Shawn M Lehman
Dados Biográficos
| ID | 5208014 |
|---|---|
| NOME | Shawn M Lehman |
| PRENOMES | Shawn M |
| SOBRENOME | Lehman |
| ASSINATURA | LEHMAN S M |
| AFILIAÇÕES | University of Toronto |
| ORCID | 0000-0003-0191-7139 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 27 |
| TOTAL DE CITAÇÕES | 91 |
| TOTAL COMO AUTOR | 27 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1993 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2025 |
| ÍNDICE H | 5 |
Where the small things are
Edge effects result from the penetration to varying depths and intensities, of abiotic and biotic conditions from the surrounding non‐forest matrix into the forest interior. Although 70% of the world's forests are within 1 km of a forest edge, making edge effects a dominant feature of most forest habitats, there are few empirical data on inter‐site differences in edge responses in primates. We used spatially explicit capture‐recapture (SECR) mode…
Shifting Biogeographic Patterns of Microcebus ravelobensis and M. murinus
Seasonal Variations in Lemur Edge Proximity in South-Eastern Madagascar
Context and future directions for integrating forest carbon into sub-national climate mitigation planning in the RGGI region of the U.S
International frameworks for climate mitigation that build from national actions have been developed under the United National Framework Convention on Climate Change and advanced most recently through the Paris Climate Agreement. In parallel, sub-national actors have set greenhouse gas (GHG) reduction goals and developed corresponding climate mitigation plans. Within the U.S., multi-state coalitions have formed to facilitate coordination of relat…
Ecological fragmentation effects in mouse lemurs and small mammals in northwestern Madagascar
Habitat loss and fragmentation are major ecological forces threatening animal communities across the globe. These issues are especially true in Madagascar, where forest loss is ongoing. We examined the effects of forest fragmentation on the distribution and abundance of sympatric, endemic gray, and golden‐brown mouse lemurs ( Microcebus murinus and Microcebus ravelobensis ), the endemic western tuft‐tailed rat ( Eliurus myoxinus ), and the invasi…
Occurrence of lemurs in landscapes and their species‐specific scale responses to habitat loss
Studies on the impact of habitat loss on species occurrence consistently find that the amount of habitat (measured as patch area) is a major determinant of species occurrence at a patch‐level. However, patch‐level research may fail to detect important patterns and processes only observable at a landscape‐level. A landscape‐level approach that incorporates species‐specific scale responses is needed to better understand what drives species occurren…
Species‐area relationships of lemurs in a fragmented landscape in Madagascar
We used species‐area relationships (SARs) to investigate the effects of habitat loss on lemur biogeography. We measured species richness via visual surveys on line transects within 42 fragments of dry deciduous forest at the Ambanjabe field site in Ankarafantsika National Park, Madagascar. We measured human disturbance and habitat characteristics within 38 of the 42 fragments. We measured the distance between each fragment and the nearest settlem…
Geographic comparison of plant genera used in frugivory among the pitheciids Cacajao , Callicebus , Chiropotes , and Pithecia
Pitheciids are known for their frugivorous diets, but there has been no broad-scale comparison of fruit genera used by these primates that range across five geographic regions in South America. We compiled 31 fruit lists from data collected from 18 species (three Cacajao, six Callicebus, five Chiropotes, and four Pithecia) at 26 study sites in six countries. Together, these lists contained 455 plant genera from 96 families. We predicted that 1) c…
Infant transport and mother–infant contact from 1 to 26 weeks postnatal in Coquerel's sifaka ( Propithecus coquereli ) in northwestern Madagascar
Lactating females face energetic constraints absent in conspecifics and must compensate for higher energy requirements. Infant transport is the most energetically costly mammalian activity after lactation. Nonetheless, infant transport and mother-infant contact are seldom measured. The extreme seasonality characteristic of Madagascar coupled with lactation costs and infant transport is a trifold energetic challenge encountered by lemur mothers. W…
Terrestrial Activity in Pitheciins ( C acajao , C hiropotes , and P ithecia )
Neotropical monkeys of the genera C acajao , C hiropotes , and P ithecia ( P itheciidae) are considered to be highly arboreal, spending most of their time feeding and traveling in the upper canopy. Until now, the use of terrestrial substrates has not been analyzed in detail in this group. Here, we review the frequency of terrestrial use among pitheciin taxa to determine the ecological and social conditions that might lead to such behavior. We col…
Testing Bergmann's rule and the resource seasonality hypothesis in Malagasy primates using GIS‐based climate data
We tested four major hypotheses on the ecological aspects of body mass variation in extant Malagasy strepsirrhines: thermoregulation, resource seasonality/scarcity, resource quality, and primary productivity. These biogeographic hypotheses focus on the ecological aspects of body mass variation, largely ignoring the role of phylogeny for explaining body mass variation within lineages. We tested the independent effects of climate and resource‐relat…
Ecological and Phylogenetic Correlates to Body Size in the Indriidae
Test of the Optimal Body Size Model for Strepsirhines
Lemur responses to edge effects in the Vohibola III classified forest, Madagascar
Forest edges are dynamic zones characterized by the penetration (to varying depths and intensities) of conditions from the surrounding environment (matrix) into the forest interior. Although edge effects influence many tropical organisms, they have not been studied directly in primates. Edge effects are particularly relevant to lemurs because of the highly fragmented forest landscapes found in Madagascar. In this study, data are presented regardi…
Effects of Transect Selection and Seasonality on Lemur Density Estimates in Southeastern Madagascar
Edge Effects on the Density of Cheirogaleus major
Ecological Correlates to Lemur Community Structure in Southeast Madagascar
Conservation biology of malagasy strepsirhines
The phylogenetic diversity of extant lemurs represents one of the most important but least studied aspects of the conservation biology of primates. The phylogenetic diversity of a species is inversely proportional to the relative number and closeness of its phylogenetic relatives. Phylogenetic diversity can then be used to determine conservation priorities for specific biogeographic regions. Although Malagasy strepsirhines represent the highest p…
Edge effects and their influence on lemur density and distribution in Southeast Madagascar
Edge effects are caused by the penetration of abiotic and biotic conditions from the matrix into forest interiors. Although edge effects influence the biogeography of many tropical organisms, they have not been studied directly in primates. Edge effects are particularly relevant to lemurs due to the loss of 80–90% of forests in Madagascar. In this study, data are presented on how biotic edge effects influenced the distribution and density of lemu…
Ecogeographic size variations in sifakas
Ecogeographic size variations have been documented in some but not all sifakas. Few morphometric or body weight data have been available for two critically endangered subspecies of diademed sifakas: Perrier's sifakas ( Propithecus diadema perrieri ) and silky sifakas ( Propithecus diadema candidus ). The objectives of our study were to determine size variations in sifakas and if these variations are related to resource quality and/or resource sea…
Dietary patterns in Perrier's sifakas ( Propithecus diadema perrieri )
Some lemur species range into only one habitat type, whereas others range into a variety of habitats. Because plant community structure can differ between habitats, dietary patterns may vary for conspecific groups of primates that range into more than one type of habitat. The goal of our study was to determine how habitat variation influences dietary patterns in Perrier's sifakas ( Propithecus diadema perrieri ) that range into both dry and ripar…
Biogeography of the Primates of Guyana
Distribution and Diversity of Primates in Guyana
Primate Community Structure in Guyana
Climate and reproductive seasonality in two free-ranging island populations of rhesus macaques (Macaca mulatto)
Edge effects and their influence on lemur density and distribution in Southeast Madagascar
Edge effects are caused by the penetration of abiotic and biotic conditions from the matrix into forest interiors. Although edge effects influence the biogeography of many tropical organisms, they have not been studied directly in primates. Edge effects are particularly relevant to lemurs due to the loss of 80–90% of forests in Madagascar. In this study, data are presented on how biotic edge effects influenced the distribution and density of lemu…
Ecogeographic size variations in sifakas
Ecogeographic size variations have been documented in some but not all sifakas. Few morphometric or body weight data have been available for two critically endangered subspecies of diademed sifakas: Perrier's sifakas ( Propithecus diadema perrieri ) and silky sifakas ( Propithecus diadema candidus ). The objectives of our study were to determine size variations in sifakas and if these variations are related to resource quality and/or resource sea…
Edge Effects on the Density of Cheirogaleus major
Testing Bergmann's rule and the resource seasonality hypothesis in Malagasy primates using GIS‐based climate data
We tested four major hypotheses on the ecological aspects of body mass variation in extant Malagasy strepsirrhines: thermoregulation, resource seasonality/scarcity, resource quality, and primary productivity. These biogeographic hypotheses focus on the ecological aspects of body mass variation, largely ignoring the role of phylogeny for explaining body mass variation within lineages. We tested the independent effects of climate and resource‐relat…
Primate Community Structure in Guyana
Ecological and Phylogenetic Correlates to Body Size in the Indriidae
Distribution and Diversity of Primates in Guyana
Effects of Transect Selection and Seasonality on Lemur Density Estimates in Southeastern Madagascar
Ecological Correlates to Lemur Community Structure in Southeast Madagascar
Conservation biology of malagasy strepsirhines
The phylogenetic diversity of extant lemurs represents one of the most important but least studied aspects of the conservation biology of primates. The phylogenetic diversity of a species is inversely proportional to the relative number and closeness of its phylogenetic relatives. Phylogenetic diversity can then be used to determine conservation priorities for specific biogeographic regions. Although Malagasy strepsirhines represent the highest p…
Biogeography of the Primates of Guyana
Preliminary survey ofCacajao melanocephalus melanocephalus in Southern Venezuela
Shifting Biogeographic Patterns of Microcebus ravelobensis and M. murinus
Seasonal Variations in Lemur Edge Proximity in South-Eastern Madagascar
Test of the Optimal Body Size Model for Strepsirhines
Climate and reproductive seasonality in two free-ranging island populations of rhesus macaques (Macaca mulatto)
Preliminary analysis of drinking from seawater sources by free‐ranging rhesus macaques ( Macaca mulatta )
Rhesus macaques on Key Lois Island were observed drinking seawater that flowed into four holes they had excavated in the sand. Data were gathered to determine the salinity (TDS) and pH levels of the water and which animals were using the holes. Average TDS level (4,506.8 ± 1,750.8), but not pH (8.1 ± .30) level, of water from the holes differed from the surrounding seawater (TDS = 29,000, pH = 8.0). There were significant variations in TDS and pH…
Climate and reproductive seasonality in two free-ranging island populations of rhesus macaques (Macaca mulatto)
Preliminary survey ofCacajao melanocephalus melanocephalus in Southern Venezuela
Primate Community Structure in Guyana
Dietary patterns in Perrier's sifakas ( Propithecus diadema perrieri )
Some lemur species range into only one habitat type, whereas others range into a variety of habitats. Because plant community structure can differ between habitats, dietary patterns may vary for conspecific groups of primates that range into more than one type of habitat. The goal of our study was to determine how habitat variation influences dietary patterns in Perrier's sifakas ( Propithecus diadema perrieri ) that range into both dry and ripar…
Biogeography of the Primates of Guyana
Distribution and Diversity of Primates in Guyana
Ecogeographic size variations in sifakas
Ecogeographic size variations have been documented in some but not all sifakas. Few morphometric or body weight data have been available for two critically endangered subspecies of diademed sifakas: Perrier's sifakas ( Propithecus diadema perrieri ) and silky sifakas ( Propithecus diadema candidus ). The objectives of our study were to determine size variations in sifakas and if these variations are related to resource quality and/or resource sea…
Lemur responses to edge effects in the Vohibola III classified forest, Madagascar
Forest edges are dynamic zones characterized by the penetration (to varying depths and intensities) of conditions from the surrounding environment (matrix) into the forest interior. Although edge effects influence many tropical organisms, they have not been studied directly in primates. Edge effects are particularly relevant to lemurs because of the highly fragmented forest landscapes found in Madagascar. In this study, data are presented regardi…
Effects of Transect Selection and Seasonality on Lemur Density Estimates in Southeastern Madagascar
Edge Effects on the Density of Cheirogaleus major
Ecological Correlates to Lemur Community Structure in Southeast Madagascar
Conservation biology of malagasy strepsirhines
The phylogenetic diversity of extant lemurs represents one of the most important but least studied aspects of the conservation biology of primates. The phylogenetic diversity of a species is inversely proportional to the relative number and closeness of its phylogenetic relatives. Phylogenetic diversity can then be used to determine conservation priorities for specific biogeographic regions. Although Malagasy strepsirhines represent the highest p…
Edge effects and their influence on lemur density and distribution in Southeast Madagascar
Edge effects are caused by the penetration of abiotic and biotic conditions from the matrix into forest interiors. Although edge effects influence the biogeography of many tropical organisms, they have not been studied directly in primates. Edge effects are particularly relevant to lemurs due to the loss of 80–90% of forests in Madagascar. In this study, data are presented on how biotic edge effects influenced the distribution and density of lemu…
Ecological and Phylogenetic Correlates to Body Size in the Indriidae
Test of the Optimal Body Size Model for Strepsirhines
Terrestrial Activity in Pitheciins ( C acajao , C hiropotes , and P ithecia )
Neotropical monkeys of the genera C acajao , C hiropotes , and P ithecia ( P itheciidae) are considered to be highly arboreal, spending most of their time feeding and traveling in the upper canopy. Until now, the use of terrestrial substrates has not been analyzed in detail in this group. Here, we review the frequency of terrestrial use among pitheciin taxa to determine the ecological and social conditions that might lead to such behavior. We col…
Testing Bergmann's rule and the resource seasonality hypothesis in Malagasy primates using GIS‐based climate data
We tested four major hypotheses on the ecological aspects of body mass variation in extant Malagasy strepsirrhines: thermoregulation, resource seasonality/scarcity, resource quality, and primary productivity. These biogeographic hypotheses focus on the ecological aspects of body mass variation, largely ignoring the role of phylogeny for explaining body mass variation within lineages. We tested the independent effects of climate and resource‐relat…
Geographic comparison of plant genera used in frugivory among the pitheciids Cacajao , Callicebus , Chiropotes , and Pithecia
Pitheciids are known for their frugivorous diets, but there has been no broad-scale comparison of fruit genera used by these primates that range across five geographic regions in South America. We compiled 31 fruit lists from data collected from 18 species (three Cacajao, six Callicebus, five Chiropotes, and four Pithecia) at 26 study sites in six countries. Together, these lists contained 455 plant genera from 96 families. We predicted that 1) c…
Infant transport and mother–infant contact from 1 to 26 weeks postnatal in Coquerel's sifaka ( Propithecus coquereli ) in northwestern Madagascar
Lactating females face energetic constraints absent in conspecifics and must compensate for higher energy requirements. Infant transport is the most energetically costly mammalian activity after lactation. Nonetheless, infant transport and mother-infant contact are seldom measured. The extreme seasonality characteristic of Madagascar coupled with lactation costs and infant transport is a trifold energetic challenge encountered by lemur mothers. W…
Species‐area relationships of lemurs in a fragmented landscape in Madagascar
We used species‐area relationships (SARs) to investigate the effects of habitat loss on lemur biogeography. We measured species richness via visual surveys on line transects within 42 fragments of dry deciduous forest at the Ambanjabe field site in Ankarafantsika National Park, Madagascar. We measured human disturbance and habitat characteristics within 38 of the 42 fragments. We measured the distance between each fragment and the nearest settlem…
Ecological fragmentation effects in mouse lemurs and small mammals in northwestern Madagascar
Habitat loss and fragmentation are major ecological forces threatening animal communities across the globe. These issues are especially true in Madagascar, where forest loss is ongoing. We examined the effects of forest fragmentation on the distribution and abundance of sympatric, endemic gray, and golden‐brown mouse lemurs ( Microcebus murinus and Microcebus ravelobensis ), the endemic western tuft‐tailed rat ( Eliurus myoxinus ), and the invasi…
Occurrence of lemurs in landscapes and their species‐specific scale responses to habitat loss
Studies on the impact of habitat loss on species occurrence consistently find that the amount of habitat (measured as patch area) is a major determinant of species occurrence at a patch‐level. However, patch‐level research may fail to detect important patterns and processes only observable at a landscape‐level. A landscape‐level approach that incorporates species‐specific scale responses is needed to better understand what drives species occurren…
Context and future directions for integrating forest carbon into sub-national climate mitigation planning in the RGGI region of the U.S
International frameworks for climate mitigation that build from national actions have been developed under the United National Framework Convention on Climate Change and advanced most recently through the Paris Climate Agreement. In parallel, sub-national actors have set greenhouse gas (GHG) reduction goals and developed corresponding climate mitigation plans. Within the U.S., multi-state coalitions have formed to facilitate coordination of relat…
Shifting Biogeographic Patterns of Microcebus ravelobensis and M. murinus
Biology (26 obras) · Primate Behavior and Ecology (26 obras) · Ecology (23 obras) · Geography (18 obras) · Primate (17 obras) · Habitat (15 obras) · Lemur (15 obras) · Amphibian and Reptile Biology (14 obras) · Animal Behavior and Reproduction (14 obras) · Animal ecology (12 obras)