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AChE and EROD activities in two echinoderms, Holothuria leucospilota and Holoturia atra (Holothuroidea), in a coral reef (Reunion Island, South-western Indian Ocean)

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TLDR
This study is the first of its kind performed in the coastal waters of Reunion Island and data obtained represent reference values, and a significant relationship was found between AChE activity and Cuvierian tubules time of expulsion in Holothuria leucospilota.
Abstract
AChE and EROD activities were investigated in two holothurian species, Holothuria leucospilota and Holoturia atra, from a tropical coral reef. These organisms were collected from 3 back-reef stations, where temperature and salinity were homogeneous. The activity levels of both AChE and EROD varied significantly between the two species, but were in the range of values determined in other echinoderm species. AChE activity levels were higher in the longitudinal muscle than in the tentacle tegument. Among the several tissues tested, the digestive tract wall exhibited higher EROD activity levels. Sex did not influence AChE and EROD activity levels in both species. Animal biomass and EROD activity levels were only correlated in the tegument tissue of H. atra, and we hypothesize a possible influence of age. EROD activity did not show intraspecific variability. A significant relationship was found between AChE activity and Cuvierian tubules time of expulsion in Holothuria leucospilota. Individuals collected at the southern site presented both lower AChE activity levels and Cuvierian tubules time of expulsion, indicating possible neural disturbance. More information on holothurians biology and physiology is needed to further assess biomarkers in these key species. This study is the first of its kind performed in the coastal waters of Reunion Island and data obtained represent reference values.

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Sources of particulate organic matter at the ecosystem scale: a stable isotope and trace element study in a tropical coral reef

TL;DR: In this article, the spatial and seasonal variability of sources of particulate organic matter (POM) were evaluated in a coral reef ecosystem, and stable isotope composition (δ 13 C, δ 15 N) was determined in oceanic, riverine and reef water POM.
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Humoral responses during wound healing in Holothuria tubulosa (Gmelin, 1788).

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Characterization of acetylcholinesterase from the gut of sea cucumber Stichopus japonicus

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Clonal structure through space and time: High stability in the holothurian Stichopus chloronotus (Echinodermata).

TL;DR: This is the first time that clonal structure in sea cucumbers has been studied at such a fine scale, with a specific sampling strategy, which provides key findings on the genetic diversity and structure of fissiparous sea cucumber populations, which will be useful for the management of wild populations and aquaculture.
References
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Journal Article

Ethoxyresorufin: direct fluorimetric assay of a microsomal o-dealkylation which is preferentially inducible by 3-methylcholanthrene

TL;DR: Liver microsomes from rat and hamster O-deethylated ethoxyresorufin to resoruf in (7-hydroxyphenoxazone) in an NADPH-and oxygen-dependent reaction involving the flavoprotein.
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