Zieria granulata (Illawarra Zieria) Recovery Plan

NSW Department of Environment and Conservation, 2005
ISBN: 1 7412 2143 9

Executive Summary

This document constitutes the formal Commonwealth and New South Wales State Recovery Plan for Zieria granulata (Illawarra Zieria), and as such considers the conservation requirements of the species across its known range. It identifies the future actions to be taken to ensure the long-term viability of Z. granulata in nature and the parties who will carry out these actions.

Zieria granulata is listed as endangered on the Commonwealth Environment Protection and Biodiversity Conservation Act 1999 and as endangered on Schedule 1 of the NSW Threatened Species Conservation Act 1995. It is a tall shrub or small tree (family Rutaceae) that is endemic to the Illawarra region of NSW where it is recorded from 26 populations (97 highly fragmented sites) within a range of approximately 22 kilometres. The total population size of the species is estimated to be approximately 8000 mature individuals.

Z. granulata typically occupies dry ridge tops and rocky outcrops on shallow volcanic soils, although it has been recorded in a range of habitats. Vegetation types typically associated with the species include subtropical rainforest, Melaleuca armillaris (Bracelet Honey-myrtle) scrub to tall shrubland, and Eucalyptus tereticornis (Forest Red Gum) open forest. The species is less frequently recorded in a number of other vegetation types.

Extensive clearing of the Illawarra lowlands since European settlement has destroyed much of the natural habitat of Z. granulata and much of the remaining habitat is highly fragmented. The majority of Z. granulata sites are small, isolated and occupy freehold land that may be subject to competing landuses. The main threat to the species is the further loss of habitat as a consequence of agricultural clearing, quarrying, residential development and road construction. Agricultural activities (including grazing and trampling by livestock, vegetation slashing, and herbicide spraying), roadside and dry stone wall maintenance activities, weed invasion and rubbish dumping also threaten Z. granulata at a number of sites.

The overall objective of this recovery plan is to provide for the continued and long-term survival of Zieria granulata in the wild by promoting the in-situ conservation of the species across its natural range. The specific recovery objectives are:

  • To conserve Z. granulata using land-use and conservation planning mechanisms;
  • To identify and manage the threats operating at sites that contain the species;
  • o provide the community with information that assists in conserving the species;
  • To raise awareness of the species and involve the community in the recovery program;
  • To promote research that will assist with the management of the species; and
  • To coordinate an ex-situ conservation program to safeguard genetic material from extinction.

It is intended that this recovery plan will be implemented over a five year period. The total cost to implement the plan is $83,150, although this does not include site management costs or the costs associated with the preparation and implementation of management plans for roadside sites and sites that are located on community land, as these costs are yet to be determined.

Lisa Corbyn
Director General

Bob Debus MP
Minister for the Environment