Seed rain of Microlaena stipoides

Meredith Mitchell, James Virgona, Joe Jacobs, David Kemp

Research output: Book chapter/Published conference paperConference paper

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Abstract

Microlaena stipoides (Microlaena) is a native grass that is recognised as being of increasing importance in natural grazing systems in south-eastern Australia. Critical to its wider use is understanding how it spreads, particularly through seed production as the precursor to seedling recruitment. Pitfall funnel seed traps were used to measure reproductive potential of a vegetation community via seed rain. The abundance and weight of Microlaena seed in the seed rain of a grazed native grass pasture was measured over nine months (November 2010 to July 2011) at Chiltern, north-east Victoria. During the period of the experiment 544 mm of rainfall was received, above average summer rainfall. The primary dispersal method for Microlaena seed is by gravity. Within six dense swards of Microlaena nine seed rain traps were established. The traps were set out in a 3 x 3 pattern with a spacing of 0.4 m between trap centres. Phenological growth stage of the Microlaena was recorded. Over the measurement period a total of 265 seeds were collected; equivalent to 23 kg seed/ha. The peak period of seed production, in terms of both weight and number, was from late December to early January. The average seed germination of 60% was recorded 17 weeks after collection. These low seed yields, combined with climate and competitive risks suggest that few seedlings are likely to establish and persist as plants in any one year. Used in conjunction with other monitoring methods, these results offer a valuable insight about the dynamics of an individual species, and can contribute to the development of appropriate management strategies to maintain populations of Microlaena within grazed pastures.
Original languageEnglish
Title of host publication16th AAC
Subtitle of host publicationCapturing opportunities and overcoming obstacles in Australian agronomy
EditorsI. Yunusa
Place of PublicationAustralia
PublisherRegional Institute
Pages1-5
Number of pages5
Publication statusPublished - 2012
EventAustralian Agronomy Conference - University of New England, Armidale, Australia
Duration: 14 Oct 201218 Oct 2012
Conference number: 16th
http://agronomyaustraliaproceedings.org/index.php/2012-conf-proc-homepage (Conference proceedings 2012 homepage)

Publication series

Name
ISSN (Print)0815-3779

Conference

ConferenceAustralian Agronomy Conference
Abbreviated titleCapturing Opportunities and Overcoming Obstacles in Australian Agronomy
CountryAustralia
CityArmidale
Period14/10/1218/10/12
Internet address

Fingerprint

Microlaena stipoides
Microlaena
rain
seeds
traps
seed productivity
Victoria (Australia)
pastures
grasses
sward
gravity
seed yield
seed germination
spatial distribution
developmental stages
grazing

Cite this

Mitchell, M., Virgona, J., Jacobs, J., & Kemp, D. (2012). Seed rain of Microlaena stipoides. In I. Yunusa (Ed.), 16th AAC: Capturing opportunities and overcoming obstacles in Australian agronomy (pp. 1-5). Australia: Regional Institute.
Mitchell, Meredith ; Virgona, James ; Jacobs, Joe ; Kemp, David. / Seed rain of Microlaena stipoides. 16th AAC: Capturing opportunities and overcoming obstacles in Australian agronomy. editor / I. Yunusa. Australia : Regional Institute, 2012. pp. 1-5
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abstract = "Microlaena stipoides (Microlaena) is a native grass that is recognised as being of increasing importance in natural grazing systems in south-eastern Australia. Critical to its wider use is understanding how it spreads, particularly through seed production as the precursor to seedling recruitment. Pitfall funnel seed traps were used to measure reproductive potential of a vegetation community via seed rain. The abundance and weight of Microlaena seed in the seed rain of a grazed native grass pasture was measured over nine months (November 2010 to July 2011) at Chiltern, north-east Victoria. During the period of the experiment 544 mm of rainfall was received, above average summer rainfall. The primary dispersal method for Microlaena seed is by gravity. Within six dense swards of Microlaena nine seed rain traps were established. The traps were set out in a 3 x 3 pattern with a spacing of 0.4 m between trap centres. Phenological growth stage of the Microlaena was recorded. Over the measurement period a total of 265 seeds were collected; equivalent to 23 kg seed/ha. The peak period of seed production, in terms of both weight and number, was from late December to early January. The average seed germination of 60{\%} was recorded 17 weeks after collection. These low seed yields, combined with climate and competitive risks suggest that few seedlings are likely to establish and persist as plants in any one year. Used in conjunction with other monitoring methods, these results offer a valuable insight about the dynamics of an individual species, and can contribute to the development of appropriate management strategies to maintain populations of Microlaena within grazed pastures.",
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Mitchell, M, Virgona, J, Jacobs, J & Kemp, D 2012, Seed rain of Microlaena stipoides. in I Yunusa (ed.), 16th AAC: Capturing opportunities and overcoming obstacles in Australian agronomy. Regional Institute, Australia, pp. 1-5, Australian Agronomy Conference, Armidale, Australia, 14/10/12.

Seed rain of Microlaena stipoides. / Mitchell, Meredith; Virgona, James; Jacobs, Joe; Kemp, David.

16th AAC: Capturing opportunities and overcoming obstacles in Australian agronomy. ed. / I. Yunusa. Australia : Regional Institute, 2012. p. 1-5.

Research output: Book chapter/Published conference paperConference paper

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T1 - Seed rain of Microlaena stipoides

AU - Mitchell, Meredith

AU - Virgona, James

AU - Jacobs, Joe

AU - Kemp, David

N1 - Imported on 03 May 2017 - DigiTool details were: publisher = Australia: Regional Institute, 2012. editor/s (773b) = I Yunusa; Event dates (773o) = 14-18 October 2012; Parent title (773t) = Australian Agronomy Conference. ISSNs: 0815-3779;

PY - 2012

Y1 - 2012

N2 - Microlaena stipoides (Microlaena) is a native grass that is recognised as being of increasing importance in natural grazing systems in south-eastern Australia. Critical to its wider use is understanding how it spreads, particularly through seed production as the precursor to seedling recruitment. Pitfall funnel seed traps were used to measure reproductive potential of a vegetation community via seed rain. The abundance and weight of Microlaena seed in the seed rain of a grazed native grass pasture was measured over nine months (November 2010 to July 2011) at Chiltern, north-east Victoria. During the period of the experiment 544 mm of rainfall was received, above average summer rainfall. The primary dispersal method for Microlaena seed is by gravity. Within six dense swards of Microlaena nine seed rain traps were established. The traps were set out in a 3 x 3 pattern with a spacing of 0.4 m between trap centres. Phenological growth stage of the Microlaena was recorded. Over the measurement period a total of 265 seeds were collected; equivalent to 23 kg seed/ha. The peak period of seed production, in terms of both weight and number, was from late December to early January. The average seed germination of 60% was recorded 17 weeks after collection. These low seed yields, combined with climate and competitive risks suggest that few seedlings are likely to establish and persist as plants in any one year. Used in conjunction with other monitoring methods, these results offer a valuable insight about the dynamics of an individual species, and can contribute to the development of appropriate management strategies to maintain populations of Microlaena within grazed pastures.

AB - Microlaena stipoides (Microlaena) is a native grass that is recognised as being of increasing importance in natural grazing systems in south-eastern Australia. Critical to its wider use is understanding how it spreads, particularly through seed production as the precursor to seedling recruitment. Pitfall funnel seed traps were used to measure reproductive potential of a vegetation community via seed rain. The abundance and weight of Microlaena seed in the seed rain of a grazed native grass pasture was measured over nine months (November 2010 to July 2011) at Chiltern, north-east Victoria. During the period of the experiment 544 mm of rainfall was received, above average summer rainfall. The primary dispersal method for Microlaena seed is by gravity. Within six dense swards of Microlaena nine seed rain traps were established. The traps were set out in a 3 x 3 pattern with a spacing of 0.4 m between trap centres. Phenological growth stage of the Microlaena was recorded. Over the measurement period a total of 265 seeds were collected; equivalent to 23 kg seed/ha. The peak period of seed production, in terms of both weight and number, was from late December to early January. The average seed germination of 60% was recorded 17 weeks after collection. These low seed yields, combined with climate and competitive risks suggest that few seedlings are likely to establish and persist as plants in any one year. Used in conjunction with other monitoring methods, these results offer a valuable insight about the dynamics of an individual species, and can contribute to the development of appropriate management strategies to maintain populations of Microlaena within grazed pastures.

KW - Open access version available

KW - Native grass

KW - Native pasture

KW - Seed rain

KW - Weeping grass

M3 - Conference paper

SP - 1

EP - 5

BT - 16th AAC

A2 - Yunusa, I.

PB - Regional Institute

CY - Australia

ER -

Mitchell M, Virgona J, Jacobs J, Kemp D. Seed rain of Microlaena stipoides. In Yunusa I, editor, 16th AAC: Capturing opportunities and overcoming obstacles in Australian agronomy. Australia: Regional Institute. 2012. p. 1-5