definitons

Question 1

Anadromous

Answer 1

(of a fish such as the salmon) migrating up rivers from the sea to spawn. Opposite of catadromous

Question 2

Catadromous

Answer 2

(of a fish such as the eel) migrating down rivers to the sea to spawn. The opposite of anadromous

Question 3

Ecotone

Answer 3

Ecotones are abrupt changes in vegetation or two adjacent, different and homogenous community types, producing a narrow ecological zone between them

Question 4

Recruitment

Answer 4

survival of offspring to a defined stage:
•the exploited stock (fisheries)
• the adult populations (fisheries, ecology)

Question 5

settlement

Answer 5

point at which organism takes up benthic/demersal existence

Question 6

Commensalism

Answer 6

association between two organisms in which one benefits and the other derives neither benefit nor harm

Question 7

mutualism

Answer 7

interaction between individuals of different species that results in positive effects on per capita reproduction and/or survival of the interacting populations

Question 8

facilitation

Answer 8

interaction in which the presence of one species alters the environment in a way that enhances growth, survival or reproduction of a second, neighbouring species

Question 9

Invasibility

Answer 9

alien species, or species that are not native, invade habitats and alter ecosystems around the world.

Question 10

succession

Answer 10

The non-seasonal, directional and continuous pattern of colonisation & extinction of species populations

Question 11

Primary succession

Answer 11

succession in an area where no organisms are present

Question 12

Secondary succession

Answer 12

succession in an area where a biological community is partially intact

Question 13

Degradative succession

Answer 13

succession on or in dead or dying organic matter

Question 14

Principle of allocation

Answer 14

States that each individual organism has a finite (limited) quantity of resources that it can use for all necessary life processes