Ecology and EEMB 2 Overview
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Questions and Answers

What is the primary focus of ecology?

  • The study of human anatomy
  • The study of animal behavior
  • The study of climate change
  • The study of the distribution and abundance of organisms (correct)

Suspension and expulsion are possible consequences of academic dishonesty at UCSB.

True (A)

What was the focus of Ronald Ross's work in ecology?

Mathematical model of the spread of infectious disease

Farr’s rule relates population ________ to mortality rates.

<p>density</p> Signup and view all the answers

Match the following ecologists with their contributions:

<p>Malthus = Population regulation Quetelet = Population regulation Forbes = Community regulation and succession Cowles = Community regulation and succession</p> Signup and view all the answers

Which components are covered in the Ecology section of EEMB 2?

<p>Population growth and species interactions (A)</p> Signup and view all the answers

EEMB 2 students must take both the evolution and ecology exams.

<p>False (B)</p> Signup and view all the answers

What is the total number of points for grading in EEMB 2?

<p>220</p> Signup and view all the answers

The course format includes _____ lectures that are recorded and posted online.

<p>in-person</p> Signup and view all the answers

Match the following course components with their descriptions:

<p>Midterm Exam = 100 pts, multiple-choice with problem-solving Final Exam = 100 pts, non-cumulative Computation Sets = 3 ecology and 3 evolution problems, 3 pts each Office Hours = 2 per week via Zoom for student support</p> Signup and view all the answers

How many problem sets do students need to complete in EEMB 2?

<p>3 ecology and 3 evolution (B)</p> Signup and view all the answers

Office hours are conducted in person and do not require any prior appointment to attend.

<p>False (B)</p> Signup and view all the answers

Who should Z students contact if they have questions regarding the exams?

<p>Ms. Nguyen</p> Signup and view all the answers

Who is considered one of the founders of modern ecology?

<p>Charles Elton (B)</p> Signup and view all the answers

Until 1960, ecology was regarded as a significant science by the general population.

<p>False (B)</p> Signup and view all the answers

What are the two main types of components in an environment?

<p>Abiotic and Biotic</p> Signup and view all the answers

A group of individuals of the same species living in the same geographical area is called a _____

<p>population</p> Signup and view all the answers

Match the following levels of biological organization with their definitions:

<p>Organism = A single individual of a single species Community = Two or more populations living in the same area Ecosystem = Community plus its physical environment Biosphere = Regions occupied by living organisms</p> Signup and view all the answers

Which statement is correct about ecological scales?

<p>Each level operates at different biological, temporal, and spatial scales. (B)</p> Signup and view all the answers

The biosphere includes both living organisms and their physical environment.

<p>True (A)</p> Signup and view all the answers

What type of factors are abiotic components?

<p>Non-living chemical and physical factors</p> Signup and view all the answers

What level of explanation in ecology focuses on interactions among organisms?

<p>Community (B)</p> Signup and view all the answers

Ecological evidence can only be gathered through laboratory experiments.

<p>False (B)</p> Signup and view all the answers

What is the significance of a P-value less than 0.05 in hypothesis testing?

<p>It indicates that the results are statistically significant.</p> Signup and view all the answers

Ecological levels of explanation operate at longer time scales and larger spatial scales than __________ mechanisms.

<p>physiological</p> Signup and view all the answers

Match the following ecological evidence methods with their descriptions:

<p>Observation and monitoring = Collecting data in natural settings over time Manipulative field experiments = Changing conditions in a natural environment to observe effects Controlled laboratory experiments = Testing hypotheses under controlled conditions Mathematical models = Using equations to represent ecological processes</p> Signup and view all the answers

Which concept refers to the estimation of population parameters in ecology?

<p>Random sampling (C)</p> Signup and view all the answers

Statistical approaches in ecology help in obtaining random samples to reduce sampling error.

<p>True (A)</p> Signup and view all the answers

What is the goal of ecology?

<p>To observe patterns, describe processes, and use this information to predict, manage, and control.</p> Signup and view all the answers

What is needed to determine the probability of getting a value greater than 75?

<p>The frequency of values of 75 or greater (C)</p> Signup and view all the answers

In a normal distribution, 50% of the data falls on either side of the mean.

<p>True (A)</p> Signup and view all the answers

What statistical measure is used to control the spread of a normally distributed dataset?

<p>standard deviation</p> Signup and view all the answers

The probability of getting a value of 75 or greater in the left plot is approximately _____ (use decimal form).

<p>0.05</p> Signup and view all the answers

What is represented by the Z-test statistic in relation to a sample group's mean?

<p>How many standard deviations a datum is from the mean (C)</p> Signup and view all the answers

Biological data such as height is often normally distributed.

<p>True (A)</p> Signup and view all the answers

How many termites does the single troop capture on average, according to the practice question?

<p>96</p> Signup and view all the answers

Match the statistical concepts with their definitions:

<p>Standard Deviation = Measure of variability in a dataset Z-test Statistic = Measure of how many standard deviations a datum is from the mean Normal Distribution = Symmetrical distribution with a mean and equal halves Probability = Likelihood of a specific outcome occurring</p> Signup and view all the answers

What is the formula for calculating the standard error ($ackslash sigma_{p}^{^}$)?

<p>$ackslash sigma_{p}^{^} = SD/\sqrt{n}$ (D)</p> Signup and view all the answers

The null hypothesis states that there is no difference in capturing ability among different troops.

<p>True (A)</p> Signup and view all the answers

What is the population mean of termite captures by chimpanzees in the Congo?

<p>100</p> Signup and view all the answers

The standard deviation in the given scenario for termite capturing is ___.

<p>10</p> Signup and view all the answers

How many termites did the single troop of chimpanzees collect on average?

<p>96 (C)</p> Signup and view all the answers

Match the following terms with their definitions:

<p>Standard Error = The standard deviation of the sample mean Null Hypothesis = No difference between groups Population Mean = Average of the entire population Sample Mean = Average calculated from a sample</p> Signup and view all the answers

A Z-score is calculated by dividing the difference between the sample mean and population mean by the standard error.

<p>True (A)</p> Signup and view all the answers

What is the Z-score for the troop if they capture an average of 96 termites?

<p>2</p> Signup and view all the answers

Flashcards

Ecology

The study of how organisms interact with each other and their environment.

Evolution

The study of the origin and diversification of life on Earth.

Population Ecology

The distribution and abundance of organisms in a particular area.

Community Ecology

The study of how different species interact within a community.

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Microevolution

The change in the genetic makeup of a population over time.

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Speciation

The process by which new species arise.

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Macroevolution

The study of large-scale evolutionary trends.

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Genetic Diversity

A measure of the genetic diversity within a population.

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What is ecology?

The study of how organisms are distributed and how many exist in a certain area, including the factors influencing this distribution and abundance.

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What is human demography?

The study of human populations and their growth, including factors affecting their numbers, distribution, and changes over time.

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What is Farr’s rule?

A set of rules describing the relationship between population density and death rates.

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What is ecological succession?

The process of ecological change over time, often involving the gradual replacement of one community by another.

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What is systems analysis in ecology?

The analysis of how different parts of an ecosystem interact and contribute to its overall function.

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Abiotic Components

Non-living factors that influence organisms in their environment, including temperature, light, water, and nutrients.

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Biotic Components

Living organisms within an environment, including interactions like competition and predation.

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Interaction

The interconnectedness of abiotic and biotic components where organisms are influenced by their surroundings and in turn, modify them.

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Biological Scales

Levels of organization in biology, ranging from molecules to the biosphere.

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Population

Groups of individuals of the same species living in a specific location.

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Community

Different populations of species interacting within a defined space.

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Ecosystem

The combination of a community and its abiotic environment.

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Levels of Ecological Organization

The hierarchy of ecological organization, starting with the biosphere (largest) and progressing to molecules (smallest).

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Null Hypothesis

A statistical method used to test hypotheses in ecology by assuming no relationship between variables.

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P-value

A probability value that indicates the strength of evidence against the null hypothesis.

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Frequency Distribution

A graphical representation showing the frequency of different values in a dataset. Ecologists use frequency distributions to understand the probability of certain events or measurements within a population.

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Probability

The likelihood of a particular event or outcome occurring. Ecologists use probability to make predictions about populations and their behavior.

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Normal Distribution

Describes data that is symmetrically distributed around a central peak (mean). Most values cluster around the mean, with fewer occurrences towards the extremes.

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Z-test statistic

A statistical test that determines how many standard deviations a data point (sample mean) is from the population mean.

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Standard Deviation

A measure of the spread or variability of data points around the mean. It indicates the amount of variation within a population.

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Standard Error

The standard deviation divided by the square root of the sample size. It estimates the likely error when using a sample to represent the entire population.

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Z-Test

A statistical test that uses the Z-test statistic to determine if there is a significant difference between the sample mean and the population mean.

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Population Mean (Termites)

The average number of termites captured by chimpanzees during a 5-minute period in a particular region of the Congo.

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What is the standard error (σ ^p)?

The standard error (σ ^p) is a measure of the variability of the sample mean. It tells us how much the sample mean might deviate from the true population mean.

It is calculated by dividing the standard deviation (SD) of the population by the square root of the sample size (n).

Formula: σ ^p = SD / √n

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What is the Z-score?

The Z-score is a standardized measure of how many standard deviations a sample mean is from the population mean.

It is calculated by subtracting the population mean (μ) from the sample mean (x̄) and then dividing by the standard error (σ ^p).

Formula: Z = (x̄ - μ) / σ ^p

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What is the null hypothesis?

The null hypothesis is a statement that there is no difference between the sample mean and the population mean.

It is used in hypothesis testing to determine whether there is enough evidence to reject the null hypothesis in favor of an alternative hypothesis.

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What is standard deviation (SD)?

The standard deviation (SD) is a measure of how spread out the data is.

It tells us how much the individual data points deviate from the average.

Formula: SD = √(Σ(x - μ)²) / (n - 1)

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What is the sample mean (x̄)?

The sample mean (x̄) is the average of the data points in the sample.

It is calculated by summing all the values in the sample and then dividing by the number of values in the sample.

Formula: x̄ = Σx / n

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What is the population mean (μ)?

The population mean (μ) is the average of all the values in the population.

It is often unknown and must be estimated from a sample.

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Study Notes

Course Information

  • Course Title: Introductory Biology II - EEMB 2 (Introduction to Evolution & Ecology)
  • Course Year: Winter 2025
  • Instructors: Dr. Thomas Even and Dr. John Latto
  • Academic Coordinator: Dr. Alice Nguyen ([email protected])
  • Office Hours: Tuesdays and Thursdays 2:00-3:00 PM, and by appointment via Zoom ([email protected])
  • Course Website: https://www.canvas.ucsb.edu (Canvas is the interactive hub for course materials, syllabus, recorded lectures, lecture slides, problem sets, study guides, practice questions, and office hour links)

Course Goals and Sections

  • Course Goals: Introduction to population & community ecology, and evolution. (Detailed learning objectives available in the syllabus)
  • Ecology Section: Distribution of populations and communities, population growth and regulation, species interactions, community structure and dynamics, and species diversity.
  • Evolution Section: Microevolution, speciation, and macroevolution (adaptation, variation, natural selection, gene flow, genetic drift, reproductive isolation, and species formation).
  • EEMB 2 Z Students (Transfer Students): All Z students must take either the evolution or ecology exam. Consult Ms. Nguyen for any questions.

Course Format

  • All materials on Canvas.
  • In-person Lectures (synchronous): Then recorded and posted to Gauchocast (asynchronous)
  • Problem Sets (asynchronous): Three ecology problem sets and three evolution problem sets, with specific due dates listed in the syllabus.
  • Office Hours (synchronous): Two per week via Zoom; check the syllabus for specific days and times.
  • Examinations (synchronous): Midterm and final exams delivered online via Canvas quiz function during regularly scheduled lecture time.

Grading

  • Total Points: 220 points.
  • Midterm Exam: 100 points (non-cumulative, multiple choice with some mathematical calculations).
  • Final Exam: 100 points (non-cumulative, multiple choice with some mathematical calculations).
  • Computation Sets: 6 sets (3 ecology, 3 evolution), 3 points per set, totals 18.
  • Survey Questions: 2 points total (1 point per question).

Make-up Policy

  • Contact Dr. Nguyen within 24 hours to request a make-up exam. Verification of illness or an emergency is needed. Check with Dr. Nguyen immediately if there are problems with exam dates.

Academic Conduct

  • Standard UCSB policy applies. Cheating will result in failing grades, suspension, or expulsion.

Reading Material

  • Campbell Biology 12th edition (e-book or hardcopy). Assigned readings are listed in the syllabus.

Lecture Schedule (Partial)

  • January 7 (Ecology: Patterns and Processes)
  • January 9 (Distribution of populations & communities)
  • January 14, 16, 21 (Patterns of population growth)
  • January 23 (Species interactions: competition)
  • January 28 (Species interactions: predation/herbivory)
  • January 30 (Structure of ecological communities)
  • February 4 (Patterns of species diversity)
  • February 6 (Midterm Examination)

Additional Topics

  • Ecology (Definition): The study of the distribution and abundance of organisms, and the factors and interactions that determine distribution and abundance (Where are they? How many are there? Why?).
  • History of Ecology (Early influences) - Hunters and gatherers, Aristotle (350 BC - Historia Animalium), Herodotus & Plato (Providential Ecology).
  • History of Ecology (Later influences) - Graunt (1662), Leeuwenhoek (1687), Buffon (1756), Malthus (1798), Quetelet (1835), Verhulst (1838), Farr (1843), Edward Forbes (1887), Henry Cowles (1899), Ronald Ross (1908), A.G. Tansley (1904), F. E. Clements (1905), Charles Elton (1927), Rachel Carson (1962).
  • Environmental Components: Abiotic (non-living) factors (temperature, light, nutrients, water), and Biotic (living) factors (other organisms, competition, predation). Interactions between Abiotic and Biotic components (Organisms are affected by the environment, and their presence/activities change the environment).
  • Biological Scales: Levels of biological organization (from molecules to biosphere). Spatial and temporal scales of Ecology.
  • Ecological Scales: Definitions: Organism, Population, Community, Ecosystem, Biosphere.
  • Levels of Explanation (Mechanisms): Biosphere, Ecosystem, Community, Population, Organism, Tissue, Cells, Organelle, Molecule.
  • Ecological Evidence: Observation, Manipulative field experiments, Controlled laboratory experiments, Mathematical models. The goal of ecology is to observe patterns, describe processes, and use this information to predict, manage, and control.
  • Statistical Approaches in Ecology: Statistics for estimates of population parameters, Random sampling, application of statistics for level of confidence, Z-tests, Hypothesis testing (null hypothesis, P-values, significance testing in ecology). Normal Distribution, Frequency Distributions, Examples. Key terms like "datum" (sample mean), "μ" (population mean), "σ" (standard error).

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This quiz focuses on key concepts and components of ecology as taught in EEMB 2. It covers topics such as significant ecologists, important ecological rules, and course requirements. Test your knowledge on ecological principles and the grading structure of the course.

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