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Mireille Peyrotclausade - One of the best experts on this subject based on the ideXlab platform.
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ingestion and transformation of algal turf by echinometra mathaei on tiahura fringing reef french polynesia
Journal of Experimental Marine Biology and Ecology, 2000Co-Authors: Suzanne C Mills, Mireille PeyrotclausadeAbstract:Abstract The sea urchin Echinometra mathaei is the most abundant herbivore on many tropical reefs. We studied the ingestion and digestion diel rhythms, transformation of algal turf and Bioerosion attributable to this species on the Tiahura fringing reef in French Polynesia. Ingestion rates showed a circadian rhythm with most feeding taking place during the night. Absorption of food occurred throughout the day with urchins digesting food outside of the feeding period. A total of 73% of the faecal pellets consisted of CaCO 3 eroded from the reef, 20% consisted of organic matter and 7% the refractory organic matter. Of the organic matter, lipids, carbohydrates and chlorophyll were digested and absorbed and proteins were expelled in the faecal pellets. An average individual Bioerosion of 0.32 g day −1 was estimated for E. mathaei from approximately a 35-mm test diameter on the Tiahura fringing reef. We further estimated that E. mathaei release 70.5 g m 2 y −1 of carbohydrates, 43.8 g m 2 y −1 of lipid, 23.3 g m 2 y −1 of protein and 2.0 g m 2 y −1 of total chlorophyll pigments.
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sea urchin and fish Bioerosion on la reunion and moorea reefs
Bulletin of Marine Science, 2000Co-Authors: Mireille Peyrotclausade, Chantal Conand, M F Fontaine, Pascale Chabanet, Yves Letourneur, Mireille HarmelinvivienAbstract:Sea urchins and scarid fishes were the most important grazers on the two reefs of La Saline on La Reunion Island (Indian Ocean) and of Tiahura on Moorea Island (French Polynesia). The total erosive activity of grazers reached a similar maximum value of 8 kg CaCO 3 m -2 yr -1 on these two high island reefs. The rates of Bioerosion by grazers varied considerably among reef habitats and were linked to the main species of bioeroders. The urchin Echinometra mathaei was the only important grazer on La Reunion reef flats, when on Moorea Diadema savignyi and Echinothrix spp. played an important role on Bioerosion on the barrier reef flat, and Chlorurus sordidus (scarid fish) and Echinometra mathaei were very active on the fringing reef.
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Bioerosion rates on coral reefs interactions between macroborers microborers and grazers moorea french polynesia
Palaeogeography Palaeoclimatology Palaeoecology, 1995Co-Authors: V Chazottes, Mireille Peyrotclausade, Le T CampionalsumardAbstract:Abstract A two-year experimental study of Bioerosion at Moorea Island, French Polynesia, clearly demonstrated the importance of microborers in the initial stages of the establishment of infaunal boring communities. Rates of erosion by micro- and macroborers and by grazers were estimated from measurements of carbonate removal from experimental substrates, using Image Analysis. The studied substrates have been exposed for 2, 6, 12 and 24 months. After 2 months of exposure, the only borers present in the substrates were cyanobacteria and one chlorophyte (Phaeophila sp.) and their Bioerosion rate was estimated at 0.6 kg CaCO3 m−2 yr−1. In the course of the 2 years of exposure, recruitment of macroborers occurred and their estimated rates of erosion increased during this period from 2.15 to 90g CaCO3 m−2 yr−1. Carbonate removal by grazers was the dominant agent of erosion, responsible for 89% of the total Bioerosion: 2.6 kg CaCO3 m−2 yr−1, as recorded in substrates exposed for 2 years. The measurable rates of Bioerosion by microborers apparently decreased with the time of exposure from 0.6 to 0.2 kg m−2 yr−1, but these values are underestimations which need to be corrected by including the intensity of microboring in substrate layers removed by grazing. Bioerosion is dependent on numerous environmental factors such as depth, light availability, and nutrient supply. A good knowledge of Bioerosional processes in modern environments could highlight Bioerosion significance in the fossil record.
Pau Balaguer - One of the best experts on this subject based on the ideXlab platform.
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exploring rock coast Bioerosion rock fragment intestine transit time and erosion rates computation of the gastropod monodonta articulata lamarck 1822
Journal of Coastal Research, 2013Co-Authors: Maria Vidal, Joan J. Fornós, Miquel Palmer, Lluis Gomezpujol, Guillem X Pons, Pau BalaguerAbstract:ABSTRACT Vidal, M., Fornos, J.J., Gomez-Pujol, L., Palmer, M., Pons, G.X., Balaguer, P., 2013. Exploring rock coast Bioerosion: rock fragment intestine transit time and erosion rates computation of the gastropod Monodonta articulata (Lamarck, 1822) Coastal rock Bioerosion research is well established. Otherwise there is the need to improve the way in which Bioerosion rates are calculated. Since the findings of McLean (1967), it has been assumed that the dry weight of pellets collected after 24 hours provides an estimate of the amount of organism daily erosion. This is an assumption that relies largely on initial experimental procedures lacking any empirical ascertainment. This paper assess what is the transit time of the rock fragments through the intestine of the gastropod Monodonta articulata, and the implications of applicability of this temporal framework to the computation of a more precise estimation of the Bioerosion throughout laboratory experiments. Our results suggest that for the gastropod Mono...
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exploring rock coast Bioerosion rock fragment intestine transit time and erosion rates computation of the gastropod monodonta articulata lamarck 1822
Journal of Coastal Research, 2013Co-Authors: Maria Vidal, Joan J. Fornós, Miquel Palmer, Lluis Gomezpujol, Guillem X Pons, Pau BalaguerAbstract:ABSTRACT Vidal, M., Fornos, J.J., Gomez-Pujol, L., Palmer, M., Pons, G.X., Balaguer, P., 2013. Exploring rock coast Bioerosion: rock fragment intestine transit time and erosion rates computation of the gastropod Monodonta articulata (Lamarck, 1822) Coastal rock Bioerosion research is well established. Otherwise there is the need to improve the way in which Bioerosion rates are calculated. Since the findings of McLean (1967), it has been assumed that the dry weight of pellets collected after 24 hours provides an estimate of the amount of organism daily erosion. This is an assumption that relies largely on initial experimental procedures lacking any empirical ascertainment. This paper assess what is the transit time of the rock fragments through the intestine of the gastropod Monodonta articulata, and the implications of applicability of this temporal framework to the computation of a more precise estimation of the Bioerosion throughout laboratory experiments. Our results suggest that for the gastropod Mono...
Garfield T Kwan - One of the best experts on this subject based on the ideXlab platform.
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acid secretion by the boring organ of the burrowing giant clam tridacna crocea
Biology Letters, 2018Co-Authors: Richard W Hill, Eric J Armstrong, Kazuo Inaba, Masaya Morita, Martin Tresguerres, Jonathon H Stillman, Garfield T KwanAbstract:The giant clam Tridacna crocea , native to Indo-Pacific coral reefs, is noted for its unique ability to bore fully into coral rock and is a major agent of reef Bioerosion. However, T. crocea 9s mechanism of boring has remained a mystery despite decades of research. By exploiting a new, two-dimensional pH-sensing technology and manipulating clams to press their presumptive boring tissue (the pedal mantle) against pH-sensing foils, we show that this tissue lowers the pH of surfaces it contacts by greater than or equal to 2 pH units below seawater pH day and night. Acid secretion is likely mediated by vacuolar-type H + -ATPase, which we demonstrate (by immunofluorescence) is abundant in the pedal mantle outer epithelium. Our discovery of acid secretion solves this decades-old mystery and reveals that, during Bioerosion, T. crocea can liberate reef constituents directly to the soluble phase, rather than producing sediment alone as earlier assumed.
Eric J Armstrong - One of the best experts on this subject based on the ideXlab platform.
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acid secretion by the boring organ of the burrowing giant clam tridacna crocea
Biology Letters, 2018Co-Authors: Richard W Hill, Eric J Armstrong, Kazuo Inaba, Masaya Morita, Martin Tresguerres, Jonathon H Stillman, Garfield T KwanAbstract:The giant clam Tridacna crocea , native to Indo-Pacific coral reefs, is noted for its unique ability to bore fully into coral rock and is a major agent of reef Bioerosion. However, T. crocea 9s mechanism of boring has remained a mystery despite decades of research. By exploiting a new, two-dimensional pH-sensing technology and manipulating clams to press their presumptive boring tissue (the pedal mantle) against pH-sensing foils, we show that this tissue lowers the pH of surfaces it contacts by greater than or equal to 2 pH units below seawater pH day and night. Acid secretion is likely mediated by vacuolar-type H + -ATPase, which we demonstrate (by immunofluorescence) is abundant in the pedal mantle outer epithelium. Our discovery of acid secretion solves this decades-old mystery and reveals that, during Bioerosion, T. crocea can liberate reef constituents directly to the soluble phase, rather than producing sediment alone as earlier assumed.
Jonathon H Stillman - One of the best experts on this subject based on the ideXlab platform.
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acid secretion by the boring organ of the burrowing giant clam tridacna crocea
Biology Letters, 2018Co-Authors: Richard W Hill, Eric J Armstrong, Kazuo Inaba, Masaya Morita, Martin Tresguerres, Jonathon H Stillman, Garfield T KwanAbstract:The giant clam Tridacna crocea , native to Indo-Pacific coral reefs, is noted for its unique ability to bore fully into coral rock and is a major agent of reef Bioerosion. However, T. crocea 9s mechanism of boring has remained a mystery despite decades of research. By exploiting a new, two-dimensional pH-sensing technology and manipulating clams to press their presumptive boring tissue (the pedal mantle) against pH-sensing foils, we show that this tissue lowers the pH of surfaces it contacts by greater than or equal to 2 pH units below seawater pH day and night. Acid secretion is likely mediated by vacuolar-type H + -ATPase, which we demonstrate (by immunofluorescence) is abundant in the pedal mantle outer epithelium. Our discovery of acid secretion solves this decades-old mystery and reveals that, during Bioerosion, T. crocea can liberate reef constituents directly to the soluble phase, rather than producing sediment alone as earlier assumed.