نتایج جستجو برای: planktonic taxon

تعداد نتایج: 16999  

Journal: :دیرینه شناسی 0
ابراهیم عبدالهی محمد وحیدی نیا مهناز پروانه نژاد شیرازی

in order to study of biostratigraphy and age dating of kazhdumi formation, based on planktonic foraminifera and correlation of identified biozones with global standard biozones, this formation at tang-e-maghar have been studied. in this study 73 samples of kazhdumi formation, with 270 meter thickness, have been collected. the main lithological units at the studied section consist of the black b...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2015
Jocelyn Anne Sessa Ekaterina Larina Katja Knoll Matthew Garb J Kirk Cochran Brian T Huber Kenneth G MacLeod Neil H Landman

Ammonites are among the best-known fossils of the Phanerozoic, yet their habitat is poorly understood. Three common ammonite families (Baculitidae, Scaphitidae, and Sphenodiscidae) co-occur with well-preserved planktonic and benthic organisms at the type locality of the upper Maastrichtian Owl Creek Formation, offering an excellent opportunity to constrain their depth habitats through isotopic ...

2007
N. Brede K. Schwenk

Resting egg banks of microcrustaceans have been used to reconstruct the evolutionary and ecological history of species. However, recent studies provided evidence for a discrepancy between dormant propagules in the sediment and the planktonic population. This pattern raises two questions: First, what is the value of data on resting egg banks for population dynamics over time and second, which co...

2016
Erik Wolfgring Michael Wagreich

Deposits spanning the Radotruncana calcarata Taxon Range Zone at the Postalm section, Northern Calcareous Alps (Austria) are examined quantitatively for foraminiferal assemblages, especially the planktonic group. This study focuses on establishing a high resolution record spanning an 800 ka long stratigraphic interval from the active continental margin of the Penninic Ocean. The Postalm section...

2011
J. Cameron Thrash Alex Boyd Megan J. Huggett Jana Grote Paul Carini Ryan J. Yoder Barbara Robbertse Joseph W. Spatafora Michael S. Rappé Stephen J. Giovannoni

Mitochondria share a common ancestor with the Alphaproteobacteria, but determining their precise origins is challenging due to inherent difficulties in phylogenetically reconstructing ancient evolutionary events. Nonetheless, phylogenetic accuracy improves with more refined tools and expanded taxon sampling. We investigated mitochondrial origins with the benefit of new, deeply branching genome ...

2013
Ryan J. Wasserman Margaux Noyon Trevor S. Avery P. William Froneman

BACKGROUND Classically, estuarine planktonic research has focussed largely on the physico-chemical drivers of community assemblages leaving a paucity of information on important biological interactions. METHODOLOGY/PRINCIPAL FINDINGS Within the context of trophic cascades, various treatments using in situ mesocosms were established in a closed estuary to highlight the importance of predation ...

2015
Martin W Hahn Ulrike Koll Jitka Jezberová Antonio Camacho

The free-living planktonic freshwater bacterium Polynucleobacter necessarius subspecies asymbioticus (> 99% 16S rRNA similarity) represents a taxon with a cosmopolitan distribution and apparently ubiquitous occurrence in lentic freshwater habitats. We tested for intra-taxon biogeographic patterns by combining cultivation-independent and cultivation methods. A culture collection of 204 strains i...

Journal: :The Biological bulletin 2013
Daphne Gail Fautin Lacey Malarky Jorge Soberón

We sought to determine if the global distribution of sea anemones (cnidarian order Actiniaria) conforms to the classic pattern of biogeography--taxon richness at the equator with attenuation toward the poles--a pattern that is derived almost entirely from data on terrestrial plants and animals. We plotted the empirical distribution of species occurrences in 10° bands of latitude based on publis...

Journal: :Molecular biology and evolution 1996
R J Gast D A Caron

Recent analyses of the small subunit ribosomal DNA (srDNA) from dinoflagellate symbionts of cnidaria have confirmed historical descriptions of a diverse but well-defined clade, Symbiodinium, as well as several other independent symbiont lineages (Rowan 1991; Rowan and Powers 1992; Sadler et al. 1992; McNally et al 1994). Dinoflagellates also occur as intracellular symbionts in a number of pelag...

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