Physiological and Behavioural Plasticity of Arctic Marine Vertebrates Facing Rapid Sea Ice Habitat Transformation

Abstract

The rate of Arctic Warming has intensified the meltdown of the sea ice and basically altered the
makeup, size, and seasonal trends of the marine ecosystems. Sea ice is also strongly linked to arctic
oceanic vertebrates, including mammals, seabirds, and fish, to forage, breed, migrate, and evade
predation, and therefore are very vulnerable to such modifications. The paper is a review of the
available knowledge regarding the physiological and behavioral plasticity that allows the Arctic
marine vertebrates to cope with the rapid alteration in sea ice environments. This study considers
major physiological transitions, such as metabolic plasticity, thermoregulatory responses,
endocrinology of stress, energy redistribution to favor survival in novel thermal environments, and
prey dispersion. At the same time, it also studies the behaviour changes, including a shift in timing
and route of migration, and diving and foraging behaviour, a change in preference and reliance on
pelagic or coastal systems as ice-related niches are exploited. Though plasticity may provide a
temporary cushion against environmental change, this study demonstrates its limits, especially when
the melting rate of sea ice is more than the capacity of acclimating or when behavioral change
increases the cost of acclimating and the number of human-wildlife interactions. The adaptive
potential depends on species-specific differences in life history, trophic position, and sea ice
dependence, which causes uneven tax-specific resilience. Another aspect that the paper addresses is
the long-term sustainability, in terms of the vertebrate populations of the sea, of the Arctic marine
ecosystems that endure cumulative stressors, i.e., ocean warming, prey redistribution, and
anthropogenic disturbance. Physiological and behavioral plasticity are vital technologies and
constraints essential to promoting predictive systems and to sustain conservation and ecosystem-led
management of a swifter-shifting Arctic seascape.