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Title

Silicon utilization by sponges: an assessment of seasonal changes

AuthorsLópez-Acosta, María ; Leynaert, Aude; Coquille, Valérie; Maldonado, Manuel
KeywordsSiliceous sponges
Seasonal variability
Silicic acid
Silicon consumption kinetics
Issue Date2018
PublisherInter Research
CitationMarine Ecology Progress Series 605 : 111-123 (2018)
AbstractAwareness that sponges are relevant silicic acid (DSi) users is growing; however, understanding how their DSi consumption kinetics perform is still limited. We investigated the effects that seasonal changes in a temperate ecosystem (Bay of Brest, France) have on the DSi consumption of 2 dominant sponge species: Hymeniacidon perlevis and Tethya citrina. The results indicated that while both species increased their rate of DSi utilization with DSi availability following saturable Michaelis-Menten kinetics, only the kinetics of T. citrina shifted seasonally. This species consumed DSi at a higher rate in autumn than in summer. Surprisingly, the increase in DSi utilization did not involve an increase in net affinity for DSi but rather augmentation of both the half-saturation concentration and the maximum velocity of transport characterizing the kinetics. By quantifying the biomass of the 2 sponge species in the bay and the monthly availability of DSi over an annual cycle, a yearly DSi consumption of 2.50 ± 3.21 × 106 mol Si was calculated for their populations. The oversight of the seasonal kinetic change would introduce inaccuracies of 10% into the global DSi consumption budget of the bay. Because the seasonal kinetic differences increased enormously with increasing DSi availability, the relevance of the kinetic shift into the budgets could increase to >30% for sponge assemblages other than those in the bay whenever they are characterized by higher DSi availability, as is typically occurring at high latitudes and in the deep sea.
DescriptionEste artículo contiene 13 páginas, 6 figuras, 1 tabla.
Publisher version (URL)https://doi.org/10.3354/meps12752
URIhttp://hdl.handle.net/10261/172616
ISSN0171-8630
E-ISSN1616-1599
Appears in Collections:(CEAB) Artículos
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