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microbial ecology > Chapter 20: General ecological concepts > Flashcards

Chapter 20: General ecological concepts Flashcards

1
Q

Ecosystem

A

The sum total of all rganisms and abiotic factors in a particular environment

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2
Q

Habitat

A

Portion of an ecosystem where a community could reside
-conatins many different habitats
-M account for 50% of biomass and are on surface and deep within earth

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3
Q

Population

A

A group of M of the same species that reside in the same place and time
-May be descendants of a single cell

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4
Q

Community

A

Consists of populations living in association with other populations

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5
Q

Diversity measurements

A

Species richness
Species abundane
-functions of kinds and amounts of availible nutrients

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6
Q

Species richness

A

Total no. of different species present

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7
Q

Species abundance

A

Proportion of each species in an ecosystem

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8
Q

Guilds

A

Metabolically related M populations
-Sets of guilds form M communities that interact with macroorganisms and abiotic factors in ecoystem

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9
Q

Niche

A

Habitat shared by a guild
-Supplies nutrients as well as growth conditions

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10
Q

Photic zone

A

Oxygenic phototrophs

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11
Q

Oxic zone

A

Aerobes and facultative aerobes

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12
Q

Anoxic sediments

A

G1
G2
G3
G4

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13
Q

Guild (G) 1

A

denitrifying bacteria
-ferric iron-reducing bacteria

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14
Q

G2

A

Sulfate-reducing B
Sulfur-reducing B

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15
Q

G3

A

Fermentative B

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16
Q

G4

A

Methanogens
acetogens

17
Q

Biogeochemistry

A

The study of biologically mediated chemical transformations

18
Q

Biogeochemical cycle

A

The transformations of a key element by biological or chemical agents

19
Q

M and cycling elements

A

Cycle C,N, S and Fe between different chemical forms
-Typically redox reactions
-M play a critical role in energy transformations and biogeochemical processes that result in recycling of elements to living systems

microbial ecology (6 decks)

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