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Articles 3241 - 3270 of 6907

Full-Text Articles in Physical Sciences and Mathematics

Maine Yankee Nuclear Power Plant: A Technological Utopia In Retrospect, Howard P. Segal Apr 2009

Maine Yankee Nuclear Power Plant: A Technological Utopia In Retrospect, Howard P. Segal

Maine History

The Maine Yankee nuclear power plant, built in 1968 and closed in 1996, provides a revealing case study of the rise and fall of the nuclear power industry in the United States. At its inception, the plant generated a great outpouring of optimistic superlatives promising electricity “too cheap to meter” and a solution to Maine’s longstanding energy problems. Its promoters envisioned a technological utopia for Maine communities based on cheap and efficient energy, and based on these promising prospects, the town of Wiscasset welcomed the plant. This article traces the changes in public thinking that led to statewide referenda on …


A Device To Record The Specific Time An Artificial Nest Is Depredated, Jennifer S. Borgo, Michael R. Conover Apr 2009

A Device To Record The Specific Time An Artificial Nest Is Depredated, Jennifer S. Borgo, Michael R. Conover

Human–Wildlife Interactions

We designed a timing device that records the calendar date and time of a depredation event on an artificial nest. The clock was simple to construct and successful in field trials, with only 6% failure (3 of 48 clocks). The average difference between actual and estimated depredation time was 4.6 minutes. Use of this clock improves daily survival estimates, provides insight into predator activity patterns, and allows the evaluation of investigator-induced depredation.


Human–Wildlife Conflicts: Emerging Challenges And Opportunities, Terry A. Messmer Apr 2009

Human–Wildlife Conflicts: Emerging Challenges And Opportunities, Terry A. Messmer

Human–Wildlife Interactions

Wildlife management has been defined as the art and science of applying scientific knowledge and ecological principles to manage wildlife populations for human objectives. Historically, wildlife managers have sought to maintain or increase desirable wildlife species (e.g., game fish, birds, and mammals) to meet human food and recreational needs by directly manipulating their habitats or the populations themselves. However, many contemporary rural and urban environments are inhabited by much larger populations of wildlife than were present a century ago. As local wildlife populations increase, so can the damage caused by them. Additionally, because many rare species inhabit private lands, the …


Estimating Deer Abundance In Suburban Areas With Infrared-Triggered Cameras, Paul D. Curtis, Bazartseren Boldgiv, Peter M. Mattison, Jason R. Boulanger Apr 2009

Estimating Deer Abundance In Suburban Areas With Infrared-Triggered Cameras, Paul D. Curtis, Bazartseren Boldgiv, Peter M. Mattison, Jason R. Boulanger

Human–Wildlife Interactions

Interactions between humans and white-tailed deer (Odocoileus virginianus) have become common, often resulting in management actions to mitigate negative impacts. Changes in population size are generally used to judge management actions. We examined deer population estimation techniques during 2 mark-resighting experiments in a woodland-grassland habitat in central New York State and in a suburban area. We compared program NOREMARK, Lincoln-Peterson estimates, and Jacobson’s (1997) buck:doe ratios (BDR) for estimating deer abundance. In the first field trial, we sought to validate the camera survey methods and computer applications. We used infrared-triggered cameras (IRCs) to survey a white-tailed deer population …


Translocation Of Nine-Banded Armadillos, Daniel J. Gammons, Michael T. Mengak, L. Mike Conner Apr 2009

Translocation Of Nine-Banded Armadillos, Daniel J. Gammons, Michael T. Mengak, L. Mike Conner

Human–Wildlife Interactions

During the last 150 years, nine-banded armadillos (Dasypus novemcinctus) have increased their range and abundance in the southeastern United States. When foraging, armadillos cause damage to agricultural crops, as well as structural damage to driveways and foundations. Homeowners frequently use translocation to reduce local armadillo abundance. Despite its popularity with the general public, however, the appropriateness of nuisance wildlife translocation presents concerns for biologists. Our objective was to address some of these concerns by examining survival and movements of translocated armadillos. We translocated 12 armadillos (9 male, 3 female) equipped with radio-transmitters and compared their survival and movements …


External Characteristics Of Houses Prone To Woodpecker Damage, Emily G. Harding, Sandra L. Vehrencamp, Paul D. Curtis Apr 2009

External Characteristics Of Houses Prone To Woodpecker Damage, Emily G. Harding, Sandra L. Vehrencamp, Paul D. Curtis

Human–Wildlife Interactions

Woodpecker (Picidae spp.) damage to houses and buildings is a widespread and locally severe problem, yet the probability and type of damage has never been quantified and related to home characteristics. Woodpeckers excavate holes in homes for a several reasons, mainly for building nest and roost cavities, drumming, and foraging for insects. We examined the external characteristics of houses that were contributing factors in attracting woodpeckers to bore holes in house siding and trim. From March 2001 through April 2002, we surveyed 1,185 houses in the town of Ithaca, Tompkins County, New York. Of the houses visited, 33% had …


Factors Contributing To The Success Of A Single-Shot, Multiyear Pzp Immunocontraceptive Vaccine For White-Tailed Deer, Lowell A. Miller, Kathleen A. Fagerstone, Donald C. Wagner, Gary J. Killian Apr 2009

Factors Contributing To The Success Of A Single-Shot, Multiyear Pzp Immunocontraceptive Vaccine For White-Tailed Deer, Lowell A. Miller, Kathleen A. Fagerstone, Donald C. Wagner, Gary J. Killian

Human–Wildlife Interactions

We evaluated 6 different porcine zona pellucida (PZP) preparations used as a single-shot vaccine for multiyear contraception of captive white-tailed deer (Odocoileus virginianus). The study compared 2 PZP preparation technologies from ImmunoVaccine Technologies ™ (IVT) and National Wildlife Research Center (NWRC) over a 7-year period. The study compared both the use of oil in an emulsion and in suspension delivery, as well as replacement of the oil with an alum adjuvant. The study demonstrated that the oil emulsion adjuvant provided the longest lasting response. PZP isolated by the IVT provides a longer-lasting response than the preparation used by …


A Review Of The Potential Of Fertility Control To Manage Brushtail Possums In New Zealand, Weihong Ji Apr 2009

A Review Of The Potential Of Fertility Control To Manage Brushtail Possums In New Zealand, Weihong Ji

Human–Wildlife Interactions

Brushtail possums (Trichosurus vulpecula) were introduced into New Zealand from Australia in the mid-1800s and became a major invasive pest. They damage native biodiversity by browsing and predation, and they are a disease risk to the livestock industry by acting as vectors of bovine tuberculosis (TB). Management of possums includes their eradication from some offshore islands and control by trapping, shooting, and poisoning on the mainland. Possums have been eradicated successfully from some islands and greatly reduced in abundance in other areas of high conservation value or where they are infected with TB. However, possums are still at …


Scwds Briefs: Volume 25, Number 1 (April 2009), Gary L. Doster , Editor, Scwds Briefs, Michael J. Yabsley Apr 2009

Scwds Briefs: Volume 25, Number 1 (April 2009), Gary L. Doster , Editor, Scwds Briefs, Michael J. Yabsley

Southeastern Cooperative Wildlife Disease Study: Publications

Table of Contents:

USDA Seeks Comments on New CWD Rule

Some of the Intricacies of CWD

3rd International CWD Symposium

White Nose Syndrome Update

Wildlife Poisoning in Kansas

Salmonellosis in Your Backyard

Trichomonosis in Songbirds

Dr. Al Franzmann

Staff & Student Recognition


Changes In Producer Attitudes Towards Windbreaks In Eastern Nebraska, 1983 To 2009, Kim Tomczak Apr 2009

Changes In Producer Attitudes Towards Windbreaks In Eastern Nebraska, 1983 To 2009, Kim Tomczak

Department of Environmental Studies: Undergraduate Student Theses

Abstract Windbreaks are rows of trees or shrubs arranged on the landscape to reduce wind speed. In agricultural landscapes we find them as farmstead windbreaks, livestock windbreaks and field windbreaks. While farmstead and livestock windbreaks are well accepted by the agricultural community, field windbreaks are often viewed differently. A 1982 study of the attitudes of farmers in Eastern Nebraska indicated that many of the producers were around the age of 50 and that they used different types of windbreaks. This study repeated that survey in the same. When compared to data from 1982, farmers today are not educated about the …


Water Quality Variability In A Bioswell And Concrete Drainage Pipe, Southwest Lincoln, Nebraska, Jessica Shortino Apr 2009

Water Quality Variability In A Bioswell And Concrete Drainage Pipe, Southwest Lincoln, Nebraska, Jessica Shortino

Department of Environmental Studies: Undergraduate Student Theses

Abstract The goal of this project is to evaluate the effectiveness of bioswells in protecting water quality from urban runoff. The hypothesis tested in this project is that water in bioswells improves water quality. Water quality in both a bioswell and an underground concrete lined ditch, both containing ground and surface water, were tested for certain water quality parameters. These parameters consisted of: Dissolved Oxygen, pH, water temperature, weather temperature, Total Dissolved Solids, Specific Conductivity, Alkalinity, Total Dissolved Carbon, Chemical Oxygen Demand, and depth and width of the sampling site. An additional contaminant that was looked at was motor oil. …


Historical Review Of Elk–Agriculture Conflicts In And Around Riding Mountain National Park, Manitoba, Canada, Ryan K. Brook Apr 2009

Historical Review Of Elk–Agriculture Conflicts In And Around Riding Mountain National Park, Manitoba, Canada, Ryan K. Brook

Human–Wildlife Interactions

Conflicts between elk (Cervus elaphus) and farmers have been occurring since the 1880s when agriculture began around what is now Riding Mountain National Park (RMNP). Initially, the conflicts were related to low elk numbers caused primarily by unregulated harvest of elk. The creation of RMNP in 1930 and the associated ban on hunting allowed elk numbers to reach critically high levels. Since farming began, elk have been associated with considerable damage to fences and crops around RMNP, with annual damage often >$240,000. Hunting on agricultural lands has been the most common approach to mitigating elk impacts, despite its limited success. …


Strengthening Relationships Between State University Extension Systems And Nuisance Wildlife Control Operators, Lynn Braband Apr 2009

Strengthening Relationships Between State University Extension Systems And Nuisance Wildlife Control Operators, Lynn Braband

Human–Wildlife Interactions

The land-grant university extension system is an American success story. The general mission of extension is to be a research-based information broker between the university and public stakeholders. Examples of successful long-term partnerships between extension and industry include agriculture, structural pest control, and the green industry (turfgrass and landscape management). There is, however, the potential for the development of another partnership with the relatively new industry of private sector nuisance wildlife control.

To help inform my thinking on the current status and potential of such relationships, I queried 12 wildlife extension specialists (most with extension positions at land-grant universities), 17 …


Deterring Cliff-Swallow Nesting On Highway Structures Using Bioacoustics And Surface Modifications, Jaclyn S. Conklin, Michael J. Delwiche, W. Paul Gorenzel, Robert W. Coates Apr 2009

Deterring Cliff-Swallow Nesting On Highway Structures Using Bioacoustics And Surface Modifications, Jaclyn S. Conklin, Michael J. Delwiche, W. Paul Gorenzel, Robert W. Coates

Human–Wildlife Interactions

Cliff swallows (Petrochelidon pyrrhonota) are migratory birds that breed in colonies and frequently nest on highway structures. Protected by the Migratory Bird Treaty Act of 1918, swallows in their active nests cannot be harmed by nesting-control methods. This causes problems and delays in maintenance of structures by divisions of many departments of transportation. We evaluated 2 aversion strategies, bioacoustic deterrents and surface modifi cations, for their effect on cliff swallow nesting behavior. The bioacoustic deterrents consisted of sonic devices that broadcast 8 unique recordings of alarm and distress calls of cliff swallows. We made surface modifications, mounting high-density …


House Cats As Predators In The Australian Environment: Impacts And Management, Christopher R. Dickman Apr 2009

House Cats As Predators In The Australian Environment: Impacts And Management, Christopher R. Dickman

Human–Wildlife Interactions

This paper provides an overview of the predatory activities of the house cat (Felis catus) in Australia, focusing principally on the interactions of domestic and stray cats with native species of prey. Like their free-living, or feral, counterparts, domestic cats take a broad range of prey, with small mammals, birds, and human-derived foods forming the bulk of the diet. Domestic and stray cats have contributed to declines of suburban populations of eastern barred bandicoots (Perameles gunnii) and superb lyrebirds (Menura novaehollandiae) in Victoria, Australia. The effects of cats on prey communities remain speculative. In …


Exotic Species And Monkey Paws, Michael R. Conover Apr 2009

Exotic Species And Monkey Paws, Michael R. Conover

Human–Wildlife Interactions

Society is divided over the question of how exotic species should be managed. As an example, consider the attitude of U.S. citizens toward 1 exotic species, mute swans (Cygnus lotor), which were imported from Europe. These birds have much going for them. Their bright, white plumage, their eagerness to swim our way for bread, and their prominence in legends has allowed them to conquer our hearts (Conover and McIvor 1993). Yet, many ecologists, wildlife biologists, and avid birders argue that we should spend time and money to eradicate mute swans from the U.S. because they are an exotic …


Home Range And Habitat Use Of Feral Hogs In Congaree National Park, South Carolina, Brad A. Friebel, Patrick G. R. Jodice Apr 2009

Home Range And Habitat Use Of Feral Hogs In Congaree National Park, South Carolina, Brad A. Friebel, Patrick G. R. Jodice

Human–Wildlife Interactions

Feral hogs (Sus scrofa) are a widespread exotic species that currently occur in most states within the United States and are common throughout the southeastern United States. We radio-collared and tracked feral hogs from April 2005 to November 2006 in Congaree National Park (CNP), South Carolina, USA. The CNP is one of the largest and most intact tracts of old-growth, bottomland hardwood forest remaining in the United States. We measured home range size and determined habitat use for male and female hogs. The mean (± SE) home range sizes for male hogs (n = 7) and female hogs …


In The News, Joe N. Caudell Apr 2009

In The News, Joe N. Caudell

Human–Wildlife Interactions

Deer hunters may shoot feral hogs (New Jersey)
Exotic species threaten Texas horned lizard
Several servals on the loose (PA, GA, WA, MI, MO, IL)
Brown tree snake causes printer paper jam
Guam ravaged by variety of invasive species: brown tree snake, rhinoceros beetle, salamander (Eurycea sp.) and a garter snake (Thamnophis sp.)
Humans stand up for themselves during bear attacks: Eagle River, Alaska, Cooper Landing, Alaska, & Logan, Utah.
The invasive monk parakeet is causing problems in Edgewater, NJ.
Starlings in Indianapolis & the Vatican


White-Tailed Deer Attacking Humans During The Fawning Season: A Unique Human–Wildlife Conflict On A University Campus, Ryan D. Hubbard, Clayton K. Nielsen Apr 2009

White-Tailed Deer Attacking Humans During The Fawning Season: A Unique Human–Wildlife Conflict On A University Campus, Ryan D. Hubbard, Clayton K. Nielsen

Human–Wildlife Interactions

Human–wildlife conflicts associated with suburban white-tailed deer (Odocoileus virginianus) populations have increased in the last 20 years. Primary threats to human health and safety associated with overabundant deer populations include deer–vehicle collisions, attacks on humans, disease, and damage to native and ornamental vegetation. During the fawning seasons (May–June) of 2005 and 2006, 13 confirmed incidences of white-tailed deer attacking humans occurred on the campus of Southern Illinois University–Carbondale. To our knowledge, no report exists that documents free-ranging does attacking humans during the fawning season. The attacks occurred at multiple locations on campus, with injuries to humans, including minor …


Development Of Wildlife Damage Management: A Personal Perspective, Walter E. Howard Apr 2009

Development Of Wildlife Damage Management: A Personal Perspective, Walter E. Howard

Human–Wildlife Interactions

During my professional career, many changes have occurred in the management of wildlife damage and human–wildlife conflicts, including some dramatic changes in people’s attitudes. ... Vertebrate pest control has now become a sophisticated scientific field. It is recognized that the factors responsible for some species of birds and mammals becoming pests are many. A species can overpopulate due to changes in habitat, lessening of predation, lack of competition with other species, or by transmitting disease. Additionally, the National Academy of Sciences’ National Research Council Agricultural Board recognized that wildlife and other competitors of agriculture are important to the economy of …


Deer Guards And Bump Gates For Excluding White-Tailed Deer From Fenced Resources, Kurt C. Vercauteren, Nathan W. Seward, Michael J. Lavelle, Justin W. Fischer, Gregaory E. Phillips Apr 2009

Deer Guards And Bump Gates For Excluding White-Tailed Deer From Fenced Resources, Kurt C. Vercauteren, Nathan W. Seward, Michael J. Lavelle, Justin W. Fischer, Gregaory E. Phillips

Human–Wildlife Interactions

White-tailed deer (Odocoileus virginianus) causing damage is a reoccurring theme in the realm of wildlife damage management, especially regarding human safety, disease transmission, and agricultural losses. Fences often are the only reliable long-term nonlethal means of controlling deer damage. The efficacy of fences, however, relies on their weakest link: human-operated gates. Although not overly time-consuming, the act of closing a gate appears to be a burden to individuals, resulting in open-access to an otherwise protected resource. We examined the efficacy of 2 alternatives to traditional gates to evaluate their potential to be used for excluding or containing deer. …


A Survery Of Western United States Instream Flow Programs And The Policies That Protect A River's Ecosystem, Kyle Jackson Apr 2009

A Survery Of Western United States Instream Flow Programs And The Policies That Protect A River's Ecosystem, Kyle Jackson

Department of Environmental Studies: Undergraduate Student Theses

The Western United States can best be described as a vast, varying land, with the high plains to the east and the jagged horizons of Rockies to the west. However there is one common trait shared by these states: the lack of water resources. With the continued development of this land, the fact that water is scarce is becoming more real. This issue became more difficult to handle as the public became more aware that many competing uses existed for the finite resource, and those different uses were degrading the natural environments of the surface waters. With this realization instream …


Low-Level Pharmaceuticals And Personal Care Products In The Waters Of Michigan, Lisa M. Anderson Apr 2009

Low-Level Pharmaceuticals And Personal Care Products In The Waters Of Michigan, Lisa M. Anderson

Dissertations

The results of this research are the product of a two year study funded by the Michigan Department of Environmental Quality with monies from the Clean Michigan Initiative. Low-level (part per billion range) pharmaceuticals and personal care products (PPCPs) in the waters of Michigan were investigated. Five rivers in the State were sampled; including the Clinton, Grand, Kalamazoo, Muskegon, and Saginaw. Groundwater samples were obtained from two shallow municipal water wells also; one on the Grand River and one on the Kalamazoo River. The wells were sampled to determine if PPCPs in the river water were being drawn in by …


Limnological Assistance For The Lake Mead National Recreation Area In Meeting The Challenge Of The Water 2025 Initiative: Quarterly Report, Period Ending April 1, 2009, Margaret N. Rees Apr 2009

Limnological Assistance For The Lake Mead National Recreation Area In Meeting The Challenge Of The Water 2025 Initiative: Quarterly Report, Period Ending April 1, 2009, Margaret N. Rees

Limnological Studies

Project 1: Technical input has been provided at two advisory team meetings attended this quarter.

Project 2: Surface Water Monitoring for Indicator Bacteria in High-use Sites of the Lake Mead National Recreation Area (poster) was presented at the Lake Mead Science Symposium; a journal article is in preparation.

Project 3: A draft document titled “Interagency Monitoring Action Plan (I-MAP): Quagga Mussels in Lakes Mead and Mohave” has been subdivided into four major sections and corresponding sub-groups have been formed to provide review and input. Six oral presentations related to quagga mussels were presented at the Lake Mead Science Symposium. Two …


Implications Of The Monck Head Boat Launching Facility On Adjacent Intertidal Sessile Assemblages (Coral Bay, Western Australia), Megan Sabal Apr 2009

Implications Of The Monck Head Boat Launching Facility On Adjacent Intertidal Sessile Assemblages (Coral Bay, Western Australia), Megan Sabal

Independent Study Project (ISP) Collection

The aim of this study was to observe if the construction of the Monck Head boat launching facility in September 2007 has impacted the adjacent intertidal sessile assemblages. Through a series of linear transects and quadrats, data was gathered to look at diversity and species composition on both north and south sides of the boat launching facility. Measurements of sand accumulation and map interpretation of fetch also provided insight to local physical processes of water flow, sedimentation and wave energy. The results showed that there was a significant accumulation of sand on the south side of the boat launching facility …


Nevada Interagency Volunteer Program: Helping Hands Across Public Lands – Phase Ii: Quarterly Progress Report, Period Covering January 1, 2009 – March 31, 2009, Margaret N. Rees Mar 2009

Nevada Interagency Volunteer Program: Helping Hands Across Public Lands – Phase Ii: Quarterly Progress Report, Period Covering January 1, 2009 – March 31, 2009, Margaret N. Rees

Get Outdoors Nevada

  • The number of records in the volunteer database increased by 3.5%.
  • A total of 1,676 database records were archived due to inactivity resulting in a reduction of 26% in the number of current records in the database. The database currently contains 4,957 records.
  • Website activity increased, recording an average of 68,086 hits per month, an increase of 22 % from last quarter, with an average of 5,228 pages viewed per month.
  • The new website design was launched along with the release of a monthly electronic newsletter.
  • How to Succeed with Volunteers training was conducted for SNAP teams and well received …


Heterogeneity Effects In Plutonium Contaminated Soil, Orlando M. Chaparro Mar 2009

Heterogeneity Effects In Plutonium Contaminated Soil, Orlando M. Chaparro

Theses and Dissertations

In 1960 at the McGuire Air Force Base, New Egypt, New Jersey a helium tank ruptured causing a fire to ignite a nearby nuclear tipped Boeing Michigan Aeronautical Research Center (BOMARC) missile. During the fire the weapons grade plutonium (Pu- 239, Pu-240, and Pu-241) ignited and was released into the surrounding area, due to both firefighting efforts, where high pressure water was used to put out the fire, as well as smoke that deposited plutonium as oxidized particles in the surrounding area (Cicotte, 2007). This study investigates the heterogeneity of the distributed plutonium contamination in the McGuire Air Force Base …


Refuge Update – March/April 2009, Volume 6, Number 2 Mar 2009

Refuge Update – March/April 2009, Volume 6, Number 2

RefugeUpdate (USFWS-NWRS)

Table of Contents:
America’s Birds: In an Alarming State
Snakes Alive!
Title Sub Title East Coast Wetlands Are Disappearing
Chief’s Corner: What We Do Now
Extreme Makeover for Bird Sightings by Mike Carlo
Taking Care of Our World War II Legacy by Lisa Matlock
Whatever Happened to . . . . San Francisco Bay Wetland Restoration Projects
Recalling the Battle of Long Island Sound by David Klinger
Bold Approaches for Climate Change
How Alligator River Refuge Is Planning and Adapting by Mike Bryant
Rapid Climate Change Is Transforming the Arctic by David Payer
Tracking Change on Wildlife Refuges by Kathy …


Nutrient And Fecal Microbe Sources For A Eutrophic Lake And Recommended Remediation Steps, Wilgreen Lake, Madison County, Kentucky, Walter S. Borowski, Theresa A. Aguiar, Jill Hunter, Erin C. Jolly, Richard D. Stockwell Mar 2009

Nutrient And Fecal Microbe Sources For A Eutrophic Lake And Recommended Remediation Steps, Wilgreen Lake, Madison County, Kentucky, Walter S. Borowski, Theresa A. Aguiar, Jill Hunter, Erin C. Jolly, Richard D. Stockwell

EKU Faculty and Staff Scholarship

Wilgreen Lake is a man-made lake, classified as nutrient-impaired (303d list) by the EPA and State of Kentucky. The lake drains a watershed with residential developments, cattle pasture, modified woodlands, and some industrial/urban usage in the city of Richmond. The principal tributaries are Taylor Fork and Old Town Branch that meet to form the trunk of the lake approximately one mile in length. The upper reaches of Taylor Fork are adjacent to a densely-packed (quarter-acre lots) housing development with septic systems, and its watershed drains some portions of southern Richmond. Old Town Branch drains cattle pasture and residential areas of …


The Functions And Values Of Fringing Salt Marshes In Northern New England, Usa, Pamela A. Morgan, David M. Burdick, Frederick T. Short Feb 2009

The Functions And Values Of Fringing Salt Marshes In Northern New England, Usa, Pamela A. Morgan, David M. Burdick, Frederick T. Short

Environmental Studies Faculty Publications

Although large salt marshes of the northeastern United States have been studied extensively, very little is known about the smaller, fringing marshes in this area, despite the fact that they are a common habitat type. We compared the functions and values of five fringing salt marshes (FM) to those of five meadow marshes (MM) along the southern Maine/New Hampshire coast. Specifically we compared their primary production, soil organic matter content, plant diversity, sediment trapping ability and wave dampening properties. Also explored were the relationships between these functions and several physical characteristics at each site, including soil salinity, percent surface slope, …