30 - threats to biodiversity

Question 1

some factors that may have lead to mass extinctions

Answer 1

-volcano eruptions due to tectonic plates moving and change in climate

-ocean acidification

-asteroids

-plants increase O1 and decrease CO2 in atmosphere-> cooling

-increased weathering of rocks and the release of phosphor due to an increase of land plants led to an increase in algae and ocean anoxia

Question 2

what did the Ordovician-Silurian extinction wipe out?

Answer 2

many marine invertebrates

Question 3

what did the Ordovician-Silurian extinction benefit?

Answer 3

jawless fish and other early vertebrates

Question 4

what was wiped out in the devonian extinction?

Answer 4

many ancient fish species

Question 5

what did the devonian extinction benefit?

Answer 5

early land vertebrates and seed plants

Question 6

what did the permian-terassic extinction wipe out?

Answer 6

many marine vertebrates, amohibians, proto mammals

Question 7

at species benefited from the permian-triassic extinction?

Answer 7

dinosaurs

Question 8

what did the cretaceous-paleogene extinction wipe out?

Answer 8

non-avian dinosaurs

Question 9

what did the cretaceous-plaeogene extinction benefit

Answer 9

small mammals, birds, flowering plants

Question 10

factors determining how habitat fragmentation affects wildlife

Answer 10

-species (size, movement, behavior etc)
-the size and shape of fragments
-the distance between fragments
-the characteristics of the matrix
-the connectivity between fragments

Question 11

what is habitat fragmentation?

Answer 11

the habitat may be able to support populations

Question 12

what is habitat degradation?

Answer 12

the habitat quality is reduced. habitat cannot support large populations. birth rates may be low/or high death rates

Question 13

what is habitat loss?

Answer 13

habitat cannot support any populations