A5036576967- Coastal wetland ecosystem dynamics
- Isotope Analysis in Ecology
- Marine and coastal plant biology
- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Marine and fisheries research
- Marine Bivalve and Aquaculture Studies
- Soil and Water Nutrient Dynamics
- Coastal and Marine Management
- Aquatic Invertebrate Ecology and Behavior
- Fish Ecology and Management Studies
- Heavy metals in environment
- Aquatic Ecosystems and Phytoplankton Dynamics
- Groundwater and Isotope Geochemistry
- Subterranean biodiversity and taxonomy
- Ecology and Vegetation Dynamics Studies
- Peatlands and Wetlands Ecology
- Coastal and Marine Dynamics
- Microbial Community Ecology and Physiology
- Crustacean biology and ecology
- Geology and Paleoclimatology Research
- Mercury impact and mitigation studies
- Fish biology, ecology, and behavior
- Constructed Wetlands for Wastewater Treatment
- Animal Ecology and Behavior Studies
Marine Biological Laboratory
2015-2025
Woodwell Climate Research Center
2016
Boston University
1986-2015
Pacific Island Ecosystems Research Center
2010
United States Geological Survey
2010
National University of Mar del Plata
2002-2007
University of Virginia
2002
Brown University
2002
Iowa State University
2002
Tetra Tech (United States)
2000
T he mass media and scientific press have widely reported losses of tropical environments, such as felling rain forests bleaching coral reefs.This well-merited attention has created a worldwide constituency that supports conservation restoration efforts in both these threatened ecosystems.The remarkable degree public awareness support been manifested benefit rock concerts at Carnegie Hall the designation ice cream flavors after forest products.Mangrove are another important environment, but...
Macroalgal blooms are produced by nutrient enrichment of estuaries in which the sea floor lies within photic zone. We review features macroalgal pointed out recent literature and summarize work done Waquoit Bay Land Margin Ecosystems Research project suggests that loads, water residence times, presence fringing salt marshes, grazing affect blooms. Increases nitrogen supply raise N uptake rates, contents tissues, photosynthesis‐irradiance curves P max accelerate growth fronds. The resulting...
Nutrient enrichment as a result of anthropogenic activity concentrated along the land‐sea margin is increasing eutrophication near‐shore waters across globe. Management in coastal zone has been hampered by lack direct method to trace nitrogen sources from land into food webs. Stable isotope data series estuaries receiving loads 2 467 kg N ha −1 yr Waquoit Bay watershed, Cape Cod, Massachusetts, indicate that producer and consumer 15 N‐to‐ 14 ratios record increases wastewater inputs. Nitrate...
It is clear that anthropogenic nitrogen inputs from watersheds to estuaries stimulate eutrophication. has been difficult, however, explicitly link N entering found in estuarine producers. To explore this link, we compared stable isotope ratios of groundwater and producers the Waquoit Bay watershedestuary system, Cape Cod, Massachusetts. The δ 15 values nitrate within watershed increase −0.9‰ + 14.9‰ as wastewater contributions 4 86% total pool. As a result, average dissolved inorganic (DIN,...
In this paper we develop a model to estimate nitrogen loading watersheds and receiving waters, then apply the gain insight about sources, losses, transport of in groundwater moving through coastal watershed. The is developed from data Waquoit Bay Land Margin Ecosystems Research project (WBLMER), syntheses published information. WBLMER first estimates inputs by atmospheric deposition, fertilizer use, wastewater surfaces major types land use (natural vegetation, turf, agricultural land,...
Loss of eelgrass (Zostera marina) habitat from temperate estuaries worldwide often coincides with increased macroalgal accumulations resulting delivery anthropogenic nitrogen. We conducted enclosure/exclosure experiments during summer 1998 within populations in two Waquoit Bay, Massachusetts, USA, to evaluate how biomass affects density, recruitment, growth rate, and production eelgrass. One estuary featured a low nitrogen loading rate sustained relatively pristine population 2 cm high...
Root growth increased during the early growing season in Spartina alterniflora salt marsh plots. While fertilization with nitrogenous fertilizer did not affect initial growth, a marked decrease root biomass followed spring peak particularly where nutrient doses were highest. A sharp reduction roots occurred enriched areas covered by patens , although, as S. aboveground increased. Roots disappeared autumn leaving rhizomes only part of plants to overwinter. The maximum standing crop for was...
Spartina alterniflora oxidizes the sediments in which it grows through both passive oxygen release and active metabolic processes. Eh is higher root zone of this grass than sediment below or unvegetated sediments. Sediments underlying tall form S. alterniltorrt are more oxidized those under short form, redox condition production related a positive feedback loop. Reducing conditions inhibit aboveground production. But also, productive plants have greater capacity for oxidation, as shown by...
Waterborne nutrients enter Great Sippewissett Marsh through groundwater, rain, and tidal flooding. The ebb of water removes nutrients. During summer, uptake by marsh biota leads to net import increased export ammonium in August may be due leaching from senescent plants. There is a annual ammonium, nitrate, nitrite, dissolved organic (DON) particulate (PN) nitrogen, carbon (PC), phosphate. Ammonium, DON, PN are the major forms nitrogen exported. Nutrient concentrations coastal correlated,...
Abstract Receiving coastal waters and estuaries are among the most nutrient‐enriched environments on earth, one of symptoms resulting eutrophication is proliferation opportunistic, fast‐growing marine seaweeds. Here, we used a widespread macroalga often involved in blooms, Ulva spp., to investigate how supply nitrogen (N) phosphorus (P), two main potential growth‐limiting nutrients, influence macroalgal growth temperate tropical ranging from low‐ high‐nutrient supplies. We carried out N P...
The effect of nutrient enrichment red mangroves (Rhizophora mangle) was studied by comparing two mangrove—covered islands in the Indian River at Ft. Pierce, Florida, USA, one (high nutrient) with and (low without a breeding colony pelicans egrets. Repeated measurements taken on > 100 tagged branches each area revealed higher growth rates high site. Trees site showed greater additions (1) leaves; (2) reproductive parts; (3) new lateral branches; (4) larger increments to existing stems....
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 247:59-73 (2003) - doi:10.3354/meps247059 Eelgrass Zostera marina loss in temperate estuaries: relationship land-derived nitrogen loads and effect of light limitation imposed by algae Jennifer Hauxwell1,2,4,*, Just Cebrián1,3,5, Ivan Valiela1 1Boston University Program, Biological Laboratory, Woods Hole,...
ABSTRACT Increased anthropogenic delivery of nutrients to water bodies, both freshwater and estuarine, has caused detrimental changes in habitat, food web structure, nutrient cycling. Nitrogen‐stable isotopes may be suitable indicators such increased delivery. In this study, we looked at the differences response macrophyte δ 15 N values across different taxonomic groups geographic regions test a stable isotopic method for detecting impacts. Macrophyte with wastewater input water‐column...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 168:259-271 (1998) - doi:10.3354/meps168259 Changes in food web structure under influence of increased anthropogenic nitrogen inputs estuaries James W. McClelland*, I. Valiela Boston University Program, Biological Laboratory, Woods Hole, Massachusetts 02543, USA *E-mail: jmccle@bio.bu.edu ABSTRACT:...
Increases in nutrient supply convert swards of the short form Spartina alterniflora into plants tending to resemble tall form, biomass/m2 and general morphology. Competition for light is probably responsible vertically elongate, widely dispersed growth habit form. Provision added nutrients led larger δ13C values, by incorporation heavier carbon from internal air spaces S. during high tide, when exchange gases with atmosphere prevented. The amount interstitial water replenished at each tide...
The annual nitrogen budget of a mussel ( Geukensia demissa = Modiolus demissus ) population in salt marsh was determined and compared to the marsh. During each tidal cycle summer, mussels filter volume water excess Yearly, 1.8 times particulate exported from by flushing. Half filtered is absorbed half deposited as feces pseudofeces (biodeposition). Of absorbed, 55% excreted ammonia. As result, releases more ammonia into than does any other Four percent secreted byssal threads, 20% invested...