Territory Stories

The Darwin Dolphin Monitoring Program : Abundance, Apparent Survival, Movements and Habitat Use of Humpback, Bottlenose and Snubfin Dolphins in the Darwin Area.

Details:

Title

The Darwin Dolphin Monitoring Program : Abundance, Apparent Survival, Movements and Habitat Use of Humpback, Bottlenose and Snubfin Dolphins in the Darwin Area.

Creator

Brooks, Lyndon; Pollock, Kenneth; Northern Territory. Department of Land Resource Management

Collection

E-Publications; E-Books; PublicationNT

Date

2015-10-28

Description

This report presents the results of a coastal dolphin monitoring program for the Ichthys LNG Project (the Project) in Darwin Harbour. The monitoring program comprised a capture-recapture study and a spatial habitat use study on humpback, bottlenose and snubfin dolphins in Darwin Harbour and two adjacent sites, Bynoe Harbour to the west and Shoal Bay to the east (the sample area). Data were collected over a period of three and a half years (October 2011 to April 2015) in a systematic and intensive sampling program consisting of eight twice-yearly sampling sessions (dry and wet season samples), each of approximately three weeks duration (primary samples). The capture-recapture study, based on photographic identification of individuals, yielded estimates of abundance, apparent survival and movements by site and over time. The spatial habitat use study, based on group detections, yielded estimates of variation in use of the sample area in terms of locations and over time.

Notes

Made available via the Publications (Legal Deposit) Act 2004 (NT)

Language

English

Subject

Dolphins -- Northern Territory -- Ecology; Biodiversity conservation -- Northern Territory

Publisher name

Northern Territory Government

Place of publication

Palmerston

Format

iv, 51 pages : colour map ; 30 cm.

File type

application/pdf

ISBN

9781743501023

Use

Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government

License

https://creativecommons.org/licenses/by/4.0/

Parent handle

https://hdl.handle.net/10070/262099

Citation address

https://hdl.handle.net/10070/484684

Page content

The Darwin Dolphin Monitoring Program iv FIGURES Figure 1 Three dorsal fin images of one dolphin from each species collected in different years ............................................................................................................................ 7 Figure 2 Map of transect lines overlaid on grid cells in Bynoe Harbour, Darwin Harbour and Shoal Bay showing sets of cells grouped to compose ten locations ............................. 9 Figure 3 Humpback dolphin: Estimated total number of dolphins present in each primary sample with 95% confidence interval (CRD model all sites combined) .................... 19 Figure 4 Humpback dolphin: Estimated number of dolphins present on each site during the eight primary samples with 95% confidence intervals ................................................ 24 Figure 5 All dolphins: Mean group detection rate estimated at mean effort by location and primary sample .......................................................................................................... 38 Figure 6 All dolphins: Mean group detection rate estimated at mean effort by location ........ 40 Figure 7 Humpback dolphin: Mean group detection rate estimated at mean effort by location and primary sample ................................................................................................... 41 Figure 8 Humpback dolphin: Mean group detection rate estimated at mean effort by location .................................................................................................................................. 42 Figure 9 Bottlenose dolphin: Mean group detection rate estimated at mean effort by location .................................................................................................................................. 45 Figure 10 Snubfin dolphin: Mean group detection rate estimated at mean effort by location 46


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