International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.5, 208-217 http://ecoevopublisher.com/index.php/ijmec 210 The evolutionary genomics of species' responses to climate change further highlights the importance of considering genetic adaptation in response to salinity changes. By incorporating genomic data into predictive models, researchers can better understand how crustaceans will respond to altered salinity regimes, which is critical for their conservation and management (Waldvogel et al., 2020; Aguirre-Liguori et al., 2021). These insights underscore the need for comprehensive genomic studies to elucidate the adaptive mechanisms underlying osmoregulation in crustaceans. 2.5 Extreme weather events and habitat disruptions Extreme weather events, such as storms and hurricanes, can lead to habitat disruptions that impact crustacean populations. These events can cause physical damage to habitats, alter food availability, and increase exposure to predators. The ability of crustaceans to adapt to such disruptions is influenced by their genetic diversity and phenotypic plasticity. For instance, species with high genetic variation and adaptive potential, like the invasive green crab, may be better equipped to cope with habitat changes induced by extreme weather (Tepolt and Palumbi, 2020). Conversely, species with limited genetic diversity, such as the Antarctic krill, may face greater challenges in adapting to habitat disruptions, potentially leading to population declines (Choquet et al., 2023). Understanding the genetic basis of adaptation to extreme weather events is crucial for predicting the resilience of crustacean populations and developing effective conservation strategies. Integrating genomic data into climate models can enhance predictions of how crustaceans will respond to habitat disruptions, ultimately aiding in their preservation in a changing climate. 3 Genomic Mechanisms Underlying Crustacean Adaptation 3.1 Genetic variability and adaptive potential in crustacean populations Genetic variability is a cornerstone of adaptive potential in crustacean populations, allowing them to respond to environmental changes such as climate change. In the tidepool copepod Tigriopus californicus, studies have shown significant local adaptation to temperature, with limited genetic variation within populations for thermal tolerance. This suggests that while some populations have adapted to specific thermal conditions, their overall capacity for further adaptation is constrained by the existing genetic variability (Kelly et al., 2012). Similarly, research on the invasive green crab, Carcinus maenas, has identified a genomic island of divergence associated with temperature adaptation, indicating that even in species with high dispersal potential, local adaptation can occur rapidly in response to environmental pressures (Tepolt and Palumbi, 2020). In contrast, the Antarctic krill Euphausia superba exhibits lower genetic variation and slower rates of adaptive evolution compared to other krill species, which may limit its adaptive potential to rapid climate change. This highlights the importance of genetic diversity in enabling species to cope with changing environments and suggests that species with limited genetic variability may be at greater risk under climate change scenarios (Choquet et al., 2023). These findings underscore the need for conservation strategies that maintain or enhance genetic diversity to support the adaptive potential of crustacean populations. 3.2 The Role of Epigenetics in Climate Adaptation Epigenetic mechanisms, such as DNA methylation and histone modification, play a crucial role in the adaptation of crustaceans to climate change by regulating gene expression in response to environmental stressors. In the estuarine oyster Crassostrea ariakensis, strong selection signals were detected in genes responding to temperature and salinity stress, with evidence of selection favoring plasticity in upstream regulatory regions that modulate transcription (Li et al., 2021). This suggests that epigenetic modifications can enhance phenotypic plasticity, allowing organisms to adjust to rapidly changing environments without requiring genetic changes. Moreover, the study of Shinkaia crosnieri, a deep-sea squat lobster, revealed that stress response and immune-related genes were differentially expressed between populations inhabiting hydrothermal vents and cold seeps. This differential gene expression, potentially mediated by epigenetic mechanisms, indicates that epigenetic regulation may facilitate adaptation to diverse and extreme environments by enabling rapid and reversible changes
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