ECHINOMETRA MATHAEI PDF

This study provides a comparison of these two E. While all the analyses underline a close association between A. Chemical analyses reveal that these shrimps present the same spinochrome composition as E. Isotopic composition and pigment loss after host separation suggest that these pigments are certainly assimilated upon feeding on the urchin.

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Licence This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. Little research has been done on this genus, and to our knowledge no studies have been done on the E. To help clarify species delineations in the E.

Morphological characteristics spine color, milled rings, and skin around the peristome and tubefeet and gonad spicules were observed. Two or possibly three species of Echinometra were found in the two sites based on their morphology and spicules, namely: Echinometra sp. A, Echinometra sp. C, and Echinometra affinity C, which resembles sp. C but differs in the milled rings and gonad spicules. Echinometra sp.

C and E. Echinometra VC and Echinometra sp. A exhibited differences in abundance VC was much more common and microhabitat VC was restricted to rocky shores and never observed in coral communities.

To study the abundance and distribution of Echinometra VC, 50 m by 2 m belt transects were surveyed along the rocky shores of both sites: two parallel transects at 0 m and at 0. The transect data showed that the mean densities for 0 m and 0. Of the two sites, only Nabas showed a significant difference between the mean densities at 0 m and 0.

A Poisson regression on the perpendicular transect data from Nabas showed a trend of increasing Echinometra density with increasing distance from the shore.

In the future, DNA barcoding and cross-fertilization studies should be performed in order to confirm the species of Echinometra observed. Many factors can affect the density and distribution of Echinometra, so further studies must be conducted to explain observed differences in their distribution and abundance.

Author Comment Corrected minor error in Discussion section in the passage discussing Russo Supplemental Information Appendix A.

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Coevolution Abstract Tuleariocaris holthuisi and Arete indicus are two ectocommensal shrimps closely associated with the tropical sea urchin Echinometra mathaei. This study provides a comparison of these two E. While all the analyses underline a close association between A. Chemical analyses reveal that these shrimps present the same spinochrome composition as E. Isotopic composition and pigment loss after host separation suggest that these pigments are certainly assimilated upon feeding on the urchin. Moreover, symbiont isolation experiments demonstrate the high dependency of T. Finally, some host recognition mechanisms are investigated for T.

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Echinometra mathaei (Blainville, 1825)

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