Bob Gresswell, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 78
Changing patterns in coastal cutthroat trout (Oncorhynchus clarki clarki) diet and prey in a gradient of deciduous canopies Changing patterns in coastal cutthroat trout (Oncorhynchus clarki clarki) diet and prey in a gradient of deciduous canopies
We examined the influence of riparian vegetation patterns on coastal cutthroat trout Oncorhynchus clarki clarki diet and prey from the summer of 2001 through the spring of 2002. Benthic and drifting invertebrates, allochthonous prey, and fish diet were collected from deciduous, conifer, and mixed sections of three Oregon coastal watersheds. The nine sites were best characterized as a...
Authors
N. Romero, R. E. Gresswell, J.L. Li
Evaluating single-pass catch as a tool for identifying spatial pattern in fish distribution Evaluating single-pass catch as a tool for identifying spatial pattern in fish distribution
We evaluate the efficacy of single-pass electrofishing without blocknets as a tool for collecting spatially continuous fish distribution data in headwater streams. We compare spatial patterns in abundance, sampling effort, and length-frequency distributions from single-pass sampling of coastal cutthroat trout (Oncorhynchus clarki clarki) to data obtained from a more precise multiple-pass...
Authors
Douglas S. Bateman, Robert E. Gresswell, Christian E. Torgersen
Describing spatial pattern in stream networks: A practical approach Describing spatial pattern in stream networks: A practical approach
The shape and configuration of branched networks influence ecological patterns and processes. Recent investigations of network influences in riverine ecology stress the need to quantify spatial structure not only in a two-dimensional plane, but also in networks. An initial step in understanding data from stream networks is discerning non-random patterns along the network. On the other...
Authors
L.M. Ganio, C.E. Torgersen, R. E. Gresswell
Factors influencing within-watershed genetic variation of coastal cutthroat trout Factors influencing within-watershed genetic variation of coastal cutthroat trout
No abstract available.
Authors
J. E. B. Wofford, R. E. Gresswell, M. A. Banks
A geostatistical approach for describing spatial pattern in stream networks A geostatistical approach for describing spatial pattern in stream networks
The shape and configuration of branched networks influence ecological patterns and processes. Recent investigations of network influences in riverine ecology stress the need to quantify spatial structure not only in a two-dimensional plane, but also in networks. An initial step in understanding data from stream networks is discerning non-random patterns along the network. On the other...
Authors
L.M. Ganio, C.E. Torgersen, R. E. Gresswell
Influence of barriers to movement on within-watershed genetic variation of coastal cutthroat trout Influence of barriers to movement on within-watershed genetic variation of coastal cutthroat trout
Because human land use activities often result in increased fragmentation of aquatic and terrestrial habitats, a better understanding of the effects of fragmentation on the genetic heterogeneity of animal populations may be useful for effective management. We used eight microsatellites to examine the genetic structure of coastal cutthroat trout (Oncorhynchus clarki clarki) in Camp Creek...
Authors
John E. B. Wofford, Robert E. Gresswell, Michael A. Banks
Science and Products
Filter Total Items: 78
Changing patterns in coastal cutthroat trout (Oncorhynchus clarki clarki) diet and prey in a gradient of deciduous canopies Changing patterns in coastal cutthroat trout (Oncorhynchus clarki clarki) diet and prey in a gradient of deciduous canopies
We examined the influence of riparian vegetation patterns on coastal cutthroat trout Oncorhynchus clarki clarki diet and prey from the summer of 2001 through the spring of 2002. Benthic and drifting invertebrates, allochthonous prey, and fish diet were collected from deciduous, conifer, and mixed sections of three Oregon coastal watersheds. The nine sites were best characterized as a...
Authors
N. Romero, R. E. Gresswell, J.L. Li
Evaluating single-pass catch as a tool for identifying spatial pattern in fish distribution Evaluating single-pass catch as a tool for identifying spatial pattern in fish distribution
We evaluate the efficacy of single-pass electrofishing without blocknets as a tool for collecting spatially continuous fish distribution data in headwater streams. We compare spatial patterns in abundance, sampling effort, and length-frequency distributions from single-pass sampling of coastal cutthroat trout (Oncorhynchus clarki clarki) to data obtained from a more precise multiple-pass...
Authors
Douglas S. Bateman, Robert E. Gresswell, Christian E. Torgersen
Describing spatial pattern in stream networks: A practical approach Describing spatial pattern in stream networks: A practical approach
The shape and configuration of branched networks influence ecological patterns and processes. Recent investigations of network influences in riverine ecology stress the need to quantify spatial structure not only in a two-dimensional plane, but also in networks. An initial step in understanding data from stream networks is discerning non-random patterns along the network. On the other...
Authors
L.M. Ganio, C.E. Torgersen, R. E. Gresswell
Factors influencing within-watershed genetic variation of coastal cutthroat trout Factors influencing within-watershed genetic variation of coastal cutthroat trout
No abstract available.
Authors
J. E. B. Wofford, R. E. Gresswell, M. A. Banks
A geostatistical approach for describing spatial pattern in stream networks A geostatistical approach for describing spatial pattern in stream networks
The shape and configuration of branched networks influence ecological patterns and processes. Recent investigations of network influences in riverine ecology stress the need to quantify spatial structure not only in a two-dimensional plane, but also in networks. An initial step in understanding data from stream networks is discerning non-random patterns along the network. On the other...
Authors
L.M. Ganio, C.E. Torgersen, R. E. Gresswell
Influence of barriers to movement on within-watershed genetic variation of coastal cutthroat trout Influence of barriers to movement on within-watershed genetic variation of coastal cutthroat trout
Because human land use activities often result in increased fragmentation of aquatic and terrestrial habitats, a better understanding of the effects of fragmentation on the genetic heterogeneity of animal populations may be useful for effective management. We used eight microsatellites to examine the genetic structure of coastal cutthroat trout (Oncorhynchus clarki clarki) in Camp Creek...
Authors
John E. B. Wofford, Robert E. Gresswell, Michael A. Banks