Alterations of valve closing behavior in juvenile Catarina scallops (Argopecten ventricosus Sowerby, 1842) exposed to toxic metals

Abstract

We conducted an evaluation of alterations produced in the valve closing speed of juvenile Argopecten ventricosus (Catarina scallop) exposed to the metals cadmium, chromium and lead, because of the connection of this response to the state of health of the mollusk. Bioassays were conducted with 50 juveniles (length 3 +/- 0.5 cm) exposed to 0.02, 0.1, 0.2 mg Cd l(-1); 0.1, 0.5, 1.0 mg Cr l(-1); 0.04, 0.2, 0.4 mg Pb l(-1) and 0.8 and 1.6 mg Cd + Cr + Pb l(-1) for 480 h. The average valve closing speed at the end of the experiment was under 1 s in the control group, from 2 to 3.6 s in the bioassays with cadmium, from 1.4 to 3.4 s with chromium, from 3 to 12 s with lead, and from 12 to 15 s with the metal mixtures. It was found that there are significant differences between the values recorded in assays with metals and the control (P < 0.05). The retardation of valve closing in the organisms exposed to toxic substances is probably caused by damage to the sensory cilia located on the edge of the mantle.

In situ biomonitoring shows seasonal patterns and environmentally mediated gaping activity in the bivalve, Pinna nobilis

“…A plastic and dual circadian rhythm has been described in Crassostrea gigas (Mat et al 2012). Gaping activity also reflects behavioral patterns entrained by extrinsic factors and regulated by internal biological clocks (Palmer 2000;Ortmann and Grieshaber 2003;Sobrino-Figueroa and Caceres-Martinez 2009;Robson et al 2010). Biological activities are Abstract The rhythms and responses of animals to environmental factors are important issues for their adaptation to natural cycles.…”

Temperature regulates the switch between light-synchronized and unsynchronized activity patterns in the subtidal bivalve Pinna nobilis

“…These rhythms can be the consequence of an internal clock caused by an environmental factor (zeitgeber) or a physiological response to it (Vaze and Sharma, 2013). If both the rhythms and the relationship between the variation of environmental parameters and gaping activity are accurately understood, the gaping activity of bivalves can be used to develop effective biological early warning systems (Bae and Park, 2014;Borcherding, 2006;Liao et al, 2009;Sluyts et al, 1996;Sobrino-Figueroa and Caceres-Martinez, 2009;Sow et al, 2011). These systems can provide invaluable data and contribute to gaining a better understanding of the biology of the species monitored, but also help to understand the effects of climate change on species autoecology (Andrade et al, 2016).…”

Determinación del estado de salud de dos poblaciones de Pteria sterna presentes en sitios con diferente grado de contaminación mediante la evaluación de biomarcadores bioquímicos y genéticos

“…Algunos biomarcadores como la actividad de las enzimas AChE, GPx y el grado de lipoperoxidación, se relacionan a parámetros fisiológicos relevantes como cambios en la tasa de respiración, alimentación, crecimiento y excreción, además de cambios en la conducta de los moluscos, que determinan los efectos subletales de tóxicos (12)(13)(14) .…”

“…Por otra parte solo se han realizado algunos estudios en moluscos bivalvos presentes en la Bahía de La Paz como: Megapitaria squalida (23,24) y Argopecten ventricosus (13) en los cuales se reportan alteraciones en el factor de condición y biomarcadores bioquímicos y genéticos; como la disminución en la actividad AChE en el órgano del pie de los organismos y en el tejido de las branquias un aumento en niveles de MAD, aumento de enzimas antioxidantes: GPx, SOD y CAT, así como presencia de MN debido al daño genético. Lo anterior como resultado a la exposición a agentes tóxicos como metales pesados principalmente y HAPs introducidos a la zona costera por actividades antrópicas.…”