Article Index

Survey locations and methods

The survey focused on groups that are most at risk from threatening processes affecting the mainland, such as the arrival of the cane toad, and late dry season extensive and  intense wildfires. As it is impossible to sample everything on the islands, this survey  focused on:

  • mammals
  • reptiles
  • frogs
  • land snails
  • Long_Is
    Long Island. Photo © Frank Kohler
  • birds
  • plants

The survey employed a variety of detection techniques including:

  • aluminium box (Elliott) and cage traps (mainly for mammals)
  • funnel traps (reptiles particularly snakes)
  • spotlighting (mammals and reptiles)
  • active searching (reptiles and snails)
  • call recognition (bats, birds and frogs)
  • quadrats (plants) and
  • opportunistic observations (all).

Thirty one sites on pdf24 islands were sampled over four dry and three wet seasons from 2007 to 2010. Small research teams made up of scientists and traditional owners were transferred to the islands by helicopter or boat (in wet season). Logistical operations were coordinated at a base camp on the mainland.

The islands selected for survey include:

Island Area (ha) Island Area (ha)
Adolphus 4134 Augustus 18 929
Bigge 17 108 Boongaree 4164
Byam Martin 816 Coronation 3791
Hidden 1871 Jungulu 4803
Katers 1713 Kingfisher 300
Lachlan 1150 Long 1125
Mary 847 Middle Osborn 2378
NW Molema 592 Sir Graham Moore 2812
South West Osborn 1340 St Andrew 1465
Storr 1883 Sunday 1186
Un-named (west of Storr) 897 Uwins 3219
Wargul Wargul 626 Wulalam 415