vertebrate bio Flashcards
what are the four types of native frog and where do they come from
all leiopelma archeyi - northland hockstetteri - north north island hamiltoni - top of south island pakeka - malborough sounds
all the native NZ frogs are t_____. Why?
terrestrial
aquatic tadpole stage would be washed down the mountain streams
give ways in which new zealand native frogs are primative
no tympanic membrane, middle ear or vocal chords
9 presarchal vertebrae but 8 in modern
no tadpole stage
few and large eggs
there are no native u____ in nz. but there e_____ n__ is an inasive species
urodels e.g. salamanders and newts
european newt
native nz frogs can be called g——— frogs
gondwanan
describe the introduced frogs of new zealand
all from oz
have tympanum
ranoidea aurea - green gold bell frog north island
ranoidea - raniformis green southern bell frog wide spread
litoria ewingi - whistling tree frog south island north e.g. hamner springs
what are the problems with coming onto land from the water
oxyegn - all bony fish had lungs
CO2 - concentration increases on land which effects blood ph
desication - less of a problem in a humid climate
air 800 times less dense than water gravity becomes a problem
temperture regulation , water has a higher specific heat capacity so the temperture in the air is less stable
explain why the emergence onto land more likely occured from freshwater
seas or larger and are therefore more homogenous
evolution requires change to work
freshwater ponds are far more variable
describe the alfred romer model - seasonal climate model of land emergencce
give its flaws
move out of the pond to search for another in hot conditoins
if a pond is drying up then it is unlikely that the fish could survive the parched land
describe the pough or tropical rainforest model for emergence onto land
leaves fall into ponds in the rainforest which makes it far more anoxic
fish go to the shallower parts of the pond
pectoral fins allow standing
smaller fish chased into even shallower water
give 6 potential lines of evidence for either side of rthe endo vs ecto dino debate
blood flow phylogentic analysis fossil evidence gigantothermy bone structure growth rates
desccribe the argument that dinosaours were endotherc based on blood flow
the size of the nutruent foramen in the femur acts as a measure for blood flow
crocodiles and reptiles have far smaller than mammals
dinos were even larger than mammals - suggestive of a higher metabolism
describe the dino bone stucture argument
lamellar zonal bone tissue in reptiles
- low density of vascual cannals
- low metabolism
fibro lamellar bone tissue more in mammals
- high density vascualr cannals
high metabolism
dinos bone structure very similar to mammals
desribe the growth rate argument
use growth rings in bones, old bones are metabolised
growth rates are more similar to mammals much faster than modern crocodiles
describe the phylogenetic analysis argument
not conclusive
sit between crorcdiles and birds corcs are ecto birds are endo