Comparative Analysis of Drilling Frequencies in Recent Brachiopod-Mollusk Associations From the Southern Brazilian Shelf

Simões, Marcello Guimarães; Rodrigues, Sabrina Coelho; Kowalewski, Michał

doi:10.2110/palo.2006.p06-040r

Cited by 49 publications

(26 citation statements)

References 45 publications

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“…Of course, being energetically profitable prey does not necessarily make brachiopods preferable to other prey, such as molluscs. This might explain the extremely broad range of reported drilling frequencies, ranging from 0.4 to 34.5% in the few studies that have been undertaken on drilling in Cainozoic brachiopods (Baumiller et al (2006) and Simoes et al (2007)). …”

Section: Discussionmentioning

confidence: 99%

Drill holes in Australian Cainozoic brachiopods

2008

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The fossil record of drill holes in marine invertebrates has received a considerable amount of interest from paleontologists, primarily due to its importance for reconstructing the history of interactions between drilling predators and their prey. Such drill holes have been described in numerous studies of Paleozoic brachiopods but rarely in those focusing on brachiopods of the post-Paleozoic, a striking pattern given that in the late Mesozoic and Cainozoic drilling gastropods diversified and frequencies of drilled molluscs increased dramatically. During the past several years, however, drilled brachiopods were reported in several studies of the Mesozoic and Cainozoic, suggesting that this phenomenon may be more common than has been previously assumed. Here we report on 10 genera of brachiopods from four Cainozoic basins in Australia of which 7 shows evidence of having been drilled by predators. Of 298 specimens examined, 38 contain a single complete hole. Drilled specimens were identified in all 4 basins and in all stratigraphic units. When considered in the context of recent reports of drilled Cainozoic brachiopods, these Australian brachiopods further imply that drilling predation on these invertebrates was geographically, taxonomically and temporally widespread.

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Section: Discussionmentioning

confidence: 99%

Drill holes in Australian Cainozoic brachiopods

2008

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“…Remarkably, the most common ichnofossil observed among the shells from Chuí Creek is Oichnus, which is virtually absent from the other two concentrations (Lopes & Buchmann, 2008;Lopes, 2012). This ichnogenus, however, indicates predatory activity by gastropods, thus it is not produced on dead remains, although cases of erroneous attacks by predators on dead shells are possible (Kelley & Hansen, 2003;Simões et al, 2007). The gastropods that exhibit bioerosion (Zidona dufresnei, Adelomelon brasiliana and Olivancillaria urceus) are epifaunal taxa that inhabit depths below the influence of normal waves (some 10-12 m) and are much larger than the bivalves, thus are likely to remain exposed for a long time period and be subject to the action of bioeroders after death.…”

Section: Taphonomymentioning

confidence: 99%

A middle Pleistocene marine molluscan assemblage from the Southern coastal plain of Rio Grande do Sul State

Lopes¹,

Simone²,

Dillenburg³

et al. 2013

rev. bras. paleontol.

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-A marine molluscan assemblage is described from four fossil concentrations in the Coastal Plain of Rio Grande do Sul State, southern Brazil. The concentrations were found at the same stratigraphic interval, some 7.5 m above present sea-level, in a layer deposited in a shallow marine environment during the penultimate marine transgression around 230 ka BP and currently exposed along the banks of Chuí Creek, located some 11 km landwards of the present coastline. The assemblage is composed of a mixture of highly fragmented, unidentifi able shells and well-preserved bivalves and gastropods. Many bivalve remains are complete, including juveniles and thin-shelled taxa, lacking signs of abrasion or bioerosion. The origin of the shell concentrations is interpreted as a short-term depositional event, generated by storms, in shallow water settings under a marine transgressive regime. The predominant taxa in the assemblage are infaunal, stenohaline bivalves that inhabit shallow sandy bottoms, with few gastropods and epifaunal organisms. Most of the taxa have living representatives today in the southern Brazilian coast, indicating a mixture of Argentinean and Caribbean (or Brazilian) malacological provinces. The presence of taxa that are not found living in the coast of Rio Grande do Sul today (Anomalocardia brasiliana, Chione paphia, C. cancellata, Anadara brasiliana and Arcinella brasiliana), suggests warmer oceanographic conditions coinciding with past sea-level highstands, also indicated by similar taxa found in fossil concentrations in the Uruguayan and Argentinean coasts. A discussion of the stratigraphic position, age and correlation of this assemblage with other outcrops is also presented.Key words: Chuí Creek, Barrier System II, Pleistocene, fossil assemblage, paleobiogeography, paleoenvironment.RESUMO -Aqui é descrita uma assembleia de moluscos marinhos a partir de quatro concentrações fossilíferas encontradas na Planície Costeira do Estado do Rio Grande do Sul, Brasil. As concentrações foram encontradas na mesma posição estratigráfi ca, aproximadamente 7,5 m acima do nível atual do mar, em uma camada depositada em ambiente marinho raso durante a penúltima transgressão marinha em torno de 230 ka AP e atualmente exposta nas barrancas do Arroio Chuí, localizado aproximadamente 11 km da linha de costa atual. A assembleia é composta por uma mistura de conchas altamente fragmentadas, não identifi cáveis, bem como bivalves e gastrópodes bem preservados. Muitos bivalves são completos, incluindo juvenis e táxons de conchas fi nas, sem sinais de abrasão ou bioerosão. A origem dessas concentrações é interpretada como evento deposicional de curta duração, gerado por tempestade, em águas rasas sob regime marinho transgressivo. Os táxons predominantes na assembleia são bivalves estenohalinos infaunais que habitam fundos arenosos rasos, com poucos gastrópodes e organismos epifaunais. A maioria dos táxons ainda habita a costa sul do Brasil, indicando uma mistura das províncias malacológicas Argentina e Caribenha (ou Br...

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“…No Brasil, a maioria destes estudos concentra-se na costa de São Paulo (Barbour Wood et al 2006, Rodrigues et al 2008, Simões et al 2007, Krause et al 2010, Rodrigues & Simões 2010.…”

Section: Labarbera 2004unclassified

“…A predação é o principal fator ecológico de fragmentação, e sob essa definição também se encontra a perfuração predatória. Por ser uma condição bastante conspícua em moluscos, e também em diversos outros organismos com partes biomineralizadas, a predação tem grande valor como ferramenta paleoecológica (Kowalewski & Kelley 2002, Simões et al 2007.…”

Section: Abrasãounclassified

Assinaturas tafonômicas em moluscos recentes e seu significado paleoambiental

2017

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A partir do tipo de dano (injúria) presente nos restos bioclásticos é possível inferir os processos de alteração de informação biológica que agem durante a incorporação destes restos no registro fossilífero. Tais danos, denominadas assinaturas tafonômicas, possuem direta relação com os fatores ambientais que atuaram após a morte e durante a permanência dos bioclastos no sedimento antes da fossilização final, e durante a eodiagênese. Assim, é possível interpretar as condições ambientais a partir da identificação do padrão de assinaturas tafonômicas presentes (perfil de dano) nos restos fossilizáveis. Propósito deste texto é explorar os prinpadrão de assinaturas tafonômicas presentes (perfil de dano) nos restos fossilizáveis. propósito deste texto é explorar os principais tipos de dano presentes em restos de moluscos (conchas) de acordo com sua origem ambiental. Além disso, será explicado como funciona, tafonomicamente, o intervalo sedimentar onde as assinaturas se originam, com detalhamento da bioturbação e dos principais aspectos geoquímicos presentes nesta zona de alteração dos restos biológicos. Será dada maior ênfase em estudos conduzidos com restos de moluscos marinhos, por serem mais bem conhecidos e mais numerosos na bibliografia. Também será demonstrada a viabilidade de interpretação paleoambiental a partir das assinaturas tafonômicas em moluscos.

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Comparative Analysis of Drilling Frequencies in Recent Brachiopod-Mollusk Associations From the Southern Brazilian Shelf

Cited by 49 publications

References 45 publications

Drill holes in Australian Cainozoic brachiopods

Drill holes in Australian Cainozoic brachiopods

A middle Pleistocene marine molluscan assemblage from the Southern coastal plain of Rio Grande do Sul State

Assinaturas tafonômicas em moluscos recentes e seu significado paleoambiental

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