Estimation of density of dolphin schools in the eastern tropical Pacific using line transect methods
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields



Publication Date Range:


Document Data


Document Type:






Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page


Estimation of density of dolphin schools in the eastern tropical Pacific using line transect methods

Filetype[PDF-23.08 MB]

Select the Download button to view the document
This document is over 5mb in size and cannot be previewed


  • Personal Author:
  • Description:
    Aerial and research ship surveys were conducted from 1977 through 1983 to provide data to estimate density of dolphin schools in the eastern tropical Pacific. Line transect theory was used to compute estimates. Several assumptions of line transect theory were investigated for both aerial and ship data. Correction factors were developed to help accommodate violations of the assumptions. Estimates are presented for data stratified into an inshore area surveyed by planes and an offshore area surveyed by ships. These estimates were combined to determined density for the entire area. Densities for the inshore, offshore and all areas were 4.18, 2.04, and 2.71 schools/1000 km*2 , respectively. Maximum adjustments for possible biases due to adverse sea state and sun glare conditions increased the inshore estimate by 76% and the offshore estimate by 64%; however, these adjustments were based upon assumptions which were likely violated.
  • Document Type:
  • Place as Subject:
  • Rights Information:
    Public Domain
  • Compliance:
  • Main Document Checksum:
  • File Type:

Supporting Files

  • No Additional Files

More +

You May Also Like

Checkout today's featured content at

Version 3.21