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Fresh Water Studies

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2013

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Full-Text Articles in Physical Sciences and Mathematics

Judy Reservoir Monitoring Project 2013 Final Report, Robin A. Matthews, Joan Vandersypen Dec 2013

Judy Reservoir Monitoring Project 2013 Final Report, Robin A. Matthews, Joan Vandersypen

Judy Reservoir

The purpose of this study was to identify and count the phytoplankton and measure chlorophyll, total nitrogen, and total phosphorus levels in water samples collected from Judy Reservoir. Water quality and algal data have been collected on a weekly basis since October 2006; annual reports have been sent to the Skagit Public Utility District No. 1 in 2007, 2008, 2010 (January and December), 2011, and 2012. This project ended in 2013; the final chemistry sample was collected May 2, 2013 and the final algae sample was collected November 6, 2013.


Water Quality Monitoring For Selected Priority Watersheds In Arkansas, Upper Saline, Poteau And Strawberry Rivers, L. B. Massey, J.A. Mccarty, M.D. Matlock, A.N. Sharpley, B.E. Haggard Dec 2013

Water Quality Monitoring For Selected Priority Watersheds In Arkansas, Upper Saline, Poteau And Strawberry Rivers, L. B. Massey, J.A. Mccarty, M.D. Matlock, A.N. Sharpley, B.E. Haggard

Technical Reports

Arkansas Natural Resources Commission has identified three priority hydrological unit code (HUC) 8 watersheds, the Upper Saline (HUC 08040203), Poteau (HUC 11110105), and Strawberry Watersheds (HUC 11010012). SWAT models have been developed to estimate nutrient and sediment loads in these watersheds where limited water‐quality data was available. The purpose of this project was to collect additional water samples across these HUC 8 watersheds to better understand how water quality changes across subwatershed with differing land use mixes, as well as estimate nitrate‐nitrogen (NO3‐N), total phosphorus (TP), and total suspended sediment (TSS) loads. Water samples were collected at twenty sites near …


Umphlett Qci Dec 2013, Natalie A. Umphlett Dec 2013

Umphlett Qci Dec 2013, Natalie A. Umphlett

HPRCC Personnel Publications

Highlights for the Basin

Temperature and Precipitation Anomalies

Soil Moisture

September Flooding in Colorado

Early October Blizzard

3-Month Precipitation and Temperature Outlooks

U.S. Seasonal Drought Outlook


Reed Lake 2013 Aquatic Plant Survey, Samantha Merrick, Robin A. Matthews, Joan Vandersypen Oct 2013

Reed Lake 2013 Aquatic Plant Survey, Samantha Merrick, Robin A. Matthews, Joan Vandersypen

Reed Lake

The main objective of this project was to collect and identify aquatic plants in Reed Lake, a small, shallow lake in Whatcom County. The project was undertaken with the assistance of volunteers from the Glenhaven Lakes community (Figure 1). Residents of the Glenhaven community have expressed concerns about the effects that aquatic plants are having on recreation in the lake. This report included maps showing the types of plants that were collected in the lake Figures 2–10 and estimated plant densities (Figures 11–13), with a short discussion of methods that might be useful for reducing aquatic plant densities in the …


Planning And Drought, James C. Schwab Oct 2013

Planning And Drought, James C. Schwab

National Drought Mitigation Center: Publications

TABLE OF CONTENTS

Chapter 1: Drought: The Problem.............................................. 1

Water Impacts ............................................................................... 2

Public Health Impacts ......................................................... 4

Environmental Impacts ..................................................... 5

Built Environment Impacts................................................ 6

Secondary Hazards ......................................................... 9

Economic Impacts ................................................................... 10

Drought as a Challenge for Planners .......................................... 13

Chapter 2: Drought: The Knowledge Base ................................................... 15

Spatial and Seasonal Patterns of Drought ................................................................ 16

Drought and Climate Changes .................................................................................. 19

Tracking Drought: Tools and Resources ................................................................... 20

Using the Drought Resources Toolbox...................................................................... 22


Oregon Dreissenid Mussel: Rapid Response Plan, Robyn Draheim, Rick Boatner, Glenn Dolphin, Lisa Debruyckere Oct 2013

Oregon Dreissenid Mussel: Rapid Response Plan, Robyn Draheim, Rick Boatner, Glenn Dolphin, Lisa Debruyckere

Center for Lakes and Reservoirs Publications and Presentations

In 2007, both zebra mussels (Dreissena polymorpha) and quagga mussels (Dreissena rostriformis bugensis) were found to have established populations west of the Rocky Mountains. The risk posed to the Pacific Northwest by the proximity of these new infestations is significant. This plan was developed in response to the increasing likelihood of the successful transport and introduction of these species into the State of Oregon and Pacific Northwest. Although prevention remains the most cost-effective means of addressing potential infestations of aquatic invasive species, if prevention efforts fail, the State of Oregon must be prepared to respond rapidly …


Droughtscape- Fall 2013, National Drought Mitigation Center Oct 2013

Droughtscape- Fall 2013, National Drought Mitigation Center

Droughtscape, Quarterly Newsletter of NDMC, 2007-

CONTENTS

Director’s Report ....................1

Kansas community drought planning workshop Nov. 5 ...... 2

Drought impacts webinars .....3

Drought outlook & summary ... 4

Late summer drought brings more agricultural impacts ....... 6

Plans help ranchers weather drought ................................. 10

NDMC contributions to U2U project ..................................12

Drought Management Database archives strategies................13

QuickDRI will help spot flash droughts................................ 14

NDMC Co-Hosts NASA work- shop......................................15

Wilhite leads Integrated Drought Management Program work....... 15

Speaking of drought ............ 16

Managing #Drought tweet chat transcript ..............................17

Updated USDM website ....... 17


Issue Brief: Saving By Mitigating, University Of Louisville, New England Environmental Finance Center Sep 2013

Issue Brief: Saving By Mitigating, University Of Louisville, New England Environmental Finance Center

Sustainable Communities Capacity Building

Natural disasters can cause loss of life, inflict damage to buildings and infrastructure, and have devastating consequences for a community’s economic, social, and environmental well-being. Hazard mitigation means reducing damages from disasters.

Local governments have the responsibility to protect the health, safety, and welfare of their citizens. Proactive mitigation policies and actions help reduce risk and create safer, more disaster-resilient communities. Mitigation is an investment in your community’s future safety, equity, and sustainability.


Birch Bay Village Lakes 2013 Final Report, Robin A. Matthews, Joan Vandersypen Aug 2013

Birch Bay Village Lakes 2013 Final Report, Robin A. Matthews, Joan Vandersypen

Birch Bay/Village Lakes

The Institute for Watershed Studies was contracted by the Birch Bay Village Lakes Committee to continue water testing at two sites in Kwan Lake and two sites in Thunderbird Lake (Figure 1, page 4). The sampling effort began in August 2007, and samples have been collected approximately 2–4 times each year through August 2013. This report provides an update to earlier data reports submitted to the Birch Bay Village Lakes Committee.


Climate Change On The Prairie: A Basic Guide To Climate Change In The High Plains Region - Update, Lincoln, Ne Aug 2013

Climate Change On The Prairie: A Basic Guide To Climate Change In The High Plains Region - Update, Lincoln, Ne

HPRCC Personnel Publications

Global Climate Change

Climate Change in the United States

Historical Climate Trends in the High Plains Region

Historical Climate Trends in the High Plains Region

High Plains Region Update: 2010-2012

New Tool: Climate Impact Reporter

Climate Change Projections and Possible Impacts

Climate Change Projections and Possible Impacts


Droughtscape- Summer 2013, National Drought Mitigation Center Jul 2013

Droughtscape- Summer 2013, National Drought Mitigation Center

Droughtscape, Quarterly Newsletter of NDMC, 2007-

CONTENTS

Director’s Report ....................1

July 25 webinar: Drought management database, NIDIS update..................................... 2

Republican River Basin workshops July 31, August 1.......... 3

Summer climate outlook, spring summary ................................. 4

Spring impacts: wildfire, water, agriculture and business.........6

Data help managers assess Nebraska groundwater declines after drought of 2012........... 10

Tadesse helps Mexico with Veg- DRI concept..........................14

Visiting scholar explores remote sensing of drought in forests....... 15

U.S. Drought Monitor Forum photo recap, details online............ 16

Workshop helps New Mexico ranchers cope with drought ........... 18

Alabama’s new drought plan......... 19

National Drought Forum report........... 19

Drought Impacts Community of Practice report …


Fish Species Distribution In Seagrass Habitats Of Chesapeake Bay Are Structured By Abiotic And Biotic Factors, Jason J. Schaffler, Jacques Van Montfrans, Cynthia M. Jones, Robert J. Orth Jul 2013

Fish Species Distribution In Seagrass Habitats Of Chesapeake Bay Are Structured By Abiotic And Biotic Factors, Jason J. Schaffler, Jacques Van Montfrans, Cynthia M. Jones, Robert J. Orth

OES Faculty Publications

Seagrass habitats have long been known to serve as nursery habitats for juvenile fish by providing refuges from predation and areas of high forage abundance. However, comparatively less is known about other factors structuring fish communities that make extensive use of seagrass as nursery habitat. We examined both physical and biological factors that may structure the juvenile seagrass-associated fish communities across a synoptic-scale multiyear study in lower Chesapeake Bay. Across 3years of sampling, we collected 21,153 fish from 31 species. Silver Perch Bairdiella chrysoura made up over 86% of all individuals collected. Nine additional species made up at least 1% …


Ecological Design In The Ozarks - Workshop And Lake Frances Charrette, Steven D. Patterson, Brian E. Haggard, Mark E. Boyer May 2013

Ecological Design In The Ozarks - Workshop And Lake Frances Charrette, Steven D. Patterson, Brian E. Haggard, Mark E. Boyer

Technical Reports

No abstract provided.


Aquatic Invasive Plant Surveys In The Blm Medford District During 2012, Rich Miller, Vanessa Morgan, Mark D. Sytsma Apr 2013

Aquatic Invasive Plant Surveys In The Blm Medford District During 2012, Rich Miller, Vanessa Morgan, Mark D. Sytsma

Center for Lakes and Reservoirs Publications and Presentations

Aquatic plant surveys were conducted at 22 waterbodies located within the Bureau of Land Management’s Medford District during the summer of 2012. Sites included eleven lakes, ponds or reservoirs and six reaches along the Rogue and Applegate Rivers. Five sampling areas surveyed during 2010 and 2011 were revisited to determine the extent of known non-native species infestations, positively identify rare species, or verify the absence of an expected non-native species. Plant specimens were collected at up to 50 sites at each waterbody using plant rakes or by observation. The non-native submersed species curly leaf pondweed (Potamogeton crispus) and …


Droughtscape- Spring 2013, National Drought Mitigation Center Apr 2013

Droughtscape- Spring 2013, National Drought Mitigation Center

Droughtscape, Quarterly Newsletter of NDMC, 2007-

CONTENTS

Director’s report........................................................................................................1

First quarter climate summary and outlook ........................................................... 2

Impacts: Crop indemnities set records in 2012; water conflicts escalating ............ 4

International meeting recommends countries have drought policies ..................... 8

NDMC plays key role in international drought policy meeting ............................. 9

EDEN and VOAD guide helps build community drought capacity.....................10

Svoboda, other experts and policymakers focus on food and water security.......11

New Mexico ranching workshop set for May 29 in Socorro ................................. 12

Ranch planning updates: archived webinars, new publications ........................... 12

Tune in to the US Drought Monitor Forum, April 16-18.....................................13

Archived webinar looks at using drought …


Continuous Monitoring Reveals Multiple Controls On Ecosystem Metabolism In A Suburban Stream, Jake J. Beaulieu, Clay P. Arango, David A. Balz, William D. Shuster Mar 2013

Continuous Monitoring Reveals Multiple Controls On Ecosystem Metabolism In A Suburban Stream, Jake J. Beaulieu, Clay P. Arango, David A. Balz, William D. Shuster

Biology Faculty Scholarship

1. Primary production and respiration in streams, collectively referred to as stream ecosystem metabolism, are fundamental processes that determine trophic structure, biomass and nutrient cycling. Few studies have used high‐frequency measurements of gross primary production (GPP) and ecosystem respiration (ER) over extended periods to characterise the factors that control stream ecosystem metabolism at hourly, daily, seasonal and annual scales.

2. We measured ecosystem metabolism at 5‐min intervals for 23 months in Shepherd Creek, a small suburban stream in Cincinnati, Ohio (U.S.A.).

3. Daily GPP was best predicted by a model containing light and its synergistic interaction with water temperature. Water …


Assessment Of A Rotenone Application Event At Mormon Island West Lake In Central Nebraska, Keith D. Koupal, Brian C. Peterson, Casey W. Schoenebeck Mar 2013

Assessment Of A Rotenone Application Event At Mormon Island West Lake In Central Nebraska, Keith D. Koupal, Brian C. Peterson, Casey W. Schoenebeck

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Fisheries managers applied rotenone to Mormon Island West in August of 2010 to renovate a fish community that was hypothesized to be unbalanced (i.e., dominated with gizzard shad and common carp) based on standardized survey results. We estimated species-specific biomass following the lake renovation to provide a baseline biomass estimate for a sand pit lake and to evaluate the effectiveness of standardized sampling gears. Gizzard shad (Dorosoma cepedianum) were abundant in all sampling gears, but mostly stock-size (>175 mm total length) and larger individuals were caught in gill and trap nets and sub-stock (≤175 mm total length) …


Active Fluorometry Improves Nutrient-Diffusing Substrata Bioassay, Sarah Whorley, Steven Francoeur Mar 2013

Active Fluorometry Improves Nutrient-Diffusing Substrata Bioassay, Sarah Whorley, Steven Francoeur

Articles & Book Chapters

Benthic algal nutrient bioassays traditionally have been done by measuring periphytic algal biomass that has grown on fertilized or unfertilized patches of habitat produced by nutrient-diffusing substrata (NDS). This method requires destruction of the accumulated periphyton communities and, thus, does not allow for convenient monitoring through time. Variable fluorescence methods of estimating algal biomass and photosynthetic activity have been used in aquatic environments, but generally not over different nutrient treatments and not for a substantial duration. We evaluated the use of a pulse amplitude modulated (PAM) fluorometer for measuring algal biomass and photosynthetic activity in conjunction with NDS over several …


Aquatic Invasive Species Surveys Of Upper Klamath Lake, Fourmile Lake, And Lake Of The Woods, Or During 2012, Rich Miller, Mark D. Sytsma Mar 2013

Aquatic Invasive Species Surveys Of Upper Klamath Lake, Fourmile Lake, And Lake Of The Woods, Or During 2012, Rich Miller, Mark D. Sytsma

Center for Lakes and Reservoirs Publications and Presentations

Three lakes located within the Klamath River Basin in Oregon (Upper Klamath Lake, Fourmile Lake, and Lake of the Woods) were surveyed for aquatic invasive species during the summer of 2012. Specimens were collected using plant rakes, benthic dredges, plankton nets, and crayfish traps. No invasive aquatic plants, gastropods, snails, bivalves or crayfish were detected in the lakes.


Aquatic Invasive Species Surveys Of Pacificorp’S North Umpqua River Impoundments, Rich Miller, Mark D. Sytsma, Vanessa Howard Morgan Feb 2013

Aquatic Invasive Species Surveys Of Pacificorp’S North Umpqua River Impoundments, Rich Miller, Mark D. Sytsma, Vanessa Howard Morgan

Center for Lakes and Reservoirs Publications and Presentations

Ten North Umpqua Hydroelectric Project impoundments were surveyed for aquatic invasive species during the summer of 2012. One non-native submersed aquatic vegetation species (Potamogeton crispus) and one non-native snail species (Radix auricularia) was detected. No crayfish or mussel veligers were collected and no non-native zooplankton species were encountered.


Regional Climate Trends And Scenarios For The U.S. National Climate Assessment Part 4. Climate Of The U.S. Great Plains, Kenneth E. Kunkel, Laura E. Stevens, Scott E. Stevens, Liqiang Sun, Emily Janssen, Donald Wuebbles, Michael C. Kruk, Devin Thomas, Martha Shulski, Natalie A. Umphlett, Kenneth G. Hubbard, Kevin Robbins, Luigi Romolo, Adnan Akyuz, Tapan B. Pathak, Tony R. Bergantino, J. Greg Dobson Jan 2013

Regional Climate Trends And Scenarios For The U.S. National Climate Assessment Part 4. Climate Of The U.S. Great Plains, Kenneth E. Kunkel, Laura E. Stevens, Scott E. Stevens, Liqiang Sun, Emily Janssen, Donald Wuebbles, Michael C. Kruk, Devin Thomas, Martha Shulski, Natalie A. Umphlett, Kenneth G. Hubbard, Kevin Robbins, Luigi Romolo, Adnan Akyuz, Tapan B. Pathak, Tony R. Bergantino, J. Greg Dobson

HPRCC Personnel Publications

This document is one of series of regional climate descriptions designed to provide input that can be used in the development of the National Climate Assessment (NCA). As part of a sustained assessment approach, it is intended that these documents will be updated as new and well-vetted model results are available and as new climate scenario needs become clear. It is also hoped that these documents (and associated data and resources) are of direct benefit to decision makers and communities seeking to use this information in developing adaptation plans.

There are nine reports in this series, one each for eight …


Final Coastal Lakes Aquatic Plant Survey Report, Mary Pfauth, Mark Sytsma Jan 2013

Final Coastal Lakes Aquatic Plant Survey Report, Mary Pfauth, Mark Sytsma

Center for Lakes and Reservoirs Publications and Presentations

Invasive, non-indigenous plants can degrade water quality and fish habitat when they invade lakes, ponds, and streams. Changes in plant community architecture in lakes due to invasion by canopy-forming invasive aquatic plants can result in loss of native plant biodiversity and reduction of the structural complexity of the underwater habitat.


Occurrence Of Antimicrobials And Antimicrobial Resistance Genes In Beef Cattle Storage Ponds And Swine Treatment Lagoons, Yuping Zhang, Chiqian Zhang, David B. Parker, Daniel D. Snow, Zhi Zhou, Xu Li Jan 2013

Occurrence Of Antimicrobials And Antimicrobial Resistance Genes In Beef Cattle Storage Ponds And Swine Treatment Lagoons, Yuping Zhang, Chiqian Zhang, David B. Parker, Daniel D. Snow, Zhi Zhou, Xu Li

Nebraska Water Center: Faculty Publications

Livestock manure treatment and storage structures are potential environmental sources of antimicrobials and antimicrobial resistance genes (ARGs). In this study, the occurrence of antimicrobials and ARGs was investigated in the water and the sludge compartments of beef cattle storage ponds and swine lagoons. Analysis was focused on two families of antimicrobials (sulfonamide and tetracycline) and the corresponding ARGs (sul1, sul2, tetO, tetQ and tetX). Results showed that the pseudo-partitioning coefficients of tetracyclines were higher than those of sulfonamides, suggesting different distributions of these two classes of antimicrobials between water and sludge. The ARGs tested were …


Droughtscape- Winter 2013, Kelly Smith Jan 2013

Droughtscape- Winter 2013, Kelly Smith

Droughtscape, Quarterly Newsletter of NDMC, 2007-

CONTENTS

Director’s report...................................................................................1

Climatological overview of drought in 2012 ...................................... 2

Climatological overview of drought, Oct.-Dec. 2012.........................5

Impacts of drought in 2012 ................................................................. 6

Drought planning webinars scheduled for ranch advisors ..............10

UNL honors NDMC for exceptional service ...................................10

Report from the emerging community of drought planners ...........11

Feb. 6 webinar on drought simulations ............................................ 11

Climate Masters course starting ......................................................12

Climate Change in the Midwest book includes drought ................12

Video highlights from coverage of drought of 2012..........................13

U.S. Drought Monitor Forum 2013 .................................................. 13

UN’s High Level Meeting on National Drought Policy .................... 14

NDMC collaboration with India, Czech …


Osmb Ais Funds Final Report: Task 1 Boat Ramp Monitoring For New Zealand Mud Snails, Valance Brenneis, Samuel Cimino, Angela L. Strecker Jan 2013

Osmb Ais Funds Final Report: Task 1 Boat Ramp Monitoring For New Zealand Mud Snails, Valance Brenneis, Samuel Cimino, Angela L. Strecker

Center for Lakes and Reservoirs Publications and Presentations

The New Zealand mud snail (Potamopyrgus antipodarum; NZMS) is an invasive species found in a variety of ecosystems in Oregon, including brackish estuaries, heavily used recreational rivers, and highly trafficked coastal freshwater lakes. NZMS are an invasive species of concern because once established, they may out-compete native invertebrate grazers, such as native insect larvae that provide important food resources for fish, and NZMS themselves provide little nutritional value. Monitoring for the presence and population density of NZMS was performed at boat ramps located along several water bodies in 2006 – 2007. These water bodies were then re-sampled during the summer …


Estimating Greenhouse Gas Emissions From A Waste Lagoon, Arturo I. Quintanar, Rezaul Mamood, Nanh Lovanh, Justin M. Rawley, Evi Becerra-Acosta, John H. Loughrin Jan 2013

Estimating Greenhouse Gas Emissions From A Waste Lagoon, Arturo I. Quintanar, Rezaul Mamood, Nanh Lovanh, Justin M. Rawley, Evi Becerra-Acosta, John H. Loughrin

HPRCC Personnel Publications

A cost-effective approach was used to investigate the relationship between emission of the greenhouse gases (GHG), namely, CO2, CH4, and N2O and energy fluxes from a swine waste lagoon. Energy fluxes were calculated using the Penman method. The energy fluxes showed a diurnal pattern as expected of such fluxes. We found that air temperature and latent energy, lagoon surface temperature and solar radiation, as well as air temperature and wind speed can be used to predict for CO2, CH4, and N2O emissions, respectively. Comparison of observed and predicted …


Climate Change: What Does It Mean For Nebraska?, Martha D. Shulski, Natalie A. Umphlett, Tapan B. Pathak, Kenneth G. Hubbard Jan 2013

Climate Change: What Does It Mean For Nebraska?, Martha D. Shulski, Natalie A. Umphlett, Tapan B. Pathak, Kenneth G. Hubbard

HPRCC Personnel Publications

Because Nebraska’s location on the North American continent is far removed from large bodies of water, Nebraskans experience a strong continental type climate. As such, residents do not benefit from the moderating influence of the ocean, and temperatures can have wide swings from day to day and season to season. Typical characteristics for a continental climate at this latitude are large temperature variability with warm summers dominated by convective thunderstorms, and cold winters influenced by snow and wind from mid-latitude cyclones.


A Preliminary Examination Of An In Situ Dual Dye Approach To Measuring Light Fluxes In Lotic Systems, Elizabeth C. Minor, Elizabeth James, Jay A. Austin, Veronica Nelson, Ryan Lusk, Kenneth Mopper Jan 2013

A Preliminary Examination Of An In Situ Dual Dye Approach To Measuring Light Fluxes In Lotic Systems, Elizabeth C. Minor, Elizabeth James, Jay A. Austin, Veronica Nelson, Ryan Lusk, Kenneth Mopper

Chemistry & Biochemistry Faculty Publications

Light is a critical parameter in aquatic ecosystems, affecting primary production and in situ photochemistry. However, measuring light exposure for suspended particles or dissolved components in a dynamic water column can be challenging with existing Eulerian approaches. Here, we assess the simultaneous deployment of two dyes differing in photolability (rhodamine WT and fluorescein) as a Lagrangian measure of sunlight exposure in a lotic system. Fluorescein is sensitive to light exposure; rhodamine WT is relatively photostable. We examined dye fluorescence at various pH, salinity, and temperature conditions. We also tested dye photolability as a function of pH and wavelength range. In …


Recurrent Flooding Study For Tidewater Virginia, Molly Mitchell, Carl Hershner, Julie Herman, Daniel E. Schatt, Emily Eggington, Center For Coastal Resources Management, Virginia Institute Of Marine Science Jan 2013

Recurrent Flooding Study For Tidewater Virginia, Molly Mitchell, Carl Hershner, Julie Herman, Daniel E. Schatt, Emily Eggington, Center For Coastal Resources Management, Virginia Institute Of Marine Science

Reports

No abstract provided.


Riparian Evapotranspiration In Nebraska, Brent M. Hall, David L. Rus Jan 2013

Riparian Evapotranspiration In Nebraska, Brent M. Hall, David L. Rus

United States Geological Survey: Water Reports and Publications

With increasing demands being placed on the water resources of Nebraska, characterizing evapotranspiration (ET) from riparian vegetation has gained importance to water users and managers. This report summarizes and compares the results from several studies of the ET from cottonwood-dominated riparian forests, riparian grasslands, and common reed, Phragmites australis, in Nebraska. Reported results show that the highest seasonal ET amounts were associated with Phragmites australis, followed by riparian forests, with riparian grasslands experiencing the lowest total ET of the studied vegetation communities.