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<p>Early life stages of fish are most sensitive and vulnerable to changing environmental conditions. The temperature-oxygen squeeze hypothesis has been established as a key regulator of suitable habitat for striped bass. However, the effects of cumulative exposure to high temperatures on size post-survival of their first winter are critical but poorly understood. We examined the impact of thermal and oxic habitat on striped bass length-at-age 1 for 28&#xa0;year classes (1988 to 2015) in the Hudson River Estuary (HRE). As crucial spawning, nursery, and overwintering habitat, striped bass growth in the HRE may be altered by observed increasing water temperatures and decreasing dissolved oxygen concentrations. Our degree-day index for cumulative exposure to temperatures above 20 °C had a significant positive relationship with length-at-age 1, especially at high cumulative exposures, and dissolved oxygen had a significant positive linear relationship, demonstrating the importance of thermal and oxic habitat for growth dynamics of early life stages. As many coastal and estuarine ecosystems are experiencing warming water temperatures and decreasing dissolved oxygen concentrations, research examining the effects of these changes on diadromous juvenile fish growth and therefore size at maturity, recruitment, and overall population dynamics is essential for effective assessment and management, particularly for cumulative high temperature exposure. A warming HRE over the past three decades and into the future provides the backdrop for altered striped bass growth, and we demonstrate that increased water temperatures may be a primary driver for this altered growth.</p>

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Cumulative temperature exposure as a driver of striped bass early growth in a changing thermal habitat

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Sarah E. Praisner,
  • Yong Chen

摘要

Early life stages of fish are most sensitive and vulnerable to changing environmental conditions. The temperature-oxygen squeeze hypothesis has been established as a key regulator of suitable habitat for striped bass. However, the effects of cumulative exposure to high temperatures on size post-survival of their first winter are critical but poorly understood. We examined the impact of thermal and oxic habitat on striped bass length-at-age 1 for 28 year classes (1988 to 2015) in the Hudson River Estuary (HRE). As crucial spawning, nursery, and overwintering habitat, striped bass growth in the HRE may be altered by observed increasing water temperatures and decreasing dissolved oxygen concentrations. Our degree-day index for cumulative exposure to temperatures above 20 °C had a significant positive relationship with length-at-age 1, especially at high cumulative exposures, and dissolved oxygen had a significant positive linear relationship, demonstrating the importance of thermal and oxic habitat for growth dynamics of early life stages. As many coastal and estuarine ecosystems are experiencing warming water temperatures and decreasing dissolved oxygen concentrations, research examining the effects of these changes on diadromous juvenile fish growth and therefore size at maturity, recruitment, and overall population dynamics is essential for effective assessment and management, particularly for cumulative high temperature exposure. A warming HRE over the past three decades and into the future provides the backdrop for altered striped bass growth, and we demonstrate that increased water temperatures may be a primary driver for this altered growth.