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Titolo:
Structural features and taphonomic pathways of a high-biomass epifauna in the northern Gulf of Trieste, Adriatic Sea
Autore:
Zuschin, M; Stachowitsch, M; Pervesler, P; Kollmann, H;
Indirizzi:
Univ Vienna, Inst Palaeontol, A-1090 Vienna, Austria Univ Vienna Vienna Austria A-1090 nst Palaeontol, A-1090 Vienna, Austria Univ Vienna, Dept Marine Biol, Inst Ecol & Conservat Biol, A-1090 Vienna, Austria Univ Vienna Vienna Austria A-1090 Conservat Biol, A-1090 Vienna, Austria
Titolo Testata:
LETHAIA
fascicolo: 4, volume: 32, anno: 1999,
pagine: 299 - 317
SICI:
0024-1164(199912)32:4<299:SFATPO>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
FOSSIL RECORD; PALEOCOMMUNITY RECONSTRUCTION; DEATH ASSEMBLAGES; TEXAS BAYS; RED-SEA; PALEOECOLOGY; COMMUNITY; PRESERVATION; DISSOLUTION; EOCENE;
Keywords:
Benthic islands; Mediterranean; palaeoecology; Recent; taphonomy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
75
Recensione:
Indirizzi per estratti:
Indirizzo: Zuschin, M Univ Vienna, Inst Palaeontol, Althanstr 14, A-1090 Vienna, Austria Univ Vienna Althanstr 14 Vienna Austria A-1090 Vienna, Austria
Citazione:
M. Zuschin et al., "Structural features and taphonomic pathways of a high-biomass epifauna in the northern Gulf of Trieste, Adriatic Sea", LETHAIA, 32(4), 1999, pp. 299-317

Abstract

Benthic ecologists and palaeoecologists usually associate soft bottoms with infaunal species. On the sublittoral muddy soft bottoms in the inner Gulfof Trieste, however, a complex epifauna is developed, whose biomass, structural features and taphonomy is investigated here. The total biomass amounted to an average of 556 g wet weight / m(2) and is strongly dominated by suspension feeders, followed by predators and deposit feeders. The biomass can be divided into two major groups: biomass on benthic islands (isolated and small-sized rockgrounds and shellgrounds which are embedded in or lie on the sediment) and sediment dwellers. The former category includes so-calledmultispecies clumps, which make up 92.5% of the total biomass. The latter category encompasses organisms that inhabit the sediment surface itself. The epigrowth on benthic islands makes up 84.6% of total epifaunal biomass and is exclusively represented by suspension feeders. Serpulids are strongly dominant, followed by ascidians, sponges, anemones and bivalves. The vagileorganisms associated with multi-species clumps represent 7.9% of the totalepifauna and are also mostly suspension feeders. The echinoderms Ophiothrix quinquemaculata and Cucumaria planci are the two dominant forms, followedby crustaceans and echinoids. Soft-bottom dwellers represent only 7.5% of total epifaunal biomass and consist mainly of deposit feeders and predators. Three different post-mortem pathways can be recognized for the studied epifauna. Taphonomic loss due to selective preservation is the most importanttaphonomic process shaping the death assemblage and affects especially thesoft-bodied epigrowth on benthic islands. Mineralized epigrowth and shelled soft-bottom dwellers are the main source of benthic islands. Vagile faunas on such islands, in contrast, are strongly affected by disarticulation / fragmentation and their body parts contribute considerably to the sediment composition. The death assemblage does not reflect the trend of low biomassnear the shallow stations off the mouth of the Isonzo River and higher biomass at most stations positioned further away from the river and in deeper water (>10 m), but accurately reflects the borders of the epifauna, which coincide with the sedimentary facies and the preponderance of the suspension-feeding life habit.

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Documento generato il 21/09/20 alle ore 12:26:24