Organic stocks (on average 1 %–4 % in 2000–2020) but contributesĬonsiderably to benthic–pelagic fluxes of inorganic C (23 %–31 %), N Indicate that benthic fauna makes up a small portion of seafloor active

Analyses of simulation results from the Baltic Proper and Gulf of Riga Growth and metabolism and the indirect effects of its bioturbatingĪctivities on biogeochemical fluxes of and transformations between organicĪnd inorganic forms of carbon (C), nitrogen (N), phosphorus (P) and oxygen We include both the direct effects of faunal Long-term and large-scale effects of benthic fauna on nutrient and carbonĬycling in the Baltic Sea. Into a physical–biogeochemical ecosystem model (BALTSEM) to study the

Here we merge a model of benthic fauna (BMM) Sediments devoid of fauna therefore function differently and are less efficient in processing organic matter with the consequence that more organic matter is buried and transferred from Vernadsky's biosphere to the geosphere.Įven though the effects of benthic fauna on aquaticīiogeochemistry have been long recognized, few studies have addressed theĬombined effects of animal bioturbation and metabolism on ecosystem–levelĬarbon and nutrient dynamics. I will present an inverted microbial loop in which microbes profit from bioturbation rather than animals profiting from microbial processing of otherwise lost dissolved organic resources. Animals impact sediment organic carbon processing by microbes in multiple ways: by governing organic carbon supply to sediments, by aeration via bio-irrigation and by mixing labile organic matter to deeper layers. Secondary production by microbes and animals is identified to potentially impact the composition of sedimentary organic matter. It will be shown that the biogeochemical approach (ignoring the identity of organisms) and the ecological approach (focussing on growth and biomass of organisms) are consistent on longer timescales. Here I review these disciplinary approaches and discuss where they agree and disagree. Organic carbon processing at the seafloor is studied by biogeochemists to quantify burial and respiration, by organic geochemists to elucidate compositional changes and by ecologists to follow carbon transfers within food webs.

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