The Ecology of Adontorhina cyclia BERRY (1947) (Bivalvia: Thyasiridae) on the Southern California Borderland

Abstract

Abstract, ddontorhiua cyclin BERRY, 1947 is widely distributed on the continental borderland of southern California. It is a fannal element I n every major habitat type including two of the outer deep basins, Santa Cruz Basin and 8an Nicolas Basin. On the mainland shelf it is discontinuously distributed from Point Conception to the USDiexican Border. The depth distribution of Adonforhincc reflects the fact that it inhahits both topographic highs and some of the deep basins of the tmrderland. Tts depth range is from 11.6 to 1,886.0 meters. While rldonforhina is able to inhabit H N ide range of sediment types, from 1.5 to 8.1 mean phi, it was primarily collect.ed from locations n here sediments ranged from 3 to 5 mean phi. A direrse array of macrofaunal taxa is associated with ddontorhina. The nrimerically dominant t a m varied from habitat to habitat.

Gauging benthic recovery from 20th century pollution on the southern California continental shelf using bivalves from sediment cores

“…Species were assigned to 1 of 7 functional groups differentiated by life habit and trophic group using ecological insights from Todd (2000) and Coan et al 2000: infaunal chemosymbiont-bearing (lucinids, thyasirids, solemyids), infaunal mixed feeders (facultative deposit-suspension; tellinids, psammobiids, solecurtids, and the asiphonate carditid Cyclocardia per Jones & Thompson 1987), infaunal obligate deposit feeders (siphonate nuculanids and yoldiids; asiphonate nuculids), epifaunal suspension feeders (mytilids, pectinids, chamids, limids; includes nestling hiatellids preferring coarse debris and semi-infaunal byssate Modiolinae), infaunal suspension feeders (cardiids, venerids, pharids, corbulids, thraciids), com mensals (inside the burrow of or attached to the body of another animal; lasaeids), and predators (cuspidariids). Commensal and predatory bivalves were rare in core assemblages (each constituting < 2% of bivalve shells) and were also either very erratically abundant (commensals, depending on whether a sample intersected with a burrow; up to 24% but median 1.5%) or consistently rare (few occurrences of single individuals) in living assemblages, and thus were excluded from further functional-group analysis.…”

Significance of the occurrence of chemoautotrophic bacterial endosymbionts in lucinid clams from Bermuda

“…Parvilucina multilineata prefers biotopes with high organic sedimentation and resuspension. A similar distribution pattern is shown by the Pacific relative P. tenuisculpta, which favors either a biotope with coarse carbonate sediments and high organic content or a habitat influenced by highly organic sewage wastewater (Jones & Thompson 1984). Several adaptations to the habitat can be found in the lucinids on Bermuda and generally in other relatives, e.g.…”

Phylogenetic relationships of Malarossia Berezovsky (Eocene, Ukraine) and trends in the size evolution of the carditids (Bivalvia, Carditidae)

“…lineage stands out with a clear trend towards larger size. All of these taxa represent infaunally shallow or very shallow burrowers (Yonge 1969;Jones & Thompson 1987).…”