University of Guilan Caspian Journal of Environmental Sciences 1735-3033 13 4 2015 12 01 First record of Limnodrilus claparedeianus Ratzel, 1868 (Annelida: Oligochaeta: Tubificidae) in Anzali Wetland, Guilan province, Iran 407 416 1591 EN F. Nazarhaghighi Islamic Azad University Science and Research Branch of Tehran R. Mousavi Nadoushan Islamic Azad University North branch of Tehran N. Shabanipour University of Guilan M.R. Fatemi Islamic Azad University Science and Research Branch of Tehran A. Mashinchian Moradi Islamic Azad University Science and Research Branch of Tehran, Journal Article 2014 12 30 Oligochaeta worms are important organisms in aquatic ecosystem. Their omnipresence makes them as an indicator of environmental changes and health of aquatic ecosystem. The members of the family Tubificidae and in particular, genus Limnodrilus are considered as the most tolerant oligochaets to aquatic pollution. Therefore identification and biological characteristics of this taxon are of great help to evaluate the ecosystem of water bodies. Limnodrilus claparedeianus were collected from Anzali Wetland with a grab of 0.04 m2 capacity at 13 stations from August 2012 through June 2013. Penis sheath was one of the main characteristics to identify them. Results showed their maximum and the minimum density in spring (601.27± 466.8346 Ind.m-2) and in autumn (156.12 ±136.3Ind.m-2) respectively which was significantly different (P<0.05). Comparative spatial distribution of L. claparedeianus among 13 stations revealed significant differences in the west stations (P<0.05). According to the results, correlation analysis did not exhibit any relation between abundance of L. claparedeianus and total organic matter, abundance of the species and percentage of silt in substrate sediment.

https://cjes.guilan.ac.ir/article_1591_0150a490de481e9d80ec2ef75e304318.pdf