Avian ecology and rapid morphological change in a novel plant-frugivore system
type: CreativeWork
description: Novel ecosystems are increasingly common, and the stability and functioning of novel ecosystems depends on the ability of species to fulfil functional roles such as seed dispersal. The morphology and foraging behavior of non-native species can influence their ability to fulfil functional roles; however, the relationship between form and function may change as they experience morphological change. My research aimed to describe the rapid morphological change of the main frugivorous birds on the Hawaiian Island of Oʻahu where all native frugivores have gone extinct. To understand how the morphological changes may influence the species’ ecology, I then related their foraging and movement behavior to their morphology. Lastly, I used point counts conducted across the island to describe the spatial heterogeneity of the bird community and then related that heterogeneity and species’ abundances to habitat and environmental variables. I found that on the Hawaiian Island of Oʻahu, the primary avian frugivores (all non-native) have experienced morphological divergence from their native ranges with the general trend of smaller body measurements and more robust bills on Oʻahu. Further, I found significant relationships between morphology and ecology across the four main frugivores, suggesting a link between their form and ecological function. However, I found that ecomorphological relationships did not apparently explain patterns of community structure and that spatial heterogeneity in communities was driven primarily by elevation and invasion level. Still, two of the main frugivorous bird species, Zosterops japonicus and Pycnonotus cafer did show habitat associations that coincided with their morphology being the species with the larger wing in relation to their tarsi and occupying open habitats. My results indicate that species with more distinct ecologies and morphologies are more likely to establish (i.e. ecological filtering) during the introduction process which conserves t…
abstract: Novel ecosystems are increasingly common, and the stability and functioning of novel ecosystems depends on the ability of species to fulfil functional roles such as seed dispersal. The morphology and foraging behavior of non-native species can influence their ability to fulfil functional roles; however, the relationship between form and function may change as they experience morphological change. My research aimed to describe the rapid morphological change of the main frugivorous birds on the Hawaiian Island of Oʻahu where all native frugivores have gone extinct. To understand how the morphological changes may influence the species’ ecology, I then related their foraging and movement behavior to their morphology. Lastly, I used point counts conducted across the island to describe the spatial heterogeneity of the bird community and then related that heterogeneity and species’ abundances to habitat and environmental variables. I found that on the Hawaiian Island of Oʻahu, the primary avian frugivores (all non-native) have experienced morphological divergence from their native ranges with the general trend of smaller body measurements and more robust bills on Oʻahu. Further, I found significant relationships between morphology and ecology across the four main frugivores, suggesting a link between their form and ecological function. However, I found that ecomorphological relationships did not apparently explain patterns of community structure and that spatial heterogeneity in communities was driven primarily by elevation and invasion level. Still, two of the main frugivorous bird species, Zosterops japonicus and Pycnonotus cafer did show habitat associations that coincided with their morphology being the species with the larger wing in relation to their tarsi and occupying open habitats. My results indicate that species with more distinct ecologies and morphologies are more likely to establish (i.e. ecological filtering) during the introduction process which conserves t…
author: Gleditsch, Jason M.
language: en
keywords: Rapid Evolution, Bird Ecology, Ecomorphology, Diversity Patterns, Oahu, Hawaii
date published: 2020-03-02T21:58:18Z
date modified: 2026-07-22T22:24:45Z
provider: University of Illinois - Urbana-Champaign
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Illinois at Urbana-Champaign

PropertyValue
property ID: Handle
value: http://hdl.handle.net/2142/106223