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As a rule of thumb, foresters (and other biologists) should strive to sample at least 30 points or plots in a stand. WHY?
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- Differentiate transect and quadrat sampling. What are strengths and weaknesses of using such methods in doing terrestrial community ecologyYou've been out in the field collecting data on the predation of holly leaves. You collect 200 leaves in total of which 100 leaves contain one mine, 20 leaves contain 2 mines and 30 leaves contain 3 mines. After close examination with your hand lens and dissecting microscope you categorize a total of 15 mines with round holes, 9 mines that were torn open and 27 mines with an irregular hole. After some basic analyses you conclude that the predation rates by blue tits and wasps are: A. 3.7% and 6.5% B. 6% and 10% C. 10% and 6% D. 4% and 6.5%What evidence would convince you that a grassland was experiencing top-down control versus bottom-up control?
- What are three ways an ecologist might capture an animal? one way an ecologist might sample a plant population in order to estimate numbers of plants?Miss L is bored in the summer, so she wants to estimate the population of weeds on her property. The property measures 20 m x 20 m. She randomly places ten 1 m x 1 m quadrats on her property as shown in the diagram below. What is the estimated population size? Only write the numerical value.Miss l is bored in the summer, so she wants to estimate the population of weeds on her property. The property measures 20 m x 20 m. She randomly places ten 1 m x 1 m quadrats on her property as shown in the diagram below. What is the estimated population size?
- Why is sustainability such an important goal for conservation biologists?Table 1. Average turgor loss point, stem hydraulic conductivity and plant water use efficiency for the two species. Trait Species A Species B Statistics Turgor loss point -2.5 MPa -1.1. MPa p <0.033 Hydraulic conductivity 0.11 Kg mm-1 MPa-1 s-1 0.33 Kg mm-1 MPa-1 s-1 p <0.005 Water use efficiency 80.6 µmol mol-1 47.1 µmol mol-1 p <0.004 Explain using data from Table 1 and Figure 2 the two different physiological strategies for these species against the environmental stressors expected from Figure 1. Figure 2.(attached) Pre-dawn and midday leaf water potential (Ψleaf) for the two species at different dates throughout the year.Table 1. Average turgor loss point, stem hydraulic conductivity and plant water use efficiency for the two species. Trait Species A Species B Statistics Turgor loss point -2.5 MPa -1.1. MPa p <0.033 Hydraulic conductivity 0.11 Kg mm-1 MPa-1 s-1 0.33 Kg mm-1 MPa-1 s-1 p <0.005 Water use efficiency 80.6 µmol mol-1 47.1 µmol mol-1 p <0.004 Please Describe the data in Table 1
- What is your take on the value of biodiversity for health and medecine? What are the parameters to distinguish the good and bad ways of utilizing biodiversity in this context?Ernie's school has three greenhouses, located in three parts of the school. Ernie notices that the plants in one greenhouses are smaller than the same species in the other greenhouses. Ernie's biology teacher says she has been having a problem recently with growing plants in this particular greenhouse. Ernie's lab group decides to investigate factors such as light levels, temperature, and soil nutrients in the three greenhouses. They find that these are the same for all the rooms. What additional factors would you suggest testing for, and how would each of these factors affect the growth of plants? 20What do the scattered dots represent in the forest tree community models? What other information can be extracted from the model? Describe the importance and limitations of the model.