UNASSIGNED: We studied a complete Holocene sediment record from shallow (zmax = 9.7 m) Lake Harris, Florida (USA) to infer the historical development of the lake and its current eutrophic status. We used 210Pb and 14C to date the 5.9-m sediment sequence (core LH-6-13) and determined accumulation rates for bulk sediment, organic matter, @entity4959 , @entity3151 fractions and biogenic @entity3440 fractions. The chronology of changes in sediment characteristics for LH-6-13 is consistent with the general paleoenvironmental framework established by core studies from other Florida lakes. Lake Harris began to fill with water in the early Holocene, ca. 10,680 cal a BP. A shift from @entity6445 -dominated to organic-rich sediments ca. 5,540 cal a BP corresponds to a transition to wetter climate in the middle Holocene. A rapid increase in diatom biogenic @entity3440 concentrations and accumulation rates ca. 2,600 cal a BP signals that the lake had deepened to its modern limnetic state. In LH-6-13, an up-core decrease in rates of accumulation for several sediment variables indicates time-course oligotrophication of the lake through the Holocene. In near-surface sediments, abrupt increases in the accumulation rates of these same variables indicate progressive cultural eutrophication after ca. @entity195 1900. Comparison of the modern state of Lake Harris to its condition 50-100 years ago provides a measure of the impact of recent cultural eutrophication. Because the pre-disturbance trajectory of this lake was one of oligotrophication, the true impact of cultural eutrophication is even greater than what is inferred from the changes over the past century.

A Holocene Sediment Record of XXXX Accumulation in Shallow Lake Harris, Florida (USA) Offers New Perspectives on Recent Cultural Eutrophication.

@entity6445 :: ('CHEBI:41609', 'Chemical') :: ['carbonate'] @entity4959 :: ('MESH:D002119', 'Chemical') :: ['calcium carbonate'] @entity3440 :: ('MESH:D012822', 'Chemical') :: ['silica'] @entity195 :: ('MESH:D000544', 'Disease') :: ['AD'] @entity3151 :: ('MESH:D010758', 'Chemical') :: ['phosphorus']
@entity3151 :: (MESH:D010758,Chemical) :: ['Phosphorus']
