Isotopic Determination of Food Sources ofCrassostrea gigasAlong a Trophic Gradient in the Estuarine Bay of Marennes-Ol éron

Riera, Pascal; Richard, Pierre

doi:10.1006/ecss.1996.0023

Cited by 289 publications

(209 citation statements)

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“…Stable isotopic analysis is very useful for estimation of food cascade in the benthic community (Riera & Richard 1996). However, it would be impossible to distinguish diatom species consumed by oyster and clam.…”

Section: Discussionmentioning

confidence: 99%

“…The high concentration of phytoplankton in the field can lead to an increase in suspension activity of bivalve populations and this may have a major effect on phytoplankton abundance (Iglesias et al 1996, Barille et al 2003. Analysis of stable isotopic carbon has also shown that "phytoplankton" can be a main food source of oyster and clam (Koike & Nakajima 1989, Riera & Richard 1996, Hsieh et al 2000, Yokoyama & Ishii 2003, Kasai et al 2004). However, many benthic species of diatoms were found in "phytoplankton" assemblages (Facca et al 2002, Kasim & Mukai 2006, Perissinotto et al 2002.…”

Section: Introductionmentioning

confidence: 99%

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Food sources of the oyster (Crassostrea gigas) and the clam (Ruditapes philippinarum) in the Akkeshi-ko estuary

Kasim

Mukai

2009

Plankton Benthos Res

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Abstract:The gut content was analyzed in order to clarify the potential food sources of the oyster (Crassostrea gigas) and the clam (Ruditapes philippinarum) in the Akkeshi-ko estuary. Benthic diatoms in the diets of oysters were most abundant and accounted for 70% in 2003 and 67% in 2004, followed by pelagic diatoms and dinoflagellates. In gut of clams, benthic diatoms represented 78% in 2003 and 87% in 2004, also followed by pelagic diatoms and dinoflagellates. There are no differences in dietary preference between oyster and clam. There are no significant correlations between phytoplankton compositions in gut of oyster/clam and water column. The Index of electivity was high particularly in dinoflagellates and several species of benthic diatoms such as Amphora sp., Cocconeis scutellum, Nitzschia sp., Paralia sulcata, Rhoicophenia curvata and Thallasiosira sp., Gramatophora marina, and so on.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Food sources of the oyster (Crassostrea gigas) and the clam (Ruditapes philippinarum) in the Akkeshi-ko estuary

Kasim

Mukai

2009

Plankton Benthos Res

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“…Fish prey were then collected along the mangrove fringe in SH and HL ponds as well as in seagrass beds (SB) located outside the ponds (Fig.1). Microphytobenthos (MPB), mainly composed of benthic diatoms, was collected following the method of Riera & Richard (1996). Plant material (litter, algae, epiphytes of seagrass leaves) and invertebrates (crustaceans, gastropods and annelids) were collected using hand nets and light traps ( (Post et al, 2007).…”

Section: Methodsmentioning

confidence: 99%

Dietary habits of juveniles of the Mayan cichlid, Cichlasoma urophthalmus, in mangrove ponds of an offshore islet in Belize, Central America

Vaslet¹,

France²,

Baldwin³

et al. 2012

Neotrop. ichthyol.

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Foraging habitats of juveniles of the Mayan cichlid, Cichlasoma urophthalmus (Günther, 1862), were investigated in two mangrove ponds located in Twin Cays offshore islet in Belize: Sink Hole pond (SH) and Hidden Lake pond (HL). Sink Hole pond is a semiclosed body of water, whereas Hidden Lake pond is connected by a channel to adjacent seagrass beds that surround the islet. Gut contents of 21 juvenile C. urophthalmus (9.8-13.2 cm total length) were analyzed, and five prey taxa were identified. In both mangrove ponds, C. urophthalmus were opportunistic carnivores and consumed primarily crustaceans. Plant material and detritus present in gut contents were most likely ingested incidentally when the fish foraged on small invertebrates. Carbon isotopic values of fish specimens from the two ponds were similar (mean ± SD of -19.2 ± 0.4‰ in SH and -19.4 ± 0.4‰ in HL), and were close to those of mangrove prey (mean ± SD = -20.2 ± 1.5‰), suggesting that this fish species forages in this habitat. Mixing models showed a higher contribution of mangrove food sources to the fish diet than seagrass food sources. This study reveals that young Mayan cichlids, inhabiting two Belize mangrove ponds, are generalists and opportunistic carnivores that forage on mangrove food sources and do not appear to move to adjacent seagrass beds to complement their diets. Understanding trophic linkages between aquatic consumers and food resources may contribute to better management of threatened coastal ecosystems.Habitats de alimentação de juvenis do ciclídeo-maia, Cichlasoma urophthalmus (Günther, 1862), foram investigados em duas lagoas de mangue localizadas nas ilhas Twin Cays em alto mar em Belize: Sink Hole Lake (SH) e Hidden Lake (HL). Sink Hole é um corpo d'água parcialmente isolado, enquanto Hidden Lake é ligada por um canal com bancos de sargaços que cercam a ilhota. O conteúdo estomacal de 21 juvenil de C. urophthalmus (9,8-13,2 cm de comprimento total) foram analisados e cinco táxons de presas foram identificados. Em ambas as lagoas de mangue, 'C.' urophthalmus foram carnívoros oportunistas e consumiram principalmente crustáceos. Material vegetal e detritos presentes no conteúdo digestivo foram provavelmente ingeridos acidentalmente quando o peixe se alimentava de pequenos invertebrados. Os valores de isótopos estáveis do carbono em espécimes de peixes das duas lagoas foram semelhantes (média ± SD -19,2 ± 0,4 ‰ em SH e -19,4 ± 0,4 ‰ em HL), e foram próximos aos de presas de mangue (mean ± SD = -20.2 ± 1.5 ‰), sugerindo que esta espécie de peixe vai à procura de alimentos neste habitat. Modelos mistos mostraram uma maior contribuição de fontes alimentares de mangue para a dieta dos peixes do que de fontes alimentares de algas marinhas. Este estudo revela que juvenis do ciclídeo-maia que habitam duas lagoas de mangue em Belize, são carnívoros generalistas e oportunistas que se ingerem alimentos dos manguezais e não parecem se mover para leitos de algas marinhas adjacentes para complementar suas dietas. Compreender as ligações tróficas ent...

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“…The continuing import of terrigenous mud and nutrients led to a perturbation of the carbonate production. The abundance of Nanogyra sp., the dark colour of the marls, and the common occurrence of plant remains imply high benthic food levels probably fuelled by the removal of soil and vegetation cover during transgression (Riera and Richard, 1996). In the lower NeNaS, marl sedimentation terminated gradually and oyster-rich lagoonal limestones persist above the last marl bed for some metres, before coral limestones indicate a return to shallow-marine oligotrophic conditions (Jank et al, 2006c).…”

Section: Role Of Paleosols Within the Facies Successionmentioning

confidence: 99%

The lost paleosols: Masked evidence for emergence and soil formation on the Kimmeridgian Jura platform (NW Switzerland)

Waite

Marty²,

Strasser

et al. 2013

Palaeogeography, Palaeoclimatology, Palaeoecology

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Lagoonal carbonates of Kimmeridgian age in NW Switzerland formed in a tropical epeiric sea and exhibit indicators of subaerial emergence such as tidal biolaminites, desiccation cracks, flat pebble conglomerates, and fenestral structures. Additionally, 30 dinosaur tracksites from at least six stratigraphic intervals indicate repeated formation of land bridges between the platform and adjacent massifs. Populations of herbivorous and carnivorous dinosaurs necessitate substantial vegetation and consequently a soil cover, but no striking evidence of paleosols have been found within the track bearing sequences. However, two stratigraphic levels exposed in nine outcrops exhibit distinctive hardgrounds that experienced early meteoric diagenesis during times of emergence. Initial induration began with the precipitation of thin micritic meniscus cements. Contemporaneously meteoric waters completely dissolved all aragonite leaving large voids. Iron-hydroxides were precipitated in the uppermost 7-10 cm where they impregnated the porous micrite and constituted a separate cement generation, which caused a penetrative dark red staining. These aspects are suggestive of the formation of Mediterranean-type red soils on the emerged platform. During transgression, the soil was eroded and wavecut hardgrounds were superimposed on the hardgrounds formed during regression. Erosion is evidenced by micro-karst, truncated Gastrochaenolites isp. borings and the physical removal of steinkerns. The eroded material including floral remains provided surplus nutrients leading to eutrophication. This food-rich environment supported the mass-occurrence of gastropods in the nerineoid limestones and oysters (Nanogyra sp.) in the Virgula Marls.

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Isotopic Determination of Food Sources ofCrassostrea gigasAlong a Trophic Gradient in the Estuarine Bay of Marennes-Ol éron

Cited by 289 publications

References 0 publications

Food sources of the oyster (Crassostrea gigas) and the clam (Ruditapes philippinarum) in the Akkeshi-ko estuary

Food sources of the oyster (Crassostrea gigas) and the clam (Ruditapes philippinarum) in the Akkeshi-ko estuary

Dietary habits of juveniles of the Mayan cichlid, Cichlasoma urophthalmus, in mangrove ponds of an offshore islet in Belize, Central America

The lost paleosols: Masked evidence for emergence and soil formation on the Kimmeridgian Jura platform (NW Switzerland)

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