BIOL 1620 Lecture 6: Community ecology and biodiversity

34 views16 pages

azuremouse502

6 Jul 2016

School

Utah State University

Department

Biology

Course

BIOL 1620

Professor

Mott

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

How species interact with each other can have major ecological consequences. Ecological community: all the species in a given area. We are looking at the species level now. That is to say, which are common, which are rare and why. In real natural communities with so many species, there are going to be many interactions and you can construct a food. Web with many lines connecting all the species. Any given focal species will interact with a wide variety of other species. Pair-wise interactions instead of multiple species interactions (which is what normally occurs in nature) to simplify the concepts. The effect of the interaction between one species and another species on each other"s densities. Sometimes, on each other"s presence (whether they can coexist). Competition: two species have to use a limited resource in a local environment, they have reciprocal negative effects on each other"s densities. The presence of species 1 suppresses species 2 and vice-versa.

Related Questions

Why does sodium react so easily with chloride to make sodium chloride?

	A.	Both atoms have incomplete outer orbitals and they complete each other's when they combine
	B.	Sodium chloride is table salt, one of the most reactive molecules in living things.
	C.	Opposites attract.
	D.	Both atoms have outermost shells full of electrons.
	E.	Sodium chloride is highly explosive.

What is meant by the statement âlife is diverse?â

	A.	There are many living organisms on Earth
	B.	Each living thing is a unique individual.
	C.	All living things are related to each other.
	D.	There are many different kinds of living organisms on Earth
	E.	There are many places to live on Earth.

What is considered the fundamental unit of life?

	A.	DNA
	B.	Carbohydrates
	C.	A molecule
	D.	Nucleic acid
	E.	A cell

In evolution, why is it important that individuals vary from each other?

	A.	Variation allows some individuals to do better than others, so those variations are selected for.
	B.	If variations or mutations are extreme enough, new species can result.
	C.	Variations are important because individuals have to change through time.
	D.	Variations are important because they're inherited.
	E.	Variation gives every individual an equal chance of surviving so they can be selected for.

If every species on Earth came from some other species, if you look backwards in time, what is the logical conclusion?

	A.	Species do not change through time.
	B.	All species are unique.
	C.	Species cannot adapt to environmental changes.
	D.	All species will eventually go extinct.
	E.	All species are related.

1. What is a âlognormalâ distribution? Have you heard this kind of a distribution under a different name?

Lognormal distribution is a distribution of relative abundances of species by plotting the abundance of species as a frequency distribution in which each abundance interval is twice the preceding one (1, 2, 4, 8).

-It is a statistical expectation

-Product of many random environmental variables acting on the population of species

2. Why would a species survey with a greater sample size show a more complete lognormal distribution than a survey with a smaller sample size?

3. What two factors are considered in a quantitative diversity index? How do these factors differ from each other?

4. Explain how environmental heterogeneity can generate both aquatic and terrestrial plant diversity.

5. Consider the intensity of some disturbance in a community along a gradient (lowâ¦ mediumâ¦ high intensity). Use a âGoldilocks and the Three Bearsâ analogy to explain how species diversity can be shaped by disturbance along such a gradient.

16. Which of the following statements best describes a commensal symbiotic relationship between two species? Both species benefit. One species benefits and the other is unaffected. One species benefits and the other is harmed. Both species are harmed.

17. The fundamental niche of an organism is determined by ______ factors, while the realized niche is determined by ______ factors. biotic; abiotic abiotic; biotic biotic; biotic abiotic; abiotic

18. Competition between species can be reduced as a result of character displacement. This is because one of the species becomes extinct. the species will no longer compete for the same resource. the niche of at least one of the species is changed. Both B and C are correct.

19. When they winter in Central and South America, robins form flocks and feed on fruit. During the summer, they migrate to North America, where they feed on caterpillars, earthworms and other animals. These birds are best described as herbivores. omnivores. detrivores. carnivores.

20. For your final examination before you receive your degree from Penn State, you have been given a slide that contains an unknown tissue from a multi-cellular eukaryote. You have been asked to identify if that tissue is from an animal, a fungus, or a plant. As you stare through the microscope at the slide, you remember that you learned the major differences between these cells in Biology 11. You look for the presence of ______, found only in plant cells, and the absence of ______, never seen in animal cells. But, the cells that you are looking at have a cell wall and do not have chloroplasts. You confidently circle ______ on the answer sheet. chloroplasts; mitochondria; animal mitochondria; chloroplasts; animal chloroplasts; cell walls; fungus mitochondria; cell walls; fungus

BIOL 1620 Lecture 6: Community ecology and biodiversity

Document Summary

Get access

Related Documents

BSC 2011 Lecture 36: Ecology Lecture 6

BSC 2011 Lecture Notes - Lecture 7: Interspecific Competition, Limiting Factor, Niche Differentiation

01:119:115 Lecture Notes - Lecture 25: Eugene Odum, Ecological Niche, Niche Differentiation

Related Questions