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Title: Effects of vessel traffic and ocean noise on gray whale stress hormones

Journal Article · · Scientific Reports
 [1];  [2];  [3];  [4];  [3];  [4];  [5];  [3];  [6];  [4]
  1. Oregon State Univ., Corvallis, OR (United States); Florida International Univ. (FIU), Miami, FL (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Oregon State Univ., Corvallis, OR (United States)
  3. Seattle Aquarium, WA (United States)
  4. Oregon State Univ., Corvallis, OR (United States)
  5. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  6. George Mason Univ., Fairfax, VA (United States)

Human use of marinescapes is rapidly increasing, especially in populated nearshore regions where recreational vessel traffic can be dense. Marine animals can have a physiological response to such elevated human activity that can impact individual health and population dynamics. To understand the physiological impacts of vessel traffic on baleen whales, we investigated the adrenal stress response of gray whales (Eschrichtius robustus) to variable vessel traffic levels through an assessment of fecal glucocorticoid metabolite (fGC) concentrations. This analysis was conducted at the individual level, at multiple temporal scales (1–7 days), and accounted for factors that may confound fGC: sex, age, nutritional status, and reproductive state. Data were collected in Oregon, USA, from June to October of 2016–2018. Results indicate significant correlations between fGC, month, and vessel counts from the day prior to fecal sample collection. Furthermore, we show a significant positive correlation between vessel traffic and underwater ambient noise levels, which indicates that noise produced by vessel traffic may be a causal factor for the increased fGC. This study increases knowledge of gray whale physiological response to vessel traffic and may inform management decisions regarding regulations of vessel traffic activities and thresholds near critical whale habitats.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; Oregon Sea Grant Program; US Department of the Navy, Office of Naval Research (ONR)
Grant/Contract Number:
AC05-76RL01830; RECO-40-PD; N00014-20-1-2760
OSTI ID:
1902134
Report Number(s):
PNNL-SA-161483
Journal Information:
Scientific Reports, Vol. 12, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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