title: Benthic polychaetes in the Ratnagiri bay, India: influence of anthropogenic factors.
abstract: Study of changes in macrobenthic community structure is an intrinsic part of many environmental monitoring programmes. Hence, it is pivotal to distinguish the effects of natural and anthropogenic factors on these sensitive organisms for accurate assessment and management of coastal environment. Polychaete species diversity of five stations in the Ratnagiri bay was investigated during premonsoon and postmonsoon months in 2007. Though no spatial trends in polychaete diversity vis-à-vis the pollution was visible, the polychaete univariate indices were uniformily better in premonsoon indicating clear seasonal trends. Shannon diversity values ranged from 1.4-2.4 during premonsoon and 0.6-1.6 during postmonsoon. Station 5, which was most impacted by anthropogenic wastes as demonstrated by the anoxic conditions coupled with higher nutrient load, had comparatively higher H' values (1.9 and 1.6) and better evenness values (0.9 and 0.7) during both seasons indicating that the polychaetes were not influenced by anthropogenic contamination. The study indicates that the polychaete distribution and diversity in the bay were governed primarily by variations in sediment texture rather than the anthropogenic disturbances.
authors.affiliation: Regional Centre, National Institute of Oceanography, Andheri (W), Mumbai, 400 053, India. soniya@nio.org
authors.forename: Soniya
authors.initials: S
authors.lastname: Sukumaran
authors.forename: Kanchan
authors.initials: K
authors.lastname: Bhokepode
authors.forename: Madhavi
authors.initials: M
authors.lastname: Telavane
authors.forename: Priti
authors.initials: P
authors.lastname: Kubal
authors.forename: S N
authors.initials: SN
authors.lastname: Gajbhiye
mesh_terms: D000818:Animals; D017753:Ecosystem; D019015:Geologic Sediments; D006802:Human Activities; D007194:India; D009792:Oceans and Seas; D011077:Polychaeta / Q000187:drug effects* / Q000502:physiology*; D012621:Seasons; D012623:Seawater / Q000737:chemistry; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000633:toxicity*; D014877:Water Pollution, Chemical / Q000009:adverse effects / Q000032:analysis
chemical_list: D014874:Water Pollutants, Chemical