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<title>UTas ePrints - Effects of simulated green turtle regrazing on seagrass abundance, growth and nutritional status in Moreton Bay, south-east Queensland, Australia</title>
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<meta content="Kuiper-Linley, Marianne" name="eprints.creators_name" />
<meta content="Johnson, Craig R." name="eprints.creators_name" />
<meta content="Lanyon, Janet M." name="eprints.creators_name" />
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<meta content="Craig.Johnson@utas.edu.au" name="eprints.creators_id" />
<meta content="j.lanyon@uq.edu.au" name="eprints.creators_id" />
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<meta content="2007-05-31" name="eprints.datestamp" />
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<meta content="Effects of simulated green turtle regrazing on seagrass abundance, growth and nutritional status in Moreton Bay, south-east Queensland, Australia" name="eprints.title" />
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<meta content="Chelonia mydas, disturbance, green turtle, regrazing, seagrass" name="eprints.keywords" />
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<meta content="In some parts of their range, green turtles maintain grazing plots in seagrass beds by regular regrazing.
The effects of simulated repeated grazing on subtropical seagrasses in Moreton Bay, Australia were investigated in
a manipulative experiment over summer. Three seagrass species were subjected to two different clipping frequencies
(simulating turtle cropping) and compared with unclipped controls over a 3.5-month summer period for the effects on
seagrass biomass, leaf size and regrowth rates and water-soluble carbohydrate (WSC) and starch content. The order of
the seagrass species' relative tolerance to simulated grazing was Halophila ovalis>Zostera capricorni>Cymodocea
serrulata. Frequent regrazing of the green turtle's preferred seagrass, H. ovalis, resulted in an increase in leaf regrowth
rate so that standing biomass of leaves and total plant material was maintained, suggesting an increase in productivity.
Furthermore, whole-plant concentrations of WSC increased significantly in clipped H. ovalis plants relative to unclipped
controls. In contrast, leaf biomass of the seagrass species less preferred by turtles, Z. capricorni and C. serrulata, decreased
in response to repeated leaf removal relative to controls, despite maintenance of leaf regrowth rates. C. serrulata responded
to repeated clipping with a reduction in leaf size and a decrease in rhizomeWSCconcentration. Z. capricorni also produced
fewer and smaller newleaves.The ability of the preferred species, H. ovalis, to increase production of nutrient-rich standing
crop in response to regrazing has major implications for green turtles and other seagrass grazers.
" name="eprints.abstract" />
<meta content="2007-05" name="eprints.date" />
<meta content="published" name="eprints.date_type" />
<meta content="Marine and Freshwater Research" name="eprints.publication" />
<meta content="58" name="eprints.volume" />
<meta content="5" name="eprints.number" />
<meta content="492-503" name="eprints.pagerange" />
<meta content="10.1071/MF06241" name="eprints.id_number" />
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<meta content="Aragones, L. (1996). Dugongs and green turtles: grazers in the tropical
seagrass ecosystem. Ph.D. Thesis, James Cook University, Townsville.
Aragones, L., and Marsh, H. (2000). Impact of dugong grazing and turtle
cropping on tropical seagrass communities. Pacific Conservation
Biology 5, 277-288.
Bell, J.D., and Westoby, M. (1986). Importance of local changes in leaf height
and density to fish and decapods associated with seagrasses. Journal of
Experimental Marine Biology and Ecology 104, 249-274. doi:10.1016/
0022-0981(86)90109-7
Bjorndal, K. A. (1980). Nutrition and grazing behaviour of the green
turtle Chelonia mydas. Marine Biology 56, 147-154. doi:10.1007/
BF00397131
Bjorndal, K. A. (1985). Nutritional ecology of sea turtles. Copeia 1985,
736-751. doi:10.2307/1444767
Boon, P. I., Moriarty, D. J.W., and Saffigna, P. S. (1986). Nitrate metabolism
in sediments from seagrass (Zostera capricorni) beds of Moreton Bay,
Australia. Marine Biology 91, 269-275. doi:10.1007/BF00569443
Brand, S. J. (1995). Diet selection by juvenile green turtles Chelonia mydas,
in subtropical Flathead Gutter, Moreton Bay. Honours Thesis, Zoology
Department, The University of Queensland, Brisbane.
Brand-Gardner, S. J., Lanyon, J. M., and Limpus, C. J. (1999). Diet selection
by immature green turtles Chelonia mydas, in sub-tropical Moreton
Bay, south-east Queensland.Australian Journal of Zoology 47, 181-191.
doi:10.1071/ZO98065
Buchsbaum, R., and Valiela, I. (1987). Variability in the chemistry of estuarine
plants and its effect on feeding by Canada geese. Oecologia 73,
146-153. doi:10.1007/BF00376991
Clarke, S. M., and Kirkman, H. (1989). Seagrass dynamics. In 'Biology of
Seagrasses'. (Eds A.W. D. Larkum, A. J. McComb and S. A. Shepherd.)
pp. 304-305. (Elsevier: Amsterdam.)
Coles, R. G., Poiner, I. R., and Kirkman, H. (1989). Regional studies -
seagrasses of north-eastern Australia. In 'Biology of Seagrasses.' (Eds
A. W. D. Larkum, A. J. McComb and S. A. Shepherd.) pp. 261-278.
(Elsevier: Amsterdam.)
Dawes, C. J., and Lawrence, J. M. (1983). Proximate composition and caloric
content of seagrasses. Marine Technology Society Journal 17, 53-58.
Dawes, C. J., Bird, K., Durako, M., Goddard, R., Hoffman, W., and
McIntosh, R. (1979). Chemical fluctuations due to seasonal and cropping
effects on an algal-seagrass community. Aquatic Botany 6, 79-86.
doi:10.1016/0304-3770(79)90052-4
Dawes, C. J., Chann, M., Chinn, R., Koch, E. W., Lazar, A., and
Tomasko, D. (1987). Proximate composition, photosynthetic and respiratory
responses of the seagrass Halophila engelmanni from Florida.
Aquatic Botany 27, 195-201.
den Hartog, C. (1970). 'The Seagrasses of the World.' (North Holland
Publishing Co.: Amsterdam.)
Draper, N., and Smith, H. (1981). 'Applied Regression Analysis.' Wiley:
NewYork.)
Drew, E. A. (1980). Soluble carbohydrate composition of seagrasses. In
'Handbook of Seagrass Biology'. (Eds R. C. Phillips and C. P. McRoy.)
pp. 247-259. (Garland STPM: NewYork.)
Duffy, J. E., and Hay, M. E. (2001). Ecology and evolution of marine
consumer-prey interactions. In 'Marine Community Ecology'. (Eds
M. Bertness, M. E. Hay and S. D. Gaines.) pp. 131-157. (Sinauer Press:
Sunderland, MA.)
Greenway, M. (1974). The effects of cropping on the growth of Thalassia
testudinum in Jamaica. Aquaculture 4, 199-206. doi:10.1016/0044-
8486(74)90034-9
Humphreys, M. O. (1989). Water-soluble carbohydrates in perennial ryegrass
breeding. III. Relationships with herbage production, digestibility
and crude protein content. Grass and Forage Science 44, 423-430.
doi:10.1111/J.1365-2494.1989.TB01942.X
Hyland, S. J., Courtney, A. J., and Butler, C. T. (1989). 'Distribution of
Seagrass in the Moreton Region from Coolangatta to Noosa.' Queensland
Department of Primary Industries Information Series QI 189010.
(Queensland Government: Brisbane.)
Jacobs, R. P. W. M., den Hartog, C., Braster, B. F., and Carriere, F. C.
(1981). Grazing of the seagrass Zostera noltii by birds at Terschelling
(Dutch Wadden Sea). Aquatic Botany 10, 241-259. doi:10.1016/0304-
3770(81)90026-7
Jermyn, M. A. (1975). Increasing the sensitivity of the anthrone method for
carbohydrate. Analytical Biochemistry 68, 332-335. doi:10.1016/0003-
2697(75)90713-7
Jones, E. L., and Roberts, J. E. (1991). A note on the relationship between
palatability and water-soluble carbohydrates in perennial ryegrass. Irish
Journal of Agricultural Research 30, 163-167.
Lanyon, J. M. (1991). The nutritional ecology of the dugong, Dugong
dugon, in tropical Australian waters. Ph.D. Thesis, Monash University,
Melbourne.
Lanyon, J. M. (2003). Distribution and abundance of dugongs in Moreton
Bay, Queensland. Australian Wildlife Research 30, 397-409.
doi:10.1071/WR98082
Lanyon, J. M., Limpus, C. J., and Marsh, H. (1989). Dugongs and turtles:
grazers in the seagrass system. In 'Biology of Seagrasses'. (Eds
A. W. D. Larkum, A. J. McComb and S. A. Shepherd.) pp. 610-634.
(Elsevier: Amsterdam.)
Lee Long, W., Mellors, J. E., and Coles, R. G. (1993). Seagrasses between
Cape York and Hervey Bay, Queensland, Australia. Australian Journal
of Marine and Freshwater Research 44, 33-42.
Limpus, C. J. (1982). Status of Australian sea turtle populations. In 'Biology
and Conservation of Sea Turtles'. (Ed. K. A. Bjorndal.) pp. 207-393.
(Smithsonian Institution Press:Washington, DC.)
Limpus, C. J., Couper, P. J., and Read, M. A. (1994). The green turtle,
Chelonia mydas, in Queensland: population structure in a warm
temperate feeding area. Memoirs of the Queensland Museum 35,
139-154.
Mattson, W. J. (1980). Herbivory in relation to plant nitrogen content.
Annual Review of Ecology and Systematics 11, 119-161. doi:10.1146/
ANNUREV.ES.11.110180.001003
McMillan, C., and Phillips, R. C. (1979). Differentiation in habitat response
among populations of newworld seagrasses.Aquatic Botany 7, 185-196.
doi:10.1016/0304-3770(79)90021-4
Ogden, J. C. (1980). Faunal relationships in Caribbean seagrass beds. In
'Handbook of Seagrass Biology'. (Eds R. C. Phillips and C. P. McRoy.)
pp. 173-198. (Garland STPM: NewYork.)
Ogden, J. C., Tighe, S., and Miller, S. (1980). Grazing of seagrasses by large
herbivores in the Caribbean. American Zoologist 20, 949.
Ogden, J. C., Robinson, L., Whitlock, K., Daganhardt, H., and Cebula, R.
(1983). Diel foraging patterns in juvenile green turtles (Chelonia
mydas L.) in St. Croix United States Virgin Islands. Journal of Experimental
Marine Biology and Ecology 66, 199-205. doi:10.1016/0022-
0981(83)90160-0
Ott, J. A. (1980). Growth and production in Posidonia oceanica (L.) Delile.
P.S.Z.N.I. Marine Ecology 1, 47-64.
Phillips, R. C., and Lewis, R. L. (1983). Influence of environmental gradients
on variations in leaf widths and transplant success in North American
seagrasses. Marine Technology Society Journal 17, 59-68.
Pirc, H. (1985). Growth dynamics in Posidonia oceanica (L.) Delile.
P.S.Z.N.I. Marine Ecology 6, 141-165.
Poiner, I. R. (1984). Interspecific interactions: their role in structuring
multispecific seagrass communities. In 'The Ecological Basis of Interactions
Between Organisms. (Eds M. J. Liddle and J. C. Tothill.) AES
Monograph 1/84. (School of Australian Environmental Studies, Griffith
University, Brisbane.)
Preen, A. R. (1992). Interactions between dugongs and seagrasses in a subtropical
environment. Ph.D. Thesis, James Cook University of North
Queensland, Townsville.
Preen, A. R. (1995). Impacts of dugong foraging on seagrass habitats:
observational and experimental evidence for cultivation grazing. Marine
Ecology Progress Series 124, 201-213.
Radojevic, I., Simpson, R. J., St. John, J. A., and Humphreys, M. O.
(1994). Chemical composition and in vitro digestibility of lines of
Lolium perenne selected for high concentration of water-soluble carbohydrate.
Australian Journal of Agricultural Research 45, 901-912.
doi:10.1071/AR9940901
Read, M. A. (1991). Observations on the feeding ecology of immature green
turtles Chelonia mydas, in the Moreton Banks region of Moreton Bay,
south east Queensland. Honours Thesis, Department of Zoology, The
University of Queensland, Brisbane.
Thayer, G. W., Bjorndal, K. A., Ogden, J. C., Williams, S. L., and Zieman,
J. C. (1984). Role of larger herbivores in seagrass communities. Estuaries
7, 351-376. doi:10.2307/1351619
Valentine, J. F., and Heck, K. L., Jr (1991). The role of sea urchin
grazing in regulating seagrass meadow size. Journal of Experimental
Marine Biology and Ecology 154, 215-230. doi:10.1016/0022-0981(91)
90165-S
Walker, D. I., Lukatelich, R. J., Bastyan, G., and McComb, A. J.
(1989). Effect of boat moorings on seagrass beds near Perth, Western
Australia. Aquatic Botany 36, 69-77. doi:10.1016/0304-3770(89)
90092-2
Williams, S. L. (1988). Thalassia testudinum productivity and grazing by
green turtles in a highly disturbed seagrass bed. Marine Biology 98,
447-455. doi:10.1007/BF00391121
Yemm, E. W., and Willis, A. J. (1954). The estimation of carbohydrates in
plant extracts by anthrone. The Biochemical Journal 57, 508-514.
Young, P. C., and Kirkman, H. (1975). The seagrass communities of Moreton
Bay, Queensland. Aquatic Botany 1, 191-202. doi:10.1016/0304-
3770(75)90022-4
Zieman, J. C. (1975). Seasonal variation of turtle grass, Thalassia testudinum
Konig, with reference to temperature and salinity effects. Aquatic Botany
1, 107-123. doi:10.1016/0304-3770(75)90016-9
Zieman, J. C. (1976). The ecological effect of physical damage from motor
boats on turtle grass beds in southern Florida.Aquatic Botany 2, 127-139.
doi:10.1016/0304-3770(76)90015-2
Zieman, J. C., Iverson, R. L., and Ogden, J. C. (1984). Herbivory effects on
Thalassia testudinum leaf growth and nitrogen content. Marine Ecology
Progress Series 15, 151-158." name="eprints.referencetext" />
<meta content="Kuiper-Linley, Marianne and Johnson, Craig R. and Lanyon, Janet M. (2007) Effects of simulated green turtle regrazing on seagrass abundance, growth and nutritional status in Moreton Bay, south-east Queensland, Australia. Marine and Freshwater Research, 58 (5). pp. 492-503." name="eprints.citation" />
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<meta content="Effects of simulated green turtle regrazing on seagrass abundance, growth and nutritional status in Moreton Bay, south-east Queensland, Australia" name="DC.title" />
<meta content="Kuiper-Linley, Marianne" name="DC.creator" />
<meta content="Johnson, Craig R." name="DC.creator" />
<meta content="Lanyon, Janet M." name="DC.creator" />
<meta content="270702 Marine and Estuarine Ecology (incl. Marine Ichthyology)" name="DC.subject" />
<meta content="In some parts of their range, green turtles maintain grazing plots in seagrass beds by regular regrazing.
The effects of simulated repeated grazing on subtropical seagrasses in Moreton Bay, Australia were investigated in
a manipulative experiment over summer. Three seagrass species were subjected to two different clipping frequencies
(simulating turtle cropping) and compared with unclipped controls over a 3.5-month summer period for the effects on
seagrass biomass, leaf size and regrowth rates and water-soluble carbohydrate (WSC) and starch content. The order of
the seagrass species' relative tolerance to simulated grazing was Halophila ovalis>Zostera capricorni>Cymodocea
serrulata. Frequent regrazing of the green turtle's preferred seagrass, H. ovalis, resulted in an increase in leaf regrowth
rate so that standing biomass of leaves and total plant material was maintained, suggesting an increase in productivity.
Furthermore, whole-plant concentrations of WSC increased significantly in clipped H. ovalis plants relative to unclipped
controls. In contrast, leaf biomass of the seagrass species less preferred by turtles, Z. capricorni and C. serrulata, decreased
in response to repeated leaf removal relative to controls, despite maintenance of leaf regrowth rates. C. serrulata responded
to repeated clipping with a reduction in leaf size and a decrease in rhizomeWSCconcentration. Z. capricorni also produced
fewer and smaller newleaves.The ability of the preferred species, H. ovalis, to increase production of nutrient-rich standing
crop in response to regrazing has major implications for green turtles and other seagrass grazers.
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<h1 class="ep_tm_pagetitle">Effects of simulated green turtle regrazing on seagrass abundance, growth and nutritional status in Moreton Bay, south-east Queensland, Australia</h1>
<p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Kuiper-Linley, Marianne</span> and <span class="person_name">Johnson, Craig R.</span> and <span class="person_name">Lanyon, Janet M.</span> (2007) <xhtml:em>Effects of simulated green turtle regrazing on seagrass abundance, growth and nutritional status in Moreton Bay, south-east Queensland, Australia.</xhtml:em> Marine and Freshwater Research, 58 (5). pp. 492-503.</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/1100/1/2007_Kuiper-Linley%2C_Johnson_%26_Lanyon_Mar_%26__Freshwat_Res.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/1100/1/2007_Kuiper-Linley%2C_Johnson_%26_Lanyon_Mar_%26__Freshwat_Res.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />254Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="1348" name="docid" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1071/MF06241">http://dx.doi.org/10.1071/MF06241</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">In some parts of their range, green turtles maintain grazing plots in seagrass beds by regular regrazing.
The effects of simulated repeated grazing on subtropical seagrasses in Moreton Bay, Australia were investigated in
a manipulative experiment over summer. Three seagrass species were subjected to two different clipping frequencies
(simulating turtle cropping) and compared with unclipped controls over a 3.5-month summer period for the effects on
seagrass biomass, leaf size and regrowth rates and water-soluble carbohydrate (WSC) and starch content. The order of
the seagrass species' relative tolerance to simulated grazing was Halophila ovalis>Zostera capricorni>Cymodocea
serrulata. Frequent regrazing of the green turtle's preferred seagrass, H. ovalis, resulted in an increase in leaf regrowth
rate so that standing biomass of leaves and total plant material was maintained, suggesting an increase in productivity.
Furthermore, whole-plant concentrations of WSC increased significantly in clipped H. ovalis plants relative to unclipped
controls. In contrast, leaf biomass of the seagrass species less preferred by turtles, Z. capricorni and C. serrulata, decreased
in response to repeated leaf removal relative to controls, despite maintenance of leaf regrowth rates. C. serrulata responded
to repeated clipping with a reduction in leaf size and a decrease in rhizomeWSCconcentration. Z. capricorni also produced
fewer and smaller newleaves.The ability of the preferred species, H. ovalis, to increase production of nutrient-rich standing
crop in response to regrazing has major implications for green turtles and other seagrass grazers.
</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Additional Information:</th><td valign="top" class="ep_row">http://www.publish.csiro.au/nid/126/issue/3710.htm</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Chelonia mydas, disturbance, green turtle, regrazing, seagrass</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/270702.html">270000 Biological Sciences > 270700 Ecology and Evolution > 270702 Marine and Estuarine Ecology (incl. Marine Ichthyology)</a></td></tr><tr><th valign="top" class="ep_row">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">1100</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Professor Craig R. Johnson</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">31 May 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">04 Feb 2008 14:28</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=1100;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&eprintid=1100">item control page</a></p>
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