title: Assessment of benthic changes during 20 years of monitoring the Mexican Salina Cruz Bay.
abstract: In this work a non-parametric multivariate analysis was used to assess the impact of metals and organic compounds in the macro infaunal component of the mollusks benthic community using surface sediment data from several monitoring programs collected over 20 years in Salina Cruz Bay, Mexico. The data for benthic mollusks community characteristics (richness, abundance and diversity) were linked to multivariate environmental patterns, using the Alternating Conditional Expectations method to correlate the biological measurements of the mollusk community with the physicochemical properties of water and sediments. Mollusks community variation is related to environmental characteristics as well as lead content. Surface deposit feeders are increasing their relative density, while subsurface deposit feeders are decreasing with respect to time, these last are expected to be more related with sediment and more affected then by its quality. However gastropods with predatory carnivore as well as chemosymbiotic deposit feeder bivalves have maintained their relative densities along time.
authors.affiliation: Instituto Mexicano del Petróleo, Dirección de Seguridad y Medio Ambiente, Eje Central Lázaro Cárdenas No. 152, San Bartolo Atepehuacan, México, D.F. 07730, Mexico.
authors.forename: C
authors.initials: C
authors.lastname: González-Macías
authors.forename: I
authors.initials: I
authors.lastname: Schifter
authors.forename: D B
authors.initials: DB
authors.lastname: Lluch-Cota
authors.forename: L
authors.initials: L
authors.lastname: Méndez-Rodríguez
authors.forename: S
authors.initials: S
authors.lastname: Hernández-Vázquez
mesh_terms: D000818:Animals; D044822:Biodiversity; D017753:Ecosystem; D004784:Environmental Monitoring / Q000379:methods; D019015:Geologic Sediments / Q000737:chemistry; D007854:Lead / Q000032:analysis; D008800:Mexico; D008974:Mollusca; D012623:Seawater; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D014874:Water Pollutants, Chemical; D007854:Lead