Bird Distribution and Abundance - Ocean Survival of Salmonids

Bird Distribution and Abundance - Ocean Survival of Salmonids

A study to evaluate the role of changing ocean conditions on growth and survival of juvenile salmon from the Columbia River basin as they enter the Columbia River plume and Pacific Northwest coastal habitats. Adult returns vary dramatically (over 10 fold) as a result of changing (good or bad) ocean conditions juveniles experience. Evaluating the benefit of restoration efforts in the Columbia River to restore endangered salmon populations needs to consider ocean conditions as a contributing factor to recovery. This is a large collaborative project with contributions from NWFSC, Oregon State University, and Oregon Health and Science University.

The work focuses on three objectives:

1) Determining the distribution, growth, and condition of juvenile Columbia River Chinook and coho salmon in the plume and their ocean environments with associated physical and biological features, and effects on salmon survival via regular spring and summer surveys.

2) Using additional focused surveys to obtain critical pieces of information on predator impacts, specific food resources, biological condition, and means by which juvenile salmon exit the Columbia River estuary.

3) Synthesizing the early ocean ecology of juvenile Columbia River Chinook and coho salmon, test mechanisms that control salmonid growth and survival, and produce ecological indices that forecast salmonid survival.

This project provides critical information on marine survival to the Columbia River salmonid management community (hydrosystem, harvest, hatchery, and habitat management) provides environmental indicators useful for forecasting salmon returns, and provides a greater understanding of ecological controls on salmon populations. This is a long-term monitoring and research project initiated in 1998.

Species, abundance, and distribution of birds during salmon surveys.


NameSocrata field nameColumn name in sgr mountData typeDescription
Decimal Latitudedecimal_latitudedecimal_latitudeTextThis is the latitude of the survey station.
Local Monthlocal_monthlocal_monthTextThis is the local month, represented as text.
MonthmonthmonthTextThis is the calendar month, represented as a number.
Station Codestation_codestation_codeTextThis is the unique database code used to identify an oceanographic station for a given year, month, and day.
Transect Nametransect_nametransect_nameTextThis is the two-letter designation for each east-west survey transect in the survey.
Station Namestation_namestation_nameTextThis is the nearest survey station to which a given bird (or other) density has been assigned.
Segment Species Countsegment_species_countsegment_species_countTextThis is the total count, in whole numbers, of species sightings assigned to a given station.
Distance From Shoredistance_from_shoredistance_from_shoreTextThis is the distance (in nautical miles) of the survey station from the shoreline where the transect line would intersect the coastline if it were extended all the way to shore.
YearyearyearTextThis is the calendar year; add "2000" to get the year, e.g. "3" = "2003", "11" = "2011".
Species Codespecies_codespecies_codeTextThese are four-letter species codes that typically follow the American Ornithologists' Union code for bird species or taxon (see For marine mammals, large fishes, or other objects, a similar four-letter code is assigned to that sighting.
Log Densitylog_densitylog_densityTextThis is the logarithm, base 10, of the raw density.
Segment Distance for Sumssegment_distance_for_sumssegment_distance_for_sumsTextThis is the segment distance (in kilometers) along the transect that was assigned to a given station.
Area Surveyed for Sumsarea_surveyed_for_sumsarea_surveyed_for_sumsTextThis is the area covered by the visual survey (in square kilometers) and over which species sightings were summed and assigned to a given station.
DensitydensitydensityTextThis is the density, in individuals per square kilometer, assigned to a given survey station.
Local Datelocal_datelocal_dateCalendar dateThis is the local date represented in DD-MM-YY format, where YY begins from the year 2000.
Decimal Longitudedecimal_longitudedecimal_longitudeTextThis is the longitude of the survey station.

Upstream Metadata