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Labyrinthula zosterae<\/strong>\u00a0isolation, culturing, and identification:<\/strong><\/em>\u00a0In May 2016, we isolated\u00a0L. zosterae,\u00a0<\/em>the causative agent of\u00a0Zostera<\/em>\u00a0wasting disease, from the diseased leaf tissue of live\u00a0Zostera<\/em>\u00a0from CB. Briefly, we cut a 2 centimeter section of\u00a0Zostera<\/em>\u00a0leaf tissue at the edge of a black or brown lesion, surface sterilized and rinsed the leaf tissue section, and plated the tissue onto a 10 centimeter diameter seawater agar plate (Mckone and Tanner, 2009; Muehlstein, 1988). We confirmed the identity of the culture to be\u00a0L. zosterae<\/em>\u00a0by microscopic examination (Mckone and Tanner, 2009). Specifically, we observed culture and cell morphology under 200x and 400x magnification on a Nikon eclipse 50i microscope. We used previously published examples of\u00a0L. zosterae<\/em>\u00a0culture and cell morphology as a guide (i.e. branching \u2018slime\u2019 tunnels connecting cells and fusiform cell shape; Muehlstein et al., 1991). We maintained the\u00a0L. zosterae<\/em>\u00a0culture by transferring colonized agar plugs to fresh agar plates every two weeks.<\/p>\n Zostera\u00a0<\/strong>collection and preparation:<\/strong><\/em>\u00a0In June 2016, we collected 30\u00a0Zostera<\/em>\u00a0plants (connected rhizome, stem, and leaves) from the same four subpopulations we surveyed wasting disease: NB (Niles Beach, Gloucester, 42\u00b0 35.8268\u2019 N, 70\u00b0 39.3553\u2019 W), WB (West Beach, Beverly, 42\u00b0 33.9155\u2019 N, 70\u00b0 47.1102), LP (Lynch Park, Beverly, 42\u00b0 32.6925\u2019 N, 70\u00b0 51.5057\u2019 W), and CB (Curlew Beach, Nahant, 42\u00b0 25.2378\u2019 N, 70\u00b0 54.9474\u2019 W).<\/p>\n At each subpopulation location, we collected\u00a0Zostera<\/em>\u00a0plants at 1 m intervals along a 30 m transect running parallel to shore 2-5 m from the shoreward extent of the\u00a0Zostera\u00a0<\/em>bed at a depth of 1-2 meters MLLW. Plants from each subpopulation were kept in separate flow-through 54 liter seawater holding tanks in a glasshouse at the Northeastern University Marine Science Center (MSC), Nahant, MA. We attached the rhizome of each plant to a weight with a zip-tie so that the plants were oriented naturally in the water column and did not float on the top of the mesocosms (Mckone and Tanner, 2009). We allowed the plants to acclimate to greenhouse conditions for one month before the start of the\u00a0L. zosterae\u00a0<\/em>inoculation experiment.<\/p>\n Ten days prior to inoculating\u00a0Zostera<\/em>\u00a0with\u00a0L. zosterae<\/em>, we haphazardly selected 22 plants from each subpopulation and moved them from the flow-through holding tanks into 88 45 centimeter tall and 15 centimeter diameter transparent cylindrical acrylic mesocosms filled with seawater. Immediately prior to isolating each plant in a mesocosm, we used a razor blade to remove all leaf tissue within 3 centimeters of any black and brown lesions characteristic of wasting disease infection. In addition, we clipped the rhizomes of each plant to a length of 5 centimeters from the first node and removed all secondary shoots. We sterilized our workspace and tools with 10% bleach and then rinsed with deionized (DI) water in between handling each plant in order to minimize the risk of cross-contamination.<\/p>\n We assigned the 88 mesocosms to eleven 54 liter tanks in the MSC glasshouse such that each tank held two\u00a0Zostera<\/em>\u00a0from each subpopulation. We randomized the location of the mesocosms within each tank. We then supplied each tank with flow-through seawater to a depth of 3-5 centimeters below the top of the mesocosms. The flow-through seawater acted as a water bath, keeping the temperature of the water in the mesocosms equivalent to ambient conditions. Finally, we added air-stones to each mesocosm to circulate the water and prevent temperature gradients from forming.<\/p>\n Vector preparation:<\/strong><\/em>\u00a0One week prior to inoculating\u00a0Zostera<\/em>\u00a0with\u00a0L. zosterae<\/em>, we collected lesion-free\u00a0Zostera<\/em>\u00a0leaves from the CB subpopulation. We gently cleaned epiphytes off of the leaf tissue, rinsed the leaves in DI water for five minutes, and cut the leaves into 144 2-centimeter sections. We then haphazardly distributed the leaf sections into twenty-four 1.85 milliliter (mL) glass drams filled with 1.5 milliliter (mL) seawater (six leaf sections per dram) and autoclaved them at 121\u00b0C for 20 minutes to eliminate the possible presence of pathogens and to prevent contamination of inoculation cultures.<\/p>\n Next, we transferred the autoclaved leaf tissue sections onto 24 10-centimeter diameter seawater agar plates (six leaf sections per plate) (Mckone and Tanner, 2009). We arranged the leaf sections in a circle with a radius of 3 centimeters around the center of each agar plate and 1 centimeter distance maintained between each leaf section. We sealed the first twelve plates with parafilm immediately after plating on leaf sections and used these plates as control vectors. After plating leaf sections on the remaining twelve agar plates, we inoculated each plate by placing a 1 x 1 cm agar plug cut from the growing edge of the axenic\u00a0L. zosterea<\/em>\u00a0culture isolated in May 2016 and maintained in the lab as described above. We then sealed these plates with parafilm to use as disease vectors. We stored all vectors in ambient light at 22\u00b0C in a fume hood.<\/p>\n We visually inspected the control and disease vectors daily for signs of contamination. For the\u00a0L. zosterae<\/em>-inoculated plates, we also monitored the expansion of\u00a0L. zosterae<\/em>\u00a0across the surface of the agar. Three days following plating, we observed\u00a0L. zosterae<\/em>\u00a0cells beginning to spread over the vectors and by the seventh day,\u00a0L. zosterae<\/em>\u00a0cells completely covered the vectors in all twelve of the inoculated plates.<\/p>\n Zostera<\/strong>\u00a0inoculation:<\/strong><\/em>\u00a0We inoculated all 88 plants (N=22 per subpopulation) on August 2, 2016 (experiment day 0). We haphazardly selected eleven plants from each subpopulation to inoculate with a control vector and we inoculated the other eleven plants from each subpopulation with a disease vector. We first inoculated all the plants receiving the control treatment and then inoculated all the plants receiving the disease treatment to minimize the risk of contaminating the control plants with\u00a0L. zosterae<\/em>.<\/p>\n To inoculate each plant, we first gently removed the plant from its mesocosm and placed it on a 2 x 0.25 meter laminated paper surface. We used forceps to remove a single vector from an agar plate and placed it on the surface of the 2nd youngest leaf 5 centimeters above the top of the sheath. We clamped the vector to the leaf with a sterilized, rigid split Tygon tube (1 x 0.5 centimeters in diameter) (Muehlstein, 1988) and returned the inoculated plant back into its respective container. To prevent cross-contamination, we rinsed the working surface and forceps with 10% bleach and then DI water between each plant.<\/p>\n Monitoring and breakdown:<\/strong><\/em>\u00a0We monitored the progression of wasting disease lesions as well as\u00a0Zostera<\/em>\u00a0survival, growth, and morphology eight times over the course of the one-month experiment (days 0, 1, 3, 5, 7, 14, 21, and 28). We visually assessed each plant for the production of secondary shoots (stems and leaves) and noted plant mortality. We then photographed each plant using the camera application on an iPhone 5s. To prevent cross-contamination, we photographed all control plants before plants receiving the disease treatment and disinfected the working surface and all tools as described above between each plant. On day 28, we concluded the experiment by removing all plants from their mesocosms, taking photographs, measuring rhizome length, and recording biomass of above- and below-ground tissues after 48 hours drying at 70 \u00baC.<\/p>\n We quantified\u00a0Zostera<\/em>\u00a0growth, morphology, and wasting disease infection intensity by scoring each photograph using the free ImageJ software for Mac OS X developed by the National Institutes of Health (Schneider et al., 2012). Specifically, we quantified leaf loss and leaf production for each plant over the course of the experiment by counting the number of leaves present relative to the position of the inoculated leaf (i.e., decrease in number of older leaves and increase in number of younger leaves). We used the segmented line function to measure the length of each leaf from the top of the sheath to the leaf tip. We calculated leaf growth as the change in length of the youngest leaf present at the time of inoculation, accounting for changes in sheath length. We used the polygon function to quantify leaf area and lesion area for each leaf. We used published descriptions and photographs of lesions associated with wasting disease to identify lesion area (Burdick et al., 1993; Groner et al., 2014; Groner, Burge, et al., 2016). To quantify the severity of wasting disease infection, we divided the sum of lesioned tissue area by the sum of total leaf tissue area for each plant (Burdick et al., 1993).<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/ocean-data.org\/schema\/hasBriefDescription":[{"@value":"Seagrass Responses from Mesocosm Experiment","@language":"en-US"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"Seagrass Responses from Mesocosm Experiment","@type":"xsd:string"}],"http:\/\/ocean-data.org\/schema\/hasProcessingDescription":[{"@value":" Statistical analyses:\u00a0<\/strong><\/em> y = ai(1 - b*exp(-ci * t)) (eqn. 1)<\/em><\/p>\n We chose this model to separately capture the initial progression of wasting disease lesion severity (parameter\u00a0ci<\/em>) and the asymptotic severity levels realized in the final weeks of the experiment (parameter\u00a0ai<\/em>). We applied simulated annealing (SA), a global optimization procedure for minimizing a cost function, to fit a monomolecular function constructed in R to the experimental lesion severity data from each infected plant that survived the duration of the experiment (Kirkpatrick et al., 1983). We chose SA because it is robust against local minimums and requires no prior constraints on parameter values. Our SA procedure consisted of a cost function, which calculates the root mean square error of the model relative to the data to measure the quality of the model fit, and a \u2018temperature\u2019 schedule, which represents the probability of accepting the proposed parameter values (ai<\/em>\u00a0and\u00a0ci<\/em>) if they result in a worse fit than the current parameter values (ai-1<\/em>\u00a0and\u00a0ci-1<\/em>) at each iteration. We began the procedure by selecting a random set of parameter values, defined the initial temperature\u00a0Tc<\/em>\u00a0as 10^8, the rate of decay\u00a0Tr<\/em>\u00a0as 20, and ran the procedure for 10^4 iterations. From this SA procedure, we determined the values of parameters\u00a0a<\/em>\u00a0and\u00a0c<\/em>\u00a0associated with the best fit of the monomolecular model to the experimental data for each plant. We used a one-way ANOVA to examine the effect of subpopulation on the value of parameter\u00a0a<\/em>\u00a0and in the case of significant effects, we used Tukey HSD post hoc tests to differentiate among subpopulations. We used non-parametric Kruskal-Wallace tests to examine the effect of subpopulation on the value of parameter\u00a0c\u00a0<\/em>due to non-normality.<\/p>\n To address whether differences in the progression or asymptote of wasting disease severity (the sum of lesioned tissue area divided by the sum of leaf tissue area) aligned with differences in the progression of wasting disease lesions (sum of lesioned tissue area), we used a function describing the logistic growth of wasting disease lesions over the course of the experiment (Madden et al., 2007).<\/p>\n dN\/dt = riN(1 \u2013 N\/ki) (eq. 2)<\/em><\/p>\n We chose a logistic growth function to model wasting disease lesion progression because we assume that lesion progression is the visual expression of the population growth of\u00a0L. zosterae<\/em>\u00a0within the seagrass host (Bergmann et al., 2011; Bockelmann et al., 2013). We used vector area (mean \u00b1 SE cm^2 = 0.804 \u00b1 0.014) as the initial lesion area value in the logistic growth models. We used the SA procedure described above to fit the logistic growth function, constructed as an ordinary differential equation using the deSolve package in R (Soetaert et al., 2010), to the experimental lesion area data and determine values for the intrinsic rate of increase of lesions area (ri<\/em>) and the per plant lesion area carrying capacity (ki<\/em>) for each infected plant that survived the duration of the experiment. We then used a one-way ANOVA to examine the effect of subpopulation on parameter\u00a0k<\/em>\u00a0and a non-parametric Kruskal-Wallace test to examine the effect of subpopulation on parameter\u00a0r<\/em>\u00a0due to non-normality.<\/p>\n Host Response (Multivariate):<\/em>\u00a0We used PERMANOVA from the vegan package in R (Oksanen et al., 2019) to assess the independent and interactive effects of subpopulation and inoculation treatment on\u00a0Zostera<\/em>\u00a0response to inoculation in multivariate space. We excluded eight\u00a0Zostera<\/em>\u00a0replicates from the control group that developed lesions characteristic of wasting disease infection during the experiment and seven additional replicates that died over the course of the experiment. (We examine the effects of subpopulation and inoculation treatment on\u00a0Zostera<\/em>\u00a0survival in separate analyses described below.) We used the Euclidean method to calculate pairwise distances among subpopulation and infection treatment combinations. Prior to running the PERMANOVA, we scaled the data and tested eight responses (leaf production, leaf loss, leaf growth, rhizome growth, reduction in sheath length, final aboveground biomass, final belowground biomass, and final total biomass) for collinearity using the corrgram package in R (Wright, 2018). We excluded final aboveground biomass and final belowground biomass from the analysis due to correlations greater than 0.75 with final total biomass. To test whether the effects of subpopulation and inoculation treatment on\u00a0Zostera<\/em>\u00a0responses correlated with initial\u00a0Zostera<\/em>\u00a0traits, we ran a second PERMANOVA analysis where we tested four traits measured at the time of inoculation (initial leaf number, initial shoot length, initial maximum leaf length, and initial sheath length). Initial rhizome length was standardized to 5 cm in all\u00a0Zostera<\/em>\u00a0prior to inoculation and thus was excluded from this analysis. Data were scaled and initial shoot length was excluded due to correlations greater than 0.75 with initial leaf length.<\/p>\n When PERMANOVAs indicated a significant main effect of subpopulation or interactive effect of subpopulation by inoculation, we used multiple paired PERMANOVA post hoc contrasts, adjusted using Bonferroni corrections, to parse out the differences among treatments. Other correction factors (i.e., Benjamini & Hochberg false discovery rate method; Benjamini & Hochberg 1995) yielded similar results. We visualized the results of PERMANOVAs through principal component analyses run using the stats and ggbiplot packages in R (Vu, 2011; R Core Team, 2019).<\/p>\n Host Response (Univariate):<\/em>\u00a0We examined survival and secondary shoot production in separate analyses due to their binomial distributions. Specifically, we used log-rank tests of Kaplan-Meier curves to examine independent effects of inoculation treatment and subpopulation on\u00a0Zostera<\/em>\u00a0survival. Survival analyses were run using the survival and survminer packages in R (Therneau & Grambsch, 2000; Therneau, 2015; Kassambara et al., 2019).\u00a0Zostera<\/em>\u00a0from two subpopulations, CB and WB, produced no secondary shoots and thus were excluded from formal analyses due to lack of variance. We used a generalized linear model to examine the independent and interactive effects of inoculation treatment and subpopulation on\u00a0Zostera<\/em>\u00a0shoot production for the remaining two subpopulations, LP and NB. In addition, we examined the eight\u00a0Zostera<\/em>\u00a0responses and four initial\u00a0Zostera<\/em>\u00a0traits considered in the PERMANOVA analyses independently using two-way ANOVAs in order to determine how each was affected by subpopulation and infection treatment. We used Tukey honest significant difference (HSD) post hoc tests to interpret significant effects from ANOVAs as needed.<\/p>\n We conducted all analyses in R (version 3.6.1; R Core Team, 2019) and Rstudio (version 1.1.463; Rstudio Team, 2016).<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/purl.org\/dc\/terms\/identifier":[{"@value":"851047","@type":"xsd:int"}],"http:\/\/purl.org\/dc\/terms\/title":[{"@value":"Seagrass Responses from Mesocosm Experiment"}],"http:\/\/purl.org\/dc\/terms\/date":[{"@value":"2021-04-29T14:24:21-04:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/created":[{"@value":"2021-04-29T14:24:21-04:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/modified":[{"@value":"2023-07-07T16:10:26-04:00","@type":"xsd:dateTime"}],"http:\/\/rdfs.org\/ns\/void#inDataset":[{"@id":"http:\/\/www.bco-dmo.org\/"}],"http:\/\/ocean-data.org\/schema\/namedGraph":[{"@value":"urn:bcodmo:dataset:851047","@type":"xsd:token"}],"http:\/\/ocean-data.org\/schema\/osprey_page":[{"@id":"https:\/\/www.bco-dmo.org\/dataset\/851047"}],"http:\/\/ocean-data.org\/schema\/identifier":[{"@value":"_:Identifier851047"}],"http:\/\/ocean-data.org\/schema\/datasetTitle":[{"@value":"Seagrass responses to Labyrinthula zosterae inoculation base on a subpopulation from mesocosm experiments conducted in Nahant, Massachusetts","@language":"en-US"}],"http:\/\/ocean-data.org\/schema\/abstract":[{"@value":"This dataset includes seagrass responses to Labyrinthula zosterae inoculation base on a subpopulation from mesocsm experiments conducted in a greenhouse at Northeastern University Marine Science Center in Nahant, Massachusetts from May to August 2016.","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/rights":[{"@id":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"http:\/\/ocean-data.org\/schema\/deprecated":[{"@value":"false","@type":"xsd:boolean"}],"http:\/\/ocean-data.org\/schema\/temporalExtent":[{"@value":"_:temporalExtent851047"}],"http:\/\/ocean-data.org\/schema\/spatialCoverage":[{"@value":"_:spatialCoverage851047"}],"http:\/\/purl.org\/dc\/terms\/bibliographicCitation":[{"@value":"Hughes, A. 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Wasting disease:<\/em>\u00a0We chose a monomolecular model commonly used to describe the progression of disease severity in plants to assess the nonlinear change in wasting disease severity on individual\u00a0Zostera<\/em>\u00a0as a function of time over the course of the experiment (Gilligan, 1990; Madden et al., 2007).<\/p>\n