I was going to do a project about chinampas but my team changed the topic. Even though, I made some research and wanted to publish it.
Aztec Food Production System: Chinampas
• Inputs:
o Vegetation
o Mud or Dirt
o Irrigation water
o Organic rich silt
o Household refuse
o Seeds
• Outputs
o Mayor cultigens:
• Maize
• Beans
• Squash
• Chile
• Flows and storage
o Soil retains minerals.
• System characteristics or details
o Is constructed inside a lake.
o Is basically an artificial island.
o High moisture levels prevent frosting.
• Social-cultural concerns
o It isn’t used today since Mexico City’s lakes have been drained.
o It is very labor intensive.
• Environmental impact.
o Requires the draining of swamps.
Amazon Rainforest
domingo, 7 de noviembre de 2010
Notes on Food Supply
o So far, food supply has kept pace with human population growth, however t is doubted that if this trend will continue.
o As we adapt an increasing amount of global NPPP to human needs, use and degrade more land, eat more meat, contaminate more waters, we are getting closer, our planet’s K…we just don’t know what that is yet.
o There are 1.1 billion people living in poverty---they are increasing and growing hungrier.
o Annual grain yields per hectare slowed their rate of increase since the Green Revolution.
o Types of farming systems:
• Subsistence: provision of food for the farmers and their community with little or no surplus.
• Commercial: large profit generating scale; yields are maximized; often are monocultures; with high levels of technology, energy, and chemical inputs.
o As we adapt an increasing amount of global NPPP to human needs, use and degrade more land, eat more meat, contaminate more waters, we are getting closer, our planet’s K…we just don’t know what that is yet.
o There are 1.1 billion people living in poverty---they are increasing and growing hungrier.
o Annual grain yields per hectare slowed their rate of increase since the Green Revolution.
o Types of farming systems:
• Subsistence: provision of food for the farmers and their community with little or no surplus.
• Commercial: large profit generating scale; yields are maximized; often are monocultures; with high levels of technology, energy, and chemical inputs.
MEDC vs. LEDC
Here are some facts on MEDCs and LEDCs:
o In many MEDCs the cost of staple food ítems is relatively cheap.
o Most people make purchases based on taste and preference-
o Produce seasonality and has mostly disappeared due to globalization.
o This has also allowed for a greater international variety in most supermarkets.
o In LEDCs, staple food items may not be always affordable as prices fluctuate.
o People tend to make purchases based on nutritional need and affordability.
o Political and economic agendas can affect food production:
• Cash cropping.
o Even in food crops are not used as cash crops, food production is still impacted since arable land is being occupied all the same.
o In the MEDCs, the average caloric content per capita is 3314 calories in the USA it is 3774.
o In the LEDCs, the average caloric content per capita is 2666 calories. In Eritrea is 1512 calories.
o The American Association for the Advancement of Science suggests that there is an average of 2790 calories available each day for every human on the planet. That is enough to feed everyone.
o If food production has kept up with population growth, why are there still so many problems with famine, hunger and malnutrition?
o Factors to consider
• Distribution – If MEDCs have an excess of food, can that be shipped to LEDCs, but who will pay for it or do they even want that kind of food’
• Politics: If excess food is not paid for, is the receiving country now in the debt of the donating country or worse, the donating corporation? What about corrupt governments altering food distribution?
o In many MEDCs the cost of staple food ítems is relatively cheap.
o Most people make purchases based on taste and preference-
o Produce seasonality and has mostly disappeared due to globalization.
o This has also allowed for a greater international variety in most supermarkets.
o In LEDCs, staple food items may not be always affordable as prices fluctuate.
o People tend to make purchases based on nutritional need and affordability.
o Political and economic agendas can affect food production:
• Cash cropping.
o Even in food crops are not used as cash crops, food production is still impacted since arable land is being occupied all the same.
o In the MEDCs, the average caloric content per capita is 3314 calories in the USA it is 3774.
o In the LEDCs, the average caloric content per capita is 2666 calories. In Eritrea is 1512 calories.
o The American Association for the Advancement of Science suggests that there is an average of 2790 calories available each day for every human on the planet. That is enough to feed everyone.
o If food production has kept up with population growth, why are there still so many problems with famine, hunger and malnutrition?
o Factors to consider
• Distribution – If MEDCs have an excess of food, can that be shipped to LEDCs, but who will pay for it or do they even want that kind of food’
• Politics: If excess food is not paid for, is the receiving country now in the debt of the donating country or worse, the donating corporation? What about corrupt governments altering food distribution?
jueves, 14 de octubre de 2010
Food Production Systems
Food Security
Means that every person in a given area has daily access to enough nutrientes in food to have an active and healthy life.
Under, mal, and overnutrition:
Undernutrition: Not enought food to meet their basic energy needs.
Malnutrition: Occurs when deficiencies in certain nutrients affect a person.
Overnutrition: Energy intakes surprass energy use.
Effects of diet defficiencies:
Vitamin A: Increased susceptability to common infections and can cause blindness.
Iodine: Essencial for hormone processes, causes bad growth.
Iron: Causes anemia due to less iron in hemoglobin.
Famine
It is defined as a severe shortage of food and can be accompanied by mass starvation, deaths, economic chaos, social disruption, maluse of available resources, and cause mass migrations.
Systems of food production:
Croplands - Grain production
Rangelands - Livestock production
Fisheries - Fish production
Types of Agriculture (to be completed later)
Industrialized Agriculture - Large amounts of fossil fuel energy, water, fertilizers, and pesticides to produce single crops and livestock.
Plantation Agriculture - A form of industrialized agriculture used in tropical developping countries and involves growing cash crops such as bananas, soybeans, coffee, cocoa, etc.
Green Revolution
The Green Revolution can be described as the increase of yield per unit of area in a cropland that took part i different occasions in the last century. The lack of water, high costs for small farmers, physical limits such as soil support have limit the expansion of the green revolution.
Means that every person in a given area has daily access to enough nutrientes in food to have an active and healthy life.
Under, mal, and overnutrition:
Undernutrition: Not enought food to meet their basic energy needs.
Malnutrition: Occurs when deficiencies in certain nutrients affect a person.
Overnutrition: Energy intakes surprass energy use.
Effects of diet defficiencies:
Vitamin A: Increased susceptability to common infections and can cause blindness.
Iodine: Essencial for hormone processes, causes bad growth.
Iron: Causes anemia due to less iron in hemoglobin.
Famine
It is defined as a severe shortage of food and can be accompanied by mass starvation, deaths, economic chaos, social disruption, maluse of available resources, and cause mass migrations.
Systems of food production:
Croplands - Grain production
Rangelands - Livestock production
Fisheries - Fish production
Types of Agriculture (to be completed later)
Industrialized Agriculture - Large amounts of fossil fuel energy, water, fertilizers, and pesticides to produce single crops and livestock.
Plantation Agriculture - A form of industrialized agriculture used in tropical developping countries and involves growing cash crops such as bananas, soybeans, coffee, cocoa, etc.
Green Revolution
The Green Revolution can be described as the increase of yield per unit of area in a cropland that took part i different occasions in the last century. The lack of water, high costs for small farmers, physical limits such as soil support have limit the expansion of the green revolution.
miércoles, 6 de octubre de 2010
All The Second Partial...IN BULLETS!!!
EIAs
· They most include a section that identifies the impact.
· Try to predict or to estimate the value or reach of this impact.
· Assess or limit an impact.
History of EIAs
In 1969 National Environment Policy Act adopted by other countries in order to access environmental resources as wealth and with the same importance as economic and other resources.
Economic resources
An economic system produces and distributes goods and services by using natural, human, and manufactured resources, in order to satisfy people’s needs and wants (in the most efficient and effective way) Such as the capitalist and communist systems and the ejidos.
Resources
· Might be known as capital
· Capital used as or to produce goods and services.
· Three types
o Natural capital
§ Includes natural resources that have value and that support life.
· Trees, soil, water, living organism, ores, etc.
· Flood and erosion protection by forests, etc.
§ Natural capital may also be processes.
· Photosynthesis.
· Water and gas cycles.
o Natural capital in economic systems:
§ Capital yields income.
§ Natural capital yields natural income.
§ The World Bank now calculates wealth of countries by including the rate of extraction of natural resources and the ecological damage caused by this.
§ Sustainability often represents sources of conflict within and between political parties and countries.
§ Yield of services.
· Water cycle provides fresh water.
· Photosynthesis provides oxygen.
§ Natural Capital/Natural Income = Resources/Yields
§ Three main categories:
· Renewable: Can replace r restock themselves, have solar energy as it source.
o Water
o Lumber
· Non renewable: Exist in finite amounts on Earth and cannot be replaced after being depleted, also they represent short term solutions.
o Fossil Fuels
o Minerals and metals
· Replenishable: Middle ground between the two above, are replaceable over a long enough period of time that they are not renewable but not enough to be non-renewable. The difference between this and renewable is the rate of resource use and rate of resource replacement.
o Groundwater
· Recyclable resources: Resources that can be transformed into usable materials after already being used form something else. Should only be an option if you don’t longer have that resource.
o Iron
o Aluminum.
§ What is sustainability?
· It means to live between the means of nature, in the sustainable natural income generated by natural capital. Any society that supports itself in part by depleting essential forms of natural capital s unsustainable. Economists and environmentalists may have very different points of view on what is sustainable.
o Human capital:
§ Workforce
o Manufactured capital
§ Machinery
§ Fuels
Chapter 24
· Economic growth: the increase in a nation’s capacity to provide goods and services.
· Economic development: the increase in human development that derive from economic growth.
· Neoclassical economists: believe natural capital as important that not indispensible since we will find a substitute for them. (Friedman and Samuelson) Utilitarianism.
· Ecological economists: they are no substitutes for many natural resources and that economic growth will deplete natural capital and pollution will surpass the environment’s capacity to handle them. They want to redesign our economic and political systems to encourage sustainable forms of economic development. (Costanza and Daly)
· Environmental economists: They agree with ecological economists but believe that we don’t need to redesign the economic systems but rather reform them to have a more sustainable system.
· In my book, sustainability is a condition where people live their lives in an environmentally sound manner and in a state of social justice and environmental integrity just as to no compromise the ability of other human beings to live the same way in the future.
· Sustainable yield can be seen as the increase of natural capital. The natural income that can be exploited each year without depleting the original stick or its potential for replenishment.
o Carrying capacity
o Population size
o Total biomass
o Rates of change of population/biomass/energy
o SY=(total biomass or energy at a given time+1) – (Total biomass or energy at a Time+0)
o SY= Annual growth and recruitment – annual death and emigration.
· Dynamic nature of a resource
o The importance and/or value changes over time
o The availability changes over time
· Resources can be valued in different ways
o Economic =marketable goods
o Ecological=Life support systems
o Scientific=
o Intrinsically=cultural
· The measure of true wealth of a country includes its natural capital.
· In other words, how many resources, forests, rivers it has.
· In general, MEDC’s add value to natural income by manufacturing goods from it.
· LEDC’s may have greater unprocessed natural capital.
· World Bank calculates a country’s wealth by including the rate of extraction of natural resources.
Human Population Dynamics
· Populations can change over time due to many factos
o Density dependent factors: They are modified due to the size of the population
§ Biotic factors
§ Negative feedback mechanisms to regulate and stabilize the population size.
· Internal: act within a species. Ex. Limited food supply and density dependent fertility
· External: act between species, predation and disease.
o Density independent factors: These are present and not modified due to population’s size.
§ Abiotic factors
§ Effects aren’t related to population’s density
§ Acts of God such as weather, climate, volcanic eruptions, floods.
§ Not part of a feedback system.
· Population patterns
o S-curves
§ Start with exponential growth.
§ Then above a certain population size, the growth rate slows down until the size stabilizes.
§ Consistent with density limiting factors.
§ It stabilizes at the carrying capacity of the environment.
§ Area between exponential growth curve and S-curve is called environmental resistance.
§ Phases:
· Lag phase: slowly
· Exponential phase: exponential growth
· Deceleration phase: it slows again
· Stationary phase: stabilization around carrying capacity.
· Overshoot: when after the deceleration phase, the population surpasses the capacity.
· Die-back: when the population decreases to the carrying capacity level.
o J-curves:
§ Shows a boom and bust pattern.
§ Population grows exponentially then crashes.
§ These collapses are called diebacks.
§ Population often exceeds K before the collapse occurs which is referred to as overshoot.
§ Typical of microbes, invertebrates, fish, and small mammals.
· Population strategies:
o K-Strategies:
§ Long lifespan
o R-strategists:
§ Short lifespan
· Population Changes
o Main factors
§ Birth Rate
§ Death Rate
§ Immigration
§ Emigration
o Measures of population change
§ Crude birth rate: Number of births per 1000 individuals. Dividing the number of births by population size
§ Crude death rate: doesn’t includes anything else but # of dead and # of births. Number of deaths per 1000 individuals. Dividing the number of deaths by population size.
§ Doubling rate: How fast a particular population doubles its amount. Doubling time=70/NIR
§ Natural Increase rate: NIR=(CBR-CDR)/10. Doesn’t considers immigration/emigration.
§ Total fertility rate: the average number of children that each woman has over her lifetime, it shows the potential for population change.
· TFR=2.0 population is stable.
· TFR < 2.0 population decrease.
· TFR >2.0 population increase
· Human population:
o The industrial revolution and the appearance of some medicines changed the human population curves.
o Human development index: measure of the “well-being” of a country. It combines measurements of life expectancy, standards of living, education, and GDP per capita into one index.
o MEDCs
§ Industrialized nations with high GDPs, they have relatively rich population and starvation is unlikely. High level of resource use per capita. Relatively low population growth rates.
o LEDCs
§ are less industrialized, plenty of natural capital, lower GDP and high property rates, large population sector and high population growth rate.
o Population size is not the only factor that determines our species’ impact.
§ Amount of wealth and distribution.
§ Resources desire
§ Resource need
o Population Growth and Food Shortages:
§ Thomas Malthus: clergyman and economists he wrote a theory of competition of resources that influenced Charles Darwin and many others.
·
· That the power of population is indefinitely greater than the power in the earth to produce subsistence for man.
· Population growth will outpace agricultural production.
· According to Malthus, disease, food shortage and death due to starvation, were nature's way to control population.
· He thinks the control of birth will prevent these problems.
· It assumes population grows exponentially and agricultural production grows in a linear manner.
· It doesn’t recognizes human capacity to increase food supply.
§ Ester Boserup: was a Danish economist and writer who worked for the UN, she wrote about population growth and agricultural development from a technocentric perspective.
· Humans will create technology to increase the food supply and create a sustainable society.
· Necessity is the mother of invention.
o Future World Population
§ If the fertility rate is 2.0, the population will stabilize a bit and rise to 10.8 billion by 2050.
§ If every second woman has 3 instead of 2 children, population will rise to 27 billion by 2150. However if instead every second woman has just 1 child, then population will drop to 3.6 billion.
§ Currently TFR is about 3.0
o Why Have So Many Kids?
§ Does not seem to be correlated with GNP nor personal wealth.
· High mortality rates for infants and youth.
· Security in old age.
· Children are an economic asset in agricultural societies.
· Status of women
o Only considered worthy only for making children and their social status depends on the number, especially boys.
o Education has allowed women to gain status outside of the context of mere baby factories and has contributed toward low fertility rates of MEDC’s.
o Unavailability of contraception: All measures that avoid or suspend pregnancy.
§ Reduce birth rate:
· Promote alternative “family models”, adoption, etc.
· Provide Education
· Make contraception available.
· Improve health availability.
· Standards of living.
· Nutrition
· Better economic conditions
· Resources distribution
Many environmental impact models are based on the assumption that all individuals in a population have the same resource use and waste profile and thus impact the environment equally
miércoles, 22 de septiembre de 2010
Sustainable Yield in Trinidad's Rainforest
In the year 2003, the American Society of Civil Engineers gave the results of an investigation regarding the sustainable yield of the ancient tropical forest area in the island of Trinidad in Trindad & Tobago.
The results said that while the area has an enormous potential for ecotourism, the underground water resources are very low which affects its carrying capacity touristic activities. They needed to know how to estimate the sustainable yield of the water resources in the area.
A hydrologic similarity method, which is a model of storm runoff production (the water that gets to the underground after it rains) was used to obtain substainable yield of the ungauged rivers. Further, the instream flow was estimated, in the absence of any local criterion, by instream flow incremental methodology.
Bibliography:
Shrivastava, Gyan S. Estimation of Sustainable Yield of Some Rivers in Trinidad. ASCE. Feb 2003. 22 Sep 2010. http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JHYEFF000008000001000035000001&idtype=cvips&gifs=yes&ref=no
The results said that while the area has an enormous potential for ecotourism, the underground water resources are very low which affects its carrying capacity touristic activities. They needed to know how to estimate the sustainable yield of the water resources in the area.
A hydrologic similarity method, which is a model of storm runoff production (the water that gets to the underground after it rains) was used to obtain substainable yield of the ungauged rivers. Further, the instream flow was estimated, in the absence of any local criterion, by instream flow incremental methodology.
Bibliography:
Shrivastava, Gyan S. Estimation of Sustainable Yield of Some Rivers in Trinidad. ASCE. Feb 2003. 22 Sep 2010. http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JHYEFF000008000001000035000001&idtype=cvips&gifs=yes&ref=no
My Footprint
Hi guys,
I present you with my foodprint tests results.
It seems I need the resources of 2.35 planets to live!
Leave comments to help me reduce this.
I present you with my foodprint tests results.
Leave comments to help me reduce this.
jueves, 26 de agosto de 2010
On...tropical rainforest biomass per trophic level (an estimate)
Bibliography:
Oliver L. Phillips, Niro Higuchi, Simone Vieira, Timothy R. Baker, Kuo-Jung Chao, and Simon L. Lewis. "Changes in Amazonian Forest Biomass, Dynamics, and Composition, 1980–2002." 2009.
Sandhyarani, Ningthoujam. "Tropical Rainforest's Energy Pyramid." 2010. Buzzle.com. 24 August 2010 <http://www.buzzle.com/articles/tropical-rainforests-energy-pyramid.html>.
martes, 24 de agosto de 2010
On...biomass estimation
Methods for estimating biomass at different trophic levels:
1. Producers
• Estimating biomass with satellite imagery: The Canadian Forest service has developed a method for estimating the biomass of black spruces using high-resolution imagery instead of aerial photos. This method uses the shadows portrayed by trees to estimate the total biomass per hectare.
• A probable problem that might arise from this method is that it only works with very tall tree specimens (over 20 meters in height) and might not take into account smaller individuals also; it might confuse different tree species and give wrong data at the end. But, it might help after further tuning, in the estimation of biomass in boreal areas where no species inventory is available.
• Estimating biomass density based on existing volume data: This method uses pre-existing data from a certain forest area to make an estimate of the aboveground biomass density of the place. After the information is recollected, it is substituted in a formula.
o Many limitations arise from this method. First of all, the totality of the trees in the area need to be taken in account in the existing data for it to be valuable and the records need to be recent. Since most of the forest inventories only take into account commercial tree species, the validity of the biomass given can be refuted. But, these estimations provide a quick way of doing these calculations especially if those doing the investigation lack enough capital to do a thorough investigation.
2. Consumers
• Estimate of worldwide fish biomass using two approaches: Two scientists from the University of British Columbia have examined global ocean plant production and its efficiency as it moves through the food chain, and at the same time tallied global fish catches since 1950 and calculated how much fish there must have been in the oceans to support fisheries. This has let to a fish biomass range from 0.8 to 2.0 billon tons.
o Each method has a series of problems. The second method uses commercial information that might or might not be factual. Also it uses the speculation that there are only enough fishes to support fisheries while there can be more.
Bibliography:
1. Producers
• Estimating biomass with satellite imagery: The Canadian Forest service has developed a method for estimating the biomass of black spruces using high-resolution imagery instead of aerial photos. This method uses the shadows portrayed by trees to estimate the total biomass per hectare.
• A probable problem that might arise from this method is that it only works with very tall tree specimens (over 20 meters in height) and might not take into account smaller individuals also; it might confuse different tree species and give wrong data at the end. But, it might help after further tuning, in the estimation of biomass in boreal areas where no species inventory is available.
• Estimating biomass density based on existing volume data: This method uses pre-existing data from a certain forest area to make an estimate of the aboveground biomass density of the place. After the information is recollected, it is substituted in a formula.
o Many limitations arise from this method. First of all, the totality of the trees in the area need to be taken in account in the existing data for it to be valuable and the records need to be recent. Since most of the forest inventories only take into account commercial tree species, the validity of the biomass given can be refuted. But, these estimations provide a quick way of doing these calculations especially if those doing the investigation lack enough capital to do a thorough investigation.
2. Consumers
• Estimate of worldwide fish biomass using two approaches: Two scientists from the University of British Columbia have examined global ocean plant production and its efficiency as it moves through the food chain, and at the same time tallied global fish catches since 1950 and calculated how much fish there must have been in the oceans to support fisheries. This has let to a fish biomass range from 0.8 to 2.0 billon tons.
o Each method has a series of problems. The second method uses commercial information that might or might not be factual. Also it uses the speculation that there are only enough fishes to support fisheries while there can be more.
Bibliography:
- Beaudoin, André. "Estimating biomass with satellite imagery." 29 January 2009. Natural Resources Canada. 24 August 2010.
- Brown, Sandra. "Estimating Biomass and Biomass Change of Tropical Forests: a Prime." 1997. FAO. 24 August 2010 <http://www.fao.org/docrep/w4095e/w4095e00.htm>.
- University of British Columbia. "Researcher gives first-ever estimate of worldwide fish biomass and impact on climate change." 19 January 2009. Physorg. 24 August 2010 <http://www.physorg.com/news151251277.html>.
lunes, 23 de agosto de 2010
On...biomass and its calculation
Biomass is the is the total mass of living matter per unit area. Its calculation helps us understand how an ecosystem or an specific species has changed over a period of time and can help us determine the health and evolution of the specimen.
Biomass of an organism can be calculated using the formula
Berg, Susan. "How Is Biomass Calculated?." eHow. N.p., 14 Oct 2009. Web. 23 Aug 2010.
Biomass of an organism can be calculated using the formula
- Biomass = # of organisms * average mass of the organism,
- biomass(net) = increase biomass(gross) -- decrease biomass(gross).
Berg, Susan. "How Is Biomass Calculated?." eHow. N.p., 14 Oct 2009. Web. 23 Aug 2010.
jueves, 19 de agosto de 2010
Biodiversity Indexes
While biodiversity stands for the variety of life in the world or in a particular habitat or ecosystem, biodiversity indexes are the numerical representation of the biodiversity of an ecosystem.There are various different types of indexes but here are some of the most common ones:
"Biodiversity indices." Virtue School Project. N.p., 17 Nov 2009. Web. 19 Aug 2010.
- Species richness (S) is the total number of subspecies found in an environment/sample per species.
- Simpson's index (D) is the probability that two randomly selected individuals belong to two different species/categories. It assumes that the proportion of individuals in a area indicate their importance of diversity.
- Shannon-Wiener index (H) is measuring the order/disorder in a particular system. This order is characterized by the number of individuals found for each species/category in the sample. A high species diversity may indicate a healthy environment.
"Biodiversity indices." Virtue School Project. N.p., 17 Nov 2009. Web. 19 Aug 2010.
jueves, 12 de agosto de 2010
On...the identification and classification of living things
First of all, let's define what a living thing is, it is an organism that has these characteristics:
1. They have cell(s).
2. They reproduce
3. Grow and develop.
4. Use energy and matter.
5. Maintain homeostasis.
6. Respond to stimuli.
7. They are organized (tissues, membranes).
Even though, there exists a special kind of microorganism that doesn't has all of the characteristics but pose a threat to this definition of a living thing: VIRUSES.
There are various ways of classifying all of the living things, in order:
Bibliography:
1. They have cell(s).
2. They reproduce
3. Grow and develop.
4. Use energy and matter.
5. Maintain homeostasis.
6. Respond to stimuli.
7. They are organized (tissues, membranes).
Even though, there exists a special kind of microorganism that doesn't has all of the characteristics but pose a threat to this definition of a living thing: VIRUSES.
There are various ways of classifying all of the living things, in order:
- Kingdom
- Phylia
- Class
- Order
- Family
- Genus
- Species: A group of organisms with similar physical traits that can reproduce and produce fertile offspring.
Bibliography:
- "Classifying Living Organisms." York Science. N.p., 2010. Web. 12 Aug 2010. <http://yorksci.wikispaces.com/Classifying+Living+Organisms>.
- Rice, George. "Are Viruses Alive? ." Microbial Life. N.p., 2010. Web. 12 Aug 2010. <http://serc.carleton.edu/microbelife/yellowstone/viruslive.html>.
martes, 10 de agosto de 2010
Some basic ESS info:
- What is a system:
A set of components that act on a theoretically predictable manner. It has inputs and outputs. - Examples of ecosystems:
Tundra, taiga, tropical rainforest, decidious rainforest, coniferous rainforest, chaparral, savanna, and desert. - Describe what are trophic levels:
Trophic levels are the hierarchical level that a species occupies in the ecosystem.
Ex.
Grass (Producer) - Mice (1st consumer) - Bacteria (Decomposer) - Write about a particular ecosystem including mass and energy flows:
In a grassland for example, energy is first produced by the grasses and herbs that inhabit the region. These are then eaten by mice, grasshoppers, and other small predators that are called primary consumers. These consumers are then eaten by secondary consumers as birds which are then eaten by teartiary consumers such as eagles and owls. In between each consuption, some energy is lost as heat and we must also count out that energy disposed as waste.
Introduction
Hi, my name is Miguel Angel Gutiérrez Guerrero I'm an IB student from Monterrey, Mexico and I've open this blog for my Environmental System and Socities course. I'll be using this site as an evidence on all the topics for this IB subject.
Suscribirse a:
Entradas (Atom)