NSSM 200: Implications of Worldwide Population Growth
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Effects of Human Disturbance on Terrestrial Apex Predators
diversity Review Effects of Human Disturbance on Terrestrial Apex Predators Andrés Ordiz 1,2,* , Malin Aronsson 1,3, Jens Persson 1 , Ole-Gunnar Støen 4, Jon E. Swenson 2 and Jonas Kindberg 4,5 1 Grimsö Wildlife Research Station, Department of Ecology, Swedish University of Agricultural Sciences, SE-730 91 Riddarhyttan, Sweden; [email protected] (M.A.); [email protected] (J.P.) 2 Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Postbox 5003, NO-1432 Ås, Norway; [email protected] 3 Department of Zoology, Stockholm University, SE-10691 Stockholm, Sweden 4 Norwegian Institute for Nature Research, NO-7485 Trondheim, Norway; [email protected] (O.-G.S.); [email protected] (J.K.) 5 Department of Wildlife, Fish, and Environmental Studies, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden * Correspondence: [email protected] Abstract: The effects of human disturbance spread over virtually all ecosystems and ecological communities on Earth. In this review, we focus on the effects of human disturbance on terrestrial apex predators. We summarize their ecological role in nature and how they respond to different sources of human disturbance. Apex predators control their prey and smaller predators numerically and via behavioral changes to avoid predation risk, which in turn can affect lower trophic levels. Crucially, reducing population numbers and triggering behavioral responses are also the effects that human disturbance causes to apex predators, which may in turn influence their ecological role. Some populations continue to be at the brink of extinction, but others are partially recovering former ranges, via natural recolonization and through reintroductions. -
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. -
Understanding Predation
COLLEGE OF AGRICULTURAL, CONSUMER AND ENVIRONMENTAL SCIENCES Understanding Predation Louis C. Bender1 aces.nmsu.edu/pubs • Cooperative Extension Service • Circular 688 The College of Agricultural, Consumer and Environmental Sciences is an engine for economic and community development in New Mexico, improving Figure 1. Predation is a frequently misunderstood ecological process, primarily because people empathize with the prey and confuse the act of predation with the effect of predation on populations of prey. While successful predation re- the lives of New sults in the death of individuals, those deaths may have little or no effect on the population as a whole. (Photo courtesy of L. Bender.) Mexicans through SUMMARY academic, research, Predation is a much misunderstood ecological process. Most people confuse the act of predation with the effect, believing that the killing of an individual and extension animal invariably results in a negative impact on the population (Figure 1). This view is frequently wrong, and ignores the complexity of predation at the individual, population, and community levels. At the individual level, programs. predisposition refers to characteristics (e.g., poor body condition, inadequate cover, disease, etc.) of individuals that make them more or less likely to die from predation or any other cause. Predisposition influences whether (or how likely it was that) an individual would have lived if not killed by a predator. The greater the degree of predisposition, the less likely the death of a pre- dated individual would have any effect on the population. Predisposition is necessary for predation to be compensatory, or substitutive, at the level of the population. -
Restoration of Heterogeneous Disturbance Regimes for the Preservation of Endangered Species Steven D
RESEARCH ARTICLE Restoration of Heterogeneous Disturbance Regimes for the Preservation of Endangered Species Steven D. Warren and Reiner Büttner ABSTRACT Disturbance is a natural component of ecosystems. All species, including threatened and endangered species, evolved in the presence of, and are adapted to natural disturbance regimes that vary in the kind, frequency, severity, and duration of disturbance. We investigated the relationship between the level of visible soil disturbance and the density of four endan- gered plant species on U.S. Army training lands in the German state of Bavaria. Two species, gray hairgrass (Corynephorus canescens) and mudwort (Limosella aquatica), showed marked affinity for or dependency on high levels of recent soil disturbance. The density of fringed gentian (Gentianella ciliata) and shepherd’s cress (Teesdalia nudicaulis) declined with recent disturbance, but appeared to favor older disturbance which could not be quantified by the methods employed in this study. The study illustrates the need to restore and maintain disturbance regimes that are heterogeneous in terms of the intensity of and time since disturbance. Such a restoration strategy has the potential to favor plant species along the entire spectrum of ecological succession, thereby maximizing plant biodiversity and ecosystem stability. Keywords: fringed gentian, gray hairgrass, heterogeneous disturbance hypothesis, mudwort, shepherd’s cress cosystems and the species that create and maintain conditions neces- When the European Commission Einhabit them typically evolve in sary for survival. issued Directive 92/43/EEC (Euro- the presence of quasi-stable distur- The grasslands of northern Europe pean Economic Community 1992) bance regimes which are characterized lie within what would be mostly forest requiring all European Union nations by general patterns of perturbation, in the absence of disturbance. -
Disturbance Processes and Ecosystem Management
Vegetation Management and Protection Research DISTURBANCE PROCESSES AND ECOSYSTEM MANAGEMENT The paper was chartered by the Directors of Forest Fire and Atmospheric Sciences Research, Fire and Aviation Management, Forest Pest Management, and Forest Insect and Disease Research in response to an action item identified in the National Action Plan for Implementing Ecosystem Management (February 24, 1994). The authors are: Robert D. Averill, Group Leader, Forest Health Management, Renewable Resources, USDA Forest Service Region 2, 740 Sims St., Lakewood, CO 80225 Louise Larson, Forest Fuels Management Specialist, USDA Forest Service Sierra National Forest, 1600 Tollhouse Road, Clovis, CA 93612 Jim Saveland, Fire Ecologist, USDA Forest Service Forest Fire & Atmospheric Sciences Research P.O. Box 96090, Washington, DC 20090 Philip Wargo, Principal Plant Pathologist, USDA Forest Service Northeastern Center for Forest Health Research, 51 Mill Pond Road, Hamden, CT 06514 Jerry Williams, Assistant Director, Fire Operations, USDA Forest Service Fire & Aviation Management Staff, P.O. Box 96090, Washington, DC 20090 Melvin Bellinger, retired, made significant contributions. Abstract This paper is intended to broaden awareness and help develop consensus among USDA Forest Service scientists and resource managers about the role and significance of disturbance in ecosystem dynamics and, hence, resource management. To have an effective ecosystem management policy, resource managers and the public must understand the nature of ecological resiliency and stability and the role of natural disturbance on sustainability. Disturbances are common and important in virtually all ecosystems. Executive Summary "Ecosystems are not defined so much by the objects they contain as by the processes that regulate them" -- Christensen and others 1989 Awareness and understanding of disturbance ecology and the role disturbance plays in ecosystem dynamics, and the ability to communicate that information, is essential in understanding ecosystem potentials and the consequences of management choices. -
1 Changing Disturbance Regimes, Ecological Memory, and Forest Resilience 2 3 4 Authors: Jill F
1 Changing disturbance regimes, ecological memory, and forest resilience 2 3 4 Authors: Jill F. Johnstone1*§, Craig D. Allen2, Jerry F. Franklin3, Lee E. Frelich4, Brian J. 5 Harvey5, Philip E. Higuera6, Michelle C. Mack7, Ross K. Meentemeyer8, Margaret R. Metz9, 6 George L. W. Perry10, Tania Schoennagel11, and Monica G. Turner12§ 7 8 Affiliations: 9 1. Department of Biology, University of Saskatchewan, Saskatoon, SK S7N 5E2 Canada 10 2. U.S. Geological Survey, Fort Collins Science Center, Jemez Mountains Field Station, Los 11 Alamos, NM 87544 USA 12 3. College of Forest Resources, University of Washington, Seattle, WA 98195 USA 13 4. Department of Forest Resources, University of Minnesota, St. Paul, MN 55108 USA 14 5. Department of Geography, University of Colorado-Boulder, Boulder, CO 80309 USA 15 6. Department of Ecosystem and Conservation Sciences, University of Montana, Missoula, MT 16 59812 USA 17 7. Center for Ecosystem Science and Society and Department of Biology, Northern Arizona 18 University, Flagstaff, AZ 86011 USA 19 8. Department of Forestry & Environmental Resources, North Carolina State University, 20 Raleigh, NC 27695 USA 21 9. Department of Biology, Lewis and Clark College, Portland, OR 97219 USA 22 10. School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand 23 11. Department of Geography and INSTAAR, University of Colorado-Boulder, Boulder, CO 24 80309 USA 25 12. Department of Zoology, University of Wisconsin-Madison, Madison, WI 53717 26 27 * corresponding author: [email protected]; 28 § co-leaders of this manuscript 29 30 Running title: Changing disturbance and forest resilience 31 1 32 33 Abstract 34 Ecological memory is central to ecosystem response to disturbance. -
Politics in Overpopulation Policies
POLITICS IN OVERPOPULATION POLICIES Politics in Overpopulation Policies Is it justified for a country to implement government policies to control its population? Word Count: 1327 POLITICS IN OVERPOPULATION POLICIES 2 Politics in Overpopulation Policies As civilizations grow, they become increasingly dependent on authorities to guide their daily lives, which becomes an issue with overpopulation. When communication and representation decreases between these groups, politics begin to influence many of the countries' laws and regulations. In China, when overpopulation threatened the stability of the country, the government implemented the one-child policy, which improved the quality of life, but downplayed moral rights. Implementing government policies to control population growth has been a very controversial topic globally, as it is linked to many aspects such as: politics, religion, ethics, etc. Many overpopulated countries participate in implementing policies to control the population growth, but only a handful of them do so publicly due to opposition from much more powerful governments and international organizations. The countries that are against the implementation of policies to control population growth take the stand that it is not justified that such policies lead to political interventions, violate human rights, and potentially destabilize the country in the long run. Implementing government policies to control population growth puts a country at risk of becoming dependent on the policy even after the population stabilizes, which can lead to a shift in the workforce. From 1949 to 1976, the population of China nearly doubled from 560 million to 960 million. According to Rajan, chair professor of the Centre for Development Studies in India and a two decade researcher in foreign affairs, the doubling of the population leveled off the age ratio, causing there to be many more people under the age to work than those of age to support themselves; which in turn caused many socioeconomic and environmental problems to arise (Rajan, 1994). -
Disturbance Versus Restoration
Disturbance and Restoration of Streams P. S. Lake Prelude “One of the penalties of an ecological education is that one lives alone in a world of wounds. Much of the damage inflicted on land is quite invisible to laymen.” Aldo Leopold “Round River. From the Journals of Aldo Leopold” ed., L. B. Leopold. Oxford U.P. 1953. Read: 1963. Lake George Mining Co., 1952, Captains Flat, N.S.W. Molonglo River. Heavy metals (Z+Cu) + AMD. Black (Lake 1963) clear (Norris 1985) ---Sloane & Norris (2002) Aberfoyle Tin NL, 1982. Rossarden, Tasmania. Tin and Tungsten (W). Cd, Zn. South Esk River, 1974 Lake Pedder, south west Tasmania. • Pristine, remote lake with a remarkable, glacial sand beach, endemic fish (Galaxias pedderensis) and ~5 spp., of invertebrates. • Flooded by two dams to produce hydro-electricity in 1973 • Sampled annually for 21 years. • Initial “trophic upsurge” then a steady decline to paucity. Ecological Disturbance • Interest triggered by Connell J.H (1978) Intermediate Disturbance Hypothesis • Disturbances are forces with the potential capability to disrupt populations, communities and ecosystems. Defined by their type, strength, duration and spatial extent---not by their impacts. • Pulse, Press (Bender et al., 1984) and Ramp disturbances (Lake 2000) and responses. Disturbances within Disturbances • Distinct disturbances nested within enveloping disturbances. – Droughts—ramps of water loss, high temperatures, low water quality, loss of connectivity etc. – Climate change with ramps (sea level rise, temperature increase, acidification). Compound Disturbances • Natural e.g. drought and fire – Effect on streams: recovery from catchment-riparian fire impact exacerbated by drought cf., fire alone. (Verkaik et al., 2015). – Sites: Idaho, Catalonia, Victoria, Australia. -
The Effects of Disturbance and Succession on Wildlife Habitat And
This file was created by scanning the printed publication. Errors identified by the software have been corrected; however, some errors may remain. 11 The Effects of Disturbance K EVIN S. McKELVEY and Succession on Wildlife Habitat and Animal Communities his chapter discusses the study of disturbance and al l affect both the postdisturbance wildlife community Tsuccession as they relate to wildlife. As such, the and, more importantly, the trajectory of the postdistur discussion is confined to those disturbance processes bance community. Even for well-studied species, co that change the physical attributes of habitat, leading herent understandings of their relationships to distur to a postdisturbance trajectory. However, even with bance across time and space are therefore often vague. this narrowing of the scope of disturbances discussed, Commonly, we look at successional changes in habi there remain formidable obstacles prior to any co tat quality by using spatial samples of different ages as if herent discussion of disturbance. The first, and most they were a temporal series, which implies spatiotem fundamental, is definitional: what constitutes distur poral constancy in successional dynamics. This assump bance and succession, and what is habitat? The con tion has served wildlife research well, but in the face of cepts of disturbance, habitat, and succession are highly directional climate change and the nearly continuous scale-dependent; disturbances at one scale become addition of exotic species, this approach is becoming part of continuous processes at a larger scale, and ideas increasingly untenable. We need to embrace the idea associated with succession require assumptions of con that postdisturbance succession is increasingly unlikely stancy, which become highly problematic as spatiotem to produce communities similar to those that the dis poral scales increase. -
Carrying Capacity
CarryingCapacity_Sayre.indd Page 54 12/22/11 7:31 PM user-f494 /203/BER00002/Enc82404_disk1of1/933782404/Enc82404_pagefiles Carrying Capacity Carrying capacity has been used to assess the limits of into a single defi nition probably would be “the maximum a wide variety of things, environments, and systems to or optimal amount of a substance or organism (X ) that convey or sustain other things, organisms, or popula- can or should be conveyed or supported by some encom- tions. Four major types of carrying capacity can be dis- passing thing or environment (Y ).” But the extraordinary tinguished; all but one have proved empirically and breadth of the concept so defi ned renders it extremely theoretically fl awed because the embedded assump- vague. As the repetitive use of the word or suggests, car- tions of carrying capacity limit its usefulness to rying capacity can be applied to almost any relationship, bounded, relatively small-scale systems with high at almost any scale; it can be a maximum or an optimum, degrees of human control. a normative or a positive concept, inductively or deduc- tively derived. Better, then, to examine its historical ori- gins and various uses, which can be organized into four he concept of carrying capacity predates and in many principal types: (1) shipping and engineering, beginning T ways prefi gures the concept of sustainability. It has in the 1840s; (2) livestock and game management, begin- been used in a wide variety of disciplines and applica- ning in the 1870s; (3) population biology, beginning in tions, although it is now most strongly associated with the 1950s; and (4) debates about human population and issues of global human population. -
Holocene Subsistence and Settlement Patterns
Archaeology in Washington, Vol. 13, 2007 HOLOCENE SUBISTENCE AND SETTLEMENT PATTERNS: MOUNT RAINIER AND THE MONTANE PACIFIC NORTHWEST Greg C. Burtchard1 ABSTRACT landscapes, to prehistoric people, however, has only recently become widely recognized The last two decades have witnessed in the Pacific Northwest. Perhaps because of increased interest regarding the role of elevation, unpredictable weather and rugged mountain landscapes in regional subsistence terrain, places like Mount Rainier have been and settlement systems, and the manner in regarded by many as marginal to subsistence which those systems changed through time. and settlement strategies that focused instead The 1998 report (revised 2003) Environment, on lowland settings east and west of the Prehistory and Archaeology of Mount Rainier Cascades. National Park, Washington deals with these issues as they apply to Mount Rainier, with The mountain locally known as Takhoma1 was implications for the Cascades generally. This renamed Mount Rainier by George Vancouver paper extracts key arguments from that report, during his Puget Sound explorations (Morgan updated and refined through recent research, 1979:8). It is the highest and most massive of to address long-term land-use processes as the stratovolcanos that form the eastern spine they apply to Mount Rainier and Cascade of the Cascade Range, which extend from Mt. landscapes; and to consider the capacity of Baker in northern Washington to Mt. Lassen the archaeological record to improve our in northern California. For at least the last understanding of these processes. This paper 75,000 years (Harris 1988:240), Rainier has first introduces Mount Rainier’s basic loomed above the surrounding western environmental characteristics, and addresses Cascade peaks, dominating the landscape the capacity of this, and other mountain from the Puget Trough to the Cowlitz River landscapes, to attract and sustain precontact valley on the west, and from the Kittitas to hunters and gatherers. -
Morality and Problems of Overpopulation
MORALITY AND PROBLEMS OF OVERPOPULATION Alarm signals are being hoisted everywhere in the popular press, warning of an imminent onslaught of world overpopulation.1 Even discriminating readers must be wondering how serious the threat is, and what steps ought to be taken. Pressure for compulsory birth control is building up. Catholic opposition appears unreasonable because contrary to the common good.2 This paper will try to establish four points to your satisfaction, 1 The Population Reference Bureau of Washington, D. C., has a number of able writers on its list who issue widely printed news releases, enter articles into such large circulation periodicals as Time, Redbook, The Saturday Eve- ning Post, Newsweek, Nation's Business, Fortune, Look, Scientific American, and others. They follow the alarmist trend. The Planned Parenthood Federa- tion, with headquarters in New York, is quite outspoken in its efforts to popularize birth control and to refute the stand of the Catholic Church. The Reader's Digest of December, 1958, carried a pessimistic article by Julian Huxley; What's New of Abbott Laboratories carried a similar one by Sir Charles Darwin in the late winter issue of 1959; it also presented an opposing view of the present writer in the spring issue; Kingsley Davis follows the alarmist trend in The New York Times Magazine, March 5, 1959; Newsweek featured a short article entitled "The Avalanche of Babies" on April 27, 1959. The tone of newspaper reports tends toward pessimism, and so does that of a spate of books on the reading stand. 2 Many non-Catholic writers have adopted a moderate attitude in their criticism of the Catholic Church's stand: some suggest ways in which the Church could escape gracefully from what they suppose to be a dilemma.