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Nutrient regeneration from feces and pseudofeces of mussel Mytilus edulis spat
van Broekhoven, W.; Jansen, H.; Verdegem, M.; Struyf, E.; Troost, K.; Lindeboom, H.; Smaal, A. (2015). Nutrient regeneration from feces and pseudofeces of mussel Mytilus edulis spat. Mar. Ecol. Prog. Ser. 534: 107-120. dx.doi.org/10.3354/meps11402
In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630, more
Peer reviewed article  

Available in  Authors 
    VLIZ: Open Repository 295587 [ OMA ]

Keywords
    Mytilus edulis Linnaeus, 1758 [WoRMS]; Marine
Author keywords
    Nutrient feedback; Nutrient regeneration; Mussel culture; Mussel spat;Biodeposits; Feces; Pseudofeces; Mytilus edulis

Authors  Top 
  • van Broekhoven, W.
  • Jansen, H.
  • Verdegem, M.
  • Struyf, E., more
  • Troost, K.
  • Lindeboom, H.
  • Smaal, A.

Abstract
    Suspension-feeding mussels exert top-down grazing control on primary producers, and provide bottom-up feedback of regenerated nutrients. Besides direct excretion, an important pathway of nutrient regeneration is through the decomposition of feces and pseudofeces, of which mussels can produce large quantities. Information on mussel feces and pseudofeces quality and nutrient regeneration rates is scarce. Feces and pseudofeces, produced in varying proportions, are commonly treated as one pool. We determined nutrient regeneration rates of feces and pseudofeces decomposition in incubations using natural seawater and juvenile Mytilus edulis from spat collectors. Apart from one 1993 trial, our results are the first to present nutrient regeneration dynamics of feces and pseudofeces separately. Dissolved inorganic nitrogen (DIN) and phosphate regeneration continued at stable rates for approximately 3 wk, after which 13.1 and 12.4% of the available N and 8.7 and 7.9% of the available P was regenerated from feces and pseudofeces, respectively. Rates of silicate regeneration declined continuously, which we attribute to its accumulation in the experimental setup. Coinciding environmental levels of DIN and silicate at growth-limiting levels indicate the potential ecological relevance of biodeposit decomposition. Overall DIN regeneration rates were similar between feces and pseudofeces, but depletion of ammonia was initially more rapid for pseudofeces due to stronger nitrification. Phosphate and silicate regeneration rates were 1.1 and 1.4 times greater from feces than pseudofeces, respectively. Future research should clarify the role of bivalve suspension feeders in controlling Si and P availability in coastal ecosystems in relationship to the proportion of pseudofeces generated, which depends on food concentration.

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