lecture 3 - mangroves structure and herbivory

Question 1

what characterise mangrove forests?

Answer 1

1) gradients in tree height

2) species zonation

Question 2

describe the point centred quarter method

Answer 2

> transects
groups are going to work landward to seaward
either measure juveniles or adults
make rules and stick to them

Question 3

what does salinity correlate with in mangroves?

Answer 3

> strong correlation of canopy height with salinity - but variable

Question 4

what is the most abundance species on the landward and seaward sides?

Answer 4

> Landward:

- Rhizophora and avicenna and lumnitzera

Question 5

what herbivores prey n mangroves?

Answer 5

> lots of different insects

> create holes, marginal bites, scrapes and mines

Question 6

describe mines

Answer 6

> live between the leaf tissues
layed eggs inside
moth or fly

Question 7

describe galls

Answer 7

> pimples
animal living inside
leaf reacts and grows around it

Question 8

describe what molluscs do to the mangrove

Answer 8

> graze on the sediment during liw tide and goes up on trees at high tide
the grazes on leaves

Question 9

how do nutrients effect mangrove growth and herbivory?

Answer 9

> very site specific

> gallers more abundant on more northern areas

Question 10

what are the indirect effects of feeding injury to avicennia?

Answer 10

> premature leaf abscisson

> distorted smaller leaves