lecture 3 - mangroves structure and herbivory Flashcards Preview

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Flashcards in lecture 3 - mangroves structure and herbivory Deck (10)
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what characterise mangrove forests?

1) gradients in tree height
2) species zonation


describe the point centred quarter method

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


what does salinity correlate with in mangroves?

> strong correlation of canopy height with salinity - but variable


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

> Landward:
- Rhizophora and avicenna and lumnitzera


what herbivores prey n mangroves?

> lots of different insects
> create holes, marginal bites, scrapes and mines


describe mines

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


describe galls

> pimples
> animal living inside
> leaf reacts and grows around it


describe what molluscs do to the mangrove

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


how do nutrients effect mangrove growth and herbivory?

> very site specific
> gallers more abundant on more northern areas


what are the indirect effects of feeding injury to avicennia?

> premature leaf abscisson
> distorted smaller leaves