Richard J Camp
Specialty: Quantitative ecology; abundance and demographic modeling; avian ecology and conservation
Research Interests: Status and trend estimation; Bayesian inference; hierarchical modeling; spatial and temporal modeling; population dynamics modeling
Personal Interests: Running, bicycling, beer brewing and family
Education and Certifications
Ph.D. 2020 Statistics, University of St Andrews, St Andrews, Scotland
M.S. 1995 Wildlife Biology, Colorado State University, Fort Collins, CO
B.S. 1991 Wildlife Management, University of Minnesota, Minneapolis, MN
Science and Products
Filter Total Items: 70
No evidence of critical slowing down in two endangered Hawaiian honeycreepers
There is debate about the current population trends and predicted short-term fates of the endangered forest birds, Hawai`i Creeper (Loxops mana) and Hawai`i `Ākepa (L. coccineus). Using long-term population size estimates, some studies report forest bird populations as stable or increasing, while other studies report signs of population decline or impending extinction associated with introduced Ja
Authors
Jessica C. Rozek, Richard J. Camp, J. Michael Reed
Hawai`i forest bird monitoring database: Database dictionary
Between 1976 and 1981, the U.S. Fish and Wildlife Service (now U.S. Geological Survey – Pacific Island Ecosystems Research Center [USGS-PIERC]) conducted systematic surveys of forest birds and plant communities on all the main Hawaiian Islands, except O‘ahu, as part of the Hawai‘i Forest Bird Surveys (HFBS). Results of this monumental effort have guided conservation efforts and provided the basis
Authors
Richard J. Camp, Ayesha Genz
Model-based approaches to deal with detectability: a comment on Hutto (2016)
In a recent paper, Hutto (2016a) challenges the need to account for detectability when interpreting data from point counts. A number of issues with model-based approaches to deal with detectability are presented, and an alternative suggested: surveying an area around each point over which detectability is assumed certain. The article contains a number of false claims and errors of logic, and we ad
Authors
Tiago A. Marques, Len Thomas, Marc Kéry, Steve T. Buckland, David L. Borchers, Eric Rexstad, Rachel M. Fewster, Darryl I. MacKenzie, Andy Royle, Gurutzeta Guillera-Arroita, Colleen M. Handel, David C. Pavlacky, Richard J. Camp
Pacific Island landbird monitoring report, Hawaiʻi Volcanoes National Park, 2015-2016: Tract groups 1 and 2
Hawaiʻi Volcanoes National Park (HAVO) was surveyed for landbirds and landbird habitat from February through April 2015 and February through April 2016. This information provides the second datum in the time-series of Pacific Island Network (PACN) monitoring for long-term trends in landbird distribution, density, and abundance. Initial PACN surveys were conducted in 2010 and are repeated every fiv
Authors
Seth Judge, Richard J. Camp, Daniel Sedgwick, Carine Squibb, Patrick J. Hart
Collapsing avian community on a Hawaiian island
The viability of many species has been jeopardized by numerous negative factors over the centuries, but climate change is predicted to accelerate and increase the pressure of many of these threats, leading to extinctions. The Hawaiian honeycreepers, famous for their spectacular adaptive radiation, are predicted to experience negative responses to climate change, given their susceptibility to intro
Authors
Eben H. Paxton, Richard J. Camp, P. Marcos Gorresen, Lisa H. Crampton, David L. Leonard, Eric VanderWerf
State-space modeling of population sizes and trends in Nihoa Finch and Millerbird
Both of the 2 passerines endemic to Nihoa Island, Hawai‘i, USA—the Nihoa Millerbird (Acrocephalus familiaris kingi) and Nihoa Finch (Telespiza ultima)—are listed as endangered by federal and state agencies. Their abundances have been estimated by irregularly implemented fixed-width strip-transect sampling from 1967 to 2012, from which area-based extrapolation of the raw counts produced highly vari
Authors
P. Marcos Gorresen, Kevin W. Brinck, Richard J. Camp, Chris Farmer, Sheldon M. Plentovich, Paul C. Banko
2015-2016 Palila abundance estimates
The palila (Loxioides bailleui) population was surveyed annually during 1998−2016 on Mauna Kea Volcano to determine abundance, population trend, and spatial distribution. In the latest surveys, the 2015 population was estimated at 852−1,406 birds (point estimate: 1,116) and the 2016 population was estimated at 1,494−2,385 (point estimate: 1,934). Similar numbers of palila were detected during the
Authors
Richard J. Camp, Kevin W. Brinck, Paul C. Banko
Comparative demographics of a Hawaiian forest bird community
Estimates of demographic parameters such as survival and reproductive success are critical for guiding management efforts focused on species of conservation concern. Unfortunately, reliable demographic parameters are difficult to obtain for any species, but especially for rare or endangered species. Here we derived estimates of adult survival and recruitment in a community of Hawaiian forest birds
Authors
Alban Guillaumet, Bethany L. Woodworth, Richard J. Camp, Eben H. Paxton
Current land bird distribution and trends in population abundance between 1982 and 2012 on Rota, Mariana Islands
The western Pacific island of Rota is the fourth largest human-inhabited island in the Mariana archipelago and designated an Endemic Bird Area. Between 1982 and 2012, 12 point-transect distance-sampling surveys were conducted to assess bird population status. Surveys did not consistently sample the entire island; thus, we used a ratio estimator to estimate bird abundances in strata not sampled dur
Authors
Richard J. Camp, Kevin W. Brinck, P. Marcos Gorresen, Fred A. Amidon, Paul M. Radley, S. Paul Berkowitz, Paul C. Banko
Evaluating abundance and trends in a Hawaiian avian community using state-space analysis
Estimating population abundances and patterns of change over time are important in both ecology and conservation. Trend assessment typically entails fitting a regression to a time series of abundances to estimate population trajectory. However, changes in abundance estimates from year-to-year across time are due to both true variation in population size (process variation) and variation due to imp
Authors
Richard J. Camp, Kevin W. Brinck, P. M. Gorresen, Eben H. Paxton
Farallon de Medinilla seabird and Tinian moorhen analyses
This report assesses the trends in brown booby (Sula leucogaster), masked booby (S. dactylatra), and red-footed booby (S. sula) counts collected on Farallon de Medinilla and Mariana common moorhen (Gallinula chloropus guami) counts on Tinian, Commonwealth of the Northern Mariana Islands to help elucidate patterns in bird numbers. During either monthly or quarterly surveys between 1997 and 2014 cou
Authors
Richard J. Camp, Christina R. Leopold, Kevin W. Brinck, Franz Juola
Evaluating the long-term management of introduced ungulates to protect the palila, an endangered bird, and its criticial habitat in subalpine forest of Mauna Kea, Hawai'i
Under the multiple-use paradigm, conflicts may arise when protection of an endangered species must compete with other management objectives. To resolve such a conflict in the Critical Habitat of the endangered Hawaiian honeycreeper, palila (Loxioides bailleui), federal courts ordered the eradication of introduced ungulates responsible for damaging the māmane (Sophora chrysophylla) forest on which
Authors
Paul C. Banko, Steven C. Hess, Paul G. Scowcroft, Chris Farmer, James D. Jacobi, Robert M. Stephens, Richard J. Camp, David L. Leonard, Kevin W. Brinck, J.O. Juvik, S. P. Juvik
Science and Products
Filter Total Items: 70
No evidence of critical slowing down in two endangered Hawaiian honeycreepers
There is debate about the current population trends and predicted short-term fates of the endangered forest birds, Hawai`i Creeper (Loxops mana) and Hawai`i `Ākepa (L. coccineus). Using long-term population size estimates, some studies report forest bird populations as stable or increasing, while other studies report signs of population decline or impending extinction associated with introduced Ja
Authors
Jessica C. Rozek, Richard J. Camp, J. Michael Reed
Hawai`i forest bird monitoring database: Database dictionary
Between 1976 and 1981, the U.S. Fish and Wildlife Service (now U.S. Geological Survey – Pacific Island Ecosystems Research Center [USGS-PIERC]) conducted systematic surveys of forest birds and plant communities on all the main Hawaiian Islands, except O‘ahu, as part of the Hawai‘i Forest Bird Surveys (HFBS). Results of this monumental effort have guided conservation efforts and provided the basis
Authors
Richard J. Camp, Ayesha Genz
Model-based approaches to deal with detectability: a comment on Hutto (2016)
In a recent paper, Hutto (2016a) challenges the need to account for detectability when interpreting data from point counts. A number of issues with model-based approaches to deal with detectability are presented, and an alternative suggested: surveying an area around each point over which detectability is assumed certain. The article contains a number of false claims and errors of logic, and we ad
Authors
Tiago A. Marques, Len Thomas, Marc Kéry, Steve T. Buckland, David L. Borchers, Eric Rexstad, Rachel M. Fewster, Darryl I. MacKenzie, Andy Royle, Gurutzeta Guillera-Arroita, Colleen M. Handel, David C. Pavlacky, Richard J. Camp
Pacific Island landbird monitoring report, Hawaiʻi Volcanoes National Park, 2015-2016: Tract groups 1 and 2
Hawaiʻi Volcanoes National Park (HAVO) was surveyed for landbirds and landbird habitat from February through April 2015 and February through April 2016. This information provides the second datum in the time-series of Pacific Island Network (PACN) monitoring for long-term trends in landbird distribution, density, and abundance. Initial PACN surveys were conducted in 2010 and are repeated every fiv
Authors
Seth Judge, Richard J. Camp, Daniel Sedgwick, Carine Squibb, Patrick J. Hart
Collapsing avian community on a Hawaiian island
The viability of many species has been jeopardized by numerous negative factors over the centuries, but climate change is predicted to accelerate and increase the pressure of many of these threats, leading to extinctions. The Hawaiian honeycreepers, famous for their spectacular adaptive radiation, are predicted to experience negative responses to climate change, given their susceptibility to intro
Authors
Eben H. Paxton, Richard J. Camp, P. Marcos Gorresen, Lisa H. Crampton, David L. Leonard, Eric VanderWerf
State-space modeling of population sizes and trends in Nihoa Finch and Millerbird
Both of the 2 passerines endemic to Nihoa Island, Hawai‘i, USA—the Nihoa Millerbird (Acrocephalus familiaris kingi) and Nihoa Finch (Telespiza ultima)—are listed as endangered by federal and state agencies. Their abundances have been estimated by irregularly implemented fixed-width strip-transect sampling from 1967 to 2012, from which area-based extrapolation of the raw counts produced highly vari
Authors
P. Marcos Gorresen, Kevin W. Brinck, Richard J. Camp, Chris Farmer, Sheldon M. Plentovich, Paul C. Banko
2015-2016 Palila abundance estimates
The palila (Loxioides bailleui) population was surveyed annually during 1998−2016 on Mauna Kea Volcano to determine abundance, population trend, and spatial distribution. In the latest surveys, the 2015 population was estimated at 852−1,406 birds (point estimate: 1,116) and the 2016 population was estimated at 1,494−2,385 (point estimate: 1,934). Similar numbers of palila were detected during the
Authors
Richard J. Camp, Kevin W. Brinck, Paul C. Banko
Comparative demographics of a Hawaiian forest bird community
Estimates of demographic parameters such as survival and reproductive success are critical for guiding management efforts focused on species of conservation concern. Unfortunately, reliable demographic parameters are difficult to obtain for any species, but especially for rare or endangered species. Here we derived estimates of adult survival and recruitment in a community of Hawaiian forest birds
Authors
Alban Guillaumet, Bethany L. Woodworth, Richard J. Camp, Eben H. Paxton
Current land bird distribution and trends in population abundance between 1982 and 2012 on Rota, Mariana Islands
The western Pacific island of Rota is the fourth largest human-inhabited island in the Mariana archipelago and designated an Endemic Bird Area. Between 1982 and 2012, 12 point-transect distance-sampling surveys were conducted to assess bird population status. Surveys did not consistently sample the entire island; thus, we used a ratio estimator to estimate bird abundances in strata not sampled dur
Authors
Richard J. Camp, Kevin W. Brinck, P. Marcos Gorresen, Fred A. Amidon, Paul M. Radley, S. Paul Berkowitz, Paul C. Banko
Evaluating abundance and trends in a Hawaiian avian community using state-space analysis
Estimating population abundances and patterns of change over time are important in both ecology and conservation. Trend assessment typically entails fitting a regression to a time series of abundances to estimate population trajectory. However, changes in abundance estimates from year-to-year across time are due to both true variation in population size (process variation) and variation due to imp
Authors
Richard J. Camp, Kevin W. Brinck, P. M. Gorresen, Eben H. Paxton
Farallon de Medinilla seabird and Tinian moorhen analyses
This report assesses the trends in brown booby (Sula leucogaster), masked booby (S. dactylatra), and red-footed booby (S. sula) counts collected on Farallon de Medinilla and Mariana common moorhen (Gallinula chloropus guami) counts on Tinian, Commonwealth of the Northern Mariana Islands to help elucidate patterns in bird numbers. During either monthly or quarterly surveys between 1997 and 2014 cou
Authors
Richard J. Camp, Christina R. Leopold, Kevin W. Brinck, Franz Juola
Evaluating the long-term management of introduced ungulates to protect the palila, an endangered bird, and its criticial habitat in subalpine forest of Mauna Kea, Hawai'i
Under the multiple-use paradigm, conflicts may arise when protection of an endangered species must compete with other management objectives. To resolve such a conflict in the Critical Habitat of the endangered Hawaiian honeycreeper, palila (Loxioides bailleui), federal courts ordered the eradication of introduced ungulates responsible for damaging the māmane (Sophora chrysophylla) forest on which
Authors
Paul C. Banko, Steven C. Hess, Paul G. Scowcroft, Chris Farmer, James D. Jacobi, Robert M. Stephens, Richard J. Camp, David L. Leonard, Kevin W. Brinck, J.O. Juvik, S. P. Juvik