Release of dissolved organic carbon from seagrass wrack and its implications for trophic connectivity
The export of old leaves and stems (wrack) from seagrass meadows provides a mechanism for trophic connectivity among coastal ecosystems. As little of this wrack is consumed by mesograzers, leached dissolved organic carbon (DOC) may determine the importance of wrack as a trophic subsidy. However, few...
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Veröffentlicht in: | Marine ecology. Progress series (Halstenbek) 2013-12, Vol.494, p.121-133 |
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description | The export of old leaves and stems (wrack) from seagrass meadows provides a mechanism for trophic connectivity among coastal ecosystems. As little of this wrack is consumed by mesograzers, leached dissolved organic carbon (DOC) may determine the importance of wrack as a trophic subsidy. However, few studies have examined the effect of seagrass type or age on the release of DOC or its bioavailability. We examined the amount and composition of DOC released from different wrack: Posidonia sinuosa, Amphibolis antarctica and the alga Laurencia sp. We then examined the effect of age on DOC leaching from P. sinuosa wrack. The bioavailability of the DOC was also assessed using a bacterial bioassay. The rate of DOC leaching from P. sinuosa leaves decreased exponentially with time. According to that exponential model, ~50% of the total DOC release occurred in the first 14 d and it would require a further 2.94 yr to release the same amount again. Fresh algae Laurencia sp. leached the greatest amount of DOC in the first 16 h (6.7 g kg–1 fresh weight (FW) wrack), followed by fresh P. sinuosa leaves (1.7 g kg–1 FW), A. antarctica leaves (1.1 g kg–1) and stems (0.6 g kg–1), 4 wk old P. sinuosa (67 g kg–1) and fine detritus (74 g kg–1). In all cases, the composition of the DOC was similar and dominated by the hydrophilic component (in P. sinuosa, predominantly sugars and amino acids). Leachates from all fresh wrack supported bacterial growth over 24 h. Leachate from older wrack either failed to support bacterial growth or only supported it for a limited time. Given the exponential decay in DOC release rate, the interacting timescales of transport and leaching will affect the value of wrack as a vector for trophic subsidies. |
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As little of this wrack is consumed by mesograzers, leached dissolved organic carbon (DOC) may determine the importance of wrack as a trophic subsidy. However, few studies have examined the effect of seagrass type or age on the release of DOC or its bioavailability. We examined the amount and composition of DOC released from different wrack: Posidonia sinuosa, Amphibolis antarctica and the alga Laurencia sp. We then examined the effect of age on DOC leaching from P. sinuosa wrack. The bioavailability of the DOC was also assessed using a bacterial bioassay. The rate of DOC leaching from P. sinuosa leaves decreased exponentially with time. According to that exponential model, ~50% of the total DOC release occurred in the first 14 d and it would require a further 2.94 yr to release the same amount again. Fresh algae Laurencia sp. leached the greatest amount of DOC in the first 16 h (6.7 g kg–1 fresh weight (FW) wrack), followed by fresh P. sinuosa leaves (1.7 g kg–1 FW), A. antarctica leaves (1.1 g kg–1) and stems (0.6 g kg–1), 4 wk old P. sinuosa (67 g kg–1) and fine detritus (74 g kg–1). In all cases, the composition of the DOC was similar and dominated by the hydrophilic component (in P. sinuosa, predominantly sugars and amino acids). Leachates from all fresh wrack supported bacterial growth over 24 h. Leachate from older wrack either failed to support bacterial growth or only supported it for a limited time. Given the exponential decay in DOC release rate, the interacting timescales of transport and leaching will affect the value of wrack as a vector for trophic subsidies.</description><identifier>ISSN: 0171-8630</identifier><identifier>EISSN: 1616-1599</identifier><identifier>DOI: 10.3354/meps10554</identifier><language>eng</language><publisher>Oldendorf: Inter-Research</publisher><subject>Amphibolis antarctica ; Animal and plant ecology ; Animal, plant and microbial ecology ; Biological and medical sciences ; Fundamental and applied biological sciences. Psychology ; Laurencia ; Posidonia sinuosa ; Sea water ecosystems ; Synecology</subject><ispartof>Marine ecology. 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Progress series (Halstenbek)</title><description>The export of old leaves and stems (wrack) from seagrass meadows provides a mechanism for trophic connectivity among coastal ecosystems. As little of this wrack is consumed by mesograzers, leached dissolved organic carbon (DOC) may determine the importance of wrack as a trophic subsidy. However, few studies have examined the effect of seagrass type or age on the release of DOC or its bioavailability. We examined the amount and composition of DOC released from different wrack: Posidonia sinuosa, Amphibolis antarctica and the alga Laurencia sp. We then examined the effect of age on DOC leaching from P. sinuosa wrack. The bioavailability of the DOC was also assessed using a bacterial bioassay. The rate of DOC leaching from P. sinuosa leaves decreased exponentially with time. According to that exponential model, ~50% of the total DOC release occurred in the first 14 d and it would require a further 2.94 yr to release the same amount again. Fresh algae Laurencia sp. leached the greatest amount of DOC in the first 16 h (6.7 g kg–1 fresh weight (FW) wrack), followed by fresh P. sinuosa leaves (1.7 g kg–1 FW), A. antarctica leaves (1.1 g kg–1) and stems (0.6 g kg–1), 4 wk old P. sinuosa (67 g kg–1) and fine detritus (74 g kg–1). In all cases, the composition of the DOC was similar and dominated by the hydrophilic component (in P. sinuosa, predominantly sugars and amino acids). Leachates from all fresh wrack supported bacterial growth over 24 h. Leachate from older wrack either failed to support bacterial growth or only supported it for a limited time. Given the exponential decay in DOC release rate, the interacting timescales of transport and leaching will affect the value of wrack as a vector for trophic subsidies.</description><subject>Amphibolis antarctica</subject><subject>Animal and plant ecology</subject><subject>Animal, plant and microbial ecology</subject><subject>Biological and medical sciences</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Laurencia</subject><subject>Posidonia sinuosa</subject><subject>Sea water ecosystems</subject><subject>Synecology</subject><issn>0171-8630</issn><issn>1616-1599</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNpF0EtLw0AUBeBBFKzVhT9AmI2gi-g8knksRXxBQRBdh5vJpE5NMnFuWum_t9JSV3dxv3MWh5Bzzm6kLPLbzg_IWVHkB2TCFVcZL6w9JBPGNc-MkuyYnCAuGOMq12pC_JtvPaCnsaF1QIztytc0pjn0wVEHqYo9bVLsKHqYJ0CkPwncF4W-pmFEGrqhDQ7GEHukTUx0THH4_MvGvvduDKswrk_JUQMt-rPdnZKPx4f3--ds9vr0cn83y5zM7ZgVUgoLinPGrawgrwtZGQvGKKMbWUlVicJ6J4X2tWhcrV1unVBMcyErV1RySq62vUOK30uPY9kFdL5tofdxiSVXQlulJTcber2lLkXE5JtySKGDtC45K_-mLPdTbuzlrhbQQdsk6F3AfUAYZnLN1cZdbN0Cx5j-_7mxwkghfwFcPX6i</recordid><startdate>20131204</startdate><enddate>20131204</enddate><creator>Lavery, Paul S.</creator><creator>McMahon, Kathryn</creator><creator>Weyers, Julia</creator><creator>Boyce, Mary C.</creator><creator>Oldham, Carolyn E.</creator><general>Inter-Research</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SN</scope><scope>7TN</scope><scope>7TV</scope><scope>C1K</scope><scope>F1W</scope><scope>H95</scope><scope>L.G</scope></search><sort><creationdate>20131204</creationdate><title>Release of dissolved organic carbon from seagrass wrack and its implications for trophic connectivity</title><author>Lavery, Paul S. ; McMahon, Kathryn ; Weyers, Julia ; Boyce, Mary C. ; Oldham, Carolyn E.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c349t-53329a6110193ba4d53b89a88687f3b36b259ec327ed2fcd7c49c2607123bc5b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Amphibolis antarctica</topic><topic>Animal and plant ecology</topic><topic>Animal, plant and microbial ecology</topic><topic>Biological and medical sciences</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Laurencia</topic><topic>Posidonia sinuosa</topic><topic>Sea water ecosystems</topic><topic>Synecology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lavery, Paul S.</creatorcontrib><creatorcontrib>McMahon, Kathryn</creatorcontrib><creatorcontrib>Weyers, Julia</creatorcontrib><creatorcontrib>Boyce, Mary C.</creatorcontrib><creatorcontrib>Oldham, Carolyn E.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Ecology Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Pollution Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Marine ecology. Progress series (Halstenbek)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lavery, Paul S.</au><au>McMahon, Kathryn</au><au>Weyers, Julia</au><au>Boyce, Mary C.</au><au>Oldham, Carolyn E.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Release of dissolved organic carbon from seagrass wrack and its implications for trophic connectivity</atitle><jtitle>Marine ecology. Progress series (Halstenbek)</jtitle><date>2013-12-04</date><risdate>2013</risdate><volume>494</volume><spage>121</spage><epage>133</epage><pages>121-133</pages><issn>0171-8630</issn><eissn>1616-1599</eissn><abstract>The export of old leaves and stems (wrack) from seagrass meadows provides a mechanism for trophic connectivity among coastal ecosystems. As little of this wrack is consumed by mesograzers, leached dissolved organic carbon (DOC) may determine the importance of wrack as a trophic subsidy. However, few studies have examined the effect of seagrass type or age on the release of DOC or its bioavailability. We examined the amount and composition of DOC released from different wrack: Posidonia sinuosa, Amphibolis antarctica and the alga Laurencia sp. We then examined the effect of age on DOC leaching from P. sinuosa wrack. The bioavailability of the DOC was also assessed using a bacterial bioassay. The rate of DOC leaching from P. sinuosa leaves decreased exponentially with time. According to that exponential model, ~50% of the total DOC release occurred in the first 14 d and it would require a further 2.94 yr to release the same amount again. Fresh algae Laurencia sp. leached the greatest amount of DOC in the first 16 h (6.7 g kg–1 fresh weight (FW) wrack), followed by fresh P. sinuosa leaves (1.7 g kg–1 FW), A. antarctica leaves (1.1 g kg–1) and stems (0.6 g kg–1), 4 wk old P. sinuosa (67 g kg–1) and fine detritus (74 g kg–1). In all cases, the composition of the DOC was similar and dominated by the hydrophilic component (in P. sinuosa, predominantly sugars and amino acids). Leachates from all fresh wrack supported bacterial growth over 24 h. Leachate from older wrack either failed to support bacterial growth or only supported it for a limited time. Given the exponential decay in DOC release rate, the interacting timescales of transport and leaching will affect the value of wrack as a vector for trophic subsidies.</abstract><cop>Oldendorf</cop><pub>Inter-Research</pub><doi>10.3354/meps10554</doi><tpages>13</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Amphibolis antarctica Animal and plant ecology Animal, plant and microbial ecology Biological and medical sciences Fundamental and applied biological sciences. Psychology Laurencia Posidonia sinuosa Sea water ecosystems Synecology |
title | Release of dissolved organic carbon from seagrass wrack and its implications for trophic connectivity |
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