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What are the limitations or constraints that can lead to sampling bias when creating a study about seagrass density in an area?
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- List three methods of “cherry picking data” and the advantages each provides.What is the Shannon diversity index value for this community? What is the Species evenness value for this community?In constructing a mathematical model for population growth of tilapia grown in fishpens, which factor(s) may be included in model.
- Species: fox squirrel Question: What sampling method would you use to estimate N and why?What is the difference between density dependent and density independent limiting factors?Quadrat sampling is a method by which organisms in a certain proportion (sample) of the habitat are counted directly. As with all sampling methods, it is used to estimate population parameters when the organisms present are too numerous to count in total. It can be used to estimate population abundance (number), density, frequency of occurrence, and distribution. Quadrats may be used without a transect when studying a relatively uniform habitat. In this case, the quadrat positions are chosen randomly using a random number table. The general procedure is to count all the individuals (or estimate their percentage cover) in a number of quadrats of known size and to use this information to work out the abundance or percentage cover value for the whole area. The number of quadrats used and their size should be appropriate to the type of organism involved (e.g. grass vs tree). Estimated average density Total number of individuals counted Number of quadrats X area of each quadrat Guidelines…
- ascertainment bias... The natural tendency to use surrounding information to resolve ambiguities Bias that is introduced by the process of collecting a sample or doing a search The tendency to focus on unusual or dangerous things A tendency to see the things that we want or expect to see none of aboveBeige and black rabbits were introduced into two meadows. One meadow predominantly consists of volcanic soil and the other predominantly consists of clay soil. Each rabbit was marked with a dot of blue paint and the pad of his foot. The number of rabbits released and recaptured one month later are shown in the table below. Assume the number of rabbits recaptured is a direct reflection of the number of rabbits surviving. Using the data below, what conclusions can you make regarding the color of rabbits and their survival in different soil types? VOLCANIC SOIL # released #recaptures % precentage beige rabbits 137 18 13.1% black rabbits 447 123 27.5% CLAY SOIL # released # recaptures % precentage beige rabbits 393 54 13.1% black rabbits 406 19 4.7%A small-scale farmer releases lady bugs to eat the aphids that are eating the farmer's crops. They also plant a local grass species that attracts a species of spider that eats aphids. What kind of agricultural system is being demonstrated in this example? Complete sentence not required For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph v Arial XQ ¶ ΨΩΘΗ 89 田く 10pt VE X² X₂&¶¶ 0) v E V AVA + ABC @ Ix ✓ ...
- Why are the four main topics of ecological risk analysis important to risk assessment?Explain the following sampling techniques that are used in selecting sample elements out of a population in research. Snowball sampling Stratified samplingMiss 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.
