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- Title
Carapace shape differences between subterranean and aboveground populations of Macrobrachium sp. from Marinduque, Philippines.
- Authors
Mascareñas, Doreen R.; Torres, Mark Anthony J.
- Abstract
Morphological variations in the carapace structure of the freshwater shrimp Macrobrachium sp. collected from the subterranean and aboveground river systems in Marinduque, Philippines were studied using geometric morphometric analysis. Sixteen (16) landmarks were established on the carapace structure of the samples using the MorphoJ software. Variations in carapace shape of the samples were explored using Principal Component Analysis (PCA) and translated to Procrustes coordinates. To compare the differences in carapace shape between the samples, pairwise permutation test Canonical Variate Analysis (CVA) was applied with 10,000 permutations. Discriminate analysis was also used to determine significant difference on the carapace shape. To determine manifestations of allometry, multivariate regression was employed with log of the centroid size as the independent variable and Procrustes coordinate as dependent variable (with 10,000 permutations). Results of the PCA showed some indications of variation in the shape of the carapace that occurred mostly on the rostrum, where the subterranean shrimps generally have longer rostrum, and the aboveground shrimps having a broader rostrum. It also showed that the aboveground samples have a broader carapace compared to that of the subterranean samples. Procrustes pairwise permutation tests using CVA between the carapace shapes of shrimps from the subterranean and aboveground rivers showed a significant difference (Procrustes distance= 0.0418, p=0.0022). Results of the discriminate analysis also showed that carapace of shrimps from the subterranean and aboveground rivers significantly differ (T-square= 3790.74, P-value [parametric] = 0.0064). The multivariate regression showed that the subterranean shrimp samples exhibited allometric relationship between the carapace shape and the long centroid while the aboveground samples did not exhibit allometric relationship. The significant allometry in subterranean shrimps is an indication that the population has a different growth pattern compared to that of aboveground river shrimps population.
- Subjects
MARINDUQUE (Philippines); UNDERGROUND ecology; MACROBRACHIUM; MORPHOMETRICS; MULTIPLE correspondence analysis (Statistics)
- Publication
Extreme Life, Biospeology & Astrobiology, 2016, Vol 8, Issue 1, p27
- ISSN
2066-7671
- Publication type
Article