importance of its content, or its potentially controversial or precedent-setting nature. Peer review was conducted by highly qualified individuals with subject area technical expertise and was overseen by a peer review manager.

Research paper thumbnail of Population and Habitat Analyses for Dall's Sheep (Ovis Dalli) in Wrangell-St. Elias National Park and Preserve

We summarized and statistically analyzed historical fixed-wing aerial surveys (1949-2002) and har... more We summarized and statistically analyzed historical fixed-wing aerial surveys (1949-2002) and harvest records (1983-2002) of Dall's sheep (Ovis dalli dalli) from Wrangell-St. Elias National Park and Preserve (WRST). Among survey units there were significant ...

Research paper thumbnail of Volatile Compounds from Anal Glands of the Wolverine, Gulo gulo

Journal of Chemical Ecology, 2005

Dichloromethane extracts of wolverine (Gulo gulo, Mustelinae, Mustelidae) anal gland secretion we... more Dichloromethane extracts of wolverine (Gulo gulo, Mustelinae, Mustelidae) anal gland secretion were examined by gas chromatographyYmass spectrometry. The secretion composition was complex and variable for the six samples examined: 123 compounds were detected in total, with the number per animal ranging from 45 to 71 compounds. Only six compounds were common to all extracts: 3-methylbutanoic acid, 2-methylbutanoic acid, phenylacetic acid, a-tocopherol, cholesterol, and a compound tentatively identified as 2-methyldecanoic acid. The highly odoriferous thietanes and dithiolanes found in anal gland secretions of some members of the Mustelinae [ferrets, mink, stoats, and weasels (Mustela spp.) and zorillas (Ictonyx spp.)] were not observed. The composition of the wolverine's anal gland secretion is similar to that of two other members of the Mustelinae, the pine and beech marten (Martes spp.).

Research paper thumbnail of Volatile Compounds from Anal Glands of the Wolverine, Gulo gulo

Journal of Chemical Ecology, 2005

Dichloromethane extracts of wolverine (Gulo gulo, Mustelinae, Mustelidae) anal gland secretion we... more Dichloromethane extracts of wolverine (Gulo gulo, Mustelinae, Mustelidae) anal gland secretion were examined by gas chromatographyYmass spectrometry. The secretion composition was complex and variable for the six samples examined: 123 compounds were detected in total, with the number per animal ranging from 45 to 71 compounds. Only six compounds were common to all extracts: 3-methylbutanoic acid, 2-methylbutanoic acid, phenylacetic acid, a-tocopherol, cholesterol, and a compound tentatively identified as 2-methyldecanoic acid. The highly odoriferous thietanes and dithiolanes found in anal gland secretions of some members of the Mustelinae [ferrets, mink, stoats, and weasels (Mustela spp.) and zorillas (Ictonyx spp.)] were not observed. The composition of the wolverine's anal gland secretion is similar to that of two other members of the Mustelinae, the pine and beech marten (Martes spp.).

Research paper thumbnail of M. Wilmking et al.: Modeling spatial variability of white spruce (Picea glauca) in Alaska 113 MODELING SPATIAL VARIABILITY OF WHITE SPRUCE (PICEA GLAUCA) GROWTH RESPONSES TO CLIMATE CHANGE AT AND BELOW TREELINE IN ALASKA – A CASE STUDY FROM TWO NATIONAL P

von Weißfichte an der Baumgrenze im Denali Nationalpark (DNP) und Gates of the Arctic Nationalpar... more von Weißfichte an der Baumgrenze im Denali Nationalpark (DNP) und Gates of the Arctic Nationalpark (GAAR) in Alaska

Research paper thumbnail of Comparison of Aerial Thermal Infrared Imagery and Helicopter Surveys of Bison (Bison bison) in Grand Canyon National Park, USA

Sensors (Basel, Switzerland), 2021

Aerial thermal infrared (TIR) surveys are an attractive option for estimating abundances of large... more Aerial thermal infrared (TIR) surveys are an attractive option for estimating abundances of large mammals inhabiting extensive and heterogeneous terrain. Compared to standard helicopter or fixed-wing aerial surveys, TIR flights can be conducted at higher altitudes translating into greater spatial coverage and increased observer safety; however, monetary costs are much greater. Further, there is no consensus on whether TIR surveys offer improved detection. Consequently, we performed a study to compare results of a TIR and helicopter survey of bison (Bison bison) on the Powell Plateau in Grand Canyon National Park, USA. We also compared results of both surveys to estimates obtained using a larger dataset of bison helicopter detections along the entire North Rim of the Grand Canyon. Observers in the TIR survey counted fewer individual bison than helicopter observers (101 to 127) and the TIR survey cost was 367% higher. Additionally, the TIR estimate was 18.8% lower than the estimate ob...

Research paper thumbnail of Management of the Kaibab Plateau bison herd in Grand Canyon National Park: 2018–2019 operations report

, publishes a range of reports that address natural resource topics. These reports are of interes... more , publishes a range of reports that address natural resource topics. These reports are of interest and applicability to a broad audience in the National Park Service and others in natural resource management, including scientists, conservation and environmental constituencies, and the public. The Natural Resource Report Series is used to disseminate comprehensive information and analysis about natural resources and related topics concerning lands managed by the National Park Service. The series supports the advancement of science, informed decision-making, and the achievement of the National Park Service mission. The series also provides a forum for presenting more lengthy results that may not be accepted by publications with page limitations. All manuscripts in the series receive the appropriate level of peer review to ensure that the information is scientifically credible, technically accurate, appropriately written for the intended audience, and designed and published in a professional manner. This report received formal, high-level peer review based on the importance of its content, or its potentially controversial or precedent-setting nature. Peer review was conducted by highly qualified individuals with subject area technical expertise and was overseen by a peer review manager.

Research paper thumbnail of Population and Habitat Analyses for Dall's Sheep (Ovis Dalli) in Wrangell-St. Elias National Park and Preserve

We summarized and statistically analyzed historical fixed-wing aerial surveys (1949-2002) and har... more We summarized and statistically analyzed historical fixed-wing aerial surveys (1949-2002) and harvest records (1983-2002) of Dall's sheep (Ovis dalli dalli) from Wrangell-St. Elias National Park and Preserve (WRST). Among survey units there were significant ...

Research paper thumbnail of Volatile Compounds from Anal Glands of the Wolverine, Gulo gulo

Journal of Chemical Ecology, 2005

Dichloromethane extracts of wolverine (Gulo gulo, Mustelinae, Mustelidae) anal gland secretion we... more Dichloromethane extracts of wolverine (Gulo gulo, Mustelinae, Mustelidae) anal gland secretion were examined by gas chromatographyYmass spectrometry. The secretion composition was complex and variable for the six samples examined: 123 compounds were detected in total, with the number per animal ranging from 45 to 71 compounds. Only six compounds were common to all extracts: 3-methylbutanoic acid, 2-methylbutanoic acid, phenylacetic acid, a-tocopherol, cholesterol, and a compound tentatively identified as 2-methyldecanoic acid. The highly odoriferous thietanes and dithiolanes found in anal gland secretions of some members of the Mustelinae [ferrets, mink, stoats, and weasels (Mustela spp.) and zorillas (Ictonyx spp.)] were not observed. The composition of the wolverine's anal gland secretion is similar to that of two other members of the Mustelinae, the pine and beech marten (Martes spp.).

Research paper thumbnail of Volatile Compounds from Anal Glands of the Wolverine, Gulo gulo

Journal of Chemical Ecology, 2005

Dichloromethane extracts of wolverine (Gulo gulo, Mustelinae, Mustelidae) anal gland secretion we... more Dichloromethane extracts of wolverine (Gulo gulo, Mustelinae, Mustelidae) anal gland secretion were examined by gas chromatographyYmass spectrometry. The secretion composition was complex and variable for the six samples examined: 123 compounds were detected in total, with the number per animal ranging from 45 to 71 compounds. Only six compounds were common to all extracts: 3-methylbutanoic acid, 2-methylbutanoic acid, phenylacetic acid, a-tocopherol, cholesterol, and a compound tentatively identified as 2-methyldecanoic acid. The highly odoriferous thietanes and dithiolanes found in anal gland secretions of some members of the Mustelinae [ferrets, mink, stoats, and weasels (Mustela spp.) and zorillas (Ictonyx spp.)] were not observed. The composition of the wolverine's anal gland secretion is similar to that of two other members of the Mustelinae, the pine and beech marten (Martes spp.).