Data/hora: 16/06/2024 06:39:56

Provedor de dados: | 5
País: | France
Título: | Trophic role of large benthic sulfur bacteria in mangrove sediment
Autores: | Pascal, Pierre-yves; Dubois, Stanislas; Boschker, Henricus T. S.; Gros, Olivier.
Data: | 2014-12-03
Ano: | 2014
Palavras-chave: | Beggiatoa; Mangrove; Benthic food web; Sulfur bacteria; Meiofauna; Nematode; Rotifers; Stable isotope.
Resumo: | Large filamentous sulfur-oxidizing bacteria belonging to the Beggiatoacae family can cover large portions of shallow marine sediments surrounding mangroves in Guadeloupe (French West Indies). In order to assess the importance of Beggiatoa mats as an infaunal food source, observations were conducted of the area within mats and at increasing distances from mats. We used natural isotopic compositions and a C-13 enrichment study. Both revealed an ingestion of bacterial mats by associated meiofauna, dominated by rotifers and to a smaller extent by small polychaetes and nematodes. Compared to adjacent sites, sediment covered by bacterial mats presented a higher abundance of diatoms, whereas the total biomass of bacteria did not vary. This constant bacterial abundance suggests that the proportion of organic matter represented by sulfur bacteria is limited compared to the fraction of total bacteria. There was no significant difference in infaunal abundance in mats, suggesting that the availability of this chemosynthetic food resource had a limited local effect. Grazers presented a delta C-13 value increasing with distance from the mat. However, isotopic composition of phospholipid-derived fatty acids specific for diatoms and bacteria revealed that this change is related to modifications of delta C-13 dietary components rather than to changes in diet composition. These complementary methods revealed that the occurrence of sulfur-oxidizing bacterial mats does not necessarily affect grazer abundance and importance of bacteria in their diet. Despite its wide occurrence, Beggiatoa mats would consequently have a minor influence on the structure of the mangrove food web.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00248/35919/34449.pdf

https://archimer.ifremer.fr/doc/00248/35919/34463.pdf

DOI:10.3354/meps11035

https://archimer.ifremer.fr/doc/00248/35919/

Editor: | Inter-Research
Formato: | application/pdf
Fonte: | Marine Ecology Progress Series (0171-8630) (Inter-Research), 2014-12-03 , Vol. 516 , P. 127-138

Fonte:

Inter-Research 2014

info:eu-repo/semantics/openAccess

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