Presentation on theme: "Whos eating what, how and where? Polychaete feeding behavior and geographical distribution in the Gulf of Mexico. Russell Carvalho, Anja Schulze Texas."— Presentation transcript:
Whos eating what, how and where? Polychaete feeding behavior and geographical distribution in the Gulf of Mexico. Russell Carvalho, Anja Schulze Texas A & M University at Galveston. Results on Diversity analysis Table 2. One-way ANOVA showing correlations for depth v/s guild types based on the total number of species for each group. dfSSMSFP Group 1 Guild514825962965192.310.053 Error708977782128254 Total7510460378 Group 2 Guild633715465619249.89<.0001 Error80454660456833 Total867918151 Group 4 Guild416999284249820<.0001 Error75138776618504 Total793087694 Group 5 Guild5789065415781310<.0001 Error2400 Total297890654 Group 6 Guild5244508489028.79<.0001 Error633503615561 Total68594869 Group 7 Guild4415827281039568234.62<.0001 Error4914712298300251 Total5356295026 Guild91113679412374224.08<.0001 Error12738530312303388 Total13649667106 Group 12 Guild34811372160379122.02<.0001 Error36262223372840 Total397433604 The degrees of freedom (DF), sums of squares (SS) and mean square (MS) for each variance component is shown. The variance ratio is given by F (test statistic) and its significance is shown by the p value. Table 1. Polychaete feeding-guilds as described in Fauchald and Jumars (1979). Major Feeding mode Types of Motility motile discretely motilesessile Burrowers jawed pharynxBMJ-BSX unarmed pharynxBMX Carnivores jawed pharynxCMJCDJ- unarmed pharynxCMX-- Filter feeders tentaculate-FDTFST Herbivores--- jawed pharynxHMJ-- Omnivores jawed pharynx-ODJ- Surface deposit feeders unarmed pharynxSMXSDJ- tentaculateSMTSDTSST The feeding-guild is a three-letter code, the first letter indicates the major feeding mode, the second indicates the motility and the third indicates the morphological structure used in feeding; position 1- S, surface deposit-feeder; B, subsurface deposit-feeder; C, carnivore; F, filter-feeder; H, herbivore; position 2-M, motile; D, discretely motile; S, sessile; and position 3-P,pumping; J, jawed; T, tentaculate; X, other structures like unarmed proboscides and eversible sac-like pharynges. Fig 1 (a-c). Observe density and diversity of polychaetes in the Gulf of Mexico (a)(b)(c) Fig 2. (a) Observed percentage of feeding guilds in all samples (b) Observed feeding guilds vs no of species. (a)(b) Results on Maxent analysis Fig 3. (a) Prediction map for Aphaelochaeta marioni (b) Displays test omission rate and predicted area as a function of the cumulative threshold, averaged over 15 replicate runs. (c)The receiver operating characteristic (ROC) curve averaged over 15 replicate runs. The specificity is defined using predicted area. The average test for area under the curve (AUC) of replicate runs is 0.997, and the standard deviation is 0.001. Fig 4. Prediction map for the species (a) Spiophanes berkeleyorum (b) Tharyx annulosus and (c) Prionospio ehlersi Variable Percent Contribution Permutation Importance Sea surface temp (MAX)35.252.6 Photosynthetically available radiation (MEAN)15.412.6 pH (MEAN)10.20.3 Calcite9.80 Sea surface temp (RANGE)8.30 Sea surface temp (MIN)6.80 Phosphate3.32.3 Silicate130 Salinity00.4 Table 3. Maxent analysis of Variable Contributions to all species. (a) (b) (c) Ecological Niche Models of polychaete species in the Gulf of Mexico (a)(b)(c)
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