Hilary Neckles, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 39
Using hydrogeomorphic criteria to classify wetlands on Mt. Desert Island, Maine – Approach, classification system, and examples
A wetland classification system was designed for Mt. Desert Island, Maine, to help categorize the large number of wetlands (over 1,200 mapped units) as an aid to understanding their hydrologic functions. The classification system, developed by the U.S. Geological Survey (USGS), in cooperation with the National Park Service, uses a modified hydrogeomorphic (HGM) approach, and assigns categories bas
Authors
Martha G. Nielsen, Glenn R. Guntenspergen, Hilary A. Neckles
Negative effects of commercial mussel dragging on eelgrass beds in Maine
A study by the US Geological Survey, the University of New Hampshire, and the Maine Department of Marine Resources showed that commercial mussel dragging poses a severe and long-lasting threat to eelgrass (Zostera marina). Dragging can damage large areas, with individual drag scars up to 79 acres in size found in Maine eelgrass beds. Dragging activity uproots eelgrass plants completely, removing l
Authors
Hilary A. Neckles, Frederick T. Short, Seth Barker, Blaine S. Kopp
Disturbance of eelgrass Zostera marina by commercial mussel Mytilus edulis harvesting in Maine: Dragging impacts and habitat recovery
We studied the effects of commercial harvest of blue mussels Mytilus edulis on eelgrass Zostera marina L. in Maquoit Bay, Maine, USA, at a hierarchy of scales. We used aerial photography, underwater video, and eelgrass population- and shoot-based measurements to quantify dragging impacts within 4 sites that had been disturbed at different times over an approximate 7 yr interval, and to project eel
Authors
Hilary A. Neckles, Frederick T. Short, Seth Barker, Blaine S. Kopp
Disturbance of eelgrass Zostera marina by commercial mussel Mytilus edulis harvesting in Maine: Dragging impacts and habitat recovery
We studied the effects of commercial harvest of blue mussels Mytilus edulis on eelgrass Zostera marina L. in Maquoit Bay, Maine, USA, at a hierarchy of scales. We used aerial photography, underwater video, and eelgrass population- and shoot-based measurements to quantify dragging impacts within 4 sites that had been disturbed at different times over an approximate 7 yr interval, and to project eel
Authors
Hilary A. Neckles, Frederick T. Short, Seth Barker, Blaine S. Kopp
The effect of nitrogen loading on a brackish estuarine faunal community: A stable isotope approach
Coastal ecosystems worldwide face increased nutrient enrichment from shoreline and watershed development and atmospheric pollution. We investigated the response of the faunal community of a small microtidal estuary dominated by Ruppia maritima (widgeon grass) in Maine, United States, to increased nitrogen loading using an in situ mesocosm enrichment experiment. Community response was characterize
Authors
R.A. Keats, L.J. Osher, H.A. Neckles
Coastal ecosystems and resources framework for science
No abstract available.
Authors
John F. Bratton, Glenn Guntenspergen, B.E. Taggart, Douglas Wheeler, Lynn Bjorklund, Michael H. Bothner, Rama Kotra, Robert Lent, E.L. Mecray, Hilary Neckles, Barbara Poore, Stephen Rideout, Susan Russell-Robinson, P.K. Weiskel
A monitoring protocol to assess tidal restoration of salt marshes on local and regional scales
Assessing the response of salt marshes to tidal restoration relies on comparisons of ecosystem attributes between restored and reference marshes. Although this approach provides an objective basis for judging project success, inferences can be constrained if the high variability of natural marshes masks differences in sampled attributes between restored and reference sites. Furthermore, such ass
Authors
H.A. Neckles, M.D. Dionne, D.M. Burdick, C. T. Roman, R. Buchsbaum, E. Hutchins
Determining the trophic guilds of fishes and macroinvertebrates in a seagrass food web
We established trophic guilds of macroinvertebrate and fish taxa using correspondence analysis and a hierarchical clustering strategy for a seagrass food web in winter in the northeastern Gulf of Mexico. To create the diet matrix, we characterized the trophic linkages of macroinvertebrate and fish taxa. present in Hatodule wrightii seagrass habitat areas within the St. Marks National Wildlife Refu
Authors
J.J. Luczkovich, G.P. Ward, J.C. Johnson, R.R. Christian, D. Baird, H. Neckles, W.M. Rizzo
The effects of global climate change on seagrasses
The increasing rate of global climate change seen in this century, and predicted to accelerate into the next, will significantly impact the Earth's oceans. In this review, we examine previously published seagrass research through a lens of global climate change in order to consider the potential effects on the world's seagrasses. A primary effect of increased global temperature on seagrasses will
Authors
Frederick T. Short, Hilary A. Neckles
Impacts of elevated inorganic carbon concentrations of the autotrophic components of coastal submersed macrophyte communities
No abstract available.
Authors
William M. Rizzo, Hilary A. Neckles, Ronald G. Boustany, David R. Meaux, Martha R. Griffis
Hydrologic control of litter decomposition in seasonally flooded prairie marshes
The effect of seasonal inundation on the decomposition of emergent macrophyte litter (Scolochloa festucacea) was examined under experimental flooding regimes in a northern prairie marsh. Stem and leaf litter was subjected to six aboveground inundation treatments (ranging from never flooded to flooded April through October) and two belowground treatments (nonflooded and flooded April to August). Fl
Authors
Hilary A. Neckles, Christopher Neill
Global climate change: Implications for submerged aquatic vegetation
No abstract available.
Authors
William M. Rizzo, Hilary A. Neckles
Non-USGS Publications**
Moore, K. A., H. A. Neckles, and R. J. Orth.1996. Zostera marina (eelgrass) growth and survival along a gradient of nutrients and turbidity in the lower Chesapeake Bay. Marine Ecology Progress Series 142:247-259. DOI: 10.3354/meps142247
Neckles, H. A. (ed). 1994. Indicator development: seagrass monitoring and research in the Gulf of Mexico. EPA/620/R-94/029. 64pp.
Neckles, H. A., E. T. Koepfler, L. W. Haas, R. L. Wetzel, and R. J. Orth. 1994. Dynamics of epiphytic photoautotrophs and heterotrophs in Zostera marina L. (eelgrass) microcosms: responses to nutrient enrichment and grazing. Estuaries 17:597-605. DOI: 10.2307/1352407
Neckles, H. A., H. R. Murkin, and J. A. Cooper. 1990. Influences of seasonal flooding on macroinvertebrate abundance in wetland habitats. Freshwater Biology 23:311-322. DOI: 10.1111/j.1365-2427.1990.tb00274.x
Neckles, H. A. and R. L. Wetzel. 1989. Effects of forage harvest in seasonally flooded prairie marshes: simulation model experiments. pp. 975-990 in R. R. Sharitz and J. W. Gibbons (eds). Freshwater Wetlands and Wildlife. DOE Symposium Series No. 61, USDOE Office of Scientific and Technical Information, Oak Ridge, TN.
Wetzel, R. L. and H. A. Neckles. 1986. A model of Zostera marina L. photosynthesis and growth: simulated effects of selected physical-chemical variables and biological interactions. Aquatic Botany 26:307-323. DOI: 10.1007/BF00317683
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
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Filter Total Items: 39
Using hydrogeomorphic criteria to classify wetlands on Mt. Desert Island, Maine – Approach, classification system, and examples
A wetland classification system was designed for Mt. Desert Island, Maine, to help categorize the large number of wetlands (over 1,200 mapped units) as an aid to understanding their hydrologic functions. The classification system, developed by the U.S. Geological Survey (USGS), in cooperation with the National Park Service, uses a modified hydrogeomorphic (HGM) approach, and assigns categories basAuthorsMartha G. Nielsen, Glenn R. Guntenspergen, Hilary A. NecklesNegative effects of commercial mussel dragging on eelgrass beds in Maine
A study by the US Geological Survey, the University of New Hampshire, and the Maine Department of Marine Resources showed that commercial mussel dragging poses a severe and long-lasting threat to eelgrass (Zostera marina). Dragging can damage large areas, with individual drag scars up to 79 acres in size found in Maine eelgrass beds. Dragging activity uproots eelgrass plants completely, removing lAuthorsHilary A. Neckles, Frederick T. Short, Seth Barker, Blaine S. KoppDisturbance of eelgrass Zostera marina by commercial mussel Mytilus edulis harvesting in Maine: Dragging impacts and habitat recovery
We studied the effects of commercial harvest of blue mussels Mytilus edulis on eelgrass Zostera marina L. in Maquoit Bay, Maine, USA, at a hierarchy of scales. We used aerial photography, underwater video, and eelgrass population- and shoot-based measurements to quantify dragging impacts within 4 sites that had been disturbed at different times over an approximate 7 yr interval, and to project eelAuthorsHilary A. Neckles, Frederick T. Short, Seth Barker, Blaine S. KoppDisturbance of eelgrass Zostera marina by commercial mussel Mytilus edulis harvesting in Maine: Dragging impacts and habitat recovery
We studied the effects of commercial harvest of blue mussels Mytilus edulis on eelgrass Zostera marina L. in Maquoit Bay, Maine, USA, at a hierarchy of scales. We used aerial photography, underwater video, and eelgrass population- and shoot-based measurements to quantify dragging impacts within 4 sites that had been disturbed at different times over an approximate 7 yr interval, and to project eelAuthorsHilary A. Neckles, Frederick T. Short, Seth Barker, Blaine S. KoppThe effect of nitrogen loading on a brackish estuarine faunal community: A stable isotope approach
Coastal ecosystems worldwide face increased nutrient enrichment from shoreline and watershed development and atmospheric pollution. We investigated the response of the faunal community of a small microtidal estuary dominated by Ruppia maritima (widgeon grass) in Maine, United States, to increased nitrogen loading using an in situ mesocosm enrichment experiment. Community response was characterizeAuthorsR.A. Keats, L.J. Osher, H.A. NecklesCoastal ecosystems and resources framework for science
No abstract available.AuthorsJohn F. Bratton, Glenn Guntenspergen, B.E. Taggart, Douglas Wheeler, Lynn Bjorklund, Michael H. Bothner, Rama Kotra, Robert Lent, E.L. Mecray, Hilary Neckles, Barbara Poore, Stephen Rideout, Susan Russell-Robinson, P.K. WeiskelA monitoring protocol to assess tidal restoration of salt marshes on local and regional scales
Assessing the response of salt marshes to tidal restoration relies on comparisons of ecosystem attributes between restored and reference marshes. Although this approach provides an objective basis for judging project success, inferences can be constrained if the high variability of natural marshes masks differences in sampled attributes between restored and reference sites. Furthermore, such assAuthorsH.A. Neckles, M.D. Dionne, D.M. Burdick, C. T. Roman, R. Buchsbaum, E. HutchinsDetermining the trophic guilds of fishes and macroinvertebrates in a seagrass food web
We established trophic guilds of macroinvertebrate and fish taxa using correspondence analysis and a hierarchical clustering strategy for a seagrass food web in winter in the northeastern Gulf of Mexico. To create the diet matrix, we characterized the trophic linkages of macroinvertebrate and fish taxa. present in Hatodule wrightii seagrass habitat areas within the St. Marks National Wildlife RefuAuthorsJ.J. Luczkovich, G.P. Ward, J.C. Johnson, R.R. Christian, D. Baird, H. Neckles, W.M. RizzoThe effects of global climate change on seagrasses
The increasing rate of global climate change seen in this century, and predicted to accelerate into the next, will significantly impact the Earth's oceans. In this review, we examine previously published seagrass research through a lens of global climate change in order to consider the potential effects on the world's seagrasses. A primary effect of increased global temperature on seagrasses willAuthorsFrederick T. Short, Hilary A. NecklesImpacts of elevated inorganic carbon concentrations of the autotrophic components of coastal submersed macrophyte communities
No abstract available.AuthorsWilliam M. Rizzo, Hilary A. Neckles, Ronald G. Boustany, David R. Meaux, Martha R. GriffisHydrologic control of litter decomposition in seasonally flooded prairie marshes
The effect of seasonal inundation on the decomposition of emergent macrophyte litter (Scolochloa festucacea) was examined under experimental flooding regimes in a northern prairie marsh. Stem and leaf litter was subjected to six aboveground inundation treatments (ranging from never flooded to flooded April through October) and two belowground treatments (nonflooded and flooded April to August). FlAuthorsHilary A. Neckles, Christopher NeillGlobal climate change: Implications for submerged aquatic vegetation
No abstract available.AuthorsWilliam M. Rizzo, Hilary A. NecklesNon-USGS Publications**
Moore, K. A., H. A. Neckles, and R. J. Orth.1996. Zostera marina (eelgrass) growth and survival along a gradient of nutrients and turbidity in the lower Chesapeake Bay. Marine Ecology Progress Series 142:247-259. DOI: 10.3354/meps142247Neckles, H. A. (ed). 1994. Indicator development: seagrass monitoring and research in the Gulf of Mexico. EPA/620/R-94/029. 64pp.Neckles, H. A., E. T. Koepfler, L. W. Haas, R. L. Wetzel, and R. J. Orth. 1994. Dynamics of epiphytic photoautotrophs and heterotrophs in Zostera marina L. (eelgrass) microcosms: responses to nutrient enrichment and grazing. Estuaries 17:597-605. DOI: 10.2307/1352407Neckles, H. A., H. R. Murkin, and J. A. Cooper. 1990. Influences of seasonal flooding on macroinvertebrate abundance in wetland habitats. Freshwater Biology 23:311-322. DOI: 10.1111/j.1365-2427.1990.tb00274.xNeckles, H. A. and R. L. Wetzel. 1989. Effects of forage harvest in seasonally flooded prairie marshes: simulation model experiments. pp. 975-990 in R. R. Sharitz and J. W. Gibbons (eds). Freshwater Wetlands and Wildlife. DOE Symposium Series No. 61, USDOE Office of Scientific and Technical Information, Oak Ridge, TN.Wetzel, R. L. and H. A. Neckles. 1986. A model of Zostera marina L. photosynthesis and growth: simulated effects of selected physical-chemical variables and biological interactions. Aquatic Botany 26:307-323. DOI: 10.1007/BF00317683**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
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