First isotopic and multidisciplinary evidence for nonmarine coelacanths and pycnodontiform fishes: palaeoenvironmental implications

Poyato-Ariza, Francisco José; Talbot, Michael R.; Fregenal-Martı́nez, Marı́a Antonia; Meléndez, Nieves; Wenz, Sylvie

doi:10.1016/s0031-0182(98)00085-6

Cited by 78 publications

(40 citation statements)

References 40 publications

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“…This includes the presence of oligohaline charophyte associations (Schudack 1989; Martõ Ân-Closas and Die Âguez 1998), freshwater insects (Martõ Ânez-Delclo Ás et al 1995), cray®sh (Rabada Á 1993 and freshwater ®sh (Poyato-Ariza and Wenz 1995). Stratigraphic, sedimentological and palaeogeographic data indicating oligohaline conditions in the basin are also supported by recent isotopic analyses (Talbot et al 1995;Poyato-Ariza et al 1998).…”

Section: Paratypes Specimens Un ä 012±014supporting

confidence: 67%

Frenelopsis (Coniferales: Cheirolepidiaceae) And Related Male Organ Genera From The Lower Cretaceous Of Spain

et al. 2002

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ABSTRACT. Vegetative plant remains and microsporangiate cones, related to the fossil genera Frenelopsis and Classostrobus respectively, were studied in three localities from the Lower Cretaceous of the Pyrenees and Iberian Ranges (Spain). Sterile remains belong to three different species: F. rubiesensis Barale, F. ugnaensis sp. nov. and F. turolensis sp. nov. The male cones Classostrobus ugnaensis sp. nov. and C. turolensis sp. nov. are associated with the two latter species respectively, and C. turolensis is found in connection with F. turolensis. Internodes of F. ugnaensis display small hemispherical papillae and long conical hairs covering the entire cuticle surface, while F. turolensis has a strip of hairs near the leaf margin, in addition to more massive outer stomatal papillae and higher stomatal density. The tiny cones of C. ugnaensis bear microsporophyll cuticles capped with vermiculate¯attened papillae and a fringe of marginal hairs, while C. turolensis has a central area of microsporophylls covered by long conical hairs. Sedimentological and taphonomic analyses show that the assemblages studied belong to a wide spectrum of habitats. These indicate that Spanish Lower Cretaceous frenelopsids were xeromorphic plants, able to adapt to helophytic and riparian habitats, and grew in brackish coastal marshes and¯uvio-lacustrine freshwater environments.

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Section: Paratypes Specimens Un ä 012±014supporting

confidence: 67%

Frenelopsis (Coniferales: Cheirolepidiaceae) And Related Male Organ Genera From The Lower Cretaceous Of Spain

et al. 2002

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“…Therefore, these taxa can be distinguished from those feeding in (or inhabiting) terrestrial or estuarine ecosystems (e.g. Koch et al 1992, Schmitz et al 1997, Poyato-Ariza et al 1998, Kennedy et al 2002, Clementz et al 2003. Price & Gestsdóttir 2006, Kocsis et al 2007).…”

Section: Sr Isotope Ratios In Bioapatitementioning

confidence: 99%

Estimating marine resource use by the American crocodile Crocodylus acutus in southern Florida, USA

Wheatley¹,

Peckham²,

Newsome³

et al. 2012

Mar. Ecol. Prog. Ser.

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Alligators and crocodiles differ in their physiological capacity to live in saline waters. Crocodiles can tolerate high-salinity water, at least for limited timeframes, whereas alligators and their close relatives cannot. Experiments have placed different crocodylians in various water salinities to document physiological responses, but no study has estimated the extent to which natural populations of crocodylids can live independent of fresh water. Here we estimated marine food and perhaps seawater contributions to a population of American crocodile Crocodylus acutus in southernmost Florida, USA. We evaluated the use of carbon, oxygen, and strontium isotopes as tracers of marine versus terrestrial sources. We compared C. acutus isotopic values to those of marine reptiles (marine iguanas and Pacific loggerhead turtles) and to American alligators, which require fresh water. We found that freshwater reptiles can be discriminated from those that drink seawater (or survive on metabolic and prey-included water in saline habitats) based on the magnitude of population-level oxygen isotope variation in bioapatite, whereas mean carbon isotope values discriminate between marine versus terrestrial food consumption. We used a 2 endmember (seawater and fresh water) mixing model to calculate percentage of marine resources used by C. acutus. Results indicate that adult C. acutus in southern Florida use marine food about 65% of the time and seawater or water gleaned from marine food about 80% of the time. This suggests that behavioral osmoregulatory techniques (i.e. seeking fresh water specifically for drinking, as suggested by other researchers) may not be necessary and that C. acutus is capable of being largely ecologically independent of fresh water.

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“…Water alkalinity was deduced from independent criteria using sedimentological and geochemical sources (Poyato-Ariza et al, 1998). The amphibious category gathers those species that are considered to spend at least part of their life cycle in wetlands and the remainder in a terrestrial environment; Scarabaeidae.…”

Section: Ecological Structurementioning

confidence: 99%

A holistic approach to the palaeoecology of Las Hoyas Konservat-Lagerstätte (La Huérguina Formation, Lower Cretaceous, Iberian Ranges, Spain)

Buscalioni¹,

Fregenal-Martínez²

2010

J. iber. geol.

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The Las Hoyas fossil site (Lower Cretaceous, Iberian Ranges, Spain) is a classic lacustrine Fossil-Lagerstätte that exemplifies the features predicted by the original concept of Konservat-Lagerstätten in relation to the quantity of remains, quality of preservation, completeness, and preservation by a combination of obrution, stagnation and, in this case, mainly bacterial sealing. Fossils are preserved in rhythmically laminated limestones deposited in a environment that underwent strong, climatically driven cyclical oscillations in water level within the framework of a seasonal, subtropical, regional-scale wetland. Extensive systematic layer-bylayer excavation and geological research have resulted in a comprehensive understanding of the stratigraphy and sedimentology of the locality and its regional palaeogeography. Two approaches have allowed the palaeoecology of the fossil association to be reconstructed. Firstly, autoecological reconstructions of the fossil groups are supplemented by palaeoenvironmental reconstructions based on the sedimentology. This considers taphonomic features and the ecological structure of the whole association, including vegetation and animals. The organization of the ecosystem resembles that of extant lentic ecosystems. It is dominated by obligate aquatic and amphibious organisms; facultative terrestrial organisms are scarce. Several lines of evidence from flora and fauna indicate strong seasonality and water stress. The second approach is dynamic and aims to unravel the information transferred to the fossil record about ecological dynamics and evolution by combining stratigraphical and palaeontological information and integrating this in a spatial and temporal framework. This analysis illustrates that Las Hoyas has a significant facies bias, reflecting alternating

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First isotopic and multidisciplinary evidence for nonmarine coelacanths and pycnodontiform fishes: palaeoenvironmental implications

Cited by 78 publications

References 40 publications

Frenelopsis (Coniferales: Cheirolepidiaceae) And Related Male Organ Genera From The Lower Cretaceous Of Spain

Frenelopsis (Coniferales: Cheirolepidiaceae) And Related Male Organ Genera From The Lower Cretaceous Of Spain

Estimating marine resource use by the American crocodile Crocodylus acutus in southern Florida, USA

A holistic approach to the palaeoecology of Las Hoyas Konservat-Lagerstätte (La Huérguina Formation, Lower Cretaceous, Iberian Ranges, Spain)

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