Charles Darwin University

CDU eSpace
Institutional Repository

 
CDU Staff and Student only
 

Spatial ecology, genetic barcoding, and vulnerability of tropical Indo-West Pacific batoids, with a focus on Australian species

Cerutti-Pereyra, Florencia (2012). Spatial ecology, genetic barcoding, and vulnerability of tropical Indo-West Pacific batoids, with a focus on Australian species. Doctor of Philosophy Thesis, Charles Darwin University.

Document type: Thesis
Citation counts: Google Scholar Search Google Scholar
Attached Files (Some files may be inaccessible until you login with your CDU eSpace credentials)
Name Description MIMEType Size Downloads
Download this reading Thesis_CDU_62340_Cerutti_Pereyra_F.pdf PDF version generated by student application/pdf 8.96MB 2
Reading the attached file works best in Firefox, Chrome and IE 9 or later.

Author Cerutti-Pereyra, Florencia
Title Spatial ecology, genetic barcoding, and vulnerability of tropical Indo-West Pacific batoids, with a focus on Australian species
Institution Charles Darwin University
Publication Date 2012-07-06
Thesis Type Doctor of Philosophy
Supervisor Austin, Christopher M.
Subjects 0602 - Ecology
Abstract Tropical batoids are abundant and important members of coral reef fish communities. Their populations are subject to intense pressure from fishing and habitat degradation, but due to their distinct life-history traits, can only withstand modest levels of decline without stock collapse. Despite this, basic knowledge to ensure their effective conservation and management is lacking. This project addressed this need by combining several current and innovative research tools to assist the integrated management of batoids in northern Australia (NA) and the Indo-West Pacific (IWP).

DNA-barcoding was used to confirm the identification of 16 batoid species at Ningaloo Reef (NRMP), Western Australia. It demonstrated its potential to confirm field identifications where taxonomic uncertainty might confound ecological data, although two major sets of problems limiting its application were also identified.

Passive acoustic monitoring was used to study the spatial ecology of batoids in the lagoon of NRMP. By using acoustic receivers, the first confirmed nursery area for tropical juvenile batoids in the IWP was identified - a shallow embayment that recorded most of the detections. Adult rays showed sexual segregation of core areas of activity inside the lagoon, with juvenile and adult rays, moving beyond protected areas. Little evidence of habitat partitioning among species was found at large spatial scales, despite differential use of microhabitats. The current zoning of the NRMP provides effective protection for core areas of
activity but not for larger movement ranges. As such, spatial management will require large areas of protection to ensure the conservation of these species.

An ecological risk assessment (ERA) was employed to assess the vulnerability of tropical batoids to the risk of fishing and habitat degradation in NA and IWP. The ERA methodology was also used to identify and rank research gaps and priorities. Finally, the applicability of these tools, and findings, to the conservation and integrated management of tropical batoids in NA and the IWP, and future research directions, are discussed.
Keyword Batoids
tropical rays
barcoding
risk assessment
Indo-West Pacific
elasmobranchs
marine protected areas


© copyright

Every reasonable effort has been made to ensure that permission has been obtained for items included in CDU eSpace. If you believe that your rights have been infringed by this repository, please contact digitisation@cdu.edu.au.

 
Versions
Version Filter Type
Access Statistics: 10 Abstract Views, 2 File Downloads  -  Detailed Statistics
Created: Thu, 07 Feb 2019, 12:31:24 CST by Jessie Ng