DOCSLIB.ORG

BIOS 3010: Ecology Lecture 2: Habitat: Resources • Lecture Summary: – Resources: • Definition • Abiotic • Biotic • Space • Classification – the Niche

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
BIOS 3010: Ecology Lecture 2: Habitat: Resources • Lecture Summary: – Resources: • Definition • Abiotic • Biotic • Space • Classification – the Niche BIOS 3010: Ecology Lecture 2: Habitat: Resources • Lecture summary: – Resources: • Definition • Abiotic • Biotic • Space • Classification – The niche Albrecht Dürer: A Young Hare 1502, The Large Turf 1503 (GSA, Vienna) Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 1 2. Resources and global security: • “The UN predicts that by 2025, two-thirds of us will experience water shortages, with severe lack of water blighting the lives and livelihoods of 1.8 billion. According to the UN World Water Assessment Programme, by 2050, 7 billion people in 60 countries may have to cope with water scarcity.” – Chenoweth, J. 2008. Water, water everywhere. New Scientist 23 August 2008: 28-32. Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 2 3. What is a resource?: • All things consumed by an organism (Tilman, 1982) – But, space is also a resource - therefore: • Resources are quantities that can be reduced by the activity of an organism – Or, in the glossary to Begon et al. (1996) a resource is defined as: • “that which may be consumed by an organism and, as a result, becomes unavailable to another” – e.g. food, water, nesting sites, etc. – Thus CO2, O2, and light can be either resources or conditions - and are more likely to be resources at high population densities and small scales. – Note: like conditions, resources can also act as constraints and cues. Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 3 1 4. Contrast with conditions: • “A condition is an abiotic environmental factor which varies in space and time. Conditions are not consumed or used up by organisms or made less available to others.” – e.g. temperature, moisture or humidity, light, chemistry (e.g. O2, pH, salinity), gravity, pressure, sound, fire, wind, stream or current flow velocity, pollutants. Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 4 5. Abiotic Resources: • Solar radiation is a resource and not a condition when the supply can be influenced by other organisms • Resource supply can vary: – Systematically – Unsystematically • Systematic Variation - e.g. globally, seasonally or diurnally when solar radiation operates more like a condition. – Fig. 3.1, solar radiation with latitude – Fig. 3.3, annual and diurnal variation in solar radiation with latitude – Figs. 3.6 & 3.8 of strategic responses (rigid responses with little tactical maneuverability) to predictable variation in the Photosynthetically Active Radiation spectrum (PAR of 380-710 nm) for plants that vary strategically in abilities to photosynthesize under different light regimes. Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 5 6. Abiotic Resources: • Unsystematic Variation - e.g. local, plastic or tactical responses resulting in resource depletion zones (RDZ): – e.g. the leaves in a forest (Fig. 3.2) or plant roots responding tactically to resource concentration with more root hairs: • e.g. wheat grown in sand + clay - more roots respond to available water and minerals in clay, see Figs. 3.20 & 3.21. – Resource depletion zones vary according to physical characteristics, e.g. nitrates are soluble but phosphates are not - hence mycorrhizae are used by all plants to aid in foraging. • Note: read the text (Begon et al. chapter 3) for accounts of CO2, water, mineral nutrients and O2 as resources Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 6 2 7. Biotic Resources: • The product of autotrophic fixation of energy by plants and used by heterotrophs as consumers. • Produces decomposers, parasites, predators and grazers/herbivores. • Nutritional content of these resources varies: – Fig. 3.23 - nutritional composition of plants versus animals nutritional variation among and within plants: • plants have much higher C:N ratios than animals. – Fig. 3.17 - the complex of herbivores on raspberry plant partition resources in space and time: • considered later under competition. Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 7 8. Space as a resource: • e.g. lizards basking on a rock compete for microsite space to bask. • or monarch butterflies overwintering on trees require space to avoid freezing mortality or mouse predation on the ground. • or testosterone-manipulated red grouse territories in Fig. 3.23 (3rd ed.). Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 8 9. Tilman’s Classification of resources: • after Tilman 1982. • Distinction between essential and substitutable resources to give the 5 sets of performance (growth) isoclines between 2 resources in Fig. 3.27 – Essential – Perfectly substitutable – Complementary – Antagonistic – Inhibitory Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 9 3 10. The ecological niche: • G. Evelyn Hutchinson (1957) defined the niche as an: – “n-dimensional hypervolume” • Ecologically the niche is an abstract concept and not a fixed position in space – (a “neesh” and not a “nitch!” …… Dr. Seuss.) • n-dimensions define the limits within which a species can survive and reproduce, for n environmental “factors” that will include both conditions and resources. Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 10 11. Fundamental & Realized niche: • Fundamental niche: – So the zero growth isoclines of Fig. 3.27 define niche boundaries in 2 dimensions and this can be done for both lower and upper limits of either conditions or resources to define the fundamental niche of a species: • the space that it could occupy - its overall potential. – These niche boundaries can be easily drawn in 1, 2 or 3-dimensions as in Fig. 2.26, for dimensions such as those shown in Fig. 2.2, or dimensions that include resources and ecological processes. But it is difficult to visualize the niche in more dimensions and so the “n-dimensional hypervolume” is the best simple description of niche space. • Realized niche: – The realized niche represents the actual niche dimensions of a species after various ecological processes such as movement, competition and natural enemy attack have reduced the fundamental niche dimensions. Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 11 Fig. 3.1 Global solar radiation absorbed annually (J·cm-2·min-1) Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 12 4 Fig. 3.3 Annual & diurnal variation in solar radiation with latitude Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 13 Fig. 3.6 Photosynthetic CO2 uptake in response to radiation intensity Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 14 Fig. 3.8 • Annual variation in (a) PAR (☐) and leaf photosynthesis (●) and (b) CO2 exchange in the day (¢) and at night (●) Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 15 5 Fig. 3.2 • Reflection (R) and attenuation of solar radiation in: • (a) mixed boreal forest, (b) pine forest, (c) sunflowers, (d) corn field Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 16 Fig. 3.20 • (a) shortgrass prairie plant roots; (b) wheat roots in sand and clay layers Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 17 Fig. 3.21 • Radioautographs of mustard seedlings to show depletion 32 of PO4- in soil Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 18 6 Fig. 3.23 • Composition of different plant and animal resources Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 19 Fig. 3.17 (3rd ed) • Life cycle and phenology of raspberry plant (Rubus idaeus) parts as resources for animal consumers Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 20 Fig. 2.26 (3rd ed. - see Fig 2.2) • Ecological niche in 1 (a), 2 (b) & 3 (c) dimensions Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 21 7 Fig. 2.2 • Various niches in (a) 1 dimension and (b) 2 dimensions Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 22 Niche theory according to Dr. Seuss • And NUH is the letter I use to spell Nutches,! Who live in small caves, known as Nitches, for hutches. These Nutches have troubles, the biggest of which is! The fact there are many more Nutches than Nitches.! Each Nutch in a Nitch knows that some other Nutch! Would like to move into his Nitch very much.! So each Nutch in a Nitch has to watch that small Nitch! Or Nutches who haven’t got Nitches will snitch. – Geisel, T.S. (“Dr. Seuss”) 1955. On beyond Zebra. Random House Publishing, New York. – http://shade.grove.iup.edu/~rgendron/Seuss.htmlx Dr. S. Malcolm BIOS 3010: Ecology Lecture 2: slide 23 8 .
Load more

Recommended publications
  • MS-LS2-1 Ecosystems: Interactions, Energy, and Dynamics
    MS-LS2-1 Ecosystems: Interactions, Energy, and Dynamics Students who demonstrate understanding can: MS-LS2-1. Analyze and interpret data to provide evidence for the effects of resource availability on organisms and populations of organisms in an ecosystem. [Clarification Statement: Emphasis is on cause and effect relationships between resources and growth of individual organisms and the numbers of organisms in ecosystems during periods of abundant and scarce resources.] The performance expectation above was developed using the following elements from the NRC document A Framework for K-12 Science Education: Science and Engineering Disciplinary Core Ideas Crosscutting Concepts Practices LS2.A: Interdependent Relationships Cause and Effect in Ecosystems Analyzing and Interpreting Data Cause and effect relationships Analyzing data in 6–8 builds on K–5 Organisms, and populations of may be used to predict experiences and progresses to organisms, are dependent on their phenomena in natural or designed extending quantitative analysis to environmental interactions both with systems. other living things and with nonliving investigations, distinguishing between correlation and causation, and basic factors. statistical techniques of data and error In any ecosystem, organisms and analysis. populations with similar requirements Analyze and interpret data to for food, water, oxygen, or other provide evidence for phenomena. resources may compete with each other for limited resources, access to which consequently constrains their growth and reproduction. Growth of organisms and population increases are limited by access to resources. Observable features of the student performance by the end of the course: 1 Organizing data a Students organize the given data (e.g., using tables, graphs, and charts) to allow for analysis and interpretation of relationships between resource availability and organisms in an ecosystem, including: i.
    [Show full text]
  • Improving Habitat and Connectivity Model Predictions with Multi-Scale Resource Selection Functions from Two Geographic Areas
    Landscape Ecol (2019) 34:503–519 https://doi.org/10.1007/s10980-019-00788-w (0123456789().,-volV)(0123456789().,-volV) RESEARCH ARTICLE Improving habitat and connectivity model predictions with multi-scale resource selection functions from two geographic areas Ho Yi Wan . Samuel A. Cushman . Joseph L. Ganey Received: 22 May 2018 / Accepted: 18 February 2019 / Published online: 4 March 2019 Ó This is a U.S. government work and its text is not subject to copyright protection in the United States; however, its text may be subject to foreign copyright protection 2019 Abstract converted the models into landscape resistance sur- Context Habitat loss and fragmentation are the most faces and used simulations to model connectivity pressing threats to biodiversity, yet assessing their corridors for the species, and created composite impacts across broad landscapes is challenging. habitat and connectivity models by averaging the Information on habitat suitability is sometimes avail- local and non-local models. able in the form of a resource selection function model Results While the local and the non-local models developed from a different geographical area, but its both performed well, the local model performed best applicability is unknown until tested. in the part of the study area where it was built, but Objectives We used the Mexican spotted owl as a performed worse in areas that are beyond the extent of case study to demonstrate how models developed from the data used to train it. The composite habitat model different geographic areas affect our predictions for improved performances over both models in most habitat suitability, landscape resistance, and connec- cases.
    [Show full text]
  • For-75: an Ecosystem Approach to Natural Resources Management
    FOR-75 An Ecosystems Approach to Natural Resources Management Thomas G. Barnes, Extension Wildlife Specialist ur nation—and especially Kentucky—has an The glade cress Oabundance of renewable natural resources, including timber, wildlife, and water. These re- sources have allowed us to build a strong nation and economy, creating one of the highest stan- dards of living in the world. As our nation grew and prospered during the past 200 years, we ex- tracted those natural resources through agricul- ture, forestry, mining, urban or industrial expansion, and other developments. Ultimately, we affected the amount of wild lands that native plants and animals need for survival. In the past, natural resources agencies have ral- The glade cress grows in Jefferson and Bullitt counties lied public support for declining wildlife popula- and nowhere else in the world. tions. In the 1930s, Congress passed the Federal Aid to Wildlife Resto- Table 1. Selected Ecosystem Declines in the ration Act, also called including the bald eagle, brown pelican, peregrine United States the Pittman-Robertson falcon, and American alligator, have recovered % Decline (loss) or Act, and state wildlife from the brink of extinction. However, numerous Ecosystem or Community Degradation agencies received fund- other species and unique habitats are declining, Pacific Northwest Old Growth Forest 90 ing to restore numerous and the list of endangered and threatened organ- Northeastern Pine Barrens 48 wildlife species that isms continues to grow every year. Why are these Tall Grass Prairie 961 were in trouble, includ- additional species in trouble, while other species Palouse Prairie 98 ing white-tailed deer, are increasing their populations and ranges? Where did we go wrong? Why, almost immedi- Blackbelt Prairies 98 wild turkeys, wood ducks, elk, and prong- ately after passage of the Endangered Species Act, Midwestern Oak Savanna 981 horn antelope.
    [Show full text]
  • Ecological Principles for Resource Planners
    United States Department of National Biology Handbook Agriculture Subpart B—Conservation Planning Natural Resources Conservation Service Part 610 Ecological Principles for Resource Planners (190-VI-NBH, November 2004) Part 610 Ecological Principles for Resource Planners Contents: 610.00 Ecosystems and landscapes 610–1 610.01 Ecosystem processes 610–2 (a) Energy flow ............................................................................................... 610–2 (b) Water and nutrient cycles ........................................................................ 610–3 610.02 Ecosystem structure and its relation to ecosystem function 610–6 610.03 Ecosystem changes and disturbance 610–7 (a) Stability in ecosystems ............................................................................. 610–7 610.04 Biological diversity 610–8 (a) Hierarchy of diversity ............................................................................... 610–8 (b) Species interactions ............................................................................... 610–10 610.05 Applying ecological principles to habitat conservation, 610–11 restoration, and management (a) Area of management actions ................................................................. 610–11 (b) Edge effects ............................................................................................. 610–11 (c) Disturbance effects................................................................................. 610–11 (d) Isolation and distance effects ...............................................................
    [Show full text]
  • Biodiversity Glossary
    BIODIVERSITY GLOSSARY Biodiversity Glossary1 Access and benefit-sharing One of the three objectives of the Convention on Biological Diversity, as set out in its Article 1, is the “fair and equitable sharing of the benefits arising out of the utilization of genetic resources, including by appro- priate access to genetic resources and by appropriate transfer of relevant technologies, taking into account all rights over those resources and to technologies, and by appropriate funding”. The CBD also has several articles (especially Article 15) regarding international aspects of access to genetic resources. Alien species A species occurring in an area outside of its historically known natural range as a result of intentional or accidental dispersal by human activities (also known as an exotic or introduced species). Biodiversity Biodiversity—short for biological diversity—means the diversity of life in all its forms—the diversity of species, of genetic variations within one species, and of ecosystems. The importance of biological diversity to human society is hard to overstate. An estimated 40 per cent of the global economy is based on biologi- cal products and processes. Poor people, especially those living in areas of low agricultural productivity, depend especially heavily on the genetic diversity of the environment. Biodiversity loss From the time when humans first occupied Earth and began to hunt animals, gather food and chop wood, they have had an impact on biodiversity. Over the last two centuries, human population growth, overex- ploitation of natural resources and environmental degradation have resulted in an ever accelerating decline in global biodiversity. Species are diminishing in numbers and becoming extinct, and ecosystems are suf- fering damage and disappearing.
    [Show full text]
  • Biological-Physical Interactions in The
    Chapter 1. INTRODUCTION—BIOLOGICAL–PHYSICAL INTERACTIONS IN THE SEA: EMERGENT FINDINGS AND NEW DIRECTIONS JAMES J. MCCARTHY AND ALLAN R. ROBINSON Harvard University BRIAN J. ROTHSCHILD University of Massachusetts Dartmouth Contents 1. Status and Progress in the Study of Interactive Dynamics 2. Overview of the Book 3. Concluding Remarks References 1. Status and Progress in the Study of Interactive Dynamics The stage is now set for dramatic progress toward a more complete understand- ing of the interactive dynamics among the physical processes that influence biogeo- chemical cycles and population dynamics and the attendant feedbacks in these sys- tems. The 1990s were a period of significant progress toward these goals. Substantial research accomplishments helped to reveal causes of variabilities in the abundances of organisms and their rates of production. Questions rooted primarily in the bio- logical and physical aspects of these interactions were refined, and new observing capabilities employing instrumentation, moorings, and satellite sensing systems were implemented. In the context of climate and global change, some research foci of the past decade were designed to better quantify baseline conditions, as in the case of the carbon cycle. Some intensive field campaigns were sited in regions for which time scales of biological processes from seasonal to multiannual are clearly influenced by physical processes. Some of these campaigns were directed toward regions of the ocean where neither light nor major nutrients seem to limit production, such as the equatorial The Sea, Volume 12, edited by Allan R. Robinson, James J. McCarthy, and Brian J. Rothschild ISBN 0-471-18901-4 2002 John Wiley & Sons, Inc., New York 1 2 JAMES J.
    [Show full text]
  • Nutrition Resource Guide Fr
    Early Childhood Nutrition Resource Guide June 1998 National Center for Education in Maternal and Child Health EARLY CHILDHOOD NUTRITION RESOURCE GUIDE JUNE 1998 NATIONAL CENTER FOR EDUCATION IN MATERNAL AND CHILD HEALTH ARLINGTON,VA Cite as Clark M, Holt K, Sofka D, eds. 1998. Early Childhood Nutrition Resource Guide. Arlington, VA: National Center for Education in Maternal and Child Health. Early Childhood Nutrition Resource Guide is not copyrighted. Readers are free to duplicate and use all or part of the information contained in this publication. In accordance with accepted publishing standards, the National Center for Education in Maternal and Child Health (NCEMCH) requests acknowledgment, in print, of any information reproduced in another publication. The mission of the National Center for Education in Maternal and Child Health is to provide national lead- ership to the maternal and child health community in three key areas—program development, policy analysis and education, and state-of-the-art knowledge—to improve the health and well-being of the nation’s children and families. The Center’s multidisciplinary staff work with a broad range of public and private agencies and organizations to develop and improve programs in response to current needs in maternal and child health, address critical and emergent public policy issues in maternal and child health, and produce and provide access to a rich variety of policy and programmatic information. Established in 1982 at Georgetown University, NCEMCH is part of the Georgetown Public Policy Institute. NCEMCH is funded primarily by the U.S. Department of Health and Human Services through the Health Resources and Services Administration’s Maternal and Child Health Bureau.
    [Show full text]
  • Natural Resource Ecology and Management 1
    Natural Resource Ecology and Management 1 NATURAL RESOURCE Undergraduate Study The Department of Natural Resource Ecology and Management offers ECOLOGY AND MANAGEMENT work for the Bachelor of Science degree with majors in animal ecology (http://catalog.iastate.edu/collegeofagricultureandlifesciences/ The department addresses a broad spectrum of natural resource and animal_ecology/) or forestry (http://catalog.iastate.edu/ environmental issues in a holistic approach to learning, discovery collegeofagricultureandlifesciences/forestry/). The department and engagement. Our vision of natural resources is that informed participates in interdisciplinary programs in biology, environmental protection and management of natural resources involves an integration studies, international studies, and pest management. By proper selection of biological, economic, and social considerations. Such an integrated of free and restricted elective courses, students can obtain a minor or a and comprehensive approach to the education of future generations of second major in these programs or other disciplines. natural resource managers and scientists is needed in order to sustain viable landscapes, facilitate strong communities, and produce desired Contact the department for information about minors from the goods, services, and functions from our natural resources. Department of Natural Resource Ecology and Management. Our educational mission for the undergraduate and graduate programs is The Department provides numerous scholarships; application to provide those
    [Show full text]
  • Resource Selection Function Analyses: Assessing Habitat Use Relative To
    Resource Selection Function Analyses: Assessing habitat use relative to behavior and resource characteristics/availability for five common marine mammal species in the Southern California Bight Trent McDonald1, Mari A. Smultea2,3, Shay Howlin1, and Cathy Bacon2,4 1Western EcoSystems Technology, Inc., Laramie, WY; 2Marine Biology Department, Marine Mammal Behavioral Ecology Group, Texas A&M University at Galveston, Pelican Island, Galveston, TX 77553 3Smultea Environmental Sciences (SES), P.O Box 256, Preston, WA 98050; 4Marine Science Department, Texas A&M University at Galveston, Pelican Island, Galveston, TX 77553 What is an RSF (Resource Selection Function)? Manly et al. 1993, 2002 1. Animals make choices re: resources 2. Resources used disproportionately to availability Models choice using quantifiable habitat characteristics Habitat use & impacts fish, birds, mammals, polar bears • oil / gas exploration • global warming How apply RSF? 1. Randomly select “available” locations & attributes 2. Compare to sighting locations Co-variate (e.g., food abundance) =,xx = How do RSFs differ from density mapping? Density mapping estimates the used distribution only - - Not what’s available. Ignoring availability can bias estimates of preference -- - especially rare habitats Questions & Goals Do marine mammals in U.S. Navy SOCAL Range Complex prefer certain habitat? behave differently in different habitats? GOAL: 1. Establish “baseline” future changes? anthropogenic activities? Approach 15 aerial surveys 2008-2012 Systematic line-transect “First-observed” behavior state Slow = rest, mill, slow travel Travel San Diego U.S. Navy SOCAL Range Training Complex Statistics Standard logistic regression AIC ranking – 127 models Randomly Selected 35,167 points 7 habitat variables 1. Depth 2. Distance to shore 3. Slope 4.
    [Show full text]
  • Community Ecology Review
    But populations and species do not exist in a vacuum… Species interact… Community Ecology A) Five fundamental types of species interactions: Effect on species A B Competition A B Predation A B Mutualism A B Commensalism A B Amensalism A B B) Concept of the Niche 1) Best known definition of niche is Hutchinson (e.g., 1957) a) role organism plays in environment b) role can be determined by measuring all of an organism’s activities and requirements 2) Examples 2-factors 3-factors high Substratum friability low low high Wave exposure 3) By extension… niche defined as an N-dimensional hyperspace (encompasses all effects and requirements of a species) B) Concept of the Niche 3) Two types of niche a) fundamental: niche space determined by environmental factors and resource requirements. Manifest in the absence of other organisms. b) realized: niche space determined by combined abiotic and biotic factors. Realized in presence of other organisms fundamental realized fundamental niche always bigger (or at least as large) - biological interactions can (usually do) limit realized niche C) Competition Defined: The common use of a resource that is in limited supply. 1) Within and between species a) Intraspecific - among individuals of the same species source of density dependence discussed previously b) Interspecific - among individuals of two or more species 2) Two types of competition a) Interference b) Exploitative C) Competition 2) Two types of competition a) Interference - direct competition A B i) e.g., aggression ii) e.g., territoriality (fishes, birds, limpets) b) Exploitation - indirect competition i) Compete through a resource (R) ii) e.g., sessile spp.
    [Show full text]
  • Cuyamaca College Course Outline of Record Biology
    Curriculum Committee Approval: 05/07/19 Lecture Contact Hours: 48-54; Homework Hours: 96-108; Total Student Learning Hours: 144-162 CUYAMACA COLLEGE COURSE OUTLINE OF RECORD BIOLOGY 112 – CONTEMPORARY ISSUES IN ENVIRONMENTAL RESOURCES 3 hours lecture, 3 units Catalog Description Through the scientific study of basic concepts in ecology, students apply their knowledge and scientific reasoning to the study of contemporary problems dealing with renewable and nonrenewable resources. Environmental resource problems involving air, water, energy, human population growth, and plant and animal diversity are examined in context of their scientific, political, economic and social implications. Alternatives for resolving existing problems and preventing future ones will be explored. Prerequisite None Course Content 1) Introduction a. Classification of natural resources b. Sustainability c. Environmental history d. Introduction to the scientific method and its applications in ecology and environmental science e. Risk analysis 2) Basic Principles of Ecology a. What is ecology? What is environmental science? b. Ecological levels of organization of matter in nature c. The Ecosystem: definition, what makes it work? 1. Components of ecosystems 2. Abiotic and biotic components of ecosystems 3. Energy flow in the ecosystem: food chains, food pyramids, food webs 4. Biodiversity and stability of the ecosystem 5. Succession in ecosystems d. Biogeochemical cycles: 1. Carbon, nitrogen, phosphorous and hydrologic cycles 2. Impact of man on these cycles e. Biogeography 1. Terrestrial 2. Aquatic f. Evolution and biodiversity 1. Natural selection 2. Ecological niches 3. Speciation 4. Extinction g. Sustaining wild species 3) Community Ecology a. Community structure 1. Stratification 2. Species diversity b. Roles of species (indicator, native, non-native) c.
    [Show full text]
  • General Nutritional Considerations for IBD Patients Educational Resource for Healthcare Providers
    Fact Sheet General Nutritional Considerations for IBD Patients Educational Resource for Healthcare Providers Malnutrition is common in Inflammatory Bowel Disease (IBD), especially in Crohn’s disease, with rates of 20-85% cited in the literature1. The goals of nutrition therapy are to maintain or restore nutritional balance, manage GI symptoms, and possibly reduce inflammation. A recent study2 from the Crohn’s & Colitis Foundation found that nearly 60% of those with IBD consider nutrition to be a very important part of their IBD management, yet very few are discussing diet with their healthcare providers. This guide is based on current evidence, taking into account important factors such as disease activity, disease location, surgical history, medication use, and bowel function. It is the responsibility of the experienced clinician to provide individualized care based on patient need. 1. Diet: Food avoidance is common in IBD.3 Even though tion status, improve body composition, heal mucosa, patients are commonly instructed to limit fiber or res- decrease pro-inflammatory cytokines, and reduce idue (whole nuts, seeds, raw fruits/vegetables, dairy) serum inflammatory markers, especially in patients and lactose (dairy products) in order to help manage with newly-diagnosed, mild-moderate CD.9,10 It is rec- symptoms, there is limited data to support these rec- ommended that patients on EEN be followed closely ommendations, and a recent study actually showed an in conjunction with a dietitian. association with avoidance of fiber intake amongst pa- • Remission: in general, high fiber diet with as few tients with Crohn’s disease and a greater risk of flares.4,5 restrictions as tolerated.9 In motivated patients, Patients with intestinal stenosis/luminal narrowing or consider Partial Enteral Nutrition or PEN (defined as severe diarrhea may benefit from a low insoluble fiber 30-50% of energy needs provided by PEN) as this has diet (less raw fruits/vegetables, whole grains).
    [Show full text]