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- W7967892 abstract "The ecologically sensitive, but relatively simple sub-Antarctic mouse-colonised Marion and mouse-free Prince Edward Islands represent ideal ecosystems for addressing questions relating to the partitioning of potential influences of anthropogenic changes, such as climate change and alien species on ecosystem functioning. Consequently, weevil species were used in the present investigation to address questions of morphological change over time with reference to climate change and mouse predation. As a prelude to the assessment of morphological changes over time, the six currently recognised weevil species, namely, Bothrometopus randi, B. parvulus, B. elongatus, Ectemnorhinus similis, E. marioni and Palirhoeus eatoni from both Marion and Prince Edward Islands were confirmed by morphometric analyses. However, the taxonomic status of Ectemnorhinus weevil species on both islands is much more complex than previously considered. A multi-faceted approach based on both morphometric and molecular (COI gene) data suggest the presence of a single species, comprising diverse, genetically discrete populations on Marion Island and two genetically distinct species on Prince Edward Island. The assessment of morphological changes over time included the four remaining weevil species (B. elongatus, B. randi, B. parvulus and P. eatoni) occurring on both Marion and Prince Edward Islands, collected non-consecutively over five decades. These analyses suggest morphometric size differences between samples from both Marion and Prince Edward Islands collected in the mid-1960s and 1970s and those collected recently. Similarly, samples from both islands collected in the earlyto mid-1980s also showed morphometric shape differences with those collected recently for both Prince Edward and Marion Islands, respectively. Generalized Linear Models (GLZ) suggested year of sampling to contribute more, to both, University of Pretoria etd – Janse van Rensburg, L (2006)" @default.
- W7967892 created "2016-06-24" @default.
- W7967892 creator A5027058450 @default.
- W7967892 date "2006-05-02" @default.
- W7967892 modified "2023-09-23" @default.
- W7967892 title "A morphological analysis of weevils from sub-Antarctic Prince Edward Islands: an assessment of ecological influences" @default.
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