Coordinated Stasis and Ecological Locking

Palaios ◽  
1995 ◽  
Vol 10 (2) ◽  
pp. 101 ◽  
Author(s):  
Paul J. Morris
Keyword(s):  
Coordinated Stasis

Coordinated stasis or coincident relative stability?

Paleobiology ◽  
1997 ◽  
Vol 23 (2) ◽  
pp. 155-164 ◽  
Author(s):  
Arnold I. Miller
Keyword(s):  
Relative Stability ◽  
Coordinated Stasis

Relative taxonomic and ecologic stability in Devonian marine faunas of New York State: a test of coordinated stasis

Paleobiology ◽  
2009 ◽  
Vol 35 (4) ◽  
pp. 499-524 ◽  
Author(s):  
Linda C. Ivany ◽  
Carlton E. Brett ◽  
Heather L. B. Wall ◽  
Patrick D. Wall ◽  
John C. Handley
Keyword(s):  
New York State ◽  
Small Scale ◽  
Ecological Change ◽  
Geographic Scale ◽  
Environmental Fluctuation ◽  
Faunal Composition ◽  
Basin Scale ◽  
Hamilton Group ◽  
Coordinated Stasis ◽  
Scale Variation

The concept of coordinated stasis, manifest as a pattern of long intervals of concurrent taxonomic and ecologic persistence separated by comparatively abrupt periods of biotic change, has been challenged in recent studies that claim a lack of prolonged persistence of taxa and associations. A key problem has been the difficulty of distinguishing faunal change owing to localized, short-term environmental fluctuation or patchiness from that indicating regionally pervasive, long-term evolutionary or ecological change. Here, we use an extensive database from the Middle Devonian Hamilton Group of the Appalachian Basin to test for taxonomic and ecologic persistence within this ecological-evolutionary subunit, a succession of purported relative stability. Replicate samples collected from many localities and stratigraphic horizons over a wide geographic area allow us to address the effects of small-scale environmental variation and localized faunal patchiness while exploring basin-scale variation in faunal composition within and between the formations of the Hamilton Group.Observed stratigraphic distributions of fossils are consistent with a scenario in which all taxa are present from bottom to top of the Hamilton Group, and absences result only from sampling failure. Although small-scale variation in faunal composition indeed does occur, there is no more variation among formations than occurs within them. Assemblages from different formations, whether they are defined by taxonomic or ecologic composition, are statistically indistinguishable according to several independent metrics, including ANOSIM and a maximum likelihood estimation that evaluates stratigraphic turnover using Bayesian “Information Criterion.” Simulated data sets indicate that test results are most consistent with species-level extinction of 2.6% per Myr within the Hamilton Group, far lower than the Givetian rate of 11.5% per Myr generic extinction derived from a global database. Such faunal persistence over the ~5.5 Myr encompassed by this unit is consistent with the pattern of coordinated stasis. Earlier studies showing greater amounts of temporal turnover in Hamilton Group faunas are likely influenced by their smaller geographic scale of analysis, suggesting that regional studies done elsewhere may yield similar results.

scholarly journals Coordinated Stasis: Informing Expectations and Null Muddles

1996 ◽  
Vol 8 ◽  
pp. 346-346
Author(s):  
Kenneth M. Schopf ◽  
Tomasz K. Baumiller
Keyword(s):  
Coordinated Stasis

So ... Now What? Thoughts and Ruminations about Coordinated Stasis

Palaios ◽  
1999 ◽  
Vol 14 (4) ◽  
pp. 297 ◽  
Author(s):  
Linda C. Ivany
Keyword(s):  
Coordinated Stasis

New perspectives on transitions between ecological-evolutionary subunits in the “type interval” for coordinated stasis

Paleobiology ◽  
2012 ◽  
Vol 38 (4) ◽  
pp. 664-681 ◽  
Author(s):  
James J. Zambito ◽  
Carlton E. Brett ◽  
Gordon C. Baird ◽  
Sarah E. Kolbe ◽  
Arnold I. Miller
Keyword(s):  
New York ◽  
Environmental Changes ◽  
New York State ◽  
Reference Interval ◽  
Data Set ◽  
Type Region ◽  
High Resolution Data ◽  
Coordinated Stasis ◽  
Delta Progradation ◽  
Northern Appalachian Basin

Northern Appalachian Basin deposits and associated fossils have served as exemplars for ecological-evolutionary investigations, and as the reference interval for the concept of coordinated stasis. Here, we examine faunal and environmental changes within the uppermost Hamilton and lowermost Genesee Groups of the late Middle Devonian succession of New York State. Dramatic diversity loss, faunal migrations, and ecological restructuring recognized in these strata have been used previously to define the end of the Hamilton ecological-evolutionary subunit, and, furthermore, these strata and corresponding faunal changes represent the type region for the global Taghanic Biocrisis. We present and analyze a new, high-resolution data set of post-Taghanic Genesee fossil assemblages, in which we recognize 11 biofacies corresponding to an onshore-offshore (depth) gradient. The Genesee Fauna shows an unexpectedly high taxonomic similarity to nearshore biofacies of the pre-Taghanic Hamilton Fauna, related to the persistence of siliciclastic-dominated nearshore settings through the Taghanic Biocrisis, whereas the onset of anoxic/dysoxic conditions typified offshore portions of the environmental gradient. The “Nearshore Refugium Model” of Erwin offers a possible explanation for the persistence of taxa through the biocrisis in nearshore settings. This constriction was followed by subsequent expansion of these residual taxa to offshore environments in relatively similar associations, as increased Acadian orogenic activity and resultant delta progradation increased habitable space offshore by decreasing the extent of deeper-water, oxygen-poor settings. Although taxonomic similarity was high between the Hamilton and Genesee Faunas, biofacies structure differed primarily because of tectonically driven physical transformations to the basin and associated biotic turnover. Nevertheless, the combination of high taxonomic persistence of Hamilton nearshore taxa and the introduction of relatively few new taxa in the Genesee Fauna resulted in a taxonomic holdover that was much higher than observed in the original formulation of coordinated stasis.

Does coordinated stasis yield taxonomic and ecologic stability?: Middle Devonian Hamilton Group of central New York

Geology ◽  
2002 ◽  
Vol 30 (12) ◽  
pp. 1055 ◽  
Author(s):  
Nicole Bonuso ◽  
Cathryn R. Newton ◽  
James C. Brower ◽  
Linda C. Ivany
Keyword(s):  
New York ◽  
Middle Devonian ◽  
Central New York ◽  
Hamilton Group ◽  
Coordinated Stasis

Coordinated stasis: An overview

1996 ◽  
Vol 127 (1-4) ◽  
pp. 1-20 ◽  
Author(s):  
Carlton E. Brett ◽  
Linda C. Ivany ◽  
Kenneth M. Schopf
Keyword(s):  
Coordinated Stasis
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