Resting stages in a submarine canyon: a component of shallow-deep-sea coupling?

Tommasa, Luigi Della; Belmonte, Genuario; Palanques, A.; Puig, Pere; Boero, Ferdinando

doi:10.1007/978-94-017-1982-7_23

Cited by 9 publications

(11 citation statements)

References 13 publications

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“…Cysts could also play an important role in exchange processes with the upper layers (Della Tommasa et al 2000). It can be argued that the settlement of water column protists (active cells as well as resting stages) is probably a recruitment strategy for some deep-sea protozoans.…”

Section: Origin Of Deep-sea Nanoflagellatesmentioning

confidence: 99%

Deep-sea heterotrophic nanoflagellates of the Eastern Mediterranean Sea: qualitative and quantitative aspects of their pelagic and benthic occurrence

Arndt¹,

Hausmann²,

Wolf³

2003

Mar. Ecol. Prog. Ser.

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Due to the significant lack of information on the community structure of deep-sea nanoflagellates and other nanofauna components as a potentially important component of deepsea matter fluxes, the aim of the present study was to check whether there is a specific deep-sea nanofauna (< 20 µm) community. Studies were carried out in the deep oligotrophic basins of the Eastern Mediterranean Sea around Greece (1249 to 4260 m depth). Direct microscopic counts and quantitative cultivation techniques were used to estimate the abundance and community structure of heterotrophic flagellates and amoebae from abyssopelagial samples and deep-sea sediments. Euglenids and bodonids were the dominant groups comprising about 2/3 of the abundance and biomass of flagellate nanofauna. Our direct counts clearly demonstrate that attention also has to be paid to species which seldom appear in crude cultures. The records of hemimastigid-like forms were remarkable in this respect. Among the 35 deep-sea nanofauna taxa identified here, 8 never appeared in cultures and 18 taxa were found only in cultures. At least 9 taxa have not been previously recorded from the deep sea. Meteora sporadica seems to be the first record of an endemic deep-sea heterotrophic nanoprotist. The variety of functional groups recorded indicates the nanofauna as part of a complex microbial food web in the deep sea. Estimates of potential maximum growth rates of fresh isolates from deep-sea waters ranged from 1 to 6.3 d -1 (Ancyromonas, Amastigomonas, Bodo, Caecitellus, Cafeteria, Kiitoksia, Massisteria, Percolomonas). There was considerable clonal variability.KEY WORDS: Protozoa · Biodiversity · Flagellates · Nanofauna · Amoebae · Growth rate · Deep-sea benthos · Deep-sea plankton Resale or republication not permitted without written consent of the publisher

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Section: Origin Of Deep-sea Nanoflagellatesmentioning

confidence: 99%

Deep-sea heterotrophic nanoflagellates of the Eastern Mediterranean Sea: qualitative and quantitative aspects of their pelagic and benthic occurrence

Arndt¹,

Hausmann²,

Wolf³

2003

Mar. Ecol. Prog. Ser.

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“…In fact, the evidence of high cyst diversity at some deep sites (e.g. submarine canyons, Della Tommasa et al, 2000) was attributed to particular geomorphological situations that improve the transport speed of cysts from (neritic) production areas to the storage (deep) ones.…”

Section: Discussionmentioning

confidence: 99%

“…Spherical, calcareous-walled, surface scaled, archeopyle shape as described by Janofske and Karwath (2000). C. albatrosianum cysts have been recorded in equatorial Atlantic Ocean by Janofske and Karwath (2000); they have been also recorded as Thoracosphaera albatrosiana by Dale and Dale (1992) in Atlantic and Pacific deep areas and by Della Tommasa et al (2000) in the Foix Canyon in NW Mediterranean. Vink et al (2000a) recorded it (as Sphaerodinella?…”

Section: Resting Stages (Fig 2)mentioning

confidence: 96%

“…Dale and Dale (1992) showed a high contribution of empty calcareous oceanic cysts (mostly Thoracosphaera=Calciodinellum albatrosiana) to the biogenic portion in Atlantic and Pacific Ocean sediments. More recently, Della Tommasa et al (2000) recorded a high concentration of resting stages (both Protoctista and Metazoa) in the Foix Canyon (NW Mediterranean, Spain), showing a storage effect by submarine canyons on coastal resting stage dynamics, driven by downwelling phenomena. The interactions between oceanographic and life cycle patterns is a neglected field in marine ecology; the aim of present work is to evaluate the presence of plankton-originated resting stages on the surface of deep Mediterranean sediments to ascertain their possible role in plankton-benthos coupling in off-shore areas.…”

Section: Introductionmentioning

confidence: 99%

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Resting stage in the biogenic fraction of surface sediments from the deep Mediterranean Sea

Tommasa¹,

Danovaro²,

Belmonte³

et al. 2004

Sci. Mar.

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SUMMARY:The presence of resting stages in neritic areas is well known, while their occurrence in the deep sea realm has seldom been considered. Recent investigations showed strict interactions between neritic and deep sea domains, due to upand down-welling phenomena driven by submarine canyons. To estimate the presence of resting stages in deep bottom sediments, seven sediment cores, collected along a trans-Mediterranean transect by means a multi-corer during the TRANSMED survey (1999), were studied. Most biogenic sediment was composed of Foraminifera tests (tens of thousand tests cm -3 ), Calciodinellum albatrosianum and Leonella granifera (Dinophyta) cysts (up to thousands cysts cm -3 ). Eleven dinocyst morphotypes were recorded mainly as empty shells (seven calcareous-walled: C. albatrosianum, Calciperidinium asymmetricum, Leonella granifera, Scrippsiella trochoidea, S. precaria type 1, S. precaria type 2, S. regalis; four organicwalled: Impagidinium aculeatum, unid. dinocyst 1, unid. dinocyst 2 and unid. dinocyst 3), while no metazoan resting eggs were observed. The presence of viable resting stages in deep bottom surface sediments was much lower than in neritic areas, suggesting that oceanic species do not produce cysts for a "benthic resting" strategy. Further taxonomic and biogeographic studies are needed to better understand the ecological dynamics of oceanic plankton in the Mediterranean Sea.Key words: resting stages, deep sea, Mediterranean, biogenic sediments, cyst morphology. RESUMEN: ABUNDANCIA DE ESTADIOS QUIESCENTES EN LA FRACCIÓN BIOGÉNICA DE SEDIMENTOS SUPERFICIALES DEL MAR MEDITERRÁNEO PROFUNDO. -La presencia de estadios quiescentes en áreas neríticas es bien conocida, pero su presencia en fondos profundos raramente se considera. Investigaciones recientes han demostrado interacciones estrictas entre los ámbi-tos nerítico y profundo, debido a fenómenos de afloramiento y hundimiento mediados por los cañones submarinos. Para estimar la presencia de estadios quiescentes en sedimentos profundos se estudiaron siete testigos de sedimento, obtenidos durante el proyecto TRANSMED a lo largo de un transecto transmediterráneo. utilizando un tomatestigos múltiple. La mayor parte de sedimento biogénico estaba compuesto por caparazones de foraminíferos (decenas de miles de caparazones cm -3 ), cistes de Calciodinellum albatrosianum y Leonella granifera (Dinófitos; hasta miles de cistes cm -3 ). Se registraron once morfotipos de dinocistes principalmente como caparazones vacíos (siete con paredes calcáreas: C. albatrosianum, Calciperidinium asymmetricum, Leonella granifera, Scrippsiella trochoidea, S. precaria tipo 1, S. precaria tipo 2, S. regalis; cuatro con paredes orgánicas: Impagidinium aculeatum, dinociste no identificado 1, dinociste no id. 2 y dinociste no id. 3), mientras que no se observaron huevos de reposo de metazoos. La presencia de estadios quiescentes viables en sedimentos superficiales profundos fue mucho menor que en áreas neríticas, lo que sugiere que las especies oceánicas no producen ciste...

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“…This phenomenon is known from neritic regions, in which accumulation areas of resting stages are present. From there they can be brought up to the surface water triggered by currents or upwelling (Tommasa et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Tropical phytoplankton community development in mesocosms inoculated with different life stages

Härnström

Godhe²,

Saravanan³

et al. 2007

Mar. Ecol. Prog. Ser.

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Many diatom species have the ability to form benthic resting stages, but the importance of these stages as a supply for planktonic blooms is uncertain. A mesocosm study was carried out in December 2005 to January 2006 in Mangalore, India. Mesocosms were inoculated with various combinations of benthic and/or planktonic cells, sampled from the coastal SE Arabian Sea, and the development of the planktonic community was followed. Diatoms dominated the phytoplankton community in all mesocosms, irrespective of inoculum. The most significant differences among inoculum types were altered species composition, and the timings of the maximum cell abundances, which lagged behind in the sediment mesocosms. Populations of Thalassiosira were initiated by both plankton and benthic propagules. Taxa known from temperate coastal areas to seed bloom by benthic propagules, such as Chaetoceros and Skeletonema, were predominantly seeded by planktonic cells in this experiment; this implies differential seeding strategy within the same species at different latitudes. The species assemblage encountered in the plankton and sediment was similar, which indicates that the benthic resting stages seed an autochthonous phytoplankton flora in the area. High species diversity in all inoculated mesocosms was maintained throughout the experimental period, although the actual number of species was fewer at the end. The hydrographic conditions and timing of formation, survival, and germination of diatom resting stages in SE Arabian Sea are discussed.

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Resting stages in a submarine canyon: a component of shallow-deep-sea coupling?

Cited by 9 publications

References 13 publications

Deep-sea heterotrophic nanoflagellates of the Eastern Mediterranean Sea: qualitative and quantitative aspects of their pelagic and benthic occurrence

Deep-sea heterotrophic nanoflagellates of the Eastern Mediterranean Sea: qualitative and quantitative aspects of their pelagic and benthic occurrence

Resting stage in the biogenic fraction of surface sediments from the deep Mediterranean Sea

Tropical phytoplankton community development in mesocosms inoculated with different life stages

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