Pubblicazione scientifica

Neogene sharks and rays from the Brazilian ‘Blue Amazon’

FILONE TECNOLOGICO	TEMA
trasformazione e commercializzazione

RIASSUNTO

The lower Miocene Pirabas Formation in the North of Brazil was deposited under influence of the proto-Amazon River and is characterized by large changes in the ecological niches from the early Miocene onwards. To evaluate these ecological changes, the elasmobranch fauna of the fully marine, carbonate-rich beds was investigated. A diverse fauna with 24 taxa of sharks and rays was identified with the dominant groups being carcharhiniforms and myliobatiforms. This faunal composition is similar to other early Miocene assemblages from the proto-Carribbean bioprovince. However, the Pirabas Formation has unique features compared to the other localities; being the only Neogene fossil fish assemblage described from the Atlantic coast of Tropical Americas. Phosphate oxygen isotope composition of elasmobranch teeth served as proxies for paleotemperatures and paleoecology. The data are compatible with a predominantly tropical marine setting with recognized inshore and offshore habitats with some probable depth preferences (e.g., Aetomylaeus groups). Paleohabitat of taxa particularly found in the Neogene of the Americas (†Carcharhinus ackermannii, †Aetomylaeus cubensis) are estimated to have been principally coastal and shallow waters. Larger variation among the few analyzed modern selachians reflects a larger range for the isotopic composition of recent seawater compared to the early Miocene. This probably links to an increased influence of the Amazon River in the coastal regions during the Holocene.

DATA

Data di pubblicazione: 23/08/2017

AUTORI

AGUILERA ORANGEL
LUZ ZONEIBE
CARRILLO-BRICENO JORGE D
KOCSIS LASZLO
VENNEMANN TORSTEN W
DE TOLEDO PETER MANN
NOGUEIRA AFONSO
AMORIM KAMILLA BORGES
MORAES-SANTOS HELOISA
POLCK MARCIA REIS
RUIVO MARIA DE LOURDES
LINHARES ANA PAULA
MONTEIRO-NETO CASSIANO

ENTE DI AFFERENZA

DEPARTAMENTO DE BIOLOGIA MARINHA INST BIOLOGIA UNIV FEDERAL FLUMINENSE NITEROI RIO DE JANEIRO BRASIL
INST GEOCIENCIAS UNIV FEDERAL DO PARA BELEM PARA BRASIL
PALAEONTOLOGICAL INST & MUSEUM UNIV ZURICH ZURICH CANTON OF ZURICH SWITZERLAND
FACULTY OF SCIENCE GEOLOGY GROUP UNIV BRUNEI DARUSSALAM JALAN TUNGKU GADONG BRUNEI DARUSSALAM
INST DYNAMIQUES SURFACE TERRESTRE UNIV LAUSANNE LAUSANNE VAUD SWITZERLAND
INST NATL DE PESQUISAS ESPACIAIS SAO JOSE DOS CAMPOS SAO PAULO BRASIL
INST ASTRONOMIA GEOFISICA E CIENCIAS ATMOSFERICAS UNIV SAO PAULO SAO PAULO BRASIL
COORDENACAO DE CIENCIAS DA TERRA E ECOLOGIA MUSEU PARAENSE EMILIO GOELDI BELEM PARA BRASIL
DEPARTAMENTO NATL DE PROD MINERAL RIO DE JANEIRO RIO DE JANEIRO BRASIL
UNIV ALABAMA US

RIVISTA

PLoS ONE, 12(8), e0182740

IMPACT FACTOR

2,870

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