Chemical Tools of Octopus maya during Crab Predation Are Also Active on Conspecifics

PloS One
Dawrin Pech-PuchSergio Rodríguez-Morales

Abstract

Octopus maya is a major socio-economic resource from the Yucatán Peninsula in Mexico. In this study we report for the first time the chemical composition of the saliva of O. maya and its effect on natural prey, i.e. the blue crab (Callinectes sapidus), the crown conch snail (Melongena corona bispinosa), as well as conspecifics. Salivary posterior glands were collected from octopus caught by local fishers and extracted with water; this extract paralyzed and predigested crabs when it was injected into the third pereiopod. The water extract was fractionated by membrane ultrafiltration with a molecular weight cut-off of 3 kDa leading to a metabolic phase (>3 kDa) and a neurotoxic fraction (<3 kDa). The neurotoxic fraction injected in the crabs caused paralysis and postural changes. Crabs recovered to their initial condition within two hours, which suggests that the effects of the neurotoxic fraction were reversible. The neurotoxic fraction was also active on O. maya conspecifics, partly paralyzing and sedating them; this suggests that octopus saliva might be used among conspecifics for defense and for reduction of competition. Bioguided separation of the neurotoxic fraction by chromatography led to a paralysis fraction and a relaxi...Continue Reading

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Citations

Jul 23, 2020·Frontiers in Physiology·Katina RoumbedakisCarlos Rosas
Sep 2, 2017·Frontiers in Physiology·Roger VillanuevaGraziano Fiorito
Aug 30, 2018·Diseases of Aquatic Organisms·S Guillén-HernándezH Villegas-Hernández
Jan 23, 2020·Marine Drugs·Dawrin Pech-PuchCarlos Jiménez
Sep 18, 2018·Journal of Proteome Research·Legana C H W FingerhutIra R Cooke

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Methods Mentioned

BETA
Fluorescence
NMR
dissection
sedation
scraping
High Performance Liquid Chromatography

Software Mentioned

PERMANOVA
MSD
- Chemstation
NMDS
PRIMER

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