eCommons

 

Whistle Production Rates in a Group of Bottlenose Dolphins (Tursiops Truncatus) among Changes in Group Composition in Sardinia, Italy

Other Titles

Abstract

This study focused on the whistle characteristics and production rates of a resident group of bottlenose dolphins (Tursiops truncatus) in Golfo Aranci, Sardinia, Italy. All recordings and observations were conducted at the local fish farm located 200 meters from the shore in Golfo Aranci. Three hundred and eighty minutes of underwater sounds were recorded using a single hydrophone system during the months of June and July 2007. Whistles were separated both according to group size and group composition for statistical analysis. The acoustic characteristics of 176 whistles were classified based on eight parameters and compared with data of previous studies. A significant positive correlation (r = 0.457, p ? 0.001) was observed between whistle rates and group size observed at the time of measurement, supporting our hypothesis that whistle rates increase in groups of larger numbers as compared to groups of smaller numbers. Additionally, whistle production rates of adults in the presence of an immature calf showed a significant difference to those of any other group (p ? 0.05) having a higher whistle production rate (median = 0.5 whistles/minute/individual), while all other groups were not significantly different in the production of whistles (p values > 0.05, median = 0 whistles/minute/individual). Whistles recorded at Golfo Aranci were of longer duration and higher maximum and minimum frequencies than previous studies. The results suggest that bottlenose dolphin whistle rates are affected by both group size and composition, with higher whistle rates in larger groups and in the presence of immature dolphins.

Journal / Series

Volume & Issue

Description

Sponsorship

Date Issued

2008-07-07T15:53:33Z

Publisher

Keywords

Location

Effective Date

Expiration Date

Sector

Employer

Union

Union Local

NAICS

Number of Workers

Committee Chair

Committee Co-Chair

Committee Member

Degree Discipline

Degree Name

Degree Level

Related Version

Related DOI

Related To

Related Part

Based on Related Item

Has Other Format(s)

Part of Related Item

Related To

Related Publication(s)

Link(s) to Related Publication(s)

References

Link(s) to Reference(s)

Previously Published As

Government Document

ISBN

ISMN

ISSN

Other Identifiers

Rights

Rights URI

Types

dissertation or thesis

Accessibility Feature

Accessibility Hazard

Accessibility Summary

Link(s) to Catalog Record