Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
LACK OF STASIS IN LATE CENOZOIC MARINE FAUNAS AND COMMUNITIES, CENTRAL CALIFORNIA
Autore:
STANTON RJ; DODD JR;
Indirizzi:
TEXAS A&M UNIV,DEPT GEOL & GEOPHYS COLLEGE STN TX 77843 INDIANA UNIV,DEPT GEOL BLOOMINGTON IN 47405
Titolo Testata:
Lethaia
fascicolo: 3, volume: 30, anno: 1997,
pagine: 239 - 256
SICI:
0024-1164(1997)30:3<239:LOSILC>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
NEOGENE; MODEL;
Keywords:
COMMUNITY STRUCTURE; COORDINATED STASIS; ECOLOGICAL LOCKING; LATE CENOZOIC; CALIFORNIA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
59
Recensione:
Indirizzi per estratti:
Citazione:
R.J. Stanton e J.R. Dodd, "LACK OF STASIS IN LATE CENOZOIC MARINE FAUNAS AND COMMUNITIES, CENTRAL CALIFORNIA", Lethaia, 30(3), 1997, pp. 239-256

Abstract

Pliocene strata in the Kettleman Hills of west-central California were deposited in the broad San Joaquin embayment as a cyclic succession of parasequences during approximately three million years. Depositional environments within each cycle ranged from relatively open marine tobrackish and non-marine. Although the strata were deposited in similar, recurrent environments, the fauna changed gradually rather than during brief intervals separating periods of stasis. Although environmental gradients and community structure in the Pliocene San Joaquin Embayment and in the present-day San Francisco Bay are similar, species compositions of the faunas and of parallel communities at the two sites are markedly different. In addition, times of origination and extinction of species in the Pliocene strata of the Kettleman Hills and in San Francisco Bay do not document coordinated stasis within the Late Cenozoic. In contrast, Silurian and Devonian faunas and communities of the Appalachian Basin persisted with little change in ecological-evolutionary units that lasted for up to eight million years. Relatively brief intervals of great biotic change separate these intervals of stasis. One intriguing explanation of this pattern of coordinated stasis withinan ecologic-evolutionary unit is ecological locking, in which interaction between species within the community is sufficiently strong that only major changes in the environment are able to change community andfaunal composition. Probably the late Cenozoic fauna underwent rapid evolution as a result of rapidly changing environmental conditions within a complex and changing shallow inshore marine paleogeography. In contrast, coordinated stasis in the lower Paleozoic probably resulted from negligible evolution during long periods of stable to gradually changing environments in an outer shelf setting, punctuated by brief episodes of abrupt environmental change and large-scale turnover. The independent assortment of species in late Cenozoic parallel communities indicates that ecological locking did not exist.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 04:03:20