dc.contributor.author |
Tabak, Michael A.
|
|
dc.contributor.author |
Anderson, O.R.J. (Orea)
|
|
dc.contributor.author |
Robb, Gillian
|
|
dc.contributor.author |
Poncet, Sally
|
|
dc.contributor.author |
Passfield, Ken
|
|
dc.contributor.author |
Martinez, Melissa Gaste
|
|
dc.contributor.author |
Del Rio, Carlos Martinez
|
|
dc.date.accessioned |
2017-03-23T10:33:20Z |
|
dc.date.issued |
2016-09 |
|
dc.description.abstract |
While several studies have shown that invasive rats can have negative effects on island birds
through predation (both direct predation and nest predation), other mechanisms for the effects of
invasives on island biota have been given less attention. Here we explore another potential
mechanism by which invasive rats can affect native island birds: the competitive use of common
resources. We used stable isotope analyses to estimate the fraction of marine and terrestrial
sources incorporated into the tissues of two species of passerines (Troglodytes cobbi,
Troglodytidae; and Cinclodes antarcticus, Furnariidae) and Norway rats (Rattus norvegicus,
Muridae) in the Falkland Islands. These two passerines are absent on islands where rats are
present. We found significant incorporation of marine resources in the three species, with the
highest incorporation in tissues of T. cobbi. This species appears to be one of the passerines most
reliant on marine sources and the most marine member of the family Troglodytidae. We also
used the results of these isotopic analyses to estimate the isotopic niche breadth of each of these
species and the isotopic niche overlap among them. Rattus norvegicus had a large isotopic niche
that overlapped broadly with those of the two passerine species. We propose that different ways
of both depicting and estimating isotopic niche widths are complementary rather than alternative.
Our results are consistent with the notion that invasive rats might have an impact on these two
species of Falkland Island passerines by using common resources, but do not rule out the
possibility that part of their effect is through direct predation. |
en_ZA |
dc.description.department |
Zoology and Entomology |
en_ZA |
dc.description.embargo |
2017-10-31 |
|
dc.description.librarian |
hb2017 |
en_ZA |
dc.description.sponsorship |
MT and CMR were partially funded by National Science Foundation Grants # 0841298 and DIOS-0848028, respectively. SP and KP were funded by Antarctic Research Trust, UK Overseas Territories Environment Programme, Royal Society for Protection of Birds, Joint Nature Conservation Committee, and the Falkland Islands Government. |
en_ZA |
dc.description.uri |
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1442-9993 |
en_ZA |
dc.identifier.citation |
Tabak, MA, Anderson, ORJ, Robb, G, Poncet, S, Passfield, K, Martinez, MG & Del Rio, CM 2016, 'Comparative isotopic natural history of two native passerines (Troglodytes cobbi and Cinclodes antarcticus) and the invasive rats (Rattus norvegicus) that extirpate them', Austral Ecology, vol. 41, no. 6, pp. 622-632. |
en_ZA |
dc.identifier.issn |
1442-9985 (print) |
|
dc.identifier.issn |
1442-9993 (online) |
|
dc.identifier.other |
10.1111/aec.12351 |
|
dc.identifier.uri |
http://hdl.handle.net/2263/59510 |
|
dc.language.iso |
en |
en_ZA |
dc.publisher |
Wiley |
en_ZA |
dc.rights |
© 2016 Ecological Society of Australia. This is the pre-peer reviewed version of the following article : Comparative isotopic natural history of two native passerines (Troglodytes cobbi and Cinclodes antarcticus) and the invasive rats (Rattus norvegicus) that extirpate them, Austral Ecology, vol. 41, no. 6, pp. 622-632, 2016. doi : 10.1111/aec.12351. The definite version is available at : http://onlinelibrary.wiley.comjournal/10.1111/(ISSN)1442-9993. |
en_ZA |
dc.subject |
Competition |
en_ZA |
dc.subject |
Invasive species |
en_ZA |
dc.subject |
Marine passerine |
en_ZA |
dc.subject |
Niche breadth |
en_ZA |
dc.subject |
Niche overlap |
en_ZA |
dc.subject |
Stable isotopes |
en_ZA |
dc.title |
Comparative isotopic natural history of two native passerines (Troglodytes cobbi and Cinclodes antarcticus) and the invasive rats (Rattus norvegicus) that extirpate them |
en_ZA |
dc.type |
Postprint Article |
en_ZA |