Abstract:
The process of visual signalling between plant and animals is often a combination
of exciting discoveries and more often than not; highly controversial hypotheses.
Plants and animals interact mutualistically and antagonistically creating a complex
network of species relations to some extent suggesting a co evolutionary
network. In this study, I investigate two basic research questions: the first is
how plants utilize aposematic and cryptic colours? The second is how animals
are affected by the colour signals broadcasted by plants? By using the avian eye
model, I discover how visual signals/colours from plants are actually perceived,
and the effects of these signals on birds (not human) perception.
Aposematism and crypsis are common strategies utilized by animals, yet
little evidence is known of such occurrences in plants. Aposematic and cryptic
colours were evaluated by studying different colouration strategy through the
ontogeny of two native heteroblastic New Zealand plants: Pseudopanax
crassifolius and Elaeocarpus hookerianus. To determine the potential effect of
colour signals on animals, I investigated an evolutionary theory of leaf colours constraining the conspicuousness of their fruit colour counterparts. Based on
the available data, I also conducted a community level analysis about the
effects of fruit colours and specific avian frugivores that might be attracted
to them. Finally, I examined the fruit colour selection by a frugivorous seed
dispersing insect; the Wellington Tree Weta (Hemideina crassidens). My
result shows that aposematic and cryptic colours are successfully applied by
plants to either warn or remain inconspicuous from browsing herbivores. The
evidence I presented lends support to the Moa browsing hypothesis in relation to
constraining the conspicuousness of their fruit colour counterparts. Based on the cryptic plant colourations. However, the same level of selective interaction
could not be inferred for frugivore fruit colour selection based on avian vision. I
demonstrated that leaf reflectance does not constrain/influence the
conspicuousness of fruit colours. There was also no fruit colour diversity based
on geographical location. Fruit colour alone is not sufficient to influence a specific frugivore assemblage. Other environmental factors and species interaction must be
taken into account. Weta proved to possess colour vision capable of colour
perception even in low light conditions. Weta also consistently selected naturally
blue streaked and manipulated blue coloured fruits of Coprosma acerosa in a
binary test. This supports the idea of weta co- evolving with fruit colours of
certain divaricating plants in New Zealand. I suggest that the fruit colours of New
Zealand are shaped by the combined selection pressure from birds, lizards/geckos
and weta.
