GCMD

Summary

Abstract: Principal Investigator(s)/Affiliation: Thomas P. Dohl, Center for Marine Studies, University of California, Santa Cruz.Marine Mammal and Seabird Surveys Of Central And Northern California Studies: -- Central/Northern Calif - Low Aerial [Birds and Mammals] Study Code: CL Contract Number: 14-12-0001-29090

Purpose: To determine species composition, distribution, abundance, and seasonal variation for marine mammal and seabird populations, provide a description of habitat use, and identify areas of special biological importance to these populations in the central and northern California study area.

SUPPLEMENTAL INFORMATION:

DATA COLLECTION:
TIME ... PERIOD: February 1980 through June 1983
STUDY AREA: Shelf, slope, and offshore waters to a distance of 100 nm off the California coast from Point Conception to the California-Oregon boundary.

METHODOLOGY: Offshore transect surveys were flown twice-monthly at two different altitudes (200 ft and about 750-1,000 ft ASL) along approximately 40 east-west transect lines extending an average of 60 nm offshore. The transects sampled on a given survey were selected randomly from a set of 92 standard (predetermined) lines spaced at intervals of 5' of latitude. Standard transects provided systematic coverage of shelf, slope, and offshore waters in the study area. Sightings of seabirds, pinnipeds, and sea otters were recorded only on low-altitude surveys. Sightings of cetaceans and turtles were recorded on both low- and high-altitude surveys. Seabird sightings were recorded only on the shaded side of the aircraft within a strip transect of 50 m width. Marine mammal and turtle sightings were recorded within an unbounded corridor on both high- and low-altitude surveys, but only the shaded side of the aircraft was searched on the low-altitude surveys. Cross-legs connecting standard transects were searched only on high-altitude surveys. Offshore cross-legs were searched on both sides of the aircraft, while only the nearshore side was searched on cross-legs along the coast. Declination angle was measured and noted for each marine mammal/turtle sightings and later used to calculate a probability density function of frequency with right-angle sighting distance. Navigation was by Loran and VLF-Omega.

DATABASES PRODUCED: Three databases of sightings at sea were produced by these studies (data on numbers of seabirds and pinnipeds on land were also collected but are not addressed in the present study). These include 1) sightings of cetaceans and turtles recorded on 36 high-altitude aerial surveys, 2) sightings of cetaceans, pinnipeds, sea otters, and turtles recorded on 36 low-altitude aerial surveys, and 3) sightings of seabirds on 36 low-altitude aerial surveys. Each sighting database is accompanied by files providing the search effort on transect and environmental characteristics of the waters surveyed (e.g., sea surface temperature).

CURRENTNESS REFERENCE: ground condition

SPATIAL REFERENCE INFORMATION - GEODETIC MODEL
Horizontal Datum Name: D_WGS_1984
Ellipsoid Name: WGS_1984
Semi-major Axis: 6378137.000000
Denominator of Flattening Ratio: 298.257224

Related URL

Link: GET DATA

Description: Access data from the OBIS and OBIS-SEAMAP websites.

Data Set Citation

Dataset Originator/Creator: Minerals Management Service

Dataset Title: MMS Central/Northern California Low-altitude birds and mammals

Dataset Series Name: OBIS-SEAMAP

Dataset Release Date: 2006-03-21 17:34:57-05

Dataset Release Place: http://seamap.env.duke.edu/

Dataset Publisher: OBIS-SEAMAP

Data Presentation Form: vector digital data

Online Resource: http://www.mms.gov/

Parent DIF

This data set description is a member of a collection. The collection is described in
OBIS-SEAMAP

Temporal Coverage

Start Date: 1980-02-25

Stop Date: 1983-01-29

Location Keywords

OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN

GEOGRAPHIC REGION > ARCTIC

GEOGRAPHIC REGION > POLAR

CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > CALIFORNIA

Science Keywords

AGRICULTURE > AGRICULTURAL AQUATIC SCIENCES > AQUACULTURE

AGRICULTURE > AGRICULTURAL AQUATIC SCIENCES > FISHERIES

ISO Topic Category

FARMING

BIOTA

Project

EOSDIS > Earth Observing System Data Information System

ESIP > Earth Science Information Partners Program

CESIC > Compendium of Environmental Sustainability Indicators Collections

Access Constraints None

Use Constraints The Trustees of Columbia University hold the copyright of this dataset. Users are prohibited from any commercial sale or free redistribution without explicit written permission from CIESIN. Users should acknowledge CIESIN as the source used in the creation of any reports, publications, new datasets, derived products, or services resulting from the use of this dataset. CIESIN also requests reprints of any publications and notification of any redistributing efforts.

Ancillary Keywords

CIESIN > Agriculture and Food Security > Agricultural Production > Water Resources

CIESIN > Agriculture and Food Security > Nutrients

Data Set Progress

COMPLETE

Originating Center

SEDAC

Data Center

Socioeconomic Data and Applications Center

Data Center URL: http://sedac.ciesin.columbia.edu/
Dataset ID: CIESIN_SEDAC_CESIC_COMPLETE_V11

Data Center Personnel
Name: SEDAC USER SERVICES Phone: +1 845-365-8920 Fax: +1 845-365-8922 Email: ciesin.info at ciesin.columbia.edu Contact Address: 61 Route 9W, P.O. Box 1000 City: Palisades Province or State: NY Postal Code: 10964 Country: USA

World Data Center for Human Interactions in the Environment

Data Center URL: http://sedac.ciesin.columbia.edu/wdc/
Dataset ID: CIESIN_SEDAC_CESIC_COMPLETE_V11

Data Center Personnel
Name: ROBERT CHEN Phone: 1-845-365-8952 Fax: 1-845-365-8922 Email: bchen at ciesin.columbia.edu Contact Address: WDC for Human Interactions in the Environment CIESIN/Columbia University P. O. Box 1000 61 Route 9W City: Palisades Province or State: NY Postal Code: 10964 Country: USA

Distribution

Distribution Media: Online Internet (HTTP)

Distribution Size: 0.5 MB

Distribution Format: CSV

Fees: 0

Personnel

SEDAC USER SERVICES

Role: TECHNICAL CONTACT

Phone: +1 845-365-8920

Fax: +1 845-365-8922

Email: ciesin.info at ciesin.columbia.edu

Contact Address:

61 Route 9W, P.O. Box 1000

City: Palisades

Province or State: NY

Postal Code: 10964

Country: USA

CIESIN METADATA ADMINISTRATION

Role: DIF AUTHOR

Phone: +1 845-365-8988

Fax: +1 845-365-8922

Email: metadata at ciesin.columbia.edu

Contact Address:

61 Route 9W, P.O. Box 1000

City: Palisades

Province or State: New York

Postal Code: 10964

Country: USA

Publications/References

Global Footprint Network (GFN) (2006), Compendium of Environmental Sustainability Indicator Collections: 2006 National Footprint Accounts, Global Footprint Network (GFN), Oakland, CA, http://sedac.ciesin.columbia.edu/data/set/cesic-national-footprint-...