National Parks: Acadia National Park (ANP) and Cape Cod National Seashore (CCNS), to fill an important spatial gap in Hg deposition records and to explore changing sources of Hg and processes affecting Hg accumulation in these coastal sites. Mercury (Hg) deposition was reconstructed in sediment cores from lakes in two coastal U.S. The results indicate that where influxes are high enough, pollen can have a stimulatory effect on phytoplankton communities and is a short-term nutrient subsidy in these systems at a time of year (May-June) when warming temperatures and faster growth rates elevate the demand for nutrients. This study examines in vivo chlorophyll fluorescence responses of surface-water samples collected from three such lakes within Cape Cod National Seashore (Wellfleet and Truro) to additions of P. In Cape Cod (Massachusetts, USA), large amounts of pollen from dense pitch pine (Pinus rigida L.) forest are deposited in late spring into small, freshwater lakes (known locally as kettle ponds) scattered across the landscape. Plant pollen, which upon degradation releases nutrients into the water column, is one such source of allochthonous material. Carbon, nitrogen, and phosphorus in this material can significantly influence the planktonic communities of these systems, especially where there is a large proportion of contributing area relative to waterbody size and where nutrients are generally in short supply. Terrestrial ecosystems contribute many different forms of organic matter to adjacent waterbodies.
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