Bivalves and Gastropods of the Gulf of Tehuantepec, Mexico: A Checklist of Species with Notes on Their Habitat and Local Distribution (original) (raw)
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Distribution Patterns Of Gastropods And Bivalves At The Yucatan Peninsula, Mexico
Ciencias Marinas, 1991
Records of 298 molluscs species (99 bivalves and 199 gastropods) from 33 localities along the shoreline and the corals reef of the Yucatán peninsula, were analized in terms of their geographic range of the information content and species richness. Coral reef areas showed to have the highest species richness. The families with the highest species numbers were Tellinidae, Arcidae, Mytilidae and Lucinidae for lamellibranchs, whilst the families Fissurellidae and Muricidae showed the highest species richness among the gastropods. Four areas were defined according to the distribution patterns of the species found: west coast, north coast, east coast and coral reef areas. The most distinctly defined area was the east coast, mostly due to its gastropod fauna. Finally, 16 geographic distribution patterns were found, from which the one whose elements range from the Caribbean Province to the Brazilian Province hold the highest species richness, whilst the elements of the Caribbean Province co...
We describe the composition and distribution of bivalve molluscs from the sandy and rocky intertidal and the shallow subtidal environments of Bahía de Mazatlán, México. The bivalve fauna of the bay is represented by 89 living species in 28 families, including 37 new records and four range extensions: Lithophaga hastasia, Adula soleniformis, Mactrellona subalata, and Strigilla ervilia. The number of species increases from the upper (44) and lower intertidal (53) to the shallow subtidal (76), but only 11 (17%) have a wide distribution in the bay (i.e., found in all sampling sites and environments). The bivalve assemblages are composed of four main life forms: 27 epifaunal species, 26 infaunal, 16 semi-infaunal, and 20 endolithic. A taxonomic distinctness analysis identified the sampling sites and environments that contribute the most to the taxonomic diversity (species to suborder categories) of the bay. The present work increased significantly (31%) to 132 species previous inventories of bivalves of Bahía de Mazatlán. These species represent 34% of the bivalve diversity of the southern Golfo de California and approximately 15% of the Eastern Tropical Pacific region.
The vertical distribution and abundance of conspicuous gastropod and bivalve species were studied at five rocky beaches in Cuastecomate Bay, Jalisco. Sampling was done from September, 1993 through March, 1994 with 0.75 m2 quadrants placed along replicate transect lines (10 m long) in the supralittoral and mesolittoral (upper, middle and lower intertidal) zones. A total of 6 643 mollusks were collected. Gastropods dominated the samples (6 272 individuals, 44 species); the bivalves were less abundant and diverse (371 individuals, five species). Seventeen species comprised 89.8% of all individuals collected. The gastropods Nodilittorina aspera and Nerita scabricosta were the most abundant with 637.8 and 71.43 individuals/m2, respectively. The most abundant bivalves were Brachidontes adamsianus and Chloromytilus palliopunctatus with 60.7 and 61.3 individuals/m2 respectively. The abundance of gastropods decreased from the supralittoral to the lower tidal zones while the number of species increased in the same direction. The number of species of bivalves also increased from the supralittoral to the lower intertidal zone; the abundance of individuals was higher at the middle intertidal zone. Affinities between groups of species among sampling stations were identified by computing Pearson's correlation coefficient using abundance values (ind./m2) and Jaccard's dissimilarity index using species presence or absence in the lower intertidal zone. Affinity among stations was not dependent upon their vicinity but on the high dominance of few species, the occurrence of many secondary species and beach characteristics.
Ciencias Marinas, 1998
This study examines the distribution and abundance with respect to depth and type of substratum of 86 gastropod species collected from the Pacific continental shelf off Jalisco and Colima, Mexico, in August 1988. Sampling was performed with a trawl net at 22 stations, at depths of 18 to 112 m. A total of 582 individuals pertaining to 42 genera, 25 families, 4 orders and 3 subclasses of gastropods were collected. Abundance of gastropods was similar between 18 and 83 m, but the number of live individuals decreased between 41 and 60 m. Deep (61-83 m) stations registered the lowest diversity; however, the number of species collected alive decreased with depth. No gastropods were collected at stations deeper than 83 m. The number of individuals and species also varied with the type of substratum. Greater heterogeneity of the sediments was found at the shallower stations (18860 m) with medium sand, sandy silt and silty clay substrata. The greatest number of species were collected at stati...
Bivalvia (Mollusca) of the Gulf of Mexico
The molluscan class Bivalvia includes mussels, oysters, scallops, and clams. Named for the characteristic twoshelled valves that enclose soft parts of the animal, bivalves are an important part of the benthic infauna and epifauna of the Gulf of Mexico. They can be found from the head of tide to the deepest abyss, attached to rocks and shells, buried in the mud and sand, crawling on seagrass blades, and burrowing in wood and coral rock. These animals serve important ecological roles in estuaries and other shallow waters as filter feeders that ingest what is in the water and egest processed materials to the substrate. Bivalve burrowing species turn over shallow sands, silts, and mud, aerating the topmost substratum. Boring bivalves break down coral rock and wooden materials, forming crevices for other species to inhabit. The shipworms, a highly modified group of bivalves, are agents for decomposing organic materials in seawater (e.g., trees and wooden debris) but are considered pests by many coastal residents because they burrow into and destroy wooden pilings and other structures, causing millions of dollars of damage. Scallops, oysters, mussels, and clams have great commercial value and are featured fare in many Gulf restaurants. Most bivalves are free living, although a few are parasitic. Life cycles most often include planktonic larvae.
Bivalve Molluscs from the Continental Shelf of Jalisco and Colima, Mexican Central Pacific
American Malacological Bulletin, 2008
A survey for bivalves was conducted at 25 sampling stations on the Mexican Central Pacific shelf off Jalisco and Colima, during the summer of 1988. The bivalves were sampled with a Van Veen grab at 16 stations with medium sand, sandy silt, and silty clay substrata at depths between 18 and 112 m. A total of 5,196 individuals belonging to 59 genera and 95 species of bivalves were found. A systematic list is provided with the relative abundance and density (individuals/m 2 ) for each species and information on depth, type of substratum, bottom water temperature, and oxygen concentration for each station. The twelve most common species (>100 individuals/station) in descending order of abundance were: The bathymetric patterns in the abundance and species composition of the bivalve community and their relationship to environmental parameters are discussed. The structure of the assemblages differed with depth, with peak abundances and species richness (1) between 24 and 40 m with medium sand and sandy silt substrata and (2) at intermediate depths between 71 and 74 m, with sandy silt and silty clay substrata. The species characterizing shallow, intermediate, and deep zones were the most abundant or those exclusive of each zone. Diversity, dominance, and evenness decreased at the deeper stations. The distinctive species composition of these zones may be the result of variation in depth, oxygen concentration, and substratum.
Biodiversity Data Journal, 2016
Background During the TALUD XV research cruise off the southern part of the Baja California Peninsula, Mexico, samples of macro-invertebrates obtained in the deep-sea (296-2136 m) revealed a rich fauna of bivalves (17 species belonging to 10 families). The number of species per station varied from one to five. The richest families were Nuculidae, Nuculanidae, Neilonellidae, Limidae, and Cuspidariidae. Solemyidae, Lucinidae, Poromyidae, Verticordiidae, and Pectinidae were each represented by a single species. Some species groups need a thorough revision and were tentatively identified (Nuculana cf. hamata, Limatula cf. saturna).
Additional Gastropod Records from the Continental Shelf Off Jalisco and Colima, Mexico
Ciencias …, 1996
This study reports the tirst record of 17 species of gastropods collected on the continental shelf off Jalisco and Colima, Mexico, in August 1988. Samples were taken with a Van Veen grab and net trawls at depths between 40 and 98 m. Substrates consisted of medium sand, sandy silt and silty clay. Previous range distributions of eight species (Cosmiconcha rehderi, Cyclostremiscus planospira, Knefastia howelli, Kurtzia elenensis, Leptadrillia fìrmichorda, Mirachelus galapagensis, Nassarina perata and Phos fusoides) included localities between Guerrero, Mexico, and Ecuador. Previous records of the other nine species (Parvanachis albodonosa, Atilliosa carmen, Knefastia walkeri, Kylix paziana, Mitrella dorma, M. xenia, Strombina solidula, Sulcoretusa paziana and Turritela anactor) included localities in the Gulf of California, Sinaloa and Nayarit, Mexico. These species belong to two subclasses, four orders, eight families and tifteen genera of gastropods. Information on abundarme, distribution with respect to depth and type of substratum and range distribution is also provided
The culmination of an eight year study, it treats all bivalve mollusks living from northern Baja California, México to northern Perú. A total of 890 species are described and illustrated with detailed color photographs and drawings. All habitats in the region are included from the intertidal splash zone to the abyssal depths of the ocean basins. The book has over 6,000 complete bibliographic references to the bivalves including citations on the biology, physiology, ecology, and taxonomy of this commercially and biologically important group. Character tables and dichotomous keys assist the reader in identification. Also included in the 1400 page book is an illustrated key to the superfamiles of the region, and a complete glossary.
Species richness and biogeographical affinities of the marine molluscs from Bahía de Chamela, Mexico
Biodiversity Data Journal, 2020
For more than 10 years (2007-2018), the benthic macroinvertebrates of Bahía de Chamela (Mexican Pacific) were sampled at 31 sites (0-25 m depth). A total of 308 species of the five main classes of benthic molluscs were obtained (106 bivalves, 185 gastropods, 13 polyplacophorans, two scaphopods and two cephalopods). This is a significant increase in the number of species (246 new records) compared to the 62 species previously recorded more than 10 years ago. The distribution in the 31 localities of the bay is given for the first time for most of the species, together with information on its ecological rarity (incidence in the samples). Two families of bivalves (Veneridae and Mytilidae) and three families of gastropods (Calyptraeidae, Muricidae and Collumbellidae) comprised ~ 30% of all species. Ecological rarity was evident with 45 families (45.0%) with only one species and 178 species (57.8%) collected in one site and 67 (21.8%) in two sites. The molluscs of Bahía de Chamela represe...