A Review on the Effect of Habitat Fragmentation on Ecosystem
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Fish-Passage Facilities As Ecological Traps in Large Neotropical Rivers
Contributed Paper Fish-Passage Facilities as Ecological Traps in Large Neotropical Rivers FERNANDO MAYER PELICICE∗‡ AND ANGELO ANTONIO AGOSTINHO† ∗Graduate Course in Ecology of Inland Aquatic Ecosystems, Maring´a State University, Maring´a, Paran´a, Brazil †Department of Biology/NUPELIA, Maring´a State University, Maring´a, Paran´a, Brazil Abstract: At present most of the large rivers of South America are impounded. Management plans historically have relied on the construction of fish passages, specifically ladders, to mitigate the impact of these waterway blockages on fisheries and biodiversity. Nevertheless, the design of these facilities is not ecologically sound and they are not monitored continually. Consequently, the real role of South American fish passages in fisheries and biodiversity management is unclear and the results of some studies suggest that ladders are problematic in fish conservation. We examined the characteristics and negative aspects of fish passages within a larger context and considered the notion that these facilities are ecological traps in some Brazilian impoundments. Four conditions are required to characterize a fish passage as an ecological trap: (1) attractive forces leading fish to ascend the passage; (2) unidirectional migratory movements (upstream); (3) the environment above the passage has poor conditions for fish recruitment (e.g., the absence of spawning grounds and nursery areas); and (4) the environment below the passage has a proper structure for recruitment. When these conditions exist individuals move to poor-quality habitats, fitness is reduced, and populations are threatened. To exemplify this situation we analyzed two case studies in the upper Parana´ River basin, Brazil, in which the four conditions were met and migratory fish populations were declining. -
Determination of Tucson, Arizona As an Ecological Trap for Cooper's Hawks
Determination of Tucson, Arizona as an Ecological Trap for Cooper's Hawks (Accipiter cooperii) Jouie Ames1, Andrea Feiler2, Giancarlo Mendoza3, Adam Rumpf2, Stephen Wirkus2 1University of California, Santa Cruz, 2Arizona State University, 3Universidad Metropolitana P.R. August 2011 Abstract The term \ecological trap" has been used to describe a habitat in which its attrac- tiveness has been disassociated with its level of suitability. To date, fewer than ten clearly delineated examples of them have been found; they are either rare in nature, hard to detect, or a combination of both. It has been hypothesized that the city of Tucson, Arizona is an ecological trap for Cooper's Hawks (Accipiter cooperii) due to the abundance of prey species, namely columbids, which make up over 80% of the hawk's diet. Overall, more than 40% of these columbid populations are carriers of the protozoan Trichomonas gallinae, which directly contributes to a nestling mortal- ity rate of more than 50% in the hawks. Using an epidemiological framework, we create two SIR-type models, one stochastic and one deterministic, utilizing parame- ter estimates from more than ten years of data from the dove (columbid) and hawk populations in the city. Through mathematical modeling and bifurcation theory, we found that the proportion of infected columbids, does not have an effect on classifying Tucson as an ecological trap for Cooper's Hawks, but by increasing the disease death rate, it can be considered an ecological trap. 1 1 Introduction When the term \ecological trap" was first coined in 1972 by Dwernychuk and Boag [1], it was originally used to describe a natural trap in ones habitat but now is used almost exclusively to refer to anthropogenically induced traps [1,2]. -
What Characteristics Do All Invasive Species Share That Make Them So
Invasive Plants Facts and Figures Definition Invasive Plant: Plants that have, or are likely to spread into native or minimally managed plant systems and cause economic or environmental harm by developing self-sustaining populations and becoming dominant or disruptive to those systems. Where do most invasive species come from? How do they get here and get started? Most originate long distances from the point of introduction Horticulture is responsible for the introduction of approximately 60% of invasive species. Conservation uses are responsible for the introduction of approximately 30% of invasive species. Accidental introductions account for about 10%. Of all non-native species introduced only about 15% ever escape cultivation, and of this 15% only about 1% ever become a problem in the wild. The process that leads to a plant becoming an invasive species, Cultivation – Escape – Naturalization – Invasion, may take over 100 years to complete. What characteristics make invasive species so successful in our environment? Lack predators, pathogens, and diseases to keep population numbers in check Produce copious amounts of seed with a high viability of that seed Use successful dispersal mechanisms – attractive to wildlife Thrive on disturbance, very opportunistic Fast-growing Habitat generalists. They do not have specific or narrow growth requirements. Some demonstrate alleleopathy – produce chemicals that inhibit the growth of other plants nearby. Have longer photosynthetic periods – first to leaf out in the spring and last to drop leaves in autumn Alter soil and habitat conditions where they grow to better suit their own survival and expansion. Why do we care? What is the big deal? Ecological Impacts Impacting/altering natural communities at a startling rate. -
A Survey of the Nation's Lakes
A Survey of the Nation’s Lakes – EPA’s National Lake Assessment and Survey of Vermont Lakes Vermont Agency of Natural Resources Department of Environmental Conservation - Water Quality Division 103 South Main 10N Waterbury VT 05671-0408 www.vtwaterquality.org Prepared by Julia Larouche, Environmental Technician II January 2009 Table of Contents List of Tables and Figures........................................................................................................................................................................... ii Introduction................................................................................................................................................................................................. 1 What We Measured..................................................................................................................................................................................... 4 Water Quality and Trophic Status Indicators.......................................................................................................................................... 4 Acidification Indicator............................................................................................................................................................................ 4 Ecological Integrity Indicators................................................................................................................................................................ 4 Nearshore Habitat Indicators -
Analysis of Habitat Fragmentation and Ecosystem Connectivity Within the Castle Parks, Alberta, Canada by Breanna Beaver Submit
Analysis of Habitat Fragmentation and Ecosystem Connectivity within The Castle Parks, Alberta, Canada by Breanna Beaver Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Science in the Environmental Science Program YOUNGSTOWN STATE UNIVERSITY December, 2017 Analysis of Habitat Fragmentation and Ecosystem Connectivity within The Castle Parks, Alberta, Canada Breanna Beaver I hereby release this thesis to the public. I understand that this thesis will be made available from the OhioLINK ETD Center and the Maag Library Circulation Desk for public access. I also authorize the University or other individuals to make copies of this thesis as needed for scholarly research. Signature: Breanna Beaver, Student Date Approvals: Dawna Cerney, Thesis Advisor Date Peter Kimosop, Committee Member Date Felicia Armstrong, Committee Member Date Clayton Whitesides, Committee Member Date Dr. Salvatore A. Sanders, Dean of Graduate Studies Date Abstract Habitat fragmentation is an important subject of research needed by park management planners, particularly for conservation management. The Castle Parks, in southwest Alberta, Canada, exhibit extensive habitat fragmentation from recreational and resource use activities. Umbrella and keystone species within The Castle Parks include grizzly bears, wolverines, cougars, and elk which are important animals used for conservation agendas to help protect the matrix of the ecosystem. This study identified and analyzed the nature of habitat fragmentation within The Castle Parks for these species, and has identified geographic areas of habitat fragmentation concern. This was accomplished using remote sensing, ArcGIS, and statistical analyses, to develop models of fragmentation for ecosystem cover type and Digital Elevation Models of slope, which acted as proxies for species habitat suitability. -
Toward Understanding the Ecological Impact of Transportation Corridors
United States Department of Agriculture Toward Understanding Forest Service the Ecological Impact of Pacific Northwest Research Station Transportation Corridors General Technical Report PNW-GTR-846 Victoria J. Bennett, Winston P. Smith, and July 2011 Matthew G. Betts D E E P R A U R T LT MENT OF AGRICU The Forest Service of the U.S. Department of Agriculture is dedicated to the principle of multiple use management of the Nation’s forest resources for sustained yields of wood, water, forage, wildlife, and recreation. Through forestry research, cooperation with the States and private forest owners, and management of the National Forests and National Grasslands, it strives—as directed by Congress—to provide increasingly greater service to a growing Nation. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or part of an individual’s income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA’s TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write USDA, Director, Office of Civil Rights, 1400 Independence Avenue, SW, Washington, DC 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. Authors Victoria J. -
Response of Endangered Mt. Graham Red Squirrels to Severe Insect Infestation
Trailblazers in the Forest: Response of Endangered Mt. Graham Red Squirrels to Severe Insect Infestation Item Type text; Electronic Thesis Authors Zugmeyer, Claire Ann Publisher The University of Arizona. Rights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Download date 23/09/2021 14:33:31 Link to Item http://hdl.handle.net/10150/193336 TRAILBLAZERS IN THE FOREST: RESPONSE OF ENDANGERED MT. GRAHAM RED SQUIRRELS TO SEVERE INSECT INFESTATION by Claire Ann Zugmeyer ________________________ A Thesis Submitted to the faculty of the SCHOOL OF NATURAL RESOURCES In Partial fulfillment of the Requirements For the Degree of MASTERS OF SCIENCE WITH A MAJOR IN WILDLIFE AND FISHERIES SCIENCES In the Graduate College THE UNIVERSITY OF ARIZONA 2007 2 STATEMENT BY AUTHOR This thesis has been submitted in partial fulfillment of requirements for an advanced degree at The University of Arizona and is deposited in the University Library to be made available to borrowers under rules of the Library. Brief quotations from this thesis are allowable without special permission, provided that accurate acknowledgment of source is made. Requests for permission for extended quotation from or reproduction of this manuscript in whole or in part may be granted by the head of the major department or the Dean of the Graduate College when in his or her judgment the proposed use of the material is in the interests of scholarship. -
Food Web Invaders
TEACHER LESSON PLAN Food Web Invaders Grade Length Subjects/strands Topics 4th–8th grade 20–30 minutes Discover how a food Observation, applica- web works by making tion, comparing similari- a live model of biotic ties and differences, gen- components, using the eralization, kinesthetic people in your class. concept development, Then explore how an psycho-motor develop- invasive species disrupts ment that balance. BACKGROUND INTRODUCTION Students will have been introduced to the idea of an ecosystem, and the basic relationships in an ecosys- In this fun, active-learning, game about food webs, tem such as producers and consumers, herbivores and each student is assigned to be a plant or animal that carnivores, predator/prey pairs, and some of the inter- can be found in aquatic ecosystems. Then, they learn relationships of their behavior and adaptations. Middle about the relationships between organisms as they pass school students will have been introduced to the idea of a ball of yarn between students (organisms) that have a limiting factors, and later the idea of carrying capac- predator/prey relationship. As the ball of yarn unravels ity. Students will also be familiar with the concept of a and the string is stretched between the many predator/ food chain with a variety of trophic levels. At the inter- prey relationships in the room, the large and complex mediate level, this could include videos, field activities food web network is reveals visually and symbolically and artwork, as well as reading and writing activities in the room. In the final step, an invasive species is from student magazines and textbooks. -
Habitat Fragmentation Analysis of Boulder County
Habitat Fragmentation Analysis of Boulder County Authors: Paul Millhouser GIS Analyst Rocky Mountain Wild [email protected] 303-351-1020 Paige Singer Conservation Biologist/GIS Specialist Rocky Mountain Wild [email protected] 303-454-3340 Developed for Boulder County Parks and Open Space Small Grant Research November 29, 2018 Habitat Fragmentation Analysis of Boulder County INTRODUCTION Over the last twenty years, research on the effects of human changes to the landscape has increasingly emphasized the impacts of habitat fragmentation on the continued viability of wildlife populations. Development, in the form of roads, trails and other infrastructure, can have negative effects on habitat suitability and wildlife more generally. Impacts include changes in wildlife behavior and activity due to an increase in human presence; negative effects on species abundance; loss of habitat and spread of invasive species; increased forms of pollution, including noise and light; species’ loss of access to crucial habitat and resources due to road and human avoidance; decreased population viability; increased potential for human-wildlife conflicts; and direct wildlife mortality. See, for example, Benítez-López et al. 2010; Bennett et al. 2011; Gelbard and Belnap 2003; Jaeger et al. 2005; Jones et al. 2015; Mortensen et al. 2009; Trombulak et al. 2000. It is core to Boulder County Parks and Open Space’s (BCPOS) mission and goals to balance resource management and conservation with meeting the needs of the public. Yet, with more and more people coming to Colorado and settling on the Front Range, those in charge of managing our public lands are feeling an ever increasing pressure to accommodate the needs of wildlife while at the same time ensuring satisfactory experiences for the recreating public. -
Predicting Novel Herbivore – Plant Interactions
Oikos 122: 1554–1564, 2013 doi: 10.1111/j.1600-0706.2013.00527.x © 2013 Th e Authors. Oikos © 2013 Nordic Society Oikos Subject Editor: Dries Bonte. Accepted 10 April 2013 Predicting novel herbivore – plant interactions Ian S. Pearse , David J. Harris , Richard Karban and Andrew Sih I. S. Pearse ([email protected]), Cornell Lab of Ornithology, 159 Sapsucker Woods, Ithaca, NY 14850, USA. – D. J. Harris, R. Karban and A. Sih, Center for Population Biology, Univ. of California - Davis, 1 Shields Ave, Davis, CA 95616, USA. ISP and RK also at: Dept of Entomology, Univ. of California - Davis, 1 Shields Ave., Davis, CA 95616, USA. ISP, DJH and AS also at: Dept of Environmental Science and Policy, Univ. of California - Davis, 1 Shields Ave., Davis, CA 95616, USA. As human-aided range expansions and climate change alter the distributions of plants and their herbivores, predicting and addressing novel species interactions will become increasingly pressing for community ecologists. In this context, a key, sur- prisingly understudied question is: when an exotic plant is introduced, which herbivores will adopt this new potential host? Whether the plant is a weed, an ornamental, or a crop, the development versus non-development of a novel plant – insect interaction can have profound eff ects for both economic and conservation applications. In this paper, we sketch mecha- nistic and statistical frameworks for predicting these interactions, based on how plant and herbivore traits as well as shared evolutionary history can infl uence detection, recognition, and digestion of novel plants. By emphasizing mechanisms at each of these steps, we hope to clarify diff erent aspects of novel interactions and why they may or may not occur. -
Extinction Patterns, Δ18 O Trends, and Magnetostratigraphy from a Southern High-Latitude Cretaceous–Paleogene Section: Links with Deccan Volcanism
Palaeogeography, Palaeoclimatology, Palaeoecology 350–352 (2012) 180–188 Contents lists available at SciVerse ScienceDirect Palaeogeography, Palaeoclimatology, Palaeoecology journal homepage: www.elsevier.com/locate/palaeo Extinction patterns, δ18 O trends, and magnetostratigraphy from a southern high-latitude Cretaceous–Paleogene section: Links with Deccan volcanism Thomas S. Tobin a,⁎, Peter D. Ward a, Eric J. Steig a, Eduardo B. Olivero b, Isaac A. Hilburn c, Ross N. Mitchell d, Matthew R. Diamond c, Timothy D. Raub e, Joseph L. Kirschvink c a University of Washington, Earth and Space Sciences, Box 351310, Seattle WA 98195, United States b CADIC-CONICET, Bernardo Houssay, V9410CAB, Ushuaia, Tierra del Fuego, Argentina c California Institute of Technology, Geological and Planetary Sciences, 1200 E. California Blvd. Pasadena CA 91125, United States d Yale University, Geology & Geophysics, 230 Whitney Ave. New Haven, CT 06511, United States e University of St. Andrews, Department of Earth Sciences, St. Andrews KY16 9AL, UK article info abstract Article history: Although abundant evidence now exists for a massive bolide impact coincident with the Cretaceous–Paleogene Received 19 April 2012 (K–Pg) mass extinction event (~65.5 Ma), the relative importance of this impact as an extinction mechanism is Received in revised form 27 May 2012 still the subject of debate. On Seymour Island, Antarctic Peninsula, the López de Bertodano Formation yields one Accepted 8 June 2012 of the most expanded K–Pg boundary sections known. Using a new chronology from magnetostratigraphy, and Available online 10 July 2012 isotopic data from carbonate-secreting macrofauna, we present a high-resolution, high-latitude paleotemperature record spanning this time interval. -
Ecological Cascades Emanating from Earthworm Invasions
502 REVIEWS Side- swiped: ecological cascades emanating from earthworm invasions Lee E Frelich1*, Bernd Blossey2, Erin K Cameron3,4, Andrea Dávalos2,5, Nico Eisenhauer6,7, Timothy Fahey2, Olga Ferlian6,7, Peter M Groffman8,9, Evan Larson10, Scott R Loss11, John C Maerz12, Victoria Nuzzo13, Kyungsoo Yoo14, and Peter B Reich1,15 Non- native, invasive earthworms are altering soils throughout the world. Ecological cascades emanating from these invasions stem from rapid consumption of leaf litter by earthworms. This occurs at a midpoint in the trophic pyramid, unlike the more familiar bottom- up or top- down cascades. These cascades cause fundamental changes (“microcascade effects”) in soil morphol- ogy, bulk density, and nutrient leaching, and a shift to warmer, drier soil surfaces with a loss of leaf litter. In North American temperate and boreal forests, microcascade effects can affect carbon sequestration, disturbance regimes, soil and water quality, forest productivity, plant communities, and wildlife habitat, and can facilitate other invasive species. These broader- scale changes (“macrocascade effects”) are of greater concern to society. Interactions among these fundamental changes and broader-scale effects create “cascade complexes” that interact with climate change and other environmental processes. The diversity of cascade effects, combined with the vast area invaded by earthworms, leads to regionally important changes in ecological functioning. Front Ecol Environ 2019; 17(9): 502–510, doi:10.1002/fee.2099 lthough society usually