Abstract
AbstractIn the past decade,Sargassum natansandS. fluitanshave massively reached the Mexican Caribbean shores. As a result,Sargassumconfinement sites may be affecting the soil quality and health in coastal ecosystems and agroecosystems. The impact ofSargassum(e.g., polyphenols) on soil biodiversity has not yet been evaluated. Terrestrial ecotoxicological tests use the epigean earthwormEisenia fetidaas a model organism to assess the function of soil habitats. This study evaluated the behavior and survival of the earthwormE. fetidaexposed to fiveSargassumconcentrations (0, 25, 50, 75, and 100 %) using two toxicological tests. The avoidance test showed thatE. fetidarepelled (>80 %) a diet with 100 %Sargassum. In contrast, the acute test recorded a low mortality; however, the growth ofE. fetidawas lower with increasingSargassumconcentrations. It is concluded that the ability to repel andE. fetidabiomass are early warning bioindicators to predict the environmental risk ofSargassumin soil. Therefore, it is relevant to determine the potential risk of using earthworm compost andSargassumleachates as biofertilizers in agroecosystems.
Publisher
Cold Spring Harbor Laboratory
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