Terrestrial runoff may reduce microbenthic net community productivity by increasing turbidity: a Mediterranean coastal lagoon mesocosm experiment

摘要: Terrestrial runoff into aquatic ecosystems may have both stimulatory and inhibitory effects, due to nutrient subsidies increased light attenuation. To disentangle the effects of on microbenthos, we added soil coastal mesocosms manipulated substrate depth. test if fish interacted with presence. Soil decreased microphytobenthic chlorophyll-a per area carbon (C) unit, microbenthic phosphorous (P), reduced nitrogen (N) content. Depth had a strong effect shallow substrates exhibiting greater net ecosystem production, gross primary community respiration than deep substrates. Over time, micobenthic algae compensated for deeper depth through synthesis, but despite algal shade compensation, treatment still appeared reduce where microbenthos switched from autotrophy heterotrophy. Fish in affecting composition. presence C/P ratios only no treatment, probably since nutrients masked positive excreta microbenthos. N/P absence fish. Our study demonstrates importance composition productivity finds little evidence subsidy effects.