Mind the gap – context dependency in invasive species impacts : a case study of the ascidian Ciona robusta

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dc.contributor.authorRobinson, Tamara B.en_ZA
dc.contributor.authorHavenga, Brendanen_ZA
dc.contributor.authorVan der Merwe, Marleneen_ZA
dc.contributor.authorJackson, Sueen_ZA
dc.contributor.editorRuiz, Gregoryen_ZA
dc.date.accessioned2019-02-19T14:15:46Z
dc.date.available2019-02-19T14:15:46Z
dc.date.issued2017-01-04
dc.descriptionCITATION: Robinson, T. B., et al. 2017. Mind the gap – context dependency in invasive species impacts : a case study of the ascidian Ciona robusta. NeoBiota, 32:127-141, doi:10.3897/neobiota.32.9373.en_ZA
dc.descriptionThe original publication is available at https://neobiota.pensoft.neten_ZA
dc.description.abstractENGLISH ABSTRACT: In the face of increasing invasions and limited resources, appropriate management of invasive species requires prioritisation of species for management action. This process often relies on knowledge of species specific impacts. However, as studies explicitly measuring impact of marine alien species are rare, prioritisation of management actions is often based on studies from outside the geographic area of interest. Further, few impact studies account for context dependency (e.g. seasonal variability or distinct environmental regimes), raising the question of how transferrable knowledge about the impact of a species is between invaded ranges. This study addressed this question by using the widespread invasive solitary ascidian Ciona robusta as a case study for assessing impacts across two invaded regions: South Africa and California, USA. We replicated a previously conducted experiment from California that showed that C. robusta depresses local species richness in San Francisco Bay. Our South African experiment showed no effect of C. robusta on species richness, the Shannon-Weiner diversity index or community composition, despite experiments being carried out over two years and at two depths. While these results may reflect strong density dependency in the impact of C. robusta, they serve to highlight context dependency in invasive species impacts. This suggests that until studies of impact in marine systems become common place, context dependency should be explicitly addressed as a source of uncertainty during the prioritisation of species for management action.en_ZA
dc.description.urihttps://neobiota.pensoft.net/article/9373/
dc.description.versionPublisher's versionen_ZA
dc.format.extent15 pages : illustrations, mapen_ZA
dc.identifier.citationRobinson, T. B., et al. 2017. Mind the gap – context dependency in invasive species impacts : a case study of the ascidian Ciona robusta. NeoBiota, 32:127-141, doi:10.3897/neobiota.32.9373en_ZA
dc.identifier.issn1314-2488 (online)
dc.identifier.issn1619-0033 (print)
dc.identifier.otherdoi:10.3897/neobiota.32.9373
dc.identifier.urihttp://hdl.handle.net/10019.1/105440
dc.language.isoen_ZAen_ZA
dc.publisherPensoft Publishersen_ZA
dc.rights.holderAuthors retain copyrighten_ZA
dc.subjectInvasive species -- Managementen_ZA
dc.subjectCiona robustaen_ZA
dc.subjectBiological invasionsen_ZA
dc.subjectPrioritisation of speciesen_ZA
dc.titleMind the gap – context dependency in invasive species impacts : a case study of the ascidian Ciona robustaen_ZA
dc.typeArticleen_ZA
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