Data from: Fish and tetrapod communities across a marine to brackish salinity gradient in the Pennsylvanian (early Moscovian) Minto Formation of New Brunswick, Canada, and their palaeoecological and palaeogeographical implications
Ó Gogáin, Aodhán, University of Bristol
Falcon-Lang, Howard J., University of Bristol
Carpenter, David K., University of Southampton
Miller, Randall F., University of Lincoln
Benton, Michael J., University of Bristol
Pufahl, Peir K., Acadia University
Ruta, Marcello, University of Lincoln
Davies, Thomas G., University of Bristol
Hinds, Steven J., New Brunswick Department of Energy and Mines; Geological Surveys Branch; Fredericton New Brunswick E3B 5H1 Canada
Stimson, Matthew R., Natural Science Department; New Brunswick Museum; 277 Douglas Avenue Saint John New Brunswick E2K 1E5 Canada
Published Jun 30, 2017 on Dryad.
Cite this dataset
Ó Gogáin, Aodhán et al. (2017). Data from: Fish and tetrapod communities across a marine to brackish salinity gradient in the Pennsylvanian (early Moscovian) Minto Formation of New Brunswick, Canada, and their palaeoecological and palaeogeographical implications [Dataset]. Dryad. https://doi.org/10.5061/dryad.nc3f2
Euryhaline adaptations in Pennsylvanian vertebrates allowed them to inhabit the marine to freshwater spectrum. This is illustrated by new assemblages of fish and tetrapods from the early Moscovian Minto Formation of New Brunswick, Canada. Fish include chondrichthyans (xenacanthids and the enigmatic Ageleodus), acanthodians (gyracanthids and acanthodiforms), sarcopterygians (rhizodontids, megalichthyids and dipnoans), and actinopterygians (eurynotiforms). Tetrapods include small- to medium-sized, and largely aquatic, stem tetrapods (colosteids) and anthracosaurs (embolomeres). A key finding is that the parautochthonous fossil assemblages are preserved across a salinity gradient, with diversity (measured by the Simpson Index) declining from open marine environments, through brackish embayments, and reaching a nadir in tidal estuaries. Chondrichthyans dominate the entire salinity spectrum (65% of fossils), a distribution that demonstrates a euryhaline mode of life, and one large predatory chondrichthyan, Orthacanthus, may have practised filial cannibalism in coastal nurseries because its heteropolar coprolites contain juvenile xenacanthid teeth. In contrast, other fish communities were more common in open marine settings while tetrapods were more common in coastal brackish waters. While all these faunas were also likely to have been euryhaline, their osmoregulation was, perhaps, less versatile. The demonstration of widespread euryhalinity among fish and aquatic tetrapods explains why Pennsylvanian faunas generally show a cosmopolitan biogeography because taxa were able to disperse via seaways. It also resolves the paradox of enriched strontium isotopic signatures observed in these faunas because organisms would have been, at times, exposed to continental water bodies as well. Therefore, our new findings contribute to the long-running debate about the ecology of Pennsylvanian fishes and tetrapods.
Specimen catalogue for the Minto Formation.
This file is a catalogue of all vertebrate specimens reported from the Minto Formation. Details include genus and species names, number of fossil material for each specimen and the lithological horizon, with reference to Ó Gogáin et al. 2016, that each specimen belongs to.