Presented Papers Main paper: Elser et al. (2007) „Global analysis of nitrogen and phosphorus limitation of primary producers in freshwater, marine and.

Slides:



Advertisements
Similar presentations
The Effects of Climate Change on Biological Diversity
Advertisements

Community Ecology Definitions: A community is a group of species populations that occur together in the same place and the same time. Community ecology.
Land Carbon Sink and Nitrogen Regulation under Elevated CO 2 : Central Tendency Yiqi Luo University of Oklahoma NCEAS Working group: William Currie, Jeffrey.
Coral reefs lecture outline Session 5: Coral Reefs Coastal Hazards Management Course Basic ecology, global distribution, and structure of coral reefs Seagrass.
Lesson Overview 4.5 Aquatic Ecosystems.
Ch 23: Global Ecology. Ecology Terms Ecology - the study of the interactions of organisms with one another and with the physical environment Biosphere.
Introduction to Meta-Analysis Joseph Stevens, Ph.D., University of Oregon (541) , © Stevens 2006.
Ecology Biomes and Ecosystems. 2 Ecosystems- Matter and Energy.
Trophic Levels & Ecological Pyramids June 9, 2015 Energy Flow in Ecosystems 1.
Reviewing the Literature P9419 Class #4 October 20, 2003.
ECOLOGY Primary Production and Energy Flow How do I become more productive?
Biomes Major varieties of world ecosystems. World Biomes.
CHAPTER 54 ECOSYSTEMS Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Section B: Primary Production in Ecosystems 1.An ecosystem’s.
Trinh Dang Mau Hue college of science. Phylum Rotifera Microscopic aquatic animals Small size: µm Ca species Highly efficient reproduction.
Planetary boundaries Prof. Piotr Kowalik Gdansk University of Technology Poland.
Eutrophication: managing a growing problem in aquatic systems Laurence Mee Professor of Marine and Coastal Policy, Plymouth University.
Ecosystem processes and heterogeneity Landscape Ecology.
Ch Define Ch. 55 Terms: Autotroph Heterotroph Detritivore
Statistical averaging
Open Oceans: Pelagic Ecosystems II
How the decline of ocean species threatens human well-being How the decline of ocean species threatens human well-being Emmett Duffy Virginia Institute.
Chapter 54 Ecosystems. Ecosystem: Overview An ecosystem consists of –All the organisms living in a community – all the abiotic factors with which they.
Ecosystems: Components, Energy Flow, and Matter Cycling Key Components Ecological Structure Basic Components of the Ecosystem Matter Cycles and Energy.
BioEd Online Interdependence of Life: Ecosystems By Deanne Erdmann, MS BioEd Online.
Predicting diversity of large herbivores from moisture and nutrient availability based on the article of Olff et al. (2002): “Global environmental controls.
Effects of Forest Management Practices on Carbon Storage Coeli M. Hoover USDA Forest Service, Northern Research Station Forest PLUS, Washington DC December.
1 Primary Production and Energy Flow Chapter 18 NEVER FORGET!!! ENERGY FLOWS: solar (or nuclear) input heat output NUTRIENTS RECYCLE: mass conservation.
WGE 29th session, September Brit Lisa Skjelkvåle ITEM 4 Acidification and eutrophication ICP Waters ECE/EB.AIR/WG.1/2010/6.
Primary Production in Terrestrial Systems Fundamentals of Ecosystem Ecology Class Cary Institute January 2013 Gary Lovett.
Geographic variations in microbial cytometric diversity
Multiple Stressors. Nutrient loading (nitrogen, phosphorous) or eutrophication UV light (UVB) Contaminants (toxins, sediments) Global warming (increased.
Chapter 52: An Introduction to Ecology and the Biosphere Objectives: - Understand that ecology integrates all areas of biology -Understand interactions.
Grade 9 Science SUSTAINABLE ECOSYSTEMS & HUMAN INTERACTIONS
Unit 5—HS 305 Research Methods in Health Science
An Introduction to Ecology and the Biosphere Chapter 52.
BIOMES OF THE EARTH.
Chapter 4 Ecosystems: Components, Energy Flow, & Matter Cycling © Brooks/Cole Publishing Company / ITP.
In groups define/ discuss the following words Habitat Population Community ecosystem Producers Primary consumers Secondary consumers decomposers Along.
Intro to Ecology. Ecology scientific study of the interactions between organisms and the environment interactions determine distribution of organisms.
ECOSYSTEMS AND ENERGY FLOW CH 55 Energy flows through ecosystems while matter cycles through ecosystems.
ECOSYSTEMS. Energy: How does energy move through the ecosystem, does it cycle or flow? It flows, energy cannot be re-cycled once it is lost as heat. What.
Let’s get started... Levels of Organization Consumers Energy/Matter Flow CyclesBiomes Dip in the MIX $ 200 $ 200$200 $ 200 $ 200 $400 $ 400$400 $
Ecology Study of the relationships between organisms and their environments Study of the relationships between organisms and their environments Their interactions.
Chapter 4 Ecosystems: Components, Energy Flow, & Matter Cycling © Brooks/Cole Publishing Company / ITP.
Relationships within Ecosystems
Chapter 2 Primary Production: The Foundation of Ecosystems © 2013 Elsevier, Inc. All rights reserved. From Fundamentals of Ecosystem Science, Weathers,
ECOSYSTEMS All of the organisms living in a community and the abiotic factors with which they interact. “global ecosystem” Energy flows Nutrients cycle.
1 Ecosystems- Matter and Energy. 2 Primary Production
By C Kohn, Waterford WI.  Define and describe “biodiversity”  Explain how biodiversity is used as a measure of the health of an ecosystem  Connect.
Ecosystem all the organisms living in a community, ___ _______________.
PSY 325 AID Education Expert/psy325aid.com FOR MORE CLASSES VISIT
EEMB 595P Winter 2011 SBC LTER Research Seminar Instructor: S. Holbrook Time :Wednesdays noon-1 pm Room: MSRB auditorium 5-JanOrganizational meeting SBC.
Ecosystems.
CHAPTER 52 An Introduction to Ecology and the Biosphere.
Ecosystems and Biomes ESE I. Biomes A. climatically and geographically defined areas of ecologically similar climatic conditions, organisms, and.
Kelp & Seaweed Ecosystems  Seaweed refers to a diverse group of red, green, & brown algae. All provide the bases for ecosystems among their stipes, holdfasts,
1 Web Search What are coral reefs? How are they formed? 2 Image Search Find a map that shows the areas of the world where coral reefs can be found.
© Cengage Learning 2015 LIVING IN THE ENVIRONMENT, 18e G. TYLER MILLER SCOTT E. SPOOLMAN © Cengage Learning Aquatic Biodiversity.
Ecology Ecology is the study of the interaction between an organism and its environment. These interactions are influenced by biotic (living) and the abiotic.
Why study freshwater? Why not to
Environmental Science Tuesday, October 14, 2008
Ch. 41 Warm-Up Define Ch. 42 Terms:
Chapter 42: Ecosystems and Energy
Ch 52: Intro to Ecology and the Biosphere
Environmental Science Tuesday, October 14, 2008
Ch. 41 Warm-Up Define Ch. 42 Terms:
Biome Vacation.
Chapter 42: Ecosystems and Energy
Chapter 54: Ecosystems.
Chapter 42: Ecosystems and Energy
Presentation transcript:

Presented Papers Main paper: Elser et al. (2007) „Global analysis of nitrogen and phosphorus limitation of primary producers in freshwater, marine and terrestrial ecosystems“ Ecology Letters 10: 1135 – 1142 * Comment: Davidson and Howarth (2007) „Nutrients in Synergy“ Nature 449:

Aim of the study Find out wheter patterns of autotroph nutrient limitation differ across ecosystems (N and P considered). Actual Paradigms:  Marine and terrestrial ecosystems are N limited  Lakes are P limited -> ARE THEY TRUE?

*INSERTION: a) Liebigs Law of the Minimum: Once the demand of N is met, it does not have to be increased further. b) Synergy: The whole is greater than its sum.

Methods: General Meta-Analysis: Field studies about N and P limitation were compiled and analyzed.

Methods: Finding studies Searching Databases (using ISI Web of Science) with a combination of key words AND Using the studies analyzed in recently published syntheses

Methods: Choosing studies Conditions:  Independant manipulations of N and P (less bias)  Mean community level biomass (with few exeptions: no single species) -> MORE THAN THOUSAND STUDIES CHOSEN: (*around 300 publications) 653 freshwater experiments 243 marine experiments 173 terrestrial experiments

Area: Global distribution of study sites for freshwater (yellow), marine (blue), and terrestrial (red) nutrient enrichment experiments.

Methods: Measurements Ln transformed Response Ratio (here biomass): (most frequently used in meta-analyses) ln (Response Ratio) = ln (Effect / Control) Effect = Value of the response variable in the enrichment treatment Contol = Value in the control treatment

Results & Discussion: Comparison of three ecosystems: – No differences in P limitation – N higher limitation in marine ecosystem → coastal P pollution  Paradigms not true

Results & Discussion: Comparison of three ecosystems:  combined N and P strongly increased biomass production in every ecosystem  Synergistic effect

Results & Discussion: Comparison of subhabitats: Every subhatitat with synergistic effects Terrestrial:Soil age: P limitation in tropical forests N limitation in tundras Freshwater: P limitation in lake for algae Marine:N limitationin coral reef for algae and phytoplankton

Results: Confounding effects? (App. S2) Applied nutrient enrichement? -> No significant correlation between applied nutrients and Response Ratio. N / P availability in study site? ->comparable in the studies Duration of experiment ->Did not show a clear tendency

Strength and Weakness of the study ⁺Many studies analyzed, all ecosystems over the world ⁺Many confounding effects considered ⁺Well documented ⁻Doses of N and P addition not addressed*  Carefully done meta-analysis