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A system-wide assessment of avian pr...

Ryan, Brad Alan.

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A system-wide assessment of avian predation on juvenile salmonids in the Columbia River basin based on passive integrated transponder tag recoveries.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A system-wide assessment of avian predation on juvenile salmonids in the Columbia River basin based on passive integrated transponder tag recoveries./
Author:	Ryan, Brad Alan.
Description:	131 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1267.
Contained By:	Dissertation Abstracts International66-03B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3169419
ISBN:	0542051826

A system-wide assessment of avian predation on juvenile salmonids in the Columbia River basin based on passive integrated transponder tag recoveries.
Ryan, Brad Alan.

A system-wide assessment of avian predation on juvenile salmonids in the Columbia River basin based on passive integrated transponder tag recoveries. - 131 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1267.

Thesis (Ph.D.)--Portland State University, 2005.

National Oceanic and Atmospheric Administration personnel modified passive integrated transponder (PIT) tag detection equipment, to detect PIT tags on piscivorous bird colonies in the Columbia River Basin. With the advent of this equipment over 360,000 juvenile salmonid PIT tag codes were recovered on piscivorous bird colonies between 1998 and 2003. Codes were detected from every year since 1987, the first year salmonids were tagged with PIT tags in the Columbia River Basin; however, the majority of tags were from later migration years. These tags accounted for 3.7% of all PIT-tagged salmonids released during 1998--2003, years when detection efficiency on bird colonies was relatively high. Steelhead O. mykiss and coho O. kisutch were recovered in the greatest proportion, representing 5.0 and 4.1%, respectively, of all PIT tagged smolts released between 1987--2003. The majority of tags were recovered from Caspian tern Caspia sterna and double-crested cormorant Phalacrocorax auritas colonies in the Columbia River estuary (65.2%), followed by colonies in Lake Wallula (McNary Dam Reservoir; 24.8%). In the estuary and in Lake Wallula steelhead were more vulnerable to avian predation then other salmonid species and rear-type (hatchery or wild) did not affect vulnerability. Chinook on the other hand suffered low rates of predation and in the estuary hatchery chinook suffered the majority of predation while rear-type did not affect vulnerability of chinook to avian predation in Lake Wallula. In addition, in the estuary tag detection analyses based on migration history showed tags of transported fish were frequently detected in lower proportions than those of their in-river migrant counterparts, with the pattern most pronounced in steelhead. In general accounting for system wide impacts of avian predators the Columbia River estuary is the primary source of avian predation. While Lake Wallula also poses a significant amount of avian predation at least for Snake River Basin salmonids this predation rate is dramatically reduced when transported salmonids are included in the equation.

ISBN: 0542051826Subjects--Topical Terms:

1017726
Biology, Ecology.

A system-wide assessment of avian predation on juvenile salmonids in the Columbia River basin based on passive integrated transponder tag recoveries.
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520 $a National Oceanic and Atmospheric Administration personnel modified passive integrated transponder (PIT) tag detection equipment, to detect PIT tags on piscivorous bird colonies in the Columbia River Basin. With the advent of this equipment over 360,000 juvenile salmonid PIT tag codes were recovered on piscivorous bird colonies between 1998 and 2003. Codes were detected from every year since 1987, the first year salmonids were tagged with PIT tags in the Columbia River Basin; however, the majority of tags were from later migration years. These tags accounted for 3.7% of all PIT-tagged salmonids released during 1998--2003, years when detection efficiency on bird colonies was relatively high. Steelhead O. mykiss and coho O. kisutch were recovered in the greatest proportion, representing 5.0 and 4.1%, respectively, of all PIT tagged smolts released between 1987--2003. The majority of tags were recovered from Caspian tern Caspia sterna and double-crested cormorant Phalacrocorax auritas colonies in the Columbia River estuary (65.2%), followed by colonies in Lake Wallula (McNary Dam Reservoir; 24.8%). In the estuary and in Lake Wallula steelhead were more vulnerable to avian predation then other salmonid species and rear-type (hatchery or wild) did not affect vulnerability. Chinook on the other hand suffered low rates of predation and in the estuary hatchery chinook suffered the majority of predation while rear-type did not affect vulnerability of chinook to avian predation in Lake Wallula. In addition, in the estuary tag detection analyses based on migration history showed tags of transported fish were frequently detected in lower proportions than those of their in-river migrant counterparts, with the pattern most pronounced in steelhead. In general accounting for system wide impacts of avian predators the Columbia River estuary is the primary source of avian predation. While Lake Wallula also poses a significant amount of avian predation at least for Snake River Basin salmonids this predation rate is dramatically reduced when transported salmonids are included in the equation.
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