Diversity, Distribution and Composition of the Bivalvia Class on the Rocky Intertidal Zone of Marine Priority Region 32, Mexico

Abstract

The Bivalvia Class, is widely represented in marine ecosystems and is economically important; this research focused on this class and was carried out by sampling the rocky intertidal zone of seven sites located in the Marina Region Priority No. 32, Guerrero, Mexico, where the National Commission for the Knowledge and Use of Biodiversity reported lack of knowledge on marine species living there. The objectives were to examine species richness associated with the rocky intertidal zone, determine how the community is composed by the representation of families based on species richness and abundance, know the distribution of the species, analyze the structure sizes of populations and estimate the diversity index. Sampling was conducted at seven sites; the sampling unit was one square meter and the sampling area was 10 m 2 . 32 species were identified. Four species are new records for the Mexican Pacific Transitional: one for the state of Guerrero and one for Marine Priority Region 32. Arcidae and Mytilidae Families were better represented in species richness and Chamidae Family was the best represented in abundance. Chama coralloides was considered to be the representative species of the area; Striostrea prismatica showed the greatest size. The diversity index was estimated (H' = 3.65 bits/individuals). Species richness is high and corresponds to that expected in a tropical area.

The Bivalvia Class of rocky sites in Priority Marine Regions of Guerrero, Mexico: species richness, abundance, and distribution

“…Plicatula penicillata 1 México: Baja California (Bahía de los Ángeles), Baja California Sur (Santa Rosalía), Sonora (Guaymas y Bahía San Carlos), Sinaloa (Mazatlán), Jalisco, Guerrero (Isla la Roqueta y Acapulco) y Ecuador: Guayas (Santa Elena) (Keen, 1971;Villalpando, 1986;Skoglund, 2001;Coan & Valentich-Scott, 2012;Galeana-Rebolledo et al, 2012;Esqueda-González et al, 2014;Flores-Garza et al, 2014; DL; GIF; WMSDB y WoRMS)…”

“…Plicatulostrea anomioides 8 México: Baja California (Puertecitos), Sonora (Guaymas), Sinaloa (Mazatlán) Jalisco (Cuastecomate), Guerrero (Acapulco) y El Salvador: La Libertad (La Libertad) (Keen, 1971;Skoglund, 2001;Coan & Valentich-Scott, 2012;Esqueda-González et al, 2014;Galeana-Rebolledo et al, 2012;Flores-Garza et al, 2014; DL y WoRMS)…”

“…Brachidontes puntarenensis 74 México: Golfo de California, Sonora (Puerto Peñasco); Costa Rica: Puntarenas, Golfo de Nicoya; Ecuador: Isla Galapagos y Perú: Yasila (Piura) (Keen, 1971;Coan & Valentich-Scott, 2012;Galeana-Rebolledo et al, 2012;Torreblanca-Ramírez et al, 2012; Acar pusilla 72 México: Guerrero (Isla la Roqueta y Acapulco) y Chile (Villalpando, 1986;Galeana-Rebolledo et al, 2012;Flores-Garza et al, 2014 Skoglund, 2001;Flores-Rodríguez et al, 2003;Valdés-González et al, 2004;Flores-Rodríguez et al, 2007;Ortiz-Arellano & Flores-Campaña (2008); Coan & Valentich-Scott, 2012;Esqueda-González et al, 2014;Flores-Garza et al, 2014;Flores-Rodríguez et al, 2014 (Skoglund, 2001;Valdés-González et al, 2004;Barba-Marino et al, 2010;Coan & Valentich-Scott, 2012;Flores-Rodríguez et al, 2012;Esqueda-González et al, 2014;Flores-Garza et al, 2014;Galeana-Rebolledo et al, 2012;DL y WMSDB) Las Gatas…”

“…95 México: Baja California Sur (Bahía Magdalena), Golfo de California, Baja California (Isla Ángel de la Guarda), Sonora (Bahía San Carlos), Sinaloa (Mazatlán), Guerrero (Acapulco), Oaxaca (Puerto Escondido) y Perú: Piura (El Alto), La Libertad (Isla Guañape) (Keen, 1971, Skoglund, 2001Flores-Garza et al, 2010y 2011Coan & Valentich-Scott, 2012;Galeana-Rebolledo et al, 2012Torreblanca-Ramírez et al, 2012Esqueda-González et al, 2014;Flores-Garza et al, 2014;Flores-Rodríguez et al, 2014 (Keen, 1971;Skoglund, 2001;Landa-Jaime et al, 2007;Zamorano et al, 2008;Flores-Garza et al, 2010y 2011Coan & Valentich-Scott, 2012;Galeana-Rebolledo et al, 2012;Esqueda-González et al, 2014;Flores-Garza et al, 2014;DL;GIF;WMSDB y WoRMS) Ojo de Agua N = Número de ejemplares revisados por especialistas.…”

“…(Maeda-Martínez, 2008). Entre los datos recabados del Pacífico mexicano de sitios que no se localizan en el PTM y con los cuales se analizaron diversos aspectos de los bivalvos, se encuentran los de Reguero & García-Cubas (1988), León-Herrera (2000) y Esqueda-González et al (2014). En la ecorregión del PTM, los análisis de moluscos hacen referencia a la estructura, diversidad y variación de la comunidad en el tiempo (Holguín & González, 1989;Landa & Arciniega, 1998;Villarroel et al, 2000;Landa-Jaime et al, 2007;Flores-Rodríguez et al, 2012).…”