dc.contributor.author |
Weldon, Christopher William
|
|
dc.contributor.author |
Nyamukondiwa, Casper
|
|
dc.contributor.author |
Karsten, Minette
|
|
dc.contributor.author |
Chown, Steven L.
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|
dc.contributor.author |
Terblanche, John S.
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|
dc.date.accessioned |
2018-09-20T06:13:14Z |
|
dc.date.available |
2018-09-20T06:13:14Z |
|
dc.date.issued |
2018-06-29 |
|
dc.description.abstract |
Traits of thermal sensitivity or performance are typically the focus of species distribution modelling. Among-population trait variation, trait plasticity, population connectedness and the possible climatic covariation thereof are seldom accounted for. Here, we examine multiple climate stress resistance traits, and the plasticity thereof, for a globally invasive agricultural pest insect, the Mediterranean fruit fly, Ceratitis capitata (Wiedemann) (Diptera: Tephritidae). We also accounted for body size and population genetic connectivity among distinct populations from diverse bioclimatic regions across southern Africa. Desiccation resistance, starvation resistance, and critical thermal minimum (CTmin) and maximum (CTmax) of C. capitata varied between populations. For thermal tolerance traits, patterns of flexibility in response to thermal acclimation were suggestive of beneficial acclimation, but this was not the case for desiccation or starvation resistance. Population differences in measured traits were larger than those associated with acclimation, even though gene flow was high. Desiccation resistance was weakly but positively affected by growing degree-days. There was also a weak positive relationship between CTmin and temperature seasonality, but CTmax was weakly but negatively affected by the same bioclimatic variable. Our results suggest that the invasive potential of C. capitata may be supported by adaptation of tolerance traits to local bioclimatic conditions. |
en_ZA |
dc.description.department |
Zoology and Entomology |
en_ZA |
dc.description.librarian |
am2018 |
en_ZA |
dc.description.sponsorship |
Some fly populations were collected and provided for study by Aruna Manrakhan (Citrus Research International,
South Africa), and Sunday Ekesi (icipe, Kenya). We thank Juanita Liebenberg for fly rearing and maintenance
of cultures in the laboratory and Matthew Hill for extracting bioclimatic characters for sampled sites from the
database compiled by Metzger et al. (2013). We are also grateful for the assistance of Bernard Coetzee, Jennifer
Lee, Katherine Mitchell, Erika Nortje, and Anne Treasure with desiccation resistance assays, and Jean Saayman
with the extraction of lipids and determination of lipid-free dry mass. C.W.W. was supported by a DST-NRF
Centre for Invasion Biology Postdoctoral Research Fellowship bursary and a University of Pretoria Research
Development Programme grant. J.S.T., M.K. and C.N. were supported by HortGro and NRF funding to J.S.T. |
en_ZA |
dc.description.uri |
http://www.nature.com/srep |
en_ZA |
dc.identifier.citation |
Weldon, C.W., Nyamukondiwa, C., Karsten, M. et al. 2018, 'Geographic variation and plasticity in climate stress resistance among southern African populations of Ceratitis capitata (Wiedemann) (Diptera : Tephritidae)', Scientific Reports, vol. 8, art. 9849, pp. 1-13. |
en_ZA |
dc.identifier.issn |
2045-2322 (online) |
|
dc.identifier.other |
10.1038/s41598-018-28259-3 |
|
dc.identifier.uri |
http://hdl.handle.net/2263/66597 |
|
dc.language.iso |
en |
en_ZA |
dc.publisher |
Nature Publishing Group |
en_ZA |
dc.rights |
© 2018 [Author et al] This is an open-access article distributed underthe terms of the Creative Commons Attribution License 4.0. |
en_ZA |
dc.subject |
Traits |
en_ZA |
dc.subject |
Climate stress |
en_ZA |
dc.subject |
Insect |
en_ZA |
dc.subject |
Desiccation resistance |
en_ZA |
dc.subject |
Africa |
en_ZA |
dc.subject |
Agricultural pest |
en_ZA |
dc.subject |
Body size |
en_ZA |
dc.subject |
Drought |
en_ZA |
dc.subject |
Gene flow |
en_ZA |
dc.subject |
Heat tolerance |
en_ZA |
dc.subject |
Mediterranean fruit fly |
en_ZA |
dc.subject |
Plasticity |
en_ZA |
dc.subject |
Seasonal variation |
en_ZA |
dc.subject |
South Africa (SA) |
en_ZA |
dc.subject |
Starvation |
en_ZA |
dc.title |
Geographic variation and plasticity in climate stress resistance among southern African populations of Ceratitis capitata (Wiedemann) (Diptera : Tephritidae) |
en_ZA |
dc.type |
Article |
en_ZA |