Temporal and spatial distribution of Thaliacea of the Urochordata around Hormuz Island, the Persian Gulf

Authors

Abstract

The class Thaliacea belongs to Urochordata which branched from phylum chordata.
Thaliacea have three orders: Doliolida (Cyclomyaria), Pyrosomatida and Salpida
(Desmomyaria) and all are considered marine plankton, holoplankton and microphages. These
animals feed by filtering water through their body. The aim of this research was to identify
and study the ecological processes of the tunicates in coastal waters of the Hormuz Island in
the Persian Gulf. We sampled water in an annual basis, starting from July 2007 and
terminating in May 2008. Periodic sampling (Every 40 days) was applied and the use of
plankton net with mesh size 300μm made it possible to collect plankton samples from four
localities (south, north, east, west) of the Island each having two stations, one in the vicinity
of the coastal waters and another away at about 2.5 miles. We found 4 species of Thaliacea:
Doliolum denticulatum, Doliolum nationalis, Thalia democratica, Salpa cylindrica. In
addition, we observed a life stage of Doliolum. The highest frequency was observed in May
and in the south station. There was significant correlation between abundance of Doliolum
denticulatum and its late oozoid or old nurse and between Thalia democratica and Doliolum
denticulatum.
*Corresponding author

Keywords

Iranian Scientific Fisheries Journal
Volume 20, Issue 2
March and April 2011
Pages 159-166

Files

Share

How to cite

Statistics