Efeitos das mudanças climáticas na capacidade de regeneração de Platynereis dumerilii (annelida: nereididae)

Abstract

Anthropogenic climate change affects marine environments through alterations in salinity, rising temperatures, and ocean acidification. Understanding the effects of these factors on organisms is essential, although groups such as annelids remain underrepresented in research. The annelid Platynereis dumerilii stands out as an experimental model and exhibits posterior regenerative capacity, a key process following physical damage but potentially associated with fitness costs. This study evaluated the effects of projected variations in salinity, temperature, and pH, based on IPCC (2019, 2023) scenarios, on the regeneration of P. dumerilii. Temperatures of 18°C (control), 25°C, 30°C, and 33°C; salinities of 35 (control), 30, and 25; and pH values of 7.9 (control) and 7.6 were tested. Organisms with 30–40 segments and 3–4 months of age were amputated and monitored for five days, a period sufficient for complete regeneration under control conditions. Regeneration occurrence, survival, and the formation of anomalies were analysed using Generalized Linear Models. Results revealed that the regeneration of P. dumerilii is sensitive to future climate scenarios. Reduced salinity slightly delayed regeneration without affecting survival or inducing anomalies. Elevated temperature accelerated regeneration but caused anomalies at 30°C and mortality above this threshold. Lowered pH reduced survival and suggested a decelerating effect on regeneration. This study contributes to the understanding of climate change impacts on marine invertebrates and expands current knowledge on regeneration in annelids.