Decrease in <i>Lithothamnion</i> sp. (Rhodophyta) primary production due to the deposition of a thin sediment layer

Riul, Pablo; Targino, Carlos Henrique; Farias, Julyana da Nóbrega; Visscher, Pieter T.; Horta, Paulo Antunes

doi:10.1017/s0025315408000258

Cited by 62 publications

(46 citation statements)

References 20 publications

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“…The present study provides the first quantitative demonstration that beds need not be exposed to threshold hydrodynamic conditions to avoid burial. It shows that beds can simply occur in areas where burial is unlikely to occur because of low sedimentation rates, in which case select resident bioturbators appear to suffice to maintain RSL below quantities that could alter rhodolith growth and survival (Wilson et al 2004, Hall-Spencer et al 2006, Riul et al 2008). …”

Section: Hydrodynamic Environmentmentioning

confidence: 99%

“…However, sessile benthic organisms, in particular primary producers such as seagrasses and seaweeds, are vulnerable to excessive sedimentation occluding feeding and photosynthetic structures or interfering with recruitment, growth, and gaseous or nutrient exchange with the water column (Thomsen & McGlathery 2006, Cabaço & Santos 2007, Riul et al 2008). …”

Section: Introductionmentioning

confidence: 99%

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Mechanisms of stability of rhodolith beds: sedimentological aspects

Millar¹,

Gagnon²

2018

Mar. Ecol. Prog. Ser.

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Rhodolith beds are highly diverse benthic communities organized around the physical structure and primary productivity of red coralline algae. Despite a worldwide distribution and growing recognition that rhodolith beds are important calcium carbonate (CaCO3) biofactories, little is known of the factors and processes that regulate their structure, function, and stability. One prevalent and largely untested paradigm is that beds develop in environments where water motion is strong enough to prevent burial by sediments.Observations over seven months and three weeks in the centre and near the upper and lower margins of a Newfoundland rhodolith (Lithothamnion glaciale) bed, as well as a laboratory mesocosm experiment with rhodoliths and dominant macrofauna from the bed, were used to characterize, parse, and model spatial and temporal variation in rhodolith sediment load (RSL) and movement among presumably important abiotic and biotic factors. RSL and movement were largely mediated by a few dominant benthic invertebrates. Hydrodynamic forces were insufficient to displace rhodoliths. Daisy brittle stars (Ophiopholis aculeata) and small common sea stars (Asterias rubens) contributed to dislodgement of sediment from rhodoliths. Large green sea urchins (Strongylocentrotus droebachiensis) easily displaced rhodoliths in mesocosms. Results provide the first quantitative demonstration that rhodolith beds need not be exposed to threshold hydrodynamic conditions to avoid burial. Beds can simply occur in areas where burial is unlikely because of low sedimentation rates. In such cases, select resident bioturbators operating simultaneously at different spatial scales (within and outside rhodoliths) appear to suffice to maintain RSL below lethal quantities, contributing to stability of beds.iii ACKNOWLEDGEMENTS

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Section: Hydrodynamic Environmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanisms of stability of rhodolith beds: sedimentological aspects

Millar¹,

Gagnon²

2018

Mar. Ecol. Prog. Ser.

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“…Dans la région du Cilento, la couverture totale par les algues corallines, vivantes et mortes, correspond à 13,96 km 2 , soit un total 316 800 tonnes de carbonate d'origine algaire dans le premier centimètre du fond marin, soit encore 20 430 g m -2 . Du maërl vivant, principalement constitué de branches 1997; Birkett et al 1998;Wilson et al 2004;Riul et al 2008). Maerl can be preserved in sub-fossil and fossil deposits that represent a carbonate reservoir (Boyd 1986;Scudeler Baccelle & Reato 1988;Birkett et al 1998;Toscano & Sorgente 2002;Basso et al 2008).…”

Section: Cartographie Du Maërl Et Quantification De La Production Carunclassified

Maerl-bed mapping and carbonate quantification on submerged terraces offshore the Cilento peninsula (Tyrrhenian Sea, Italy)

et al. 2012

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On the continental shelf off the Cilento peninsula (eastern Tyrrhenian Sea) the occurrence of more than 13 km 2 of maerl beds was documented through acoustic surveys. Swath bathymetric data along with a dense grid of chirp-sonar profiles were acquired over more than 180 km 2 . e maerl facies was characterized on the basis of the components analysis of 32 grab samples collected at selected sites. Mapped maerl-beds are predominant on submerged terraces located at variable water depth (wd) between 42 and 52 m. is preferred distribution on submerged terraces is probably associated with relatively vigorous bottom currents generated by local circulation that hinders the deposition of terrigenous sediments. Calcareous red algae result to be the most important producers of carbonates from 40 down to 60 m wd. We calculated the coralline carbonate accumulation from the percentage cover of coralline algae (thin section mapping) × 1 cm-thick layer of sediment × measured coralline density. e total coralline cover (living plus dead) in the Cilento area is 13.96 km 2 , with a total 316 800 tons of algal carbonate in the surface 1 cm layer, that correspond to 20 430 g m -2 . Living maerl is recorded at a depth of 47 m, with a live coralline

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“…Among them, M. erubescens (Foslie 1900b: 9) Me. Lemoine (1928: 252) is the species most studied in this region (Figueiredo & Steneck 2000, Nunes et al 2008, Bahia et al 2010, Horta et al 2011, being unquestionably ecologically important , Scherner et al 2010, Pascelli et al 2013) and under threat due to growing exploitation of South Atlantic rhodolith beds (Riul et al 2008) among other stressors including coastal pollution and climate change (Wilson et al 2004, Turra et al 2013.…”

Section: Introductionmentioning

confidence: 99%

Mesophyllum erubescens (Corallinales, Rhodophyta)—so many species in one epithet

et al. 2014

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The name Mesophyllum erubescens has been applied to protuberant rhodolith specimens which sometimes occur abundantly, as well as to encrusting specimens in tropical and temperate waters in the Western Pacific, Indian and Western Atlantic Oceans. A DNA sequence, representing about 20% of the rbcL gene, was obtained from the 140 year old holotype specimen collected in the Fernando de Noronha Archipelago by the Challenger Expedition. This sequence was identical to field-collected topotype specimens as well as to specimens ranging south along the coast of Brazil. Sequences for psbA from these same Brazilian specimens and specimens from the east coast of Mexico were identical or differed by 1 base pair. In contrast, specimens called M. erubescens based on morpho-anatomical characters in the Pacific Ocean differed from Western Atlantic Ocean specimens by 2.5-13.1%, indicating that these represent numerous distinct species. All reports of non-geniculate coralline species said to be widely distributed across different oceans or in different biogeographic provinces based on morpho-anatomical characters need to be verified by DNA sequences.

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Decrease in Lithothamnion sp. (Rhodophyta) primary production due to the deposition of a thin sediment layer

Cited by 62 publications

References 20 publications

Mechanisms of stability of rhodolith beds: sedimentological aspects

Mechanisms of stability of rhodolith beds: sedimentological aspects

Maerl-bed mapping and carbonate quantification on submerged terraces offshore the Cilento peninsula (Tyrrhenian Sea, Italy)

Mesophyllum erubescens (Corallinales, Rhodophyta)—so many species in one epithet

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