<str<strong>on</strong>g>Proceedings</str<strong>on</strong>g> <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> <str<strong>on</strong>g>Third</str<strong>on</strong>g> <str<strong>on</strong>g>Internati<strong>on</strong>al</str<strong>on</strong>g> <str<strong>on</strong>g>C<strong>on</strong>ference</str<strong>on</strong>g> <strong>on</strong> <strong>Invasive</strong> SpartinaChapter 3: Ecosystem Effects <str<strong>on</strong>g>of</str<strong>on</strong>g> <strong>Invasive</strong> Spartinanature <str<strong>on</strong>g>of</str<strong>on</strong>g> Spartina tissue (Peters<strong>on</strong> and Howarth 1987). Of<str<strong>on</strong>g>the</str<strong>on</strong>g> two Spartina tissue types sampled, we were expectingmore c<strong>on</strong>strained IsoSource soluti<strong>on</strong>s for standing deadSpartina c<strong>on</strong>tributi<strong>on</strong>s to bivalve diets since we expecteddead tissue to more closely match <str<strong>on</strong>g>the</str<strong>on</strong>g> detritus available tobivalves (Table 1). The living Spartina tissue samples in thisstudy were newly emerged leaves, whereas <str<strong>on</strong>g>the</str<strong>on</strong>g> deadSpartina samples c<strong>on</strong>sisted <str<strong>on</strong>g>of</str<strong>on</strong>g> standing dead Spartina stemsand leaves. Living and dead Spartina biomass were sampledto represent <str<strong>on</strong>g>the</str<strong>on</strong>g> end points <str<strong>on</strong>g>of</str<strong>on</strong>g> a range <str<strong>on</strong>g>of</str<strong>on</strong>g> potential Spartinaisotopic signatures during its life history. The range <str<strong>on</strong>g>of</str<strong>on</strong>g>potential intermediate isotopic values that may occur duringsenescence is apparent as <str<strong>on</strong>g>the</str<strong>on</strong>g> distance between <str<strong>on</strong>g>the</str<strong>on</strong>g>signatures <str<strong>on</strong>g>of</str<strong>on</strong>g> living and dead Spartina (Figs. 1A-C).It may seem c<strong>on</strong>tradictory that <str<strong>on</strong>g>the</str<strong>on</strong>g> mixing models in thisstudy indicate <str<strong>on</strong>g>the</str<strong>on</strong>g> use <str<strong>on</strong>g>of</str<strong>on</strong>g> Spartina living tissue when <str<strong>on</strong>g>the</str<strong>on</strong>g>bivalves sampled are sediment dwelling or epifaunaldetritivores. These estimates suggest that as Spartinadecomposes, plant fragments in <str<strong>on</strong>g>the</str<strong>on</strong>g> early stages <str<strong>on</strong>g>of</str<strong>on</strong>g> decaymay be c<strong>on</strong>sumed. Early during decay, Spartina would haveits greatest nutriti<strong>on</strong>al value and would be at its leastrecalcitrant since C:N ratios more than double from livingtissue to <str<strong>on</strong>g>the</str<strong>on</strong>g> standing dead tissue phase <str<strong>on</strong>g>of</str<strong>on</strong>g> Spartina(Hellquist 2005). Alternatively, <str<strong>on</strong>g>the</str<strong>on</strong>g> use <str<strong>on</strong>g>of</str<strong>on</strong>g> Spartina detritusby <str<strong>on</strong>g>the</str<strong>on</strong>g> bivalves may be <str<strong>on</strong>g>the</str<strong>on</strong>g> result <str<strong>on</strong>g>of</str<strong>on</strong>g> trophic modificati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g><str<strong>on</strong>g>the</str<strong>on</strong>g> biomass as it passes through <str<strong>on</strong>g>the</str<strong>on</strong>g> detrital food web(Peters<strong>on</strong> et al. 1986).The spatial proximity <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> bivalves to <str<strong>on</strong>g>the</str<strong>on</strong>g> edge <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g>Spartina meadow probably accounts for <str<strong>on</strong>g>the</str<strong>on</strong>g> higher thanexpected inputs <str<strong>on</strong>g>of</str<strong>on</strong>g> Spartina in <str<strong>on</strong>g>the</str<strong>on</strong>g> bivalve diets. Although asimilar study <str<strong>on</strong>g>of</str<strong>on</strong>g> S. anglica and bivalves did not find arelati<strong>on</strong>ship between Spartina c<strong>on</strong>sumpti<strong>on</strong> and proximity toSpartina (Riera et al. 1999), o<str<strong>on</strong>g>the</str<strong>on</strong>g>r work has linked spatialproximity <str<strong>on</strong>g>of</str<strong>on</strong>g> c<strong>on</strong>sumers to Spartina with <str<strong>on</strong>g>the</str<strong>on</strong>g> magnitude <str<strong>on</strong>g>of</str<strong>on</strong>g>Spartina dietary c<strong>on</strong>tributi<strong>on</strong>s (Peters<strong>on</strong> et al. 1986; Peters<strong>on</strong>and Howarth 1987). Local sources <str<strong>on</strong>g>of</str<strong>on</strong>g> organic matter were <str<strong>on</strong>g>of</str<strong>on</strong>g>major dietary importance to <str<strong>on</strong>g>the</str<strong>on</strong>g> c<strong>on</strong>sumers sampled in aMassachusetts estuary (Deegan and Garritt 1997). Forexample, c<strong>on</strong>sumers in <str<strong>on</strong>g>the</str<strong>on</strong>g> upper estuary relied <strong>on</strong>freshwater marsh organic matter and oligohalinephytoplankt<strong>on</strong>, whereas in <str<strong>on</strong>g>the</str<strong>on</strong>g> lower estuary marine sourceswere more important (e.g. benthic diatoms and salt marshvegetati<strong>on</strong>). We sampled bivalves collected from a tidalcreek passing through an extensive Spartina meadow, whereSpartina was <str<strong>on</strong>g>the</str<strong>on</strong>g> <strong>on</strong>ly immediate source <str<strong>on</strong>g>of</str<strong>on</strong>g> vascular plantproductivity. It is probably not surprising that <str<strong>on</strong>g>the</str<strong>on</strong>g> bivalveshave such a large potential c<strong>on</strong>tributi<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> S. anglica to <str<strong>on</strong>g>the</str<strong>on</strong>g>irdiets. Spartina was also a locally important dietary sourcefor <str<strong>on</strong>g>the</str<strong>on</strong>g> mussel Geukensia demissa when sampled fromwithin a salt marsh tidal channel (Peters<strong>on</strong> et al. 1985,1986). In Padilla Bay, Washingt<strong>on</strong> <str<strong>on</strong>g>the</str<strong>on</strong>g> importance <str<strong>on</strong>g>of</str<strong>on</strong>g> locallyabundant productivity sources also has been described forMytilus edulis (Ruckelshaus et al. 1993).Like Spartina alterniflora in Willapa Bay, Washingt<strong>on</strong>(Ruesink et al. 2006), S. anglica produces biomassthroughout <str<strong>on</strong>g>the</str<strong>on</strong>g> growing seas<strong>on</strong> that senesceces during <str<strong>on</strong>g>the</str<strong>on</strong>g>autumn and over winter. Thus, S. anglica adds copiousamounts <str<strong>on</strong>g>of</str<strong>on</strong>g> wrack to intertidal habitats. Release <str<strong>on</strong>g>of</str<strong>on</strong>g> biomassinto <str<strong>on</strong>g>the</str<strong>on</strong>g> estuary as a c<strong>on</strong>sequence <str<strong>on</strong>g>of</str<strong>on</strong>g> c<strong>on</strong>trol efforts may alsoc<strong>on</strong>tribute to <str<strong>on</strong>g>the</str<strong>on</strong>g> high levels <str<strong>on</strong>g>of</str<strong>on</strong>g> S. anglica in bivalve diets atWest Pass. The West Pass area c<strong>on</strong>tains <str<strong>on</strong>g>the</str<strong>on</strong>g> greatestc<strong>on</strong>centrati<strong>on</strong>s <str<strong>on</strong>g>of</str<strong>on</strong>g> S. anglica in Washingt<strong>on</strong> (Hacker et al.2001) and has been subjected to intense c<strong>on</strong>trol efforts. In2003, West Pass and its envir<strong>on</strong>s were intensively c<strong>on</strong>trolledvia applicati<strong>on</strong>s <str<strong>on</strong>g>of</str<strong>on</strong>g> herbicide as well as mowing. Thesec<strong>on</strong>trol treatments kill Spartina during <str<strong>on</strong>g>the</str<strong>on</strong>g> growing seas<strong>on</strong>and produce Spartina wrack much earlier than typicalsenescence. The less recalcitrant Spartina tissue that diesprematurely due to c<strong>on</strong>trol activity enters <str<strong>on</strong>g>the</str<strong>on</strong>g> food web up t<str<strong>on</strong>g>of</str<strong>on</strong>g>our to five m<strong>on</strong>ths earlier than is typical. This plant tissuemay <str<strong>on</strong>g>the</str<strong>on</strong>g>n decay faster during <str<strong>on</strong>g>the</str<strong>on</strong>g> warmer summer and earlyfall m<strong>on</strong>ths. By March, <str<strong>on</strong>g>the</str<strong>on</strong>g> Spartina isotopic signaturewould be fully incorporated into c<strong>on</strong>sumer tissue.The c<strong>on</strong>tributi<strong>on</strong>s to bivalve diets in this study duringMarch 2003 are subject to some sampling limitati<strong>on</strong>s. Thelack <str<strong>on</strong>g>of</str<strong>on</strong>g> samples <str<strong>on</strong>g>of</str<strong>on</strong>g> benthic diatoms and SPOM unfortunatelyexcludes productivity sources that should logicallyc<strong>on</strong>tribute to bivalve diets. However, additi<strong>on</strong>al stableisotope ratio data from West Pass collected later in 2003using δ 13 C, δ 15 N, and δ 34 S provide additi<strong>on</strong>al evidence for<str<strong>on</strong>g>the</str<strong>on</strong>g> c<strong>on</strong>sumpti<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> S. anglica by bivalves (Hellquist 2005).These data indicate that <str<strong>on</strong>g>the</str<strong>on</strong>g>re are seas<strong>on</strong>al patterns <str<strong>on</strong>g>of</str<strong>on</strong>g> S.anglica use in bivalve diets (Hellquist 2005). However,during <str<strong>on</strong>g>the</str<strong>on</strong>g>se two additi<strong>on</strong>al sampling periods that includesamples <str<strong>on</strong>g>of</str<strong>on</strong>g> sest<strong>on</strong>ic and benthic producti<strong>on</strong>, <str<strong>on</strong>g>the</str<strong>on</strong>g> dietary role<str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g>se sources was unexpectedly inc<strong>on</strong>clusive (Hellquist2005).The calculati<strong>on</strong>s <str<strong>on</strong>g>of</str<strong>on</strong>g> IsoSource greatly enhance ourability to estimate source c<strong>on</strong>tributi<strong>on</strong>s where <str<strong>on</strong>g>the</str<strong>on</strong>g>re are moresources than elements analyzed (Phillips 2001; Phillips andGregg 2003). However, it is crucial to remember that <str<strong>on</strong>g>the</str<strong>on</strong>g>semixing models should be viewed as an index <str<strong>on</strong>g>of</str<strong>on</strong>g> dietaryc<strong>on</strong>sumpti<strong>on</strong>, and not discrete point estimates (Ben-Davidand Schell 2001; Phillips and Gregg 2003). The uncertaintyassociated with <str<strong>on</strong>g>the</str<strong>on</strong>g> dietary estimates generated by IsoSource(Table 1) reinforces <str<strong>on</strong>g>the</str<strong>on</strong>g> inexact nature <str<strong>on</strong>g>of</str<strong>on</strong>g> isotopic data incases where <str<strong>on</strong>g>the</str<strong>on</strong>g>re are multiple productivity sources withsimilar isotopic ratios and where c<strong>on</strong>sumer omnivory isprevalent.Al<strong>on</strong>g with Hahn (2003), Hellquist (2005), and Ruesinket al. (2006), this research illustrates how ecosystemprocesses in Washingt<strong>on</strong> estuaries can be altered by invasiveplant species including Zostera jap<strong>on</strong>ica, S. anglica, and S.alterniflora. To our knowledge, this study is <str<strong>on</strong>g>the</str<strong>on</strong>g> first use <str<strong>on</strong>g>of</str<strong>on</strong>g>multiple stable isotope ratios to examine trophicrelati<strong>on</strong>ships in Puget Sound in relati<strong>on</strong> to invasive Spartina.This study provides evidence that bivalves living in- 157 -
Chapter 3: Ecosystem Effects <str<strong>on</strong>g>of</str<strong>on</strong>g> <strong>Invasive</strong> Spartina<str<strong>on</strong>g>Proceedings</str<strong>on</strong>g> <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> <str<strong>on</strong>g>Third</str<strong>on</strong>g> <str<strong>on</strong>g>Internati<strong>on</strong>al</str<strong>on</strong>g> <str<strong>on</strong>g>C<strong>on</strong>ference</str<strong>on</strong>g> <strong>on</strong> <strong>Invasive</strong> Spartinaimmediate proximity to invasive S. anglica are using itsbiomass as a source <str<strong>on</strong>g>of</str<strong>on</strong>g> nutriti<strong>on</strong> during winter m<strong>on</strong>ths. As arelatively new additi<strong>on</strong> to <str<strong>on</strong>g>the</str<strong>on</strong>g> estuarine flora <str<strong>on</strong>g>of</str<strong>on</strong>g> nor<str<strong>on</strong>g>the</str<strong>on</strong>g>rnPuget Sound, not <strong>on</strong>ly is S. anglica a productivity sourcethat was previously absent, but it is also an ecosystemengineer that will eventually alter sediment c<strong>on</strong>diti<strong>on</strong>s to <str<strong>on</strong>g>the</str<strong>on</strong>g>detriment <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> bivalve populati<strong>on</strong>s that currently use itsbiomass for nutriti<strong>on</strong> (Hellquist 2005).ACKNOWLEDGMENTSFunding for this study was provided by: <str<strong>on</strong>g>the</str<strong>on</strong>g> UnitedStates Envir<strong>on</strong>mental Protecti<strong>on</strong> Agency (US EPA) Office<str<strong>on</strong>g>of</str<strong>on</strong>g> Research and Development, Nati<strong>on</strong>al Center forEnvir<strong>on</strong>mental Research, Science to Achieve Results(STAR) Fellowship for Graduate Envir<strong>on</strong>mental Study toCEH; <str<strong>on</strong>g>the</str<strong>on</strong>g> Estuarine Reserves Divisi<strong>on</strong>, Office <str<strong>on</strong>g>of</str<strong>on</strong>g> Ocean andCoastal Resource Management, Nati<strong>on</strong>al Ocean Service,Nati<strong>on</strong>al Oceanic and Atmospheric Administrati<strong>on</strong>, Nati<strong>on</strong>alEstuarine Research Reserve System Graduate StudentFellowship (NA07OR0262) at <str<strong>on</strong>g>the</str<strong>on</strong>g> Padilla Bay Nati<strong>on</strong>alEstuarine Research Reserve (PBNERR), Mt. Vern<strong>on</strong>, WA toCEH; <str<strong>on</strong>g>the</str<strong>on</strong>g> Washingt<strong>on</strong> State University (WSU) School <str<strong>on</strong>g>of</str<strong>on</strong>g>Biological Sciences Betty W. Higinbotham Trust. We arealso very grateful to <str<strong>on</strong>g>the</str<strong>on</strong>g> University <str<strong>on</strong>g>of</str<strong>on</strong>g> Idaho Stable IsotopeLaboratory (John Marshall and Robert Brander) and Iso-Analytical, Ltd (Sandbach, Cheshire, UK) for sampleanalysis. R. Dave Evans (WSU) provided essentiallaboratory logistical support. D<strong>on</strong>ald Phillips (US EPA,Corvallis, OR) provided critical advice and helpfuldiscussi<strong>on</strong> for IsoSource analyses. Denise Howe, SvenNels<strong>on</strong>, and Justin Snider provided assistance with samplepreparati<strong>on</strong>. Doug Bulthuis and Shar<strong>on</strong> Riggs (PBNERR)provided logistical support throughout this research. 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FORWARD & ACKNOWLEDGEMENTSThe <stro
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TABLE OF CONTENTSForward & Acknowle
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Community Spartina Education and St
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CHAPTER ONESpartina Biology
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Chapter 1: Spartina Biology
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Chapter 2: Spartina Distribution an
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Chapter 4: Spartina Control and Man
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