Ecology: Communitiy

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Commensalism

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98 Terms

1

Commensalism

________: one member derives a benefit while the other is not benefited or harmed.

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2

Ectoparasites

________: parasites that live on the external surface of a host.

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3

Defensive mutualism

________: animal defends a plant or herbivore.

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4

Grass pink orchid

________ produces no nectar, but it mimics the nectar- producing rose pogonia and is therefore still visited by bees.

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5

Food chains

________ link trophic levels from producers to top carnivores.

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6

Conjugation

________: unites results of oxidation with another molecule to create inactive and readily excreted product.

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7

Trophic structure

________: the feeding relationships between organisms in a community.

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8

Plants

________ cheat seed- dispersal agent out of meal with barbs or hooks on seeds.

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9

Phoresy

________: one organism uses another for transportation.

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10

Cryptic coloration

________, or camouflage, makes prey difficult to spot.

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11

Endoparasites

________: parasites that live within the body of their host.

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12

Predation

________ (+-/interaction): interaction where one species, the predator, kills and eats the other, the prey.

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13

Mutualisms

________ are beneficial- but optimal needs of each party can be different.

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14

Interspecific interactions

________: relationships between species in a community.

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15

Sugar maples

________ have a major impact on shading and soil nutrient availability in eastern North America 🡪affects the distribution of other plant species.

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16

Parasitism

________ (+-/interaction): one organism, the parasite, derives nourishment from another organism, its host, which is harmed in the process (does not usually kill it outright)

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17

Animals

________ also have morphological and physiological defense adaptations.

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18

Relative abundance

________: the proportion each species represents of the total individuals in the community.

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19

Secondary metabolites

________: not part of primary.

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20

Resource partitioning

________: differentiation of ecological niches, enabling similar species to coexist in a community.

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21

similar species

Ecologically ________ can coexist in a community if there are one or more significant differences in their niches.

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22

Donor

________- controlled system: prey supply is determined by factors other than predation, such as food supply.

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23

Flower inhabiting mites

________ use hummingbird nostrils.

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24

Facultative mutualism

________: the species cant live apart.

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25

Facilitation

________ (+ /+ or 0 /+): an interaction where one species can have positive effects on another species without direct and intimate contact.

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26

Herbivores

________ can overcome plant defenses.

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27

Keystone species

________: exert strong control on a community by their ecological roles, or niches.

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28

Inhibition

________: species replacement is prevented by previous colonists.

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29

Tolerance

________: species replacement is unaffected by previous colonists.

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30

Fungus

________ produces gongylidia as ant food.

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31

Dispersive mutualism

________: one species receives food in exchange for helping the flower spread their pollen.

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32

Generalist herbivores

________: can feed on many plant species.

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33

Specialist herbivores

________: restricted to one or two host plants.

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34

Species diversity

________: the variety of organisms that make up the community.

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35

Obligatory mutualism

________: neither species can live alone.

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36

Oxidation

________: catalysis of secondary metabolite to corresponding alcohol by mixed- function oxidases (MFOs)

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37

Displays of intimidation

________: deceive predator about ease of eating prey.

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38

Importance of predation

________ depends on whether its a donor- controlled system or a predator- controlled system.

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39

Ants

________ chew up leaves to feed to fungus they care for.

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40

Trophic mutualism

________: both species utilize a common resource.

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41

Dominant species

________ are most competitive in exploiting resources vs they are most successful at avoiding predators.

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42

Behavioral defenses

________ include hiding, fleeing, forming herds or schools, self- defense, and alarm calls.

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43

Invasive species

________, typically introduced to a new environment by humans, often lack predators or disease.

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44

Ecological niche

________: the total of a species use of biotic and abiotic resources.

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45

Interspecific interactions

________ can affect the survival and reproduction of each species,

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46

Herbivory

________ can be lethal to small species.

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47

Facilitation

________: species replacement is assisted by previous colonists.

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48

Mutualism

________: close associations between species in which both species benefit.

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49

Community

an assemblage of populations of various species living close enough for potential interaction

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50

Ecological niche

the total of a species use of biotic and abiotic resources

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51

Resource partitioning

differentiation of ecological niches, enabling similar species to coexist in a community

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52

Fundamental niche

the niche potentially occupied by that species

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53

Realized niche

the niche actually occupied by that species

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54

Interspecific interactions

relationships between species in a community

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55

Intraspecific competition

competition between individuals of the same species

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56

Interspecific competition

competition between individuals of different species

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57

Exploitation competition

organisms compete indirectly through the consumption of a limited resource

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58

Interference competition

individuals interact directly with one another by physical force or intimidation

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59

ex

Bombardier beetle ejects hot spray

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60

Displays of intimidation

deceive predator about ease of eating prey

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61

ex

Porcupine fish inflates itself

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62

Donor-controlled system

prey supply is determined by factors other than predation, such as food supply

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63

Predator-controlled system

action of predator feeding reduces supply of prey

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64

Generalist herbivores

can feed on many plant species

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65

Specialist herbivores

restricted to one or two host plants

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66

Secondary metabolites

not part of primary

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67

Oxidation

catalysis of secondary metabolite to corresponding alcohol by mixed-function oxidases (MFOs)

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68

Conjugation

unites results of oxidation with another molecule to create inactive and readily excreted product

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69

Endoparasites

parasites that live within the body of their host

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70

Ectoparasites

parasites that live on the external surface of a host

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71

Mutualism

close associations between species in which both species benefit

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72

Trophic mutualism

both species utilize a common resource

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73

Example

Leaf-cutting ants and fungus

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74

Defensive mutualism

animal defends a plant or herbivore

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75

ex

Ants protect aphid, aphid secretes honeydew

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76

Facultative mutualism

the species cant live apart

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77

ex

Ants nesting in acacia trees defend the tree and trim away competing plants

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78

Obligatory mutualism

neither species can live alone

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79

Dispersive mutualism

one species receives food in exchange for helping the flower spread their pollen

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80

Mutualisms are beneficial

but optimal needs of each party can be different

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81

Commensalism

one member derives a benefit while the other is not benefited or harmed

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82

ex

Epiphytes growing in trees do not harm the trees

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83

ex

Cattle egrets benefit from cattle stirring up insects

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84

Phoresy

one organism uses another for transportation

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85

Facilitation (+/+ or 0/+)

an interaction where one species can have positive effects on another species without direct and intimate contact

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86

Facilitation

species replacement is assisted by previous colonists

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87

Inhibition

species replacement is prevented by previous colonists

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88

Tolerance

species replacement is unaffected by previous colonists

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89

Species diversity

the variety of organisms that make up the community

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90

It has two components

species richness and relative abundance

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91

Species richness

the total number of different species in the community

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92

Relative abundance

the proportion each species represents of the total individuals in the community

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93

Trophic structure

the feeding relationships between organisms in a community

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94

Dominant species

the species that are most abundant or have the highest biomass

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95

Keystone species

exert strong control on a community by their ecological roles, or niches

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96

Ecological succession

the sequence of community and ecosystem changes after a disturbance

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97

Primary succession

when succession begins; occurs where no soil exists

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98

Secondary succession

begins in an area where soil remains

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