The effects of experimental temperature increase on gametogenesis and heat stress parameters in oysters: Comparison of a temperate-introduced species (Crassostrea gigas) and a native tropical species (Crassostrea corteziensis)

Reproduction patterns of the bloody cockle Senilia senilis (Linnaeus 1758) in the Sine-Saloum inverse estuary

“…Temperature and salinity are very important factors influencing the reproductive cycle of bivalves. In tropical zones, the most intense spawning periods are frequently triggered by an increase in temperature (Rodríguez-Jaramillo et al, 2022;Jahangir et al, 2014;Ren et al, 2003;Massapina et al, 1999). In this study, the two periods of spawning were identified at temperatures around 26 °C and 24 °C (May and December), which do not correspond with the maximum temperatures observed (> 30 °C), so temperature does not seem to be the trigger for spawning of the bloody cockle in the Sine-Saloum delta.…”

Comparative study of domoic acid accumulation, isomer content and associated digestive subcellular processes in five marine invertebrate species

“…Further research is needed in order to decipher how DA exposure and its biotransformation modulate cell vacuolization, as well as its potential detrimental effects on the digestive cells of pectinids, and possibly, over other invertebrates, as reported for other phycotoxins in other bivalve species (Hegaret et al, 2010;Lassudrie et al, 2014). Furthermore, as discussed above, the highest proportions of total autophagy, and production of residual bodies reported in P. maximus, A. opercularis, and C. fornicata, seems to directly correspond to the sequestration of DA within these subcellular structures, which indicates that autophagy could be also considered as a sign of homeostatic impairment, as reported in other marine bivalve species when activated as an auxiliary mechanism for recycling internal energy to cope with detrimental environmental conditions (Moore, 2008;Rodríguez-Jaramillo et al, 2022), or to depurate toxicological agents (Moore, 2004;Picot et al, 2019). The particularly highest proportions of DA-autophagy in P. maximus analyzed here stress out the need to carry out the measurement of the frequency of these subcellular features in a DA contamination and decontamination scenario.…”

“…Scallops, P. maximus but even more so A. opercularis contaminated by DA in this study have significantly higher digestive cell vacuolization rates in their digestive gland compared to other species. Cell vacuolization is a common histopathological lesion in bivalves under stressful environmental conditions (Rodríguez-Jaramillo et al, 2022). According to Shubin et al (2016) this is a well-known subcellular phenomenon observed in animal cells which often accompanies cell death after exposure to artificial or natural low-molecular-weight compounds, such as DA.…”

“…Through autophagy the lysosomes receive autophagosomic vesicles (autophagosomes) containing cytoplasmic cellular components, such as macromolecules, damaged or misfolded proteins, and entire organelles, as well as extracellular-derived molecular cargo from endocytosis and phagocytosis for degradation, digestion, recycling, or excretion (Klionsky et al, 2014;McMillan, 2018;Wang et al, 2019). These distinctive capabilities establish an essential role of autophagy in maintaining metabolic homeostasis and cellular health in bivalves (Balbi et al, 2018;Picot et al, 2019;Rodríguez-Jaramillo et al, 2022).…”

A Global Analysis of Climate Change and the Impacts on Oyster Diseases

“…Oysters have specific temperature tolerance ranges, and when the temperature goes beyond these ranges, it can lead to stress and even mortality [114][115][116]. Exposure to high temperatures for an extended period can result in heat stress, decreased immune function, and a higher susceptibility to diseases and pathogens [117,118]. On the other hand, oysters can become susceptible to freezing or low-temperature stress when exposed to low temperatures, resulting in disease and disease-induced mortality [117].…”