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  5.     <title>UTas ePrints - Hydrological and Ecological Survey of the Port Davey/Bathurst Channel Estuary 1988-1989</title>
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  13.     <meta content="Edgar, Graham J." name="eprints.creators_name" />
  14. <meta content="gedgar@utas.edu.au" name="eprints.creators_id" />
  15. <meta content="monograph" name="eprints.type" />
  16. <meta content="2007-09-03" name="eprints.datestamp" />
  17. <meta content="2008-01-08 15:30:00" name="eprints.lastmod" />
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  19. <meta content="Hydrological and Ecological Survey of the Port Davey/Bathurst Channel Estuary 1988-1989" name="eprints.title" />
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  25. <meta content="benthic surveys,
  26. marine reserves
  27. Bathurst harbour
  28. portdavey" name="eprints.keywords" />
  29. <meta content="Five field trips were conducted to the Bathurst Harbour/Port Davey area between October
  30. 1988 and July 1989. During each trip the hydrology, benthic fauna, plankton and fish
  31. assemblages in the Bathurst Harbour estuary were surveyed.
  32. During the winter period of peak freshwater outflow, a brackish surface layer (=15 %0)
  33. was present to a depth of =4 m throughout the estuary. The halocline broke down during summer
  34. with surface salinities of =29 %0 prevailing. Bottom waters were close to fully marine
  35. (=33%0) throughout the year.
  36. Surface waters in Bathurst Harbour were found to be extremely depleted in nitrates (<0.1 uM). Oxygen levels were also very low (=35% saturation) during February but were near ?
  37. saturation during the other sampling periods.
  38. Dinoflagellates and copepods were both extremely abundant in Bathurst Harbour. Diatoms
  39. were also abundant during the summer field trips, but were much less common than
  40. dinoflagellates on other occasions. Diatoms did, however, occur in higher densities than
  41. dinoflagellates in the waters of Port Davey. The plankton community (>20 um mesh size) in
  42. Bathurst Harbour was dominated by few taxa, particularly during the winter months. The
  43. dinoflagellate Dinophysis acuminata provided >99% of phytoplankton numbers in October 1988
  44. and July 1989, while the copepods GJadioferens inermis and Oithona austraJis and the
  45. appendicularian OikopJeura sp. provided almost all of the zooplankton numbers.
  46. The diversity of benthic plants and animals decreased rapidly up the Bathurst Harbour
  47. estuary. Discrete communities of benthic organisms, both sessile and motile, were found at the
  48. western entrance to Bathurst Channel and in the rest of the estuary. The overlap zone between the
  49. different communities was a relatively small area between Sarah Island and Schooner Cove.
  50. Mobile invertebrates were most abundant at the Bathurst Channel and Port Davey sites in
  51. February, and at the Bathurst Harbour sites in December. They showed high fidelity to location,
  52. with little indication in this study of a migration up or down the estuary in response to changes in
  53. salinity. Very few mobile invertebrates were found in Bathurst Harbour below 4 m depth.
  54. Fishes in the Bathurst Harbour estuary also showed little response to seasonal changes in
  55. salinity. A number of fishes were, however, possibly prevented from entering the estuary
  56. during February because of low oxygen concentrations then prevailing.
  57.  
  58. The assemblage of Bathurst Harbour fishes collected by gillnet was unusual in being
  59. dominated by sharks and skates, with all of the common species also being distributed in water
  60. depths >50m along the continentalshelf. The assemblage thus has many characteristics typical
  61. of a deep water assemblage. Included amongst the Bathurst Harbour fishes was a previously
  62. unknown species of skate which may be restricted to the estuary.
  63. By far the most common of the larger fishes was the white-spotted dogfish Squalus
  64. acanthias; this species comprised 86% of the total gillnet catch. Despite these large catches, a
  65. tagging study in which a very high proportion (26 %) of tagged dogfish were recaptured indicated
  66. that the total population in the estuary was not huge, being in the order of only 2,500 animals.
  67. Tagged animals roamed widely through the estuary.
  68. The major recommendations of the study are that gillnets be banned from the Bathurst
  69. Harbour estuary, that the low nutrient status of the estuary be maintained, and that steps be taken
  70. to ensure that the unique Caulerpa algal beds in Kelly Basin be preserved." name="eprints.abstract" />
  71. <meta content="1992" name="eprints.date" />
  72. <meta content="published" name="eprints.date_type" />
  73. <meta content="Marine Research Laboratories" name="eprints.publisher" />
  74. <meta content="Tasmania" name="eprints.place_of_pub" />
  75. <meta content="111" name="eprints.pages" />
  76. <meta content="116120056" name="eprints.id_number" />
  77. <meta content="University of Tasmania" name="eprints.institution" />
  78. <meta content="Tasmanian Aquaculture &amp; Fisheries Institute" name="eprints.department" />
  79. <meta content="UNSPECIFIED" name="eprints.thesis_type" />
  80. <meta content="Edgar, Graham J. (1992) Hydrological and Ecological Survey of the Port Davey/Bathurst Channel Estuary 1988-1989. Technical Report. Marine Research Laboratories, Tasmania." name="eprints.citation" />
  81. <meta content="http://eprints.utas.edu.au/1739/1/HydrologicalandEcological.pdf" name="eprints.document_url" />
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  83. <meta content="Hydrological and Ecological Survey of the Port Davey/Bathurst Channel Estuary 1988-1989" name="DC.title" />
  84. <meta content="Edgar, Graham J." name="DC.creator" />
  85. <meta content="270708 Conservation and Biodiversity" name="DC.subject" />
  86. <meta content="270702 Marine and Estuarine Ecology (incl. Marine Ichthyology)" name="DC.subject" />
  87. <meta content="Five field trips were conducted to the Bathurst Harbour/Port Davey area between October
  88. 1988 and July 1989. During each trip the hydrology, benthic fauna, plankton and fish
  89. assemblages in the Bathurst Harbour estuary were surveyed.
  90. During the winter period of peak freshwater outflow, a brackish surface layer (=15 %0)
  91. was present to a depth of =4 m throughout the estuary. The halocline broke down during summer
  92. with surface salinities of =29 %0 prevailing. Bottom waters were close to fully marine
  93. (=33%0) throughout the year.
  94. Surface waters in Bathurst Harbour were found to be extremely depleted in nitrates (<0.1 uM). Oxygen levels were also very low (=35% saturation) during February but were near ?
  95. saturation during the other sampling periods.
  96. Dinoflagellates and copepods were both extremely abundant in Bathurst Harbour. Diatoms
  97. were also abundant during the summer field trips, but were much less common than
  98. dinoflagellates on other occasions. Diatoms did, however, occur in higher densities than
  99. dinoflagellates in the waters of Port Davey. The plankton community (>20 um mesh size) in
  100. Bathurst Harbour was dominated by few taxa, particularly during the winter months. The
  101. dinoflagellate Dinophysis acuminata provided >99% of phytoplankton numbers in October 1988
  102. and July 1989, while the copepods GJadioferens inermis and Oithona austraJis and the
  103. appendicularian OikopJeura sp. provided almost all of the zooplankton numbers.
  104. The diversity of benthic plants and animals decreased rapidly up the Bathurst Harbour
  105. estuary. Discrete communities of benthic organisms, both sessile and motile, were found at the
  106. western entrance to Bathurst Channel and in the rest of the estuary. The overlap zone between the
  107. different communities was a relatively small area between Sarah Island and Schooner Cove.
  108. Mobile invertebrates were most abundant at the Bathurst Channel and Port Davey sites in
  109. February, and at the Bathurst Harbour sites in December. They showed high fidelity to location,
  110. with little indication in this study of a migration up or down the estuary in response to changes in
  111. salinity. Very few mobile invertebrates were found in Bathurst Harbour below 4 m depth.
  112. Fishes in the Bathurst Harbour estuary also showed little response to seasonal changes in
  113. salinity. A number of fishes were, however, possibly prevented from entering the estuary
  114. during February because of low oxygen concentrations then prevailing.
  115.  
  116. The assemblage of Bathurst Harbour fishes collected by gillnet was unusual in being
  117. dominated by sharks and skates, with all of the common species also being distributed in water
  118. depths >50m along the continentalshelf. The assemblage thus has many characteristics typical
  119. of a deep water assemblage. Included amongst the Bathurst Harbour fishes was a previously
  120. unknown species of skate which may be restricted to the estuary.
  121. By far the most common of the larger fishes was the white-spotted dogfish Squalus
  122. acanthias; this species comprised 86% of the total gillnet catch. Despite these large catches, a
  123. tagging study in which a very high proportion (26 %) of tagged dogfish were recaptured indicated
  124. that the total population in the estuary was not huge, being in the order of only 2,500 animals.
  125. Tagged animals roamed widely through the estuary.
  126. The major recommendations of the study are that gillnets be banned from the Bathurst
  127. Harbour estuary, that the low nutrient status of the estuary be maintained, and that steps be taken
  128. to ensure that the unique Caulerpa algal beds in Kelly Basin be preserved." name="DC.description" />
  129. <meta content="Marine Research Laboratories" name="DC.publisher" />
  130. <meta content="1992" name="DC.date" />
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  135. <meta content="Edgar, Graham J. (1992) Hydrological and Ecological Survey of the Port Davey/Bathurst Channel Estuary 1988-1989. Technical Report. Marine Research Laboratories, Tasmania." name="DC.identifier" />
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  242.     <h1 class="ep_tm_pagetitle">Hydrological and Ecological Survey of the Port Davey/Bathurst Channel Estuary 1988-1989</h1>
  243.     <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Edgar, Graham J.</span> (1992) <xhtml:em>Hydrological and Ecological Survey of the Port Davey/Bathurst Channel Estuary 1988-1989.</xhtml:em> Technical Report. Marine Research Laboratories, Tasmania.</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 onmouseover="EPJS_ShowPreview( event, 'doc_preview_2232' );" href="http://eprints.utas.edu.au/1739/1/HydrologicalandEcological.pdf" onmouseout="EPJS_HidePreview( event, 'doc_preview_2232' );"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a><div class="ep_preview" id="doc_preview_2232"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/1739/thumbnails/1/preview.png" class="ep_preview_image" border="0" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/1739/1/HydrologicalandEcological.pdf"><span class="ep_document_citation">PDF</span></a> - Requires a PDF viewer<br />6Mb</td></tr></table><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Five field trips were conducted to the Bathurst Harbour/Port Davey area between October&#13;
  244. 1988 and July 1989. During each trip the hydrology, benthic fauna, plankton and fish&#13;
  245. assemblages in the Bathurst Harbour estuary were surveyed.&#13;
  246. During the winter period of peak freshwater outflow, a brackish surface layer (=15 %0)&#13;
  247. was present to a depth of =4 m throughout the estuary. The halocline broke down during summer&#13;
  248. with surface salinities of =29 %0 prevailing. Bottom waters were close to fully marine&#13;
  249. (=33%0) throughout the year.&#13;
  250. Surface waters in Bathurst Harbour were found to be extremely depleted in nitrates (&lt;0.1 uM). Oxygen levels were also very low (=35% saturation) during February but were near ?&#13;
  251. saturation during the other sampling periods.&#13;
  252. Dinoflagellates and copepods were both extremely abundant in Bathurst Harbour. Diatoms&#13;
  253. were also abundant during the summer field trips, but were much less common than&#13;
  254. dinoflagellates on other occasions. Diatoms did, however, occur in higher densities than&#13;
  255. dinoflagellates in the waters of Port Davey. The plankton community (&gt;20 um mesh size) in&#13;
  256. Bathurst Harbour was dominated by few taxa, particularly during the winter months. The&#13;
  257. dinoflagellate Dinophysis acuminata provided &gt;99% of phytoplankton numbers in October 1988&#13;
  258. and July 1989, while the copepods GJadioferens inermis and Oithona austraJis and the&#13;
  259. appendicularian OikopJeura sp. provided almost all of the zooplankton numbers.&#13;
  260. The diversity of benthic plants and animals decreased rapidly up the Bathurst Harbour&#13;
  261. estuary. Discrete communities of benthic organisms, both sessile and motile, were found at the&#13;
  262. western entrance to Bathurst Channel and in the rest of the estuary. The overlap zone between the&#13;
  263. different communities was a relatively small area between Sarah Island and Schooner Cove.&#13;
  264. Mobile invertebrates were most abundant at the Bathurst Channel and Port Davey sites in&#13;
  265. February, and at the Bathurst Harbour sites in December. They showed high fidelity to location,&#13;
  266. with little indication in this study of a migration up or down the estuary in response to changes in&#13;
  267. salinity. Very few mobile invertebrates were found in Bathurst Harbour below 4 m depth.&#13;
  268. Fishes in the Bathurst Harbour estuary also showed little response to seasonal changes in&#13;
  269. salinity. A number of fishes were, however, possibly prevented from entering the estuary&#13;
  270. during February because of low oxygen concentrations then prevailing.&#13;
  271. &#13;
  272. The assemblage of Bathurst Harbour fishes collected by gillnet was unusual in being&#13;
  273. dominated by sharks and skates, with all of the common species also being distributed in water&#13;
  274. depths &gt;50m along the continentalshelf. The assemblage thus has many characteristics typical&#13;
  275. of a deep water assemblage. Included amongst the Bathurst Harbour fishes was a previously&#13;
  276. unknown species of skate which may be restricted to the estuary.&#13;
  277. By far the most common of the larger fishes was the white-spotted dogfish Squalus&#13;
  278. acanthias; this species comprised 86% of the total gillnet catch. Despite these large catches, a&#13;
  279. tagging study in which a very high proportion (26 %) of tagged dogfish were recaptured indicated&#13;
  280. that the total population in the estuary was not huge, being in the order of only 2,500 animals.&#13;
  281. Tagged animals roamed widely through the estuary.&#13;
  282. The major recommendations of the study are that gillnets be banned from the Bathurst&#13;
  283. Harbour estuary, that the low nutrient status of the estuary be maintained, and that steps be taken&#13;
  284. to ensure that the unique Caulerpa algal beds in Kelly Basin be preserved.</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">Report (Technical Report)</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">benthic surveys,&#13;
  285. marine reserves&#13;
  286. Bathurst harbour&#13;
  287. portdavey</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/270708.html">270000 Biological Sciences &gt; 270700 Ecology and Evolution &gt; 270708 Conservation and Biodiversity</a><br /><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">ID Code:</th><td valign="top" class="ep_row">1739</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">Mr David Lenel</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">03 Sep 2007</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</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=1739;">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=1739">item control page</a></p>
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