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June 1 - 3 , 1978 - University of Hawaii at Manoa

June 1 - 3 , 1978 - University of Hawaii at Manoa

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General Conclusions<br />

1. Zonal (or community) boundaries are evident from our d<strong>at</strong>a on<br />

species distributions, but boundary criteria need to be<br />

defined.<br />

2. Different organism-groups show different gradient sensitiv-<br />

ities which are peculiar to the organism group. ...<br />

3. Sp<strong>at</strong>ially associ<strong>at</strong>ed species groups occur in nearly all<br />

organism groups.<br />

4. N<strong>at</strong>ive species show a higher degree <strong>of</strong> sp<strong>at</strong>ial integr<strong>at</strong>ion<br />

than introduced species among plants, birds, and Droso-<br />

philids. However, the origin (whether a species is n<strong>at</strong>ive or<br />

non-n<strong>at</strong>ive) is not a general predictor for species distri-<br />

bution p<strong>at</strong>terns. These depend on the species ecological<br />

properties and the degree <strong>of</strong> n<strong>at</strong>uraliz<strong>at</strong>ion (i.e., habit<strong>at</strong><br />

s<strong>at</strong>ur<strong>at</strong>ion) among the exotics.<br />

5. There is not only one generalized p<strong>at</strong>tern <strong>of</strong> species distri-<br />

bution as Whittaker has claimed for temper<strong>at</strong>e mountain gra-<br />

dients. Instead we can recognize <strong>at</strong> least three dominant<br />

p<strong>at</strong>terns:<br />

1) Individually distributed species<br />

2) Sp<strong>at</strong>ially associ<strong>at</strong>ed, but overlapping species groups<br />

3) Various forms <strong>of</strong> widely distributed species. The domi-<br />

nance <strong>of</strong> the l<strong>at</strong>ter groups are probably a characteristic<br />

rel<strong>at</strong>ed to biota distribution on young island mountains.

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