Passage and survival of Acaciella angustissima (Mill.) Britton & Rose and Aeschynomene paniculata Willd. ex Vogel seed through the sheep gut

Gardiner, Chris, Cox, Kendrick, Wright, Carole, and Keating, Mark (2010) Passage and survival of Acaciella angustissima (Mill.) Britton & Rose and Aeschynomene paniculata Willd. ex Vogel seed through the sheep gut. In: Proceedings of the 17th Australasian Weeds Conference, pp. 418-420. From: 17th Australasian Weeds Conference, 26 - 30 September 2010, Christchurch, New Zealand.

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Abstract

Acaciella angustissima (syn. Acacia angustissima) (white ball acacia) and Aeschynomene paniculata Willd. ex Vogel (pannicle joint vetch), were rejected for release after their identification as potential weeds in pasture evaluation trials. These plants are now targeted for control and, where possible, eradication from old experimental sites across Queensland. It is suspected that domestic livestock, feral and native animals contribute to the movement of these seeds through the ingestion and defecation of viable seeds across the landscape. This aspect was explored by feeding the intact seeds of these two species to sheep in metabolism cages. Sheep faeces were collected each day for 5 days after which time the faeces were sieved and the surviving intact seeds were then collected, counted and germination tests undertaken. The results show that seeds of both species pass through sheep with most seeds being passed after 48 h with a percentage of these seeds being viable. Of the number of seeds fed, 4.25% were recovered for A. angustissima and 1.4% for A. paniculata. Seed recovered from the faeces had 0% and 13% germination for A. angustissima and A. paniculata respectively, but with additional post-digestion hot water scarification germination increased to 75% and 33% for A. angustissima and A. paniculata respectively. This paper discusses these results and the implications for the possible spread of these species across the northern Australian landscape.

Item ID: 14851
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: weed seeds; hardseeds; legumes; digestion
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ISBN: 978-0-86476-239-9
Date Deposited: 18 May 2011 02:22
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds) @ 100%
SEO Codes: 96 ENVIRONMENT > 9604 Control of Pests, Diseases and Exotic Species > 960410 Control of Pests, Diseases and Exotic Species in Sparseland, Permanent Grassland and Arid Zone Environments @ 100%
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