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SCIENCE TEACHERS WORKSHOP Community-Based Science Program Funded by KY Improving Educator Quality Program |
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Fall 2007 - Spring 2008 |
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THE
CRAYFISH PROJECT
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People involved: |
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Movies of crayfish: (Go To) | |||||||||
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CRAYFISH PROJECTS >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Potential
experiments that can be conducted in classrooms. 1.
Crayfish social behaviors. Score interactions: fights, submissive , bluffs
etc.. (Download as a MS word or a PDF)
Overall
projects that can be examined as a class project: PROJECT 1: Increased levels of atmospheric CO2 on crayfish Overall Objective -monitor behavioral and physiological responses due to current environmental issues with a simple model organism of KY (i.e., crayfish). Monitor behaviors, heart rate, ventilation rate, responses to environmental cues, and selective pressure in crayfish within this experimental inquiry based module.
1. Carbon Dioxide Concentrations in the Atmosphere (Facts for students- could ask them how to measure this over years then present the ice core data)
Concentrations of carbon dioxide measured in the air bubbles trapped in the ice are shown in Antarctic ice core from Law Dome near Australia's Casey Station. Concentration of Carbon Dioxide from trapped air measurements for the DE08 ice core near the summit of Law Dome, Antarctica. (Data measured by CSIRO Division of Atmospheric Research from ice cores supplied by Australian Antarctic Division). Dr. T.H. Jacka, Glaciology Program,Antarctic Cooperative Research Centre and Australian Antarctic Division. QUES. a: Explain what is significant about the change in carbon dioxide concentration with time as viewed in the graphic? QUES. b: What energy consuming and carbon dioxide producing events were taking place in most of the Northern Hemisphere at the time, (1850, 1900 and years following), of the dramatic increase in the carbon dioxide concentration? (ref http://www.elmhurst.edu/~chm/vchembook/globalwarmA3.html)
2. What contributes to CO2 rising in the atmosphere? (Inquiry based time) What
Are Greenhouse Gases? Many gases exhibit these "greenhouse" properties. Some of them occur in nature (water vapor, carbon dioxide, methane, and nitrous oxide), while others are exclusively human-made (like gases used for aerosols). Levels of several important greenhouse gases have increased by about 25 percent since large-scale industrialization began around 150 years ago (Figure 1). During the past 20 years, about three-quarters of human-made carbon dioxide emissions were from burning fossil fuels. Figure
1. Trends in Atmospheric Concentrations and Anthropogenic Emissions of
Carbon Dioxide Concentrations of carbon dioxide in the atmosphere are naturally regulated by numerous processes collectively known as the "carbon cycle" (Figure 2). The movement ("flux") of carbon between the atmosphere and the land and oceans is dominated by natural processes, such as plant photosynthesis. While these natural processes can absorb some of the net 6.1 billion metric tons of anthropogenic carbon dioxide emissions produced each year (measured in carbon equivalent terms), an estimated 3.2 billion metric tons is added to the atmosphere annually. The Earth's positive imbalance between emissions and absorption results in the continuing growth in greenhouse gases in the atmosphere. Figure
2. Global Carbon Cycle (Billion Metric Tons Carbon) What Effect Do Greenhouse Gases Have on Climate Change? Given the natural variability of the Earth's climate, it is difficult to determine the extent of change that humans cause. In computer-based models, rising concentrations of greenhouse gases generally produce an increase in the average temperature of the Earth. Rising temperatures may, in turn, produce changes in weather, sea levels, and land use patterns, commonly referred to as "climate change." Assessments generally suggest that the Earth's climate has warmed over the past century and that human activity affecting the atmosphere is likely an important driving factor. A National Research Council study dated May 2001 stated, "Greenhouse gases are accumulating in Earth's atmosphere as a result of human activities, causing surface air temperatures and sub-surface ocean temperatures to rise. Temperatures are, in fact, rising. The changes observed over the last several decades are likely mostly due to human activities, but we cannot rule out that some significant part of these changes is also a reflection of natural variability." However, there is uncertainty in how the climate system varies naturally and reacts to emissions of greenhouse gases. Making progress in reducing uncertainties in projections of future climate will require better awareness and understanding of the buildup of greenhouse gases in the atmosphere and the behavior of the climate system.
In the U.S., our greenhouse gas emissions come mostly from energy use. These are driven largely by economic growth, fuel used for electricity generation, and weather patterns affecting heating and cooling needs. Energy-related carbon dioxide emissions, resulting from petroleum and natural gas, represent 82 percent of total U.S. human-made greenhouse gas emissions (Figure 3). The connection between energy use and carbon dioxide emissions is explored in the box on the reverse side (Figure 4). Figure
3. U.S. Anthropogenic Greenhouse Gas Emissions by Gas, 2001
Figure
4. U.S. Primary Energy Consumption and Carbon Dioxide Emissions, 2001 Another greenhouse gas, methane, comes from landfills, coal mines, oil and gas operations, and agriculture; it represents 9 percent of total emissions. Nitrous oxide (5 percent of total emissions), meanwhile, is emitted from burning fossil fuels and through the use of certain fertilizers and industrial processes. Human-made gases (2 percent of total emissions) are released as byproducts of industrial processes and through leakage. What Is the Prospect for Future Emissions? World carbon dioxide emissions are expected to increase by 1.9 percent annually between 2001 and 2025 (Figure 5). Much of the increase in these emissions is expected to occur in the developing world where emerging economies, such as China and India, fuel economic development with fossil energy. Developing countries' emissions are expected to grow above the world average at 2.7 percent annually between 2001 and 2025; and surpass emissions of industrialized countries near 2018. Figure
5. World Carbon Dioxide Emissions by Region, 2001-2025 Figure
5 is a line graph showing world carbon dioxide emissions by region from
2001-2025. Figure
6. Carbon Intensity by Region, 2001-2025
3. What kind of impact would this have on animals ? Lets use a model animal in KY, say a crayfish. Higher level of CO2 in air would also impact the KY streams. High limestone (CaHCO3) is similar to the ocean with HCO3 serving as a buffer balance. This could also change pH (acidly levels) of the water and have a direct pH effect of crayfish. Other factors which could effect CO2 levels in water ? (Inquiry based- could be tested in classroom) Lot of detritus decaying in the stream or in stagnate water will produce CO2 and layers within the water (or layers of mud) in which crayfish live. Recall crayfish burrow in mud banks as well as within the pond or stream. Air contains only 0.035 % carbon dioxide by volume; however, CO2 is nearly 30 times as soluble in water as oxygen. Carbon dioxide moves across the air-water interface according to the same physical process that affect the dissolving of oxygen. Both temperature and pressure affect the diffusion rate measured by dissolved CO2 instruments. Accuracy and diffusion range are typically measured in parts per thousand or parts per million. (http://sensors-transducers.globalspec.com/Industrial-Directory/co2_detector) Carbon dioxide (CO2) is present in water as a dissolved gas, like oxygen. High CO2 can stress and even kill fish. It also forms carbonic acid, which lowers the pH. this can be tested with Carbon Dioxide Test Kit. LaMotte Limnological Water Test Outfit. (http://www.lamotte.com/pages/edu/ind-kits/carbdiox.html) Testing takes 2 minutes. 0 to 50 mg/liter.
Field
studies Lab
studies
(b) For grouped crayfish: Examine social interactions. Fighting, dominate and submissive behaviors. Now in these lab held crayfish one can experiment with them and study the effects of dissolved CO2 in the water. What
happened if there is a rapid change as compared to a gradual change ?
Drastic effects can be induced by adding HCO3 (baking soda) or Alka-Seltzer
tablets (more than just CO2) and more gradual changes can be induced by
adding small amounts of baking soda over a period of days or weeks. See crayfish exposed to CO2 while monitoring pH-- movie
IV. LEARNING OBJECTIVES (KY CORE CONTENT) If monitor Heart rate: (1) To highlight various types of experiments that students could design on their own for experimental inquiry. (AP Biology- "Science as a Process", NSES- "Science Inquiry") (2) To convey an understanding in the regulation of heart rate and highlight similarities and differences between vertebrates and invertebrates. (AP Biology- "Unity in Diversity"). (3)
To allow students to ask further questions based on experiences with invertebrate
models and to develop experimental designs for further research. (AP Biology-"Science
as a Process"). If measuring Physiology/Behaviors (Core Content Connections- need to check with David Helm FCPS): SC-06-3.4.1 SC-06-3.5.2 SC-08-4.6.5 I. INTRODUCTION FOR CLASSROOM PROJECTS "Persistent
suds were once commonly found in lakes and streams whose run-off contained
phosphate-based detergents. Phosphorus is a limiting factor in lakes.
Botkin and Keller (1998) define a limiting factor as the single requirement
in the least supply in comparison to the need of an organism. If this
factor becomes abundant, excess growth of an organism, or group of organisms,
that require that factor will occur. If the organism is an alga, we call
this excess growth an algal bloom. Algal blooms are often caused by a
phenomenon called cultural eutrophication. This is described as the over
nourishment (or increase in a limiting factor or nutrient) of aquatic
ecosystems with plant nutrients because of human activities (Miller, 2000).
"The
nutrient cycle for a natural pond, lake, or slow moving river starts with
the plants (either simple, one-celled algae to more advance multi-celled
flowering plants such as eel grass) and their ability to photosynthesize.
This process uses carbon dioxide (CO2) and water (H2O) with energy from
sunlight to form sugar (C6H12O6) and oxygen gas (O2). During photosynthesis
oxygen dissolves in the water and is then available to aquatic plants,
animals, and bacteria that all require it for respiration. Respiration
is the opposite chemical reaction, where plants and animals take in oxygen
and break down sugar to get energy for life and release water and carbon
dioxide. "The
water quality of a river is only as good as the quality of the watershed
that feeds into it. The properties of the water itself can be altered
by very small amounts of added materials. Surface water, especially, are
easily changed. There can be silt brought in by flooding, algae blooms
caused by the combination of an increase nutrient supply and sunlight,
or the leaching of minerals from soil or decomposing forest litter. And from the Southwest Florida Water Management District, Brian Nelson gives a lesson in aquatic life: "Free-floating (planktonic) and attached (periphytic) algae species are common and very important components of both freshwater and marine habitats. Algae, along with plants, are primary producers. They are able to utilize sunlight to make food (photosynthesis) and are the basis of the food chain for all aquatic organisms from zooplankton to shrimp and crayfish to largemouth bass and sea trout. "Water bodies are often classified based on their productivity or ability to grow aquatic plants and/or algae, which is based on the amount of nutrients nitrogen and phosphorus (fertilizer) in the water. Oligitrophic lakes have few nutrients. They are characterized by small amounts of plants and algae, clear water, and little sedimentation or muck on the bottom. Eutrophic lakes are characterized by high levels of nutrients, abundant plant and/or algae populations, green water, and lots of sediment or muck on the bottom. "As lakes age, they become more eutrophic as nutrients from their watershed are washed into the lake. This is a natural process that takes place over thousands of years. However, the process can be greatly accelerated by storm water runoff, the discharge of sewage, excessive use of fertilizer and other man-induced alterations within their watersheds. This process is called cultural eutrophication. This process can also affect estuarine areas such as Tampa Bay. "Excessive algal populations that are common on eutrophic waters are considered detrimental for numerous reasons. They reduce water clarity, shading out more beneficial submerged plants that provide necessary food and habitat for fish, waterfowl, manatees and other aquatic life. In extreme cases, excessive algal populations can reduce dissolved oxygen levels in the water to a point where fish kills occur. These occurrences where algae becomes super-abundant are often referred to as algae blooms. "Cultural eutrophication has impacted many freshwater and estuarine waters within our district and throughout Florida. For this reason, the water management districts, the Florida Department of Environmental Protection and other agencies have enacted educational, regulatory, restoration and protection programs to restore and protect water quality." So it's a possibility that algal blooms could be a problem and affect the fish you're after, but there haven't been many documented cases of people getting sick from this. Last year, the Centers for Disease Control issued this statement: "PEAS [possible estuary-associated syndrome] is not infectious and has not been associated with eating fish or shellfish caught in waters where pfiesteria has been found. However, persons should avoid areas with large numbers of diseased, dying, or dead fish and should promptly report the event to the state's environmental or natural resource agency." PEAS symptoms include headache, skin rash, sensation of burning skin, eye irritation, upper respiratory irritation, muscle cramps, and gastrointestinal symptoms, the CDC said. (ref http://www.ecofloridamag.com/askeditor_algal_bloom.htm)
II. METHODS Field
studies Lab
studies (b) For grouped crayfish: Examine social interactions. Fighting, dominate and submissive behaviors.
Now in these lab held crayfish one can experiment with them and study
the effects of an induced algae bloom. Use growth lights and algae. Also
can add rich food sources such as fish food. O2
& algae measure: III. ANTICIPATED RESULTS/ DATA PROCESSING Have
students list out possible outcome ahead of time. Have them make postulations
and after initial studies are done then hypothesis based on the outcomes
of the earlier tested predictions.
Can graph data in Excel like this (note see 1-3 pages on file) (Excel file) IV. LEARNING OBJECTIVES (KY CORE CONTENT) If monitor Heart rate: (1) To highlight various types of experiments that students could design on their own for experimental inquiry. (AP Biology- "Science as a Process", NSES- "Science Inquiry") (2) To convey an understanding in the regulation of heart rate and highlight similarities and differences between vertebrates and invertebrates. (AP Biology- "Unity in Diversity"). (3)
To allow students to ask further questions based on experiences with invertebrate
models and to develop experimental designs for further research. (AP Biology-"Science
as a Process"). If measuring Physiology/Behaviors (Core Content Connections- need to check with David Helm FCPS): SC-06-3.4.1 SC-06-3.5.2 SC-08-4.6.5 REFERENCES CITED (more to add) Bodkin, Daniel B. and Edward A. Keller. 1998. Environmental Science: Earth As A Living Planet. 2nd ed. New York: John Wiley & Sons, Inc. Michigan Department of Education. Michigan Curriculum Framework. [Online]Available http://cdp.mde.state.mi.us/MCF/search.html. Wednesday, August 8, 2001 Kellie, S., Greer, J. and Cooper, R.L. (2001) Alterations in habituation of the tail flip response in epigean and troglobitic crayfish. Journal of Experimental Zoology 290:163-176. [Full Text.pdf]. (Kellie and Greer were undergraduates in my laboratory at UK) Li, H., Listerman, L., Doshi, D., and Cooper, R.L. (2000) Use of heart rate to measure intrinsic state of blind cave crayfish during social interactions. Comparative Biochemistry and Physiology A.127:55-70. [FullText.pdf] (Listerman and Deskins were undergraduates in my laboratory at UK). Li, H. and Cooper, R.L. (2002) The effect of ambient light on blind cave crayfish: Social interactions. Journal of Crustacean Biology 22:449-458 [PDF] (Li is my PhD student). Listerman,
L., Deskins, J., Bradacs, H., and Cooper, R.L. (2000) Measures of heart
rate during social interactions in crayfish and effects of 5-HT. Comparative
Biochemistry and Physiology A.125:251-264 [Abstract]
[FullText.pdf] Miller,
G. Tyler Jr. 2000. Living in the Environment. 11th ed. Pacific Grove,
CA. Brooks/Cole Pagé, M.-P., Hailes, W., and Cooper, R.L. (2007) Modification of the tail flip escape response in crayfish by neuromodulation and behavioral state with and without descending CNS input. (In Press-International Journal of Zoological Research). [Galley proof-PDF] Renn, C. R. 1970. Investigating Water Problems. LaMotte Company, Chestertown, Maryland. Schapker,
H., Breithaupt, T., Shuranova, Z., Burmistrov, Y. and Cooper, R.L. (2002)
Heart rate and ventilatory correlative measures in crayfish during environmental
disturbances & social interactions. Comparative Biochemistry and Physiology
A 131:397-407. [FullText.pdf]. Wilkens, J.L., Mercier, A.J., Evans, J., 1985. Cardiac and ventilatory responses to stress and to neurohormonal modulators by the shore crab Carcinus maenas. Comp. Biochem. Physiol. C, 82, 337-343. |
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