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Whos eating what, how and where? Polychaete feeding behavior and geographical distribution in the Gulf of Mexico. Russell Carvalho, Anja Schulze Texas.

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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:

1 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 Guild Error Total Group 2 Guild <.0001 Error Total Group 4 Guild <.0001 Error Total Group 5 Guild <.0001 Error2400 Total Group 6 Guild <.0001 Error Total Group 7 Guild <.0001 Error Total Guild <.0001 Error Total Group 12 Guild <.0001 Error Total 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 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) Photosynthetically available radiation (MEAN) pH (MEAN) Calcite9.80 Sea surface temp (RANGE)8.30 Sea surface temp (MIN)6.80 Phosphate 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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