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    <title>UTas ePrints - Mesoscale dispersal of the introduced kelp Undaria pinnatifida attached to unstable substrata</title>
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    <meta content="Sliwa, Cathryn" name="eprints.creators_name" />
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<meta content="Mesoscale dispersal of the introduced kelp Undaria pinnatifida attached to unstable substrata
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<meta content="In areas of Tasmania and New Zealand, the introduced
Japanese alga, Undaria pinnatifida, grows attached to
unstable substrata such as small cobbles and shells.
Observations suggest these algae may disperse by saltation
(i.e., a series of jumps) while attached to their substratum.
A predictive model was developed to estimate
the dispersal rate of U. pinnatifida by this mechanism,
depending on drag force (as a function of lamina surface
area and water velocity), the buoyant weight of the
attached substratum and the depth at which the alga
was located. The model was parameterised based on
empirical measurements of 89 tagged thalli in the field,
and estimates of drag on different sized laminae determined
from experiments in a large flume tank. Empirical
observations and model predictions suggest that under
typical conditions at moderately exposed sites, dispersal
via this mechanism is likely to be of the order of at least
10[to the power of]1 - 10[to the power of]2 m per year. When compared to the likely dispersal
of spores from the parent (approx 10 [to the power of]1 m per year), and
the likely dispersal of fertile drift thalli (approx 10[to the power of]4 m per
year), we suggest that algae on unstable substrata may
provide a mechanism for intermediate dispersal over
moderate distances, providing sufficient spore density to
ensure high fertilisation success. This is likely to enhance
the rate of spread of U. pinnatifida in circumstances
where habitat suitable for establishment is available." name="eprints.abstract" />
<meta content="2006" name="eprints.date" />
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<meta content="Botanica Marina" name="eprints.publication" />
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<meta content="396-405" name="eprints.pagerange" />
<meta content="10.1515/BOT.2006.051" name="eprints.id_number" />
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<meta content="Aguilar-Rosas, R., L.E. Aguilar-Rosas, G. vila-Serrano and R.
Marcos-RamiÃÂez. 2004. First record of Undaria pinnatifida
(Harvey) Suringar (Laminariales, Phaeophyta) on the Pacific
coast of Mexico. Bot. Mar. 47: 255-258.
Ambose, R.F. and B.V. Nelson. 1982. Inhibition of giant kelp
recruitment by an introduced brown alga. Bot. Mar. 25:
265-267.
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production and dispersal in the giant kelp Macrocystis. Proc.
Int. Seaweed Symposium 5: 73-86.
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Ben-Avraham, Z. (1971). Accumulation of stones on beaches by
Codium fragile. Limnol. Oceanogr. 16: 553-554.
Campbell, S.J. and T.R. Burridge. 1998. Occurrence of Undaria
pinnatifida (Phaeophyta: Laminariales) in Port Phillip Bay, Victoria,
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physical removal of a marine pest: the introduced kelp Undaria
pinnatifida in a Tasmanian Marine Reserve. Biol. Invasions
7: 251-263.
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of thallus size, life stage, aggregation, wave exposure and
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the small kelp Ecklonia radiata. Bot. Mar. 47: 454-460.
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introduced kelp Undaria pinnatifida in Tasmania depends on
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Ecol. 295: 63-90.
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<meta content="Hewitt, Chad L." name="DC.creator" />
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<meta content="In areas of Tasmania and New Zealand, the introduced
Japanese alga, Undaria pinnatifida, grows attached to
unstable substrata such as small cobbles and shells.
Observations suggest these algae may disperse by saltation
(i.e., a series of jumps) while attached to their substratum.
A predictive model was developed to estimate
the dispersal rate of U. pinnatifida by this mechanism,
depending on drag force (as a function of lamina surface
area and water velocity), the buoyant weight of the
attached substratum and the depth at which the alga
was located. The model was parameterised based on
empirical measurements of 89 tagged thalli in the field,
and estimates of drag on different sized laminae determined
from experiments in a large flume tank. Empirical
observations and model predictions suggest that under
typical conditions at moderately exposed sites, dispersal
via this mechanism is likely to be of the order of at least
10[to the power of]1 - 10[to the power of]2 m per year. When compared to the likely dispersal
of spores from the parent (approx 10 [to the power of]1 m per year), and
the likely dispersal of fertile drift thalli (approx 10[to the power of]4 m per
year), we suggest that algae on unstable substrata may
provide a mechanism for intermediate dispersal over
moderate distances, providing sufficient spore density to
ensure high fertilisation success. This is likely to enhance
the rate of spread of U. pinnatifida in circumstances
where habitat suitable for establishment is available." name="DC.description" />
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    <h1 class="ep_tm_pagetitle">Mesoscale dispersal of the introduced kelp Undaria pinnatifida attached to unstable substrata</h1>
    <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Sliwa, Cathryn</span> and <span class="person_name">Johnson, Craig R.</span> and <span class="person_name">Hewitt, Chad L.</span> (2006) <xhtml:em>Mesoscale dispersal of the introduced kelp Undaria pinnatifida attached to unstable substrata.</xhtml:em> Botanica Marina, 49 (5-6). pp. 396-405.</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/1054/1/2006_Sliwa%2C_Johnson_%26_Hewitt_Botanica_Marina.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/1054/1/2006_Sliwa%2C_Johnson_%26_Hewitt_Botanica_Marina.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />146Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input value="1234" name="docid" accept-charset="utf-8" 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/10.1515/BOT.2006.051">http://dx.doi.org/10.1515/BOT.2006.051</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">In areas of Tasmania and New Zealand, the introduced&#13;
Japanese alga, Undaria pinnatifida, grows attached to&#13;
unstable substrata such as small cobbles and shells.&#13;
Observations suggest these algae may disperse by saltation&#13;
(i.e., a series of jumps) while attached to their substratum.&#13;
A predictive model was developed to estimate&#13;
the dispersal rate of U. pinnatifida by this mechanism,&#13;
depending on drag force (as a function of lamina surface&#13;
area and water velocity), the buoyant weight of the&#13;
attached substratum and the depth at which the alga&#13;
was located. The model was parameterised based on&#13;
empirical measurements of 89 tagged thalli in the field,&#13;
and estimates of drag on different sized laminae determined&#13;
from experiments in a large flume tank. Empirical&#13;
observations and model predictions suggest that under&#13;
typical conditions at moderately exposed sites, dispersal&#13;
via this mechanism is likely to be of the order of at least&#13;
10[to the power of]1 - 10[to the power of]2 m per year. When compared to the likely dispersal&#13;
of spores from the parent (approx 10 [to the power of]1 m per year), and&#13;
the likely dispersal of fertile drift thalli (approx 10[to the power of]4 m per&#13;
year), we suggest that algae on unstable substrata may&#13;
provide a mechanism for intermediate dispersal over&#13;
moderate distances, providing sufficient spore density to&#13;
ensure high fertilisation success. This is likely to enhance&#13;
the rate of spread of U. pinnatifida in circumstances&#13;
where habitat suitable for establishment is available.</p></div><table style="margin-bottom: 1em" border="0" cellpadding="3" class="not_ep_block"><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">Keywords:</th><td valign="top" class="ep_row">dispersal; invasion biology; macroalga; Undaria pinnatifida; unstable substrata</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 &gt; 270700 Ecology and Evolution &gt; 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">1054</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">18 May 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">06 Feb 2008 23:19</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=1054;">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&amp;eprintid=1054">item control page</a></p>
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