Dataset: Patterns of abundance and size of dictyoceratid sponges among neighbouring islands in central Torres Strait (CRC-TS Project: Task Number T1.6a)


Description

In December 2004, and September and December 2005, surveys for dictyoceratid sponges were conducted around six neighbouring islands in central Torres Strait: Kabbikane, Keats, Kodall, Marsden, Masig and Rennel. Most islands were <10 km apart, with distances ranging from 3 to 17 km. Four sites were surveyed at each island, with sites at least 1 km apart. At each site, dictyoceratids were surveyed at both shallow (4 to 6 m) and deep (10 to 15 m) depths, with the former generally on the reef flat. Three 20×1 m transects were examined at each depth, with transects separated by at least 20 m.Size-frequency distribution patterns for each species was determined by measuring the greatest dimension of every dictyoceratid with a ruler. Specimens were grouped into five size classes: <5 cm, 5-10 cm, 10-20 cm, 20-50 cm and >50 cm.For each transect reef slope and the percentage of consolidated rock and rubble were recorded.\n This study was undertaken to quantify patterns of abundance and size of the more common dictyoceratid sponges among neighbouring islands in central Torres Strait, and thus to examine variation across small spatial scales. The study also investigated the importance of depth in structuring sponge distributions.\n

General Information

Distributions