John M. Pearce, Ph.D. (Former Employee)
Science and Products
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A genetic evaluation of morphology used to identify harvested Canada geese A genetic evaluation of morphology used to identify harvested Canada geese
Using maximum likelihood estimators (in genetic stock identification), we used genetic markers to evaluate the utility of 2 morphological measures (culmen length and plumage color) to correctly identify groups of hunter-harvested dusky (Branta canadensis occidentalis) and dusky-like Canada geese on the wintering grounds within the Pacific Flyway. Significant levels of genetic...
Authors
John Pearce, Barbara Pierson, Sandra Talbot, Dirk Derksen, Donald Kraege, Kim Scribner
Microsatellites: Evolutionary and methodological background and empirical applications at individual, population, and phylogenetic levels Microsatellites: Evolutionary and methodological background and empirical applications at individual, population, and phylogenetic levels
The recent proliferation and greater accessibility of molecular genetic markers has led to a growing appreciation of the ecological and evolutionary inferences that can be drawn from molecular characterizations of individuals and populations (Burke et al. 1992, Avise 1994). Different techniques have the ability to target DNA sequences which have different patterns of inheritance...
Authors
Kim Scribner, John Pearce
Status and biology of the Steller's eider in Yakutia, Russia Status and biology of the Steller's eider in Yakutia, Russia
No abstract available.
Authors
Andrei Degtyarev, S.M. Sleptsov, S.P. Troev, John Pearce, Margaret Petersen
Dinucleotide repeat polymorphisms in waterfowl (family Anatidae): Characterization of a sex-linked (Z-specific) and 14 autosomal loci Dinucleotide repeat polymorphisms in waterfowl (family Anatidae): Characterization of a sex-linked (Z-specific) and 14 autosomal loci
Canada goose (Branta Canadensis) and harlequin duck (Histrionicus histrionicus) DNAs were digested with Sau3AI, and size selected (300-700 bp) fragments were ligated into BamHI-digested pBluscriptII KS+. The enrichment protocol of Ostrander et al.1 was followed. The resulting libraries were screened using a [ƴ-32P]ATP end-labelled (CA)20 oligonucleotides as a hybridization probe...
Authors
W.G. Buchholz, John Pearce, Barbara Pierson, Kim Scribner
Birds of the Indigirka River Delta, Russia: Historical and biogeographic comparisons Birds of the Indigirka River Delta, Russia: Historical and biogeographic comparisons
We documented the breeding status and relative abundance of all avian species on the coastal portion of the Indigirka River Delta during spring and summer 1993-95. Data on avifaunal composition were then compared to data from adjacent areas from Eastern Siberia to the Chukotka Peninsula to evaluate how species composition changes longitudinally within the arctic and typical tundra zones...
Authors
John Pearce, Daniel Esler, Andrei Degtyarev
Nesting ecology of Spectacled Eiders Somateria fischeri on the Indigirka River Delta, Russia Nesting ecology of Spectacled Eiders Somateria fischeri on the Indigirka River Delta, Russia
In 1994 and 1995 we investigated breeding biology and nest site habitat of Spectacled Eiders on two study areas within the coastal fringe of the Indigirka River Delta, Russia (71°20' N, 150°20' E). Spectacled Eiders were first observed on 6 June in both years and nesting commenced by mid-June. Average clutch size declined with later nest initiation dates by 0.10 eggs per day; clutches...
Authors
John Pearce, Daniel Esler, Andrei Degtyarev
Nest materials as a source of genetic data for avian ecological studies Nest materials as a source of genetic data for avian ecological studies
We examined the utility of feathers and egg shell membranes, deposited in the nests of Spectacled Eiders (Somateria fischeri), as a source of DNA for genetic studies at both the population and individual level. The potential for feather DNA contamination as a result of female behavioral interactions (e.g. nest parasitism), reuse of nest sites from previous years, or other unknown...
Authors
John Pearce, R.L. Fields, Kim Scribner
Identifying injury by wildlife to trees and shrubs in northeastern forests Identifying injury by wildlife to trees and shrubs in northeastern forests
No abstract available.
Authors
John Pearce
Science and Products
Filter Total Items: 42
Filter Total Items: 29
No results found.
Filter Total Items: 80
A genetic evaluation of morphology used to identify harvested Canada geese A genetic evaluation of morphology used to identify harvested Canada geese
Using maximum likelihood estimators (in genetic stock identification), we used genetic markers to evaluate the utility of 2 morphological measures (culmen length and plumage color) to correctly identify groups of hunter-harvested dusky (Branta canadensis occidentalis) and dusky-like Canada geese on the wintering grounds within the Pacific Flyway. Significant levels of genetic...
Authors
John Pearce, Barbara Pierson, Sandra Talbot, Dirk Derksen, Donald Kraege, Kim Scribner
Microsatellites: Evolutionary and methodological background and empirical applications at individual, population, and phylogenetic levels Microsatellites: Evolutionary and methodological background and empirical applications at individual, population, and phylogenetic levels
The recent proliferation and greater accessibility of molecular genetic markers has led to a growing appreciation of the ecological and evolutionary inferences that can be drawn from molecular characterizations of individuals and populations (Burke et al. 1992, Avise 1994). Different techniques have the ability to target DNA sequences which have different patterns of inheritance...
Authors
Kim Scribner, John Pearce
Status and biology of the Steller's eider in Yakutia, Russia Status and biology of the Steller's eider in Yakutia, Russia
No abstract available.
Authors
Andrei Degtyarev, S.M. Sleptsov, S.P. Troev, John Pearce, Margaret Petersen
Dinucleotide repeat polymorphisms in waterfowl (family Anatidae): Characterization of a sex-linked (Z-specific) and 14 autosomal loci Dinucleotide repeat polymorphisms in waterfowl (family Anatidae): Characterization of a sex-linked (Z-specific) and 14 autosomal loci
Canada goose (Branta Canadensis) and harlequin duck (Histrionicus histrionicus) DNAs were digested with Sau3AI, and size selected (300-700 bp) fragments were ligated into BamHI-digested pBluscriptII KS+. The enrichment protocol of Ostrander et al.1 was followed. The resulting libraries were screened using a [ƴ-32P]ATP end-labelled (CA)20 oligonucleotides as a hybridization probe...
Authors
W.G. Buchholz, John Pearce, Barbara Pierson, Kim Scribner
Birds of the Indigirka River Delta, Russia: Historical and biogeographic comparisons Birds of the Indigirka River Delta, Russia: Historical and biogeographic comparisons
We documented the breeding status and relative abundance of all avian species on the coastal portion of the Indigirka River Delta during spring and summer 1993-95. Data on avifaunal composition were then compared to data from adjacent areas from Eastern Siberia to the Chukotka Peninsula to evaluate how species composition changes longitudinally within the arctic and typical tundra zones...
Authors
John Pearce, Daniel Esler, Andrei Degtyarev
Nesting ecology of Spectacled Eiders Somateria fischeri on the Indigirka River Delta, Russia Nesting ecology of Spectacled Eiders Somateria fischeri on the Indigirka River Delta, Russia
In 1994 and 1995 we investigated breeding biology and nest site habitat of Spectacled Eiders on two study areas within the coastal fringe of the Indigirka River Delta, Russia (71°20' N, 150°20' E). Spectacled Eiders were first observed on 6 June in both years and nesting commenced by mid-June. Average clutch size declined with later nest initiation dates by 0.10 eggs per day; clutches...
Authors
John Pearce, Daniel Esler, Andrei Degtyarev
Nest materials as a source of genetic data for avian ecological studies Nest materials as a source of genetic data for avian ecological studies
We examined the utility of feathers and egg shell membranes, deposited in the nests of Spectacled Eiders (Somateria fischeri), as a source of DNA for genetic studies at both the population and individual level. The potential for feather DNA contamination as a result of female behavioral interactions (e.g. nest parasitism), reuse of nest sites from previous years, or other unknown...
Authors
John Pearce, R.L. Fields, Kim Scribner
Identifying injury by wildlife to trees and shrubs in northeastern forests Identifying injury by wildlife to trees and shrubs in northeastern forests
No abstract available.
Authors
John Pearce