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| Decelle, Johan; Siano, Raffaele; Probert, Ian; Poirier, Camille; Not, Fabrice. |
| Acantharia (Radiolaria) are widespread and abundant heterotrophic marine protists, some of which can host endosymbiotic eukaryotic microalgae. Although this photosymbiotic association was first described at the end of the 19th century, the diversity of the symbiotic microalgae remains poorly characterized. Here, we examined the identity of the microalgae associated with the acantharian species Acanthochiasma sp. by sequencing partial 18S and internal transcribed spacer (ITS) ribosomal DNA genes from cultured symbionts and directly from isolated holobiont specimens. Single Acanthochiasma cells contained multiple symbiotic partners, including distantly related dinoflagellates (Heterocapsa sp., Pelagodinium sp., Azadinium sp. and Scrippsiella sp.) as well as... |
| Tipo: Text |
Palavras-chave: Photosymbiosis; Radiolaria; Acantharia; Protists; Microalgae; Plankton. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00114/22493/21497.pdf |
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| Cortese, G.; Abelmann, A.; Gersonde, R.. |
| A submillennial resolution, radiolarian-based record of summer sea surface temperature (SST) documents the last five glacial to interglacial transitions at the subtropical front, southern Atlantic Ocean. Rapid fluctuations occur both during glacial and interglacial intervals, and sudden cooling episodes at glacial terminations are recurrent. Surface hydrography and global ice volume proxies from the same core suggest that summer SST increases prior to terminations lead global ice- volume decreases by 4.7 +/- 3.7 ka (in the eccentricity band), 6.9 +/- 2.5 ka (obliquity), and 2.7 +/- 0.9 ka (precession). A comparison between SST and benthic delta C-13 suggests a decoupling in the response of northern subantarctic surface, intermediate, and deep water masses... |
| Tipo: Text |
Palavras-chave: Paleotemperature; Radiolaria; Southern Ocean. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00236/34725/33297.pdf |
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| Jannou,Gabriel. |
| Se describen e ilustran dos asociaciones de radiolarios, una de la Formación Punta Noguera en su localidad tipo (área cercana a Punta Noguera) y la otra correspondiente a la Formación Punta Torcida, sobre la plataforma de abrasión de cabo Campo del Medio, ambas sobre la costa atlántica argentina fueguina. La Formación Punta Noguera ha sido asignada al Paleoceno superior/Eoceno inferior sobre la base de dinoquistes y foraminíferos. La asociación de radiolarios guías Buryella tetradrica Foreman, Amphishaera coronata s.l. (Ehrenberg), Amphishaera goruna (Sanfilippo y Riedel), Mita regina (Campbell y Clark), Theocapsomma erdnussa (Empson-Morin), la abundancia de Amphipyndax stocki (Campbell y Clark) y archaeodictyomítridos, y la primera aparición de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Radiolarios; Argentina; Tierra del Fuego; Paleoceno Superior; Radiolaria; Argentina; Tierra de Fuego; Late Paleocene. |
| Ano: 2007 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000200016 |
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