Skip navigation
Skip navigation

Lack of fire and insect herbivory constrain recruitment in a rare legume from Western Australia

Cochrane, Anne; Monks, Leonie

Description

We investigated factors influencing recruitment in the rare endemic shrub Acacia insolita subsp. recurva (Fabaceae) from the heavily cleared south‐west of Western Australia. We examined annual seed production over 4 years, including the impact of herbivory on reproductive output. Conversion of bud to fruit was low (overall 0.02%). The lack of significant difference in canopy dimensions between caged and uncaged plants suggested that vertebrate herbivore grazing was negligible, but invertebrate...[Show more]

dc.contributor.authorCochrane, Anne
dc.contributor.authorMonks, Leonie
dc.date.accessioned2020-12-02T00:52:56Z
dc.identifier.issn1442-9985
dc.identifier.urihttp://hdl.handle.net/1885/216643
dc.description.abstractWe investigated factors influencing recruitment in the rare endemic shrub Acacia insolita subsp. recurva (Fabaceae) from the heavily cleared south‐west of Western Australia. We examined annual seed production over 4 years, including the impact of herbivory on reproductive output. Conversion of bud to fruit was low (overall 0.02%). The lack of significant difference in canopy dimensions between caged and uncaged plants suggested that vertebrate herbivore grazing was negligible, but invertebrate predation had a negative impact on seed production (loss of >80% of fruiting potential). Soil cores determined the presence of soil‐stored seeds and an experimental burn confirmed that plants are fire‐killed and can regenerate from the seed bank. This seed reserve was found to contain <5 seeds m−2, and both freshly collected seeds and seeds retrieved from the soil had high viability (99% vs . 91%) when subjected to a germination test. Seedling recruitment 29 months post‐fire resulted in a ratio of three seedlings for every adult killed by fire. We also compared reproductive success in this rare Acacia with its common conspecific and although the rare species produced more flowers, the success of flowering did not translate into better fruit set. We conclude that insect damage to reproductive branchlets and lack of appropriate disturbance are major factors constraining recruitment. Active site management may be required for the continued persistence of this fire‐dependent legume.
dc.description.sponsorshipThis study was undertaken with support from the Natural Heritage Trust Endangered Species Program Grant ESU 00006465.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherBlackwell Science Asia
dc.rights© 2019 Ecological Society of Australia
dc.sourceAustral Ecology
dc.subjectAcacia
dc.subjectconservation biology
dc.subjectdemographics
dc.subjectfire
dc.subjectrare
dc.subjectrecruitment
dc.subjectsoil seed reserve
dc.titleLack of fire and insect herbivory constrain recruitment in a rare legume from Western Australia
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume44
dc.date.issued2019
local.identifier.absfor060208 - Terrestrial Ecology
local.identifier.absfor060207 - Population Ecology
local.identifier.ariespublicationu3102795xPUB5329
local.publisher.urlhttps://www.wiley.com/en-gb
local.type.statusPublished Version
local.contributor.affiliationCochrane, Jennifer, College of Science, ANU
local.contributor.affiliationMonks, Leonie, Bentley Delivery Centre
local.description.embargo2037-12-31
local.bibliographicCitation.issue7
local.bibliographicCitation.startpage1245
local.bibliographicCitation.lastpage1255
local.identifier.doi10.1111/aec.12802
local.identifier.absseo970106 - Expanding Knowledge in the Biological Sciences
dc.date.updated2020-07-19T08:29:43Z
local.identifier.scopusID2-s2.0-85068688515
CollectionsANU Research Publications

Download

File Description SizeFormat Image
01_Cochrane_Lack_of_fire_and_insect_2019.pdf386.03 kBAdobe PDF    Request a copy


Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.

Updated:  19 May 2020/ Responsible Officer:  University Librarian/ Page Contact:  Library Systems & Web Coordinator