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Articles 1891 - 1920 of 8071
Full-Text Articles in Entire DC Network
A Dam Passage Performance Standard Model For American Shad, Daniel S. Stich, Timothy F. Sheehan, Joseph D. Zydlewski
A Dam Passage Performance Standard Model For American Shad, Daniel S. Stich, Timothy F. Sheehan, Joseph D. Zydlewski
New Hampshire EPSCoR
Objectives for recovery of alosines commonly involve improving fish passage at dams during migration. However, a quantitative basis for dam passage performance standards is largely absent. We describe development of a stochastic life-history-based simulation model for American shad, Alosa sapidissima, to estimate effects of dam passage and migratory delay on abundance, spatial distribution of spawning adults, and demographic structuring in space and time. We used the Penobscot River, Maine, USA, as a case study to examine sensitivity of modeled population metrics and probability of achieving specific management goals to inputs. Spawner abundance and percentage of repeat spawners were most sensitive …
Responses Of Non-Native Earthworms To Experimental Eradication Of Garlic Mustard And Implications For Native Vegetation, Kristina A. Stinson, Serita D. Frey, M. R. Jackson, E. Coates-Connor, Mark A. Anthony, K. Martinez
Responses Of Non-Native Earthworms To Experimental Eradication Of Garlic Mustard And Implications For Native Vegetation, Kristina A. Stinson, Serita D. Frey, M. R. Jackson, E. Coates-Connor, Mark A. Anthony, K. Martinez
Faculty Publications
Recent studies in invasion biology suggest that positive feedback among two or more introduced organisms facilitate establishment within a new range and drive changes in native plant communities. Here, we experimentally tested for relationships between native plants and two non-native organisms invading forest habitats in North America: garlic mustard (Alliaria petiolata, Brassicaceae) and earthworms. In two forested sites, we compared understory vegetation and earthworm biomass in plots where garlic mustard was removed for three years, plots without garlic mustard invasion, and plots invaded by garlic mustard that was not removed. Earthworm biomass was highest in the plots with garlic mustard, …
Human Activities Accelerated The Degradation Of Saline Seepweed Red Beaches By Amplifying Top‐Down And Bottom‐Up Forces, Weizhi Lu, Jingfeng Xiao, Wei Lei, Jinqiu Du, Zhengjie Li, Pifu Cong, Wenhao Hou, Jialin Zhang, Luzhen Chen, Yihui Zhang, Guoxiang Liao
Human Activities Accelerated The Degradation Of Saline Seepweed Red Beaches By Amplifying Top‐Down And Bottom‐Up Forces, Weizhi Lu, Jingfeng Xiao, Wei Lei, Jinqiu Du, Zhengjie Li, Pifu Cong, Wenhao Hou, Jialin Zhang, Luzhen Chen, Yihui Zhang, Guoxiang Liao
Faculty Publications
Salt marshes dominated by saline seepweed (Suaeda heteroptera) provide important ecosystem services such as sequestering carbon (blue carbon), maintaining healthy fisheries, and protecting shorelines. These salt marshes also constitute stunning red beach landscapes, and the resulting tourism significantly contributes to the local economy. However, land use change and degradation have led to a substantial loss of the red beach area. It remains unclear how human activities influence the top‐down and bottom‐up forces that regulate the distribution and succession of these salt marshes and lead to the degradation of the red beaches. We examined how bottom‐up forces influenced the germination, emergence, …
Sediment Characteristics And Methane Ebullition In Three Subarctic Lakes, Martin Wik, Joel E. Johnson, Patrick M. Crill, Joel P. Destasio, Lance Erickson, Madison J. Halloran, Maria Florencia Fahnestock, Maurice K. Crawford, Stephen C. Phillips, Ruth K. Varner
Sediment Characteristics And Methane Ebullition In Three Subarctic Lakes, Martin Wik, Joel E. Johnson, Patrick M. Crill, Joel P. Destasio, Lance Erickson, Madison J. Halloran, Maria Florencia Fahnestock, Maurice K. Crawford, Stephen C. Phillips, Ruth K. Varner
Faculty Publications
Ebullition (bubbling) from climate‐sensitive northern lakes remains an unconstrained source of atmospheric methane (CH4). Although the focus of many recent studies, ebullition is rarely linked to the physical characteristics of lakes. In this study we analyze the sediments of subarctic postglacial lakes and investigate how sediment properties relate to the large spatial variation in CH4 bubble flux, quantified over multiple years using bubble traps. The results show that the sediments from our lakes are rich in total organic carbon, containing 37 kg/m3 on average. This number is roughly 40% higher than the average for yedoma deposits, which have been identified …
Litter Identity Affects Assimilation Of Carbon And Nitrogen By A Shredding Caddisfly, Adam C. Siders, Zacchaeus G. Compson, Bruce A. Hungate, Paul Dijkstra, George W. Koch, Adam S. Wymore, A. Stuart Grandy, Jane C. Marks
Litter Identity Affects Assimilation Of Carbon And Nitrogen By A Shredding Caddisfly, Adam C. Siders, Zacchaeus G. Compson, Bruce A. Hungate, Paul Dijkstra, George W. Koch, Adam S. Wymore, A. Stuart Grandy, Jane C. Marks
Faculty Publications
Ecologists often equate litter quality with decomposition rate. In soil and sediments, litter that is rapidly decomposed by microbes often has low concentrations of tannin and lignin and low C:N ratios. Do these same traits also favor element transfer to higher trophic levels in streams, where many insects depend on litter as their primary food source? We test the hypothesis that slow decomposition rates promote element transfer from litter to insects, whereas rapid decomposition favors microbes. We measured carbon and nitrogen fluxes from four plant species to a leaf-shredding caddisfly using isotopically labeled litter. Caddisflies assimilated a higher percentage of …
New Grant Will Fund Study Of Hagfish Slime, Sarah Schaier
New Grant Will Fund Study Of Hagfish Slime, Sarah Schaier
UNH Today Archive
No abstract provided.
Meet Your Pals Series: Mamady Sankoh '21, Kassidy Taylor
Meet Your Pals Series: Mamady Sankoh '21, Kassidy Taylor
UNH Today Archive
No abstract provided.
Biotechnology Program Revamps Course, Equipment Aligned With Armi, Unh Communications And Public Affairs
Biotechnology Program Revamps Course, Equipment Aligned With Armi, Unh Communications And Public Affairs
UNH Today Archive
No abstract provided.
Unh Bee Lab Hosts New England Bee Bioblitz In Cheshire County June 22-24, Lori Tyler Gula
Unh Bee Lab Hosts New England Bee Bioblitz In Cheshire County June 22-24, Lori Tyler Gula
Media Relations
No abstract provided.
Unh Researchers Shine A Light On More Accurate Way To Estimate Land-Based Photosynthesis, Rebecca Irelan
Unh Researchers Shine A Light On More Accurate Way To Estimate Land-Based Photosynthesis, Rebecca Irelan
UNH Today Archive
No abstract provided.
Unh Researchers Shine A Light On More Accurate Way To Estimate Climate Change, Robbin Ray
Unh Researchers Shine A Light On More Accurate Way To Estimate Climate Change, Robbin Ray
Media Relations
No abstract provided.
Meet Your Milk At Unh Open Barn June 23, Lori Tyler Gula
Meet Your Milk At Unh Open Barn June 23, Lori Tyler Gula
Media Relations
No abstract provided.
Determining The Effectiveness Of The Clean Air Act And Amendments For The Recovery Of Surface Waters In The Northeastern U.S., Nh Wrrc, University Of New Hampshire
Determining The Effectiveness Of The Clean Air Act And Amendments For The Recovery Of Surface Waters In The Northeastern U.S., Nh Wrrc, University Of New Hampshire
NH Water Resources Research Center Scholarship
No abstract provided.
New Hampshire Wrrc Information Transfer, William H. Mcdowell
New Hampshire Wrrc Information Transfer, William H. Mcdowell
NH Water Resources Research Center Scholarship
No abstract provided.
Salt And Streams: Assessing Ecological Stress In New Hampshire Watersheds At Community, Population, And Molecular Levels, Amy Marie Villamagna
Salt And Streams: Assessing Ecological Stress In New Hampshire Watersheds At Community, Population, And Molecular Levels, Amy Marie Villamagna
NH Water Resources Research Center Scholarship
No abstract provided.
Water Quality And The Landscape: Long-Term Monitoring Of Rapidly Developing Suburban Watersheds, William H. Mcdowell, Michelle Daley Shattuck
Water Quality And The Landscape: Long-Term Monitoring Of Rapidly Developing Suburban Watersheds, William H. Mcdowell, Michelle Daley Shattuck
NH Water Resources Research Center Scholarship
No abstract provided.
Ecosystem Indicators For Freshwater Streams, Alison Watts
Ecosystem Indicators For Freshwater Streams, Alison Watts
NH Water Resources Research Center Scholarship
No abstract provided.
Temporal Dynamics Of Halogenated Organic Compounds In Marcellus Shale Flowback, Jenna L. Luek, Mourad Harir, Philippe Schmitt-Kopplin, Paula J. Mouser, Michael Gonsior
Temporal Dynamics Of Halogenated Organic Compounds In Marcellus Shale Flowback, Jenna L. Luek, Mourad Harir, Philippe Schmitt-Kopplin, Paula J. Mouser, Michael Gonsior
Civil & Environmental Engineering
The chemistry of hydraulic fracturing fluids and wastewaters is complex and is known to vary by operator, geologic formation, and fluid age. A time series of hydraulic fracturing fluids, flowback fluids, and produced waters was collected from two adjacent Marcellus Shale gas wells for organic chemical composition analyses using ultrahigh resolution mass spectrometry. Hierarchical clustering was used to compare and extract ions related to different fluid ages and many halogenated organic molecular ions were identified in flowback fluids and early produced waters based on exact mass. Iodinated organic compounds were the dominant halogen class in these clusters and were nearly …
Hot And Salty: Assessing Ecological Stress In New Hampshire Streams At Community, Population, And Molecular Levels, Amy Marie Villamagna
Hot And Salty: Assessing Ecological Stress In New Hampshire Streams At Community, Population, And Molecular Levels, Amy Marie Villamagna
NH Water Resources Research Center Scholarship
No abstract provided.
In The News: Daniel Seichepine Talks Heroin's Effects On Brain On Wmur, Unh Communications And Public Affairs
In The News: Daniel Seichepine Talks Heroin's Effects On Brain On Wmur, Unh Communications And Public Affairs
UNH Today Archive
No abstract provided.
In The News: Daniel Seichepine Talks Heroin's Effects On Brain On Wmur, Unh Communications And Public Affairs
In The News: Daniel Seichepine Talks Heroin's Effects On Brain On Wmur, Unh Communications And Public Affairs
UNH Today Archive
No abstract provided.
Passing: Professor Emeritus William Condon, Unh Communications And Public Affairs
Passing: Professor Emeritus William Condon, Unh Communications And Public Affairs
UNH Today Archive
No abstract provided.
Research Into The Future, Jennifer Saunders
Ready For What's Next, Unh Communications And Public Affairs
Ready For What's Next, Unh Communications And Public Affairs
UNH Today Archive
No abstract provided.
Unh Researchers Find Invasive Seaweed Makes Fish Change Their Behavior, Robbin Ray
Unh Researchers Find Invasive Seaweed Makes Fish Change Their Behavior, Robbin Ray
Media Relations
No abstract provided.
Nowhere To Hide, Beth Potier
“Your Education Is A Tool, Not A Weapon.”, Kassidy Taylor
“Your Education Is A Tool, Not A Weapon.”, Kassidy Taylor
UNH Today Archive
No abstract provided.
One Summer, Seven Scholarships, Jennifer Saunders
One Summer, Seven Scholarships, Jennifer Saunders
UNH Today Archive
No abstract provided.
Unh Manchester To Celebrate 274 Graduates At May 17th Commencement Ceremony, Kassidy Taylor
Unh Manchester To Celebrate 274 Graduates At May 17th Commencement Ceremony, Kassidy Taylor
UNH Today Archive
No abstract provided.
From Sharks To Cyanotoxins, Jody Record