Predictive modeling of cetacean densities in the California current ecosystem based on summer/fall ship surveys in 1991-208

Becker, Elizabeth A. (Elizabeth Ann); Forney, Karin A.; Ferguson, Megan Caton; Barlow, Jay; Redfern, Jessica Veneris

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Predictive modeling of cetacean densities in the California current ecosystem based on summer/fall ship surveys in 1991-208

2012
By Becker, Elizabeth A. (Elizabeth Ann) ; Forney, Karin A. ; Ferguson, Megan Caton ; ...
Series: NOAA technical memorandum NMFS

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Personal Author:

Becker, Elizabeth A. (Elizabeth Ann) ; Forney, Karin A. ; Ferguson, Megan Caton ; Barlow, Jay ; Redfern, Jessica Veneris

Becker, Elizabeth A. (Elizabeth Ann) ; Forney, Karin A. ; Ferguson, Megan Caton ; Barlow, Jay ; Redfern, Jessica Veneris Less -
Corporate Authors:

Southwest Fisheries Science Center (U.S.)
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center) Less -
Description:

"We use data from six ship-based cetacean and ecosystem assessment surveys in the California Current Ecosystem (CCE) to update habitat-based density models for 11 species and one small-beaked-whale guild. We previously had modeled cetacean density as a function of oceanic variables for the same 12 species/guild using data collected during four line-transect ship surveys conducted in the CCE in summer and fall of 1991, 1993, 1996, and 2001. An independent set of survey data collected in the summer and fall of 2005 was used to validate the models. These estimates were incorporated into a web-based system that allows users to estimate cetacean density within any user-defined region within the CCE study area. In this study, data from an additional line-transect survey conducted in 2008 were pooled with the 1991-2005 data and used to re-build the habitat-based density models. We also refit the 1991-2008 data to the previous 'best' models to compare model performance. The additional year of data provided increased sample sizes and a greater range of oceanic conditions for robust model development. Predicted densities for each year were smoothed and then averaged to produce a composite grid that represents our best estimate of CCE cetacean density over the past 20 years. The final model predictions were used to update the web-based system and also provided to the U.S. Navy to help assess potential impacts from their at-sea training and testing activities"--Abstract.
Content Notes:

Elizabeth A. Becker, Karin A. Forney, Megan C. Ferguson, Jay Barlow, Jessica V. Redfern.

"October 2012."

System requirements: Adobe Acrobat Reader.

Includes bibliographical references (pages 11-14).
Keywords:

[+]

Cetacea Cetacea Populations Estimates Fish Surveys Geographical Distribution Marine Mammal Populations Mathematical Models
Series:

NOAA technical memorandum NMFS ; NOAA-TM-NMFS-SWFSC ; 499

NOAA technical memorandum NMFS ; NOAA-TM-NMFS-SWFSC ; 499 Less -
Document Type:

Technical Memorandum
Place as Subject:

California ; Pacific Coast

California ; Pacific Coast Less -
Rights Information:

Public Domain
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Library
Main Document Checksum:

[+]

urn:sha256:07def017c69d980f400fc7b6ada2aee597b0e274cd3a9748e077ccf179a7b7a8
Download URL:

https://repository.library.noaa.gov/view/noaa/4470/noaa_4470_DS1.pdf
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Predictive modeling of cetacean densities in the California current ecosystem based on summer/fall ship surveys in 1991-208

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