Showing items 1 - 5 of 5

Littoral macroinvertebrates in relation to native and exotic riparian vegetation in streams of central Victoria, Australia

- Jayawardana, Chandamali

  • Authors: Jayawardana, Chandamali
  • Date: 2006
  • Type: Text , Thesis , PhD
  • Full Text: false
  • Description: "Exotic willows (Salix spp.) are widespread riparian tree species of streams in temperate Australian and New Zealand. In Australian willow species are declared weeds of national significance, yet little is known about the novel habitats they create not the impact on aquatic biota of vegetation change following willow management programs ..." [leaf i]
  • Description: Doctor of Philosophy
  • Description: "Exotic willows (Salix spp.) are widespread riparian tree species of streams in temperate Australian and New Zealand. In Australian willow speicies are declared weeds of national significance, yet little is known about the novel habitats they create not the impact on aquatic biota of vegetation change following willow management programs ..." [leaf i]

Littoral macroinvertebrates in relation to native and exotic riparian vegetation in streams of central victoria, Australia

- Jayawardana, Chandamali

  • Authors: Jayawardana, Chandamali
  • Date: 2011
  • Type: Text , Journal article
  • Relation: International Journal of Energy, Environment and Economics Vol. 19, no. 6 (2011), p. 635-651
  • Full Text: false
  • Reviewed:
  • Description: Exotic willows (Salix spp.) are widespread riparian tree species of rivers in temperate Australia and New Zealand. Willow removal is an integral part in riparian management of rivers in temperate Australia. Reeds (Phagmites australis) and shrubs (Leptospermum spp. and Callistemon spp.) are common vegetation in the riparian zone of Victorian streams and considered suitable for planting along channels in revegetation programmes following willow removal. Little is known about the novel habitats created by willows and the impact on aquatic biota of vegetation successional process following willow management programmes. Macroinvertebrate fauna in willow, Phragmites australis, Leptospermum/ Callistemon and bare bank habitats were examined in three central Victorian streams in Australia to understand the effect of such littoral habitats on macroinvertebrates taxa richness, abundance and community composition. Data were analysed using a two way ANOVA with habitat and season as main effects. Habitats had a significant effect (p<0.05) on macroinvertebrate taxa richness. Willow and Phragmites habitats generally contained more taxa and total number of individuals than Leptospermum/ Callistemon or bare bank habitats though the absolute rank order of habitats differed among seasons. In Phragmites habitats species richness was higher during winter and spring. In willow habitats it was higher during spring and autumn and in Leptospermum/ Callistemon habitats during summer. Multivariate analysis showed that community composition within the habitats was significantly different, with willow and Phragmites separating from Leptospermum/ Callistemon and bare bank habitats in seasons with high flow. It appears that a vegetation transition from willows to bare banks or shrubs alone would be potentially more disruptive to macroinvertebrate communities than a transition from willows to a combination of littoral reeds and native riparian vegetation. This result suggests that exploration of techniques to guide a transition from willow to native littoral and riparian vegetation without a disruptive clearing phase is therefore desirable. © 2011 Nova Science Publishers, Inc.

Macroinvertebrate communities in Phragmites australis (Cav.) Trin. ex Steud. reed beds and open bank habitats in central Victorian streams in Australia

- Jayawardana, Chandamali, Westbrooke, Martin, Wilson, Michael, Hurst, Cameron

  • Authors: Jayawardana, Chandamali , Westbrooke, Martin , Wilson, Michael , Hurst, Cameron
  • Date: 2006
  • Type: Text , Journal article
  • Relation: Hydrobiologia Vol. 568, no. 1 (2006), p. 169-185
  • Full Text: false
  • Reviewed:
  • Description: Reed invasion is a common phenomenon of open streams with disturbed riparian vegetation in river catchments. Knowledge of the effects of such vegetation change on aquatic communities is fundamental to river management. Macroinvertebrate fauna in Phragmites australis (Cav.) Trin. ex Steud. and open bank habitats were examined in three rivers in central Victoria in order to understand the effect of such littoral habitat on macroinvertebrates. Data were analysed using Partially Nested Factorial ANOVA with season, river and habitats as main effects. Habitat structure had a significant effect (p < 0.05) on macroinvertebrate species richness, however this was not seasonally consistent across the three rivers. There was a significant increase (p < 0.05) in macroinvertebrate taxa richness in Phragmites habitats during winter and spring seasons. Total abundance of taxa showed no consistent significant differences in the two habitats. Results of Canonical Analysis of Principle Coordinates indicated significant differences (p < 0.05) in macroinvertebrate assemblages between Phragmites and bare bank habitats in all seasons. Habitat selection by taxa could be related to the microphysical environment of the habitats. This study suggests that reed beds create important littoral habitat structures which support diverse macroinvertebrate assemblages. © Springer 2006.
  • Description: C1
  • Description: 2003001589

Macroinvertebrate communities in willow (Salix spp.) and reed beds (Phragmites australis) in central Victorian streams in Australia

- Jayawardana, Chandamali, Westbrooke, Martin, Wilson, Michael, Hurst, Cameron

  • Authors: Jayawardana, Chandamali , Westbrooke, Martin , Wilson, Michael , Hurst, Cameron
  • Date: 2006
  • Type: Text , Journal article
  • Relation: Marine and Freshwater Research Vol. 57, no. 4 (2006), p. 429-439
  • Full Text: false
  • Reviewed:
  • Description: Exotic willows (Salix spp.) are widespread riparian tree species of rivers in temperate Australia and New Zealand. Despite being considered as a weed of national significance, little is known about the habitat value of willows and the impact on aquatic biota of vegetation change following willow management programmes. Macroinvertebrate fauna in root habitats of willows and Phragmites australis habitats were examined in three central Victorian rivers to understand the effect of such littoral habitat changes on macroinvertebrates. Data were analysed using Partially Nested Factorial ANOVA with season, river and habitat as main effects. Habitat structure had a significant effect (P < 0.05) on macroinvertebrate community assemblage. However, effect of habitat was not consistent among seasons. The greatest community differences among habitats were observed during winter and least separation during autumn. Taxa responsible for community differences among habitats were also identified. Species richness and abundance did not show consistent variation among habitats over different rivers or seasons. This study provided some indication of the macroinvertebrate community changes that would take place in situations where riparian vegetation changes takes place from willows to P. australis. © CSIRO 2006.
  • Description: C1
  • Description: 2003001620

Potential effects of riparian vegetation changes on functional organisation of macroinvertebrates in central Victorian streams

- Jayawardana, Chandamali, Westbrooke, Martin

  • Authors: Jayawardana, Chandamali , Westbrooke, Martin
  • Date: 2010
  • Type: Text , Journal article
  • Relation: Victorian Naturalist Vol. 127, no. 2 (2010), p. 36-46
  • Full Text: false
  • Reviewed:
  • Description: Exotic willows (Salix spp.) are widespread riparian tree species of rivers in temperate Australia and New Zealand. Despite being a Weed of National Significance, little is known about the novel habitats created by willows and the impact on aquatic biota of vegetation change following willow management programs. Reeds (Phragmites australis) and shrubs (Leptospermum spp. znaCallistemon spp.) are common taxa in the riparian zone of Victorian streams and are considered suitable for planting along channels in revegetation programs following willow removal. Categorisation of macroinvertebrates into 'trophic' groups allows better understanding of the processes of energy flow, material cycle and stream ecosystem function. Macroinvertebrate functional feeding groups associated with willow, Phragmites australis, Leptospermum/CaUistemon and bare bank habitats were examined in three central Victorian streams to gain insights to potential effects of willow removal on functional organisation of macroinvertebrates. There was a significant effect of habitat on macroinvertebrate functional feeding groups except collectors. Notable differences in functional feeding groups included a greater abundance ofpredators and grazers in Phragmites habitats and a greater abundance of snredders in willow habitats; however, these changes were variable during different seasons. It appears riparian vegetation change associated with willow management could bring about change of functional organisation of macroinvertebrates in these streams. This suggests that the vegetation changes can bring about changes in material cycle and energy flow within these streams.
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