Fig 1.
Study area and position of sampling stations.
Shaded region denotes the limits of the Malvan Marine Sanctuary.
Fig 2.
Timeline showing six sampling periods, nomenclature and classification.
Fig 3.
Sediment composition and Organic Carbon at the four stations during the 6 sampling occasions Premonsoon 2007, Postmonsoon 2007, Phyan 2009, Monsoon 2011, Postmonsoon 2011 and Premonsoon 2012.
Table 1.
Chemical parameters across study periods.
Fig 4.
Univariate analyses using polychaete density at the four stations during the 6 sampling occasions: Premonsoon 2007, Postmonsoon 2007, Phyan 2009, Monsoon 2011, Postmonsoon 2011 and Premonsoon 2012.
Shaded region denotes sampling immediately after Phyan.
Table 2.
Major species (contribution~ 80%) at outer and bay stations during each sampling event.
Numbers in parenthesis indicate species percentage composition to the nearest integer.
Fig 5.
Non-metric MDS ordination of polychaete assemblages at the four stations during the 6 sampling occasions; Premonsoon 2007, Postmonsoon 2007, Phyan 2009, Monsoon 2011, Postmonsoon 2011and Premonsoon 2012.
Fig 6.
Composition of feeding guilds at the four stations during the 6 sampling occasions: Premonsoon 2007, Postmonsoon 2007, Phyan 2009, Monsoon 2011, Postmonsoon 2011 and Premonsoon 2012.
Fig 7.
Canonical correspondence analyses triplot of 17 most abundant polychaete species and 7 explanatory variables at the four stations during the 6 sampling occasions; Premonsoon 2007, Postmonsoon 2007, Phyan 2009, Monsoon 2011, Postmonsoon 2011 and Premonsoon 2012.
●:stations; →:environmental variables; Sand; Silt; Clay; Corg; Salinity; DO; pH; Δ:Polychaete species;; Agl dib: Aglaophamusdibranchis; Eun pen: Eunice pennata; Nin sp: Ninoesp; Aon cir: Aonidellacirrobranchiata; Parsp: Paraprionospiosp; Par pat: Paraprionospiopatiens; Het sp: Heterospiosp; Mag cin: Magelonacincta; Cirsp: Cirratulussp.; Scouni: Scoloplosuniramus; Sco arm: Scoloplos armiger; Cos coa: Cossuracoasta; Cap: Capitellidae (gen. sp.); Mal: Maldanidae (gen. sp.); Stescu: Sternaspisscutata; Sab lon: Sabellastarte longa; Nov ban: Novafabriciabansei. General groupings of stations and species are indicated. Shaded stations are Phyan impacted).
Table 3.
Spearman’s Rank correlation between univariate indices, trophic groups and environmental variables.
Table 4.
Summary of the results of CCA analysis.