Jeffrey T Kerby
Biographic Data
| ID | 5204987 |
|---|---|
| NAME | Jeffrey T Kerby |
| GIVEN NAMES | Jeffrey T |
| FAMILY NAME | Kerby |
| SIGNATURE | KERBY J T |
| AFFILIATIONS | Dartmouth College |
| ORCID | 0000-0002-2739-9096 |
| VERIFIED | Yes |
| TOTAL WORKS | 11 |
| TOTAL CITATIONS | 21 |
| AUTHOR COUNT | 11 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2011 |
| LATEST PUBLICATION YEAR | 2025 |
| H-INDEX | 2 |
Snow persistence lowers and delays peak NDVI, the vegetation index that underpins Arctic greening analyses
Satellite imagery is critical for understanding land-surface change in the rapidly warming Arctic. Since the 1980s, studies have found positive trends in the normalised difference vegetation index (NDVI) derived from satellite imagery over the Arctic—commonly referred to as ‘Arctic greening’ and assumed to represent increased vegetation productivity. However, greening analyses use satellite imagery with pixel sizes ranging from tens to hundreds o…
Growth rings show limited evidence for ungulates’ potential to suppress shrubs across the Arctic
Global warming has pronounced effects on tundra vegetation, and rising mean temperatures increase plant growth potential across the Arctic biome. Herbivores may counteract the warming impacts by reducing plant growth, but the strength of this effect may depend on prevailing regional climatic conditions. To study how ungulates interact with temperature to influence growth of tundra shrubs across the Arctic tundra biome, we assembled dendroecologic…
Leopard predation on gelada monkeys at Guassa, Ethiopia
Predation is widely believed to exert strong selective pressure on primate behavior and ecology but is difficult to study and rarely observed. In this study, we describe seven encounters between lone wild leopards ( Panthera pardus ) and herds of geladas ( Theropithecus gelada ) over a 6‐year period in an intact Afroalpine grassland ecosystem at the Guassa Community Conservation Area, Ethiopia. Three encounters consisted of attempted predation on…
Reindeer use of low Arctic tundra correlates with landscape structure
Rapid climate change in Arctic regions is linked to the expansion of woody taxa ( shrubification ), and an increase in biomass as tundra becomes greener. Reindeer and caribou ( Rangifer tarandus ) are considered able to suppress vegetative greening through grazing and trampling. Quantifying reindeer use of different land cover types can help us understand their impact on the growth and recruitment of deciduous shrubs, many of which serve as fodde…
Drone data reveal heterogeneity in tundra greenness and phenology not captured by satellites
Data across scales are required to monitor ecosystem responses to rapid warming in the Arctic and to interpret tundra greening trends.Here, we tested the correspondence among satellite-and drone-derived seasonal change in tundra greenness to identify optimal spatial scales for vegetation monitoring on Qikiqtaruk-Herschel Island in the Yukon Territory, Canada.We combined time-series of the Normalised Difference Vegetation Index (NDVI) from multisp…
Aboveground biomass corresponds strongly with drone-derived canopy height but weakly with greenness (NDVI) in a shrub tundra landscape
Arctic landscapes are changing rapidly in response to warming, but future predictions are hindered by difficulties in scaling ecological relationships from plots to biomes. Unmanned aerial systems (hereafter ‘drones’) are increasingly used to observe Arctic ecosystems over broader extents than can be measured using ground-based approaches and are facilitating the interpretation of coarse-grained remotely sensed data. However, more information is …
Arctic climate shifts drive rapid ecosystem responses across the West Greenland landscape
Prediction of high latitude response to climate change is hampered by poor understanding of the role of nonlinear changes in ecosystem forcing and response. While the effects of nonlinear climate change are often delayed or dampened by internal ecosystem dynamics, recent warming events in the Arctic have driven rapid environmental response, raising questions of how terrestrial and freshwater systems in this region may shift in response to abrupt …
Comparative primate obstetrics: Observations of 15 diurnal births in wild gelada monkeys ( Theropithecus gelada ) and their implications for understanding human and nonhuman primate birth evolution
OBJECTIVES: The birth process has been studied extensively in many human societies, yet little is known about this essential life history event in other primates. Here, we provide the most detailed account of behaviors surrounding birth for any wild nonhuman primate to date. MATERIALS AND METHODS: Over a recent ∼10-year period, we directly observed 15 diurnal births (13 live births and 2 stillbirths) among geladas (Theropithecus gelada) at Guassa…
Fitness impacts of tapeworm parasitism on wild gelada monkeys at Guassa, Ethiopia
Parasitism is expected to impact host morbidity or mortality, although the fitness costs of parasitism have rarely been quantified for wildlife hosts. Tapeworms in the genus Taenia exploit a variety of vertebrates, including livestock, humans, and geladas (Theropithecus gelada), monkeys endemic to the alpine grasslands of Ethiopia. Despite Taenia's adverse societal and economic impacts, we know little about the prevalence of disease associated wi…
Gelada feeding ecology in an intact ecosystem at Guassa, Ethiopia: Variability over time and implications for theropith and hominin dietary evolution
Recent evidence suggests that several extinct primates, including contemporaneous Paranthropus boisei and Theropithecus oswaldi in East Africa, fed largely on grasses and sedges (i.e., graminoids). As the only living primate graminivores, gelada monkeys ( Theropithecus gelada ) can yield insights into the dietary strategies pursued by extinct grass‐ and sedge‐eating primates. Past studies of gelada diet were of short duration and occurred in heav…
Death among geladas ( Theropithecus gelada ): A broader perspective on mummified infants and primate thanatology
Despite intensive study in humans, responses to dying and death have been a neglected area of research in other social mammals, including nonhuman primates. Two recent reports [Anderson JR, Gillies A, Lock LC. 2010. Pan thanatology. Current Biology 20:R349–R351; Biro D, Humle T, Koops K, Souse C, Hayashi M, Matsuzawa T. 2010. Chimpanzee mothers at Bossou, Guinea carry the mummified remains of their dead infants. Current Biology 20:R351–R352] offe…
Gelada feeding ecology in an intact ecosystem at Guassa, Ethiopia: Variability over time and implications for theropith and hominin dietary evolution
Recent evidence suggests that several extinct primates, including contemporaneous Paranthropus boisei and Theropithecus oswaldi in East Africa, fed largely on grasses and sedges (i.e., graminoids). As the only living primate graminivores, gelada monkeys ( Theropithecus gelada ) can yield insights into the dietary strategies pursued by extinct grass‐ and sedge‐eating primates. Past studies of gelada diet were of short duration and occurred in heav…
Comparative primate obstetrics: Observations of 15 diurnal births in wild gelada monkeys ( Theropithecus gelada ) and their implications for understanding human and nonhuman primate birth evolution
OBJECTIVES: The birth process has been studied extensively in many human societies, yet little is known about this essential life history event in other primates. Here, we provide the most detailed account of behaviors surrounding birth for any wild nonhuman primate to date. MATERIALS AND METHODS: Over a recent ∼10-year period, we directly observed 15 diurnal births (13 live births and 2 stillbirths) among geladas (Theropithecus gelada) at Guassa…
Death among geladas ( Theropithecus gelada ): A broader perspective on mummified infants and primate thanatology
Despite intensive study in humans, responses to dying and death have been a neglected area of research in other social mammals, including nonhuman primates. Two recent reports [Anderson JR, Gillies A, Lock LC. 2010. Pan thanatology. Current Biology 20:R349–R351; Biro D, Humle T, Koops K, Souse C, Hayashi M, Matsuzawa T. 2010. Chimpanzee mothers at Bossou, Guinea carry the mummified remains of their dead infants. Current Biology 20:R351–R352] offe…
Gelada feeding ecology in an intact ecosystem at Guassa, Ethiopia: Variability over time and implications for theropith and hominin dietary evolution
Recent evidence suggests that several extinct primates, including contemporaneous Paranthropus boisei and Theropithecus oswaldi in East Africa, fed largely on grasses and sedges (i.e., graminoids). As the only living primate graminivores, gelada monkeys ( Theropithecus gelada ) can yield insights into the dietary strategies pursued by extinct grass‐ and sedge‐eating primates. Past studies of gelada diet were of short duration and occurred in heav…
Fitness impacts of tapeworm parasitism on wild gelada monkeys at Guassa, Ethiopia
Parasitism is expected to impact host morbidity or mortality, although the fitness costs of parasitism have rarely been quantified for wildlife hosts. Tapeworms in the genus Taenia exploit a variety of vertebrates, including livestock, humans, and geladas (Theropithecus gelada), monkeys endemic to the alpine grasslands of Ethiopia. Despite Taenia's adverse societal and economic impacts, we know little about the prevalence of disease associated wi…
Comparative primate obstetrics: Observations of 15 diurnal births in wild gelada monkeys ( Theropithecus gelada ) and their implications for understanding human and nonhuman primate birth evolution
OBJECTIVES: The birth process has been studied extensively in many human societies, yet little is known about this essential life history event in other primates. Here, we provide the most detailed account of behaviors surrounding birth for any wild nonhuman primate to date. MATERIALS AND METHODS: Over a recent ∼10-year period, we directly observed 15 diurnal births (13 live births and 2 stillbirths) among geladas (Theropithecus gelada) at Guassa…
Arctic climate shifts drive rapid ecosystem responses across the West Greenland landscape
Prediction of high latitude response to climate change is hampered by poor understanding of the role of nonlinear changes in ecosystem forcing and response. While the effects of nonlinear climate change are often delayed or dampened by internal ecosystem dynamics, recent warming events in the Arctic have driven rapid environmental response, raising questions of how terrestrial and freshwater systems in this region may shift in response to abrupt …
Leopard predation on gelada monkeys at Guassa, Ethiopia
Predation is widely believed to exert strong selective pressure on primate behavior and ecology but is difficult to study and rarely observed. In this study, we describe seven encounters between lone wild leopards ( Panthera pardus ) and herds of geladas ( Theropithecus gelada ) over a 6‐year period in an intact Afroalpine grassland ecosystem at the Guassa Community Conservation Area, Ethiopia. Three encounters consisted of attempted predation on…
Reindeer use of low Arctic tundra correlates with landscape structure
Rapid climate change in Arctic regions is linked to the expansion of woody taxa ( shrubification ), and an increase in biomass as tundra becomes greener. Reindeer and caribou ( Rangifer tarandus ) are considered able to suppress vegetative greening through grazing and trampling. Quantifying reindeer use of different land cover types can help us understand their impact on the growth and recruitment of deciduous shrubs, many of which serve as fodde…
Drone data reveal heterogeneity in tundra greenness and phenology not captured by satellites
Data across scales are required to monitor ecosystem responses to rapid warming in the Arctic and to interpret tundra greening trends.Here, we tested the correspondence among satellite-and drone-derived seasonal change in tundra greenness to identify optimal spatial scales for vegetation monitoring on Qikiqtaruk-Herschel Island in the Yukon Territory, Canada.We combined time-series of the Normalised Difference Vegetation Index (NDVI) from multisp…
Aboveground biomass corresponds strongly with drone-derived canopy height but weakly with greenness (NDVI) in a shrub tundra landscape
Arctic landscapes are changing rapidly in response to warming, but future predictions are hindered by difficulties in scaling ecological relationships from plots to biomes. Unmanned aerial systems (hereafter ‘drones’) are increasingly used to observe Arctic ecosystems over broader extents than can be measured using ground-based approaches and are facilitating the interpretation of coarse-grained remotely sensed data. However, more information is …
Growth rings show limited evidence for ungulates’ potential to suppress shrubs across the Arctic
Global warming has pronounced effects on tundra vegetation, and rising mean temperatures increase plant growth potential across the Arctic biome. Herbivores may counteract the warming impacts by reducing plant growth, but the strength of this effect may depend on prevailing regional climatic conditions. To study how ungulates interact with temperature to influence growth of tundra shrubs across the Arctic tundra biome, we assembled dendroecologic…
Snow persistence lowers and delays peak NDVI, the vegetation index that underpins Arctic greening analyses
Satellite imagery is critical for understanding land-surface change in the rapidly warming Arctic. Since the 1980s, studies have found positive trends in the normalised difference vegetation index (NDVI) derived from satellite imagery over the Arctic—commonly referred to as ‘Arctic greening’ and assumed to represent increased vegetation productivity. However, greening analyses use satellite imagery with pixel sizes ranging from tens to hundreds o…
Biology (11 works) · Ecology (11 works) · Geography (7 works) · Climate change and permafrost (6 works) · Environmental Science (6 works) · Arctic (5 works) · Cryospheric studies and observations (5 works) · Geology (5 works) · Primate (5 works) · Primate Behavior and Ecology (5 works)