Pliocene seasonality across the North Atlantic inferred from cheilostome bryozoans

Knowles, Tanya; Taylor, Paul D.; Williams, Mark; Haywood, Alan M.; Okamura, Beth

doi:10.1016/j.palaeo.2009.04.006

Cited by 33 publications

(20 citation statements)

References 49 publications

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“…Fossil bryozoans from the Burica Peninsula (TEP) were collected individually from the Armuelles Formation in March 2011. We also incorporate fossil material hand-picked from geological outcrops in Florida and Virginia, USA (Knowles et al 2009; Fig. 2), to present a broader picture of ENSO variability in the Pliocene, to complement the picture gained for the TEP.…”

Section: Methodsmentioning

confidence: 99%

Evidence of El Niño/La Niña–Southern Oscillation Variability in the Neogene-Pleistocene of Panama Revealed by a New Bryozoan Assemblage-Based Proxy

Okamura¹,

O’Dea²,

Taylor³

et al. 2013

BMS

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Here we explore how fossil cheilostome bryozoans can demonstrate El Niño/La Niña-Southern Oscillation (ENSO) variability in ancient tropical environments of the tropical eastern Pacific and southwestern Caribbean when used collectively to produce frequency distributions of estimates of mean annual ranges in temperature (MARTs) via zooid-size MART analysis (zs-MART). The approach is based on linking variation in the sizes of constituent zooids in bryozoan colonies with the temperature regimes in which the zooids developed. The shapes of frequency distributions of zs-MART estimates from modern environments are consistent with known upwelling and non-upwelling environments and ENSO variability. Data from fossil colonies provide evidence that ENSO variability characterized Caribbean environments in what is now present-day Panama during the Miocene and Pliocene (thus supporting neither a permanent El Niño nor a permanent La Niña in the Pliocene), but not the Pleistocene after the Isthmus of Panama closed. Western Atlantic data provide further evidence for ENSO variability in the Pliocene of Florida but not Virginia. Our study shows the potential of bryozoan assemblages to infer variation in seasonal regimes thus encouraging the further development of this proxy for inferring ENSO variability.

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Section: Methodsmentioning

confidence: 99%

Evidence of El Niño/La Niña–Southern Oscillation Variability in the Neogene-Pleistocene of Panama Revealed by a New Bryozoan Assemblage-Based Proxy

Okamura¹,

O’Dea²,

Taylor³

et al. 2013

BMS

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“…The rule almost certainly represents a universal response, whether adaptive or not (see Kingsolver and Huey, 2008, for further discussion). In the Bryozoa it applies at the level of the zooid rather than the colony (Okamura and Bishop, 1988;Hunter and Hughes, 1994;Okamura, 1999, 2000b;O'Dea and Jackson, 2002;O'Dea, 2003O'Dea, , 2005Amui-Vedel et al, 2007;O'Dea et al, 2007b;Knowles et al, 2009). In general, and provided sufficient care is taken to avoid sampling unrepresentative zooids, changes in zooid size provide a reliable indication of changes in temperature (for detailed discussion see Okamura et al, in press).…”

Section: Mean Zooid Sizementioning

confidence: 99%

Environmental change prior to the K–T boundary inferred from temporal variation in the morphology of cheilostome bryozoans

O’Dea

Håkansson

Taylor

et al. 2011

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…In fact, bryozoan colonies have even been used to infer paleoseasonality using this relationship (Knowles et al. ). It has also been found that species with larger zooids are more often found living in higher latitudes (Kuklinski and Taylor ) or at lower temperatures (Okamura and Bishop ).…”

Section: Discussionmentioning

confidence: 99%

Cope's Rule in a modular organism: Directional evolution without an overarching macroevolutionary trend

Liow

Taylor

2019

Evolution

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Cope's Rule describes increasing body size in evolutionary lineages through geological time. This pattern has been documented in unitary organisms but does it also apply to module size in colonial organisms? We address this question using 1169 cheilostome bryozoans ranging through the entire 150 million years of their evolutionary history. The temporal pattern evident in cheilostomes as a whole shows no overall change in zooid (module) size. However, individual subclades show size increases: within a genus, younger species often have larger zooids than older species. Analyses of (paleo)latitudinal shifts show that this pattern cannot be explained by latitudinal effects (Bergmann's Rule) coupled with younger species occupying higher latitudes than older species (an “out of the tropics” hypothesis). While it is plausible that size increase was linked to the advantages of large zooids in feeding, competition for trophic resources and living space, other proposed mechanisms for Cope's Rule in unitary organisms are either inapplicable to cheilostome zooid size or cannot be evaluated. Patterns and mechanisms in colonial organisms cannot and should not be extrapolated from the better‐studied unitary organisms. And even if macroevolution simply comprises repeated rounds of microevolution, evolutionary processes occurring within lineages are not always detectable from macroevolutionary patterns.

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Pliocene seasonality across the North Atlantic inferred from cheilostome bryozoans

Cited by 33 publications

References 49 publications

Evidence of El Niño/La Niña–Southern Oscillation Variability in the Neogene-Pleistocene of Panama Revealed by a New Bryozoan Assemblage-Based Proxy

Evidence of El Niño/La Niña–Southern Oscillation Variability in the Neogene-Pleistocene of Panama Revealed by a New Bryozoan Assemblage-Based Proxy

Environmental change prior to the K–T boundary inferred from temporal variation in the morphology of cheilostome bryozoans

Cope's Rule in a modular organism: Directional evolution without an overarching macroevolutionary trend

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