5. Cyanobacteria live mostly in aquatic habitats but they can also b.pdf
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5. Cyanobacteria live mostly in aquatic habitats but they can also be found on landin deserts of all places! They lie dormant for much of the year, as it is so dry, but when it rains they become active metabolically. Although rain is good for them, it is potentially harmful for us, because these desert cyanobacteria produce harmful toxins that can be kicked up in dust storms. One might guess that the concentration of these harmful toxins is highest in soil just after it rains. To test this, imagine running an experiment in which you have four treatment groups: 1.) intact/unwatered; 2.) disturbed/unwatered; 3.) intact/watered; and 4.) disturbed/wateredwhere intact means that the surface layer of desert soil is left in place and disturbed means that 0.5cm from the surface has been scraped off, and watered versus unwatered means what it sounds like. You have a sample size of 5 in each treatment group. After ten days of watering or not watering, you measure the average concentration of the toxin in each treatment group and compare the four averages. The null hypothesis is that the mean toxin concentrations are equal across the four treatment groups. You perform a Kruskal-Wallis H test, which is a null-hypothesis significance test. The critical value for this experiment at the 0.05 level is H = 7.4; at the 0.01 level it is H = 9.8. For your data, the observed H = 10.6. First, in light of these results, what decision should you make, and second, how would you write that result up in a single sentence for the Results section of a scientific paper?.
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Use the
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Hi Everyone,
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Lab 3
Biodiversity
Biodiversity
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Introduction
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Ecosystem diversity
Genetic diversity
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not correspond with diversity within other levels. The degree
of biodiversity, and thus the health of an ecosystem, is im-
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The term species refers to a group of similar organisms that
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Ecosystem diversity examines the different habitats, biological communities, and ecological process-
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diversity are complex, and include biotic and abiotic factors.
Concepts to Explore
Biodiversity
Species diversity
Ecosystem diversity
Genetic diversity
Natural selection
Extinction
Figure 1: There are more than 32,000 species of
fish – more than any other vertebrate!
Biodiversity
35
The variation of genes within individual organisms is genetic diversity.
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Diversity is also influenced by natural selection, the key mechanism of
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(habitat). Genetic variations among species provide an advantage over
other species if those variations result in the ability to survive and repro-
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hundredth (two places past the decimal).
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Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
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Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
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Chapter 5
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Chapter 6
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