Topic 23 Flashcards Preview

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Flashcards in Topic 23 Deck (28)
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1
Q

Community

A

group of species that occupy a given area that interact directly or indirectly under a particular set of environmental conditions

2
Q

All species that live together are interconnected

A

both indirect and direct relationships amount species are important for determining each species population dynamics and community structure

3
Q

Delineation of communities is somewhat ..

A

arbitrary and dependent on the focus on the researcher

4
Q

Community structure includes

A

physical structure of the environment and biological structure and the nature of species interactions

5
Q

Physical structure reflects ..

A

abiotic and biotic characteristics

6
Q

The range of environmental conditions or resources set a ..

A

limit on the number of spices and their relative abundance in a community

7
Q

The number of fundamental niches represents the ..

A

primary constraint on the biological structure of a community

8
Q

General pattern of community structure

A

more fundamental niches- the higher the number of species

9
Q

Biological structure

A

reflects the diversity of species in the community and their interactions w each other

10
Q

Biological structure is defined by ..

A
  • species richness (S=number)
  • relative abundance of species
  • species composition (type of species that make up community)
11
Q

A larger number of species in community does not necessarily mean..

A

higher diversity

12
Q

Evenness

A

equitable relative abundance of species in a community

13
Q

Dominance

A

inequitable relative abundance of species in a community

14
Q

Where individuals vary in size ..

A

abundance alone may not be a sufficient indicator of dominance

15
Q

Define dominance based on a combination of..

A

abundance and size (% cover in plants and % biomass of animals)

16
Q

High dominance means…

A

low diversity (high evens =high diversity)

17
Q

Biodiversity

A

biological structure of the community

18
Q

Biodiversity can become ..

A

complex (formulas that exist to calculate it=diversity indices)

19
Q

Diversity indices

A

simpsons and shannon-weaver

20
Q

Rank abundance plots can show us..

A
  • species richness

- slop of the line tells us evenness

21
Q

Straight horizontal line indicates..

A

high evenness

22
Q

Steep slope indicates..

A

lower evenness

23
Q

Most abundant species =

A

rank 1

24
Q

Many scientists argue that all communities have ..

A

one typical pattern of abundance which is few abundant species, few rare species and most species of moderate abundance

25
Q

Different curves reflect different..

A

sampling efforts

26
Q

Indirect interactions are …

A

difficulty to study the interactions between 2 species in nature without considering their interactions with other species

27
Q

Community is characterized by ..

A

many direct and indirect interactions

28
Q

High abundance of iva there will be more..

A

apeds