Temporal trends of organic carbon accumulation in seagrass meadows from the northern Mexican Caribbean

•Corg burial was evaluated in seagrass sediments at the northern Mexican Caribbean.•Thalassia testudinum seagrass meadows showed Corg storage within ~ 40 to ~ 100 years.•Corg stock increments were related with increasing sediment accumulation rates.•Seagrasses might be gradually impacted by population growth and land use changes.