Inferring energy expenditure from respiration rates in minke whales to measure the effects of whale watching boat interactions

Fredrik Christiansen*, Marianne H. Rasmussen, David Lusseau

*Corresponding author for this work

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Quantifying the energetic costs of human induced behavioral disturbance on wildlife is a crucial step to evaluate the potential long-term effects of disturbance on individual vital rates. Standard methods cannot be used for estimating energetic cost of transport because of the large size of most cetaceans, and instead energetic costs are inferred from respiration rates. We quantified the added energetic costs of avoidance to whale watching boats for minke whales (Balaenoptera acutorostrata) in Faxafloi bay, Iceland, by comparing minke whale movement tracks and respiration in the presence (impact) and absence (control) of whale watching boats. Energy expenditure was inferred from respiration rates, using published bioenergetic models for minke whales and mass-specific cost of transport (COT) was estimated for different swimming speeds. The sensitivity of the COT estimate to model assumptions was investigated using resampling methods. ANCOVA was used to investigate the effects of swimming speed and whale watching boats on minke whale respiration rate. Respiration rate increased linearly with swimming speed, while COT decreased nonlinearly with increased speed up to an optimal speed between 2.5 and 7.0 m s(-1). Respiration rates were higher during interactions with whale watching boats at any given speed, suggesting that boat presence elicited a stress response in the animals, resulting in a 23.2% increase in estimated energy expenditure. Swimming speed also increased during whale watching interactions from 1.62 to 2.64 m s(-1), resulting in an additional 4.4% increase in estimated energy expenditure during whale watching interactions. Thus, whale watching boat interactions resulted in an overall increase in estimated energy expenditure of 27.6%, from 56.54 to 72.16 J kg(-1) min(-1). During interactions with whale watching boats, minke whales swam at speeds that were within the lower range of the optimal COT. This suggests that minke whales employ similar avoidance strategies towards whale watching boats as towards natural predators. (C) 2014 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)96-104
Number of pages9
JournalJournal of Experimental Marine Biology and Ecology
Volume459
Early online date5 Jun 2014
DOIs
Publication statusPublished - Oct 2014

Keywords

  • cost of transport
  • metabolic rate
  • swimming speed
  • sensitivity analysis
  • stress
  • tourism impact
  • dolphins tursiops-truncatus
  • steller sea lions
  • heart-rate
  • metabolic-rate
  • killer whales
  • eumetopias-jubatus
  • human disturbance
  • harbor porpoise
  • orcinus-orca
  • fin whales

Cite this

Inferring energy expenditure from respiration rates in minke whales to measure the effects of whale watching boat interactions. / Christiansen, Fredrik; Rasmussen, Marianne H.; Lusseau, David.

In: Journal of Experimental Marine Biology and Ecology, Vol. 459, 10.2014, p. 96-104.

Research output: Contribution to journalArticle

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abstract = "Quantifying the energetic costs of human induced behavioral disturbance on wildlife is a crucial step to evaluate the potential long-term effects of disturbance on individual vital rates. Standard methods cannot be used for estimating energetic cost of transport because of the large size of most cetaceans, and instead energetic costs are inferred from respiration rates. We quantified the added energetic costs of avoidance to whale watching boats for minke whales (Balaenoptera acutorostrata) in Faxafloi bay, Iceland, by comparing minke whale movement tracks and respiration in the presence (impact) and absence (control) of whale watching boats. Energy expenditure was inferred from respiration rates, using published bioenergetic models for minke whales and mass-specific cost of transport (COT) was estimated for different swimming speeds. The sensitivity of the COT estimate to model assumptions was investigated using resampling methods. ANCOVA was used to investigate the effects of swimming speed and whale watching boats on minke whale respiration rate. Respiration rate increased linearly with swimming speed, while COT decreased nonlinearly with increased speed up to an optimal speed between 2.5 and 7.0 m s(-1). Respiration rates were higher during interactions with whale watching boats at any given speed, suggesting that boat presence elicited a stress response in the animals, resulting in a 23.2{\%} increase in estimated energy expenditure. Swimming speed also increased during whale watching interactions from 1.62 to 2.64 m s(-1), resulting in an additional 4.4{\%} increase in estimated energy expenditure during whale watching interactions. Thus, whale watching boat interactions resulted in an overall increase in estimated energy expenditure of 27.6{\%}, from 56.54 to 72.16 J kg(-1) min(-1). During interactions with whale watching boats, minke whales swam at speeds that were within the lower range of the optimal COT. This suggests that minke whales employ similar avoidance strategies towards whale watching boats as towards natural predators. (C) 2014 Elsevier B.V. All rights reserved.",
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author = "Fredrik Christiansen and Rasmussen, {Marianne H.} and David Lusseau",
note = "We thank the University of Aberdeen, Graduate School Competitive Studentship grant scheme, and IFAW for the financial support. We thank Elding Whale Watching, the municipality of Gar{\dh}ur and the Icelandic Maritime Administration for the logistical support. We thank M{\'y}vatn Research Station for providing research equipment and all the volunteers involved in the data collection. This manuscript was improved with comments from Dr S E Shumway, Dr G C Hays and one anonymous reviewer.",
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N1 - We thank the University of Aberdeen, Graduate School Competitive Studentship grant scheme, and IFAW for the financial support. We thank Elding Whale Watching, the municipality of Garður and the Icelandic Maritime Administration for the logistical support. We thank Mývatn Research Station for providing research equipment and all the volunteers involved in the data collection. This manuscript was improved with comments from Dr S E Shumway, Dr G C Hays and one anonymous reviewer.

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AB - Quantifying the energetic costs of human induced behavioral disturbance on wildlife is a crucial step to evaluate the potential long-term effects of disturbance on individual vital rates. Standard methods cannot be used for estimating energetic cost of transport because of the large size of most cetaceans, and instead energetic costs are inferred from respiration rates. We quantified the added energetic costs of avoidance to whale watching boats for minke whales (Balaenoptera acutorostrata) in Faxafloi bay, Iceland, by comparing minke whale movement tracks and respiration in the presence (impact) and absence (control) of whale watching boats. Energy expenditure was inferred from respiration rates, using published bioenergetic models for minke whales and mass-specific cost of transport (COT) was estimated for different swimming speeds. The sensitivity of the COT estimate to model assumptions was investigated using resampling methods. ANCOVA was used to investigate the effects of swimming speed and whale watching boats on minke whale respiration rate. Respiration rate increased linearly with swimming speed, while COT decreased nonlinearly with increased speed up to an optimal speed between 2.5 and 7.0 m s(-1). Respiration rates were higher during interactions with whale watching boats at any given speed, suggesting that boat presence elicited a stress response in the animals, resulting in a 23.2% increase in estimated energy expenditure. Swimming speed also increased during whale watching interactions from 1.62 to 2.64 m s(-1), resulting in an additional 4.4% increase in estimated energy expenditure during whale watching interactions. Thus, whale watching boat interactions resulted in an overall increase in estimated energy expenditure of 27.6%, from 56.54 to 72.16 J kg(-1) min(-1). During interactions with whale watching boats, minke whales swam at speeds that were within the lower range of the optimal COT. This suggests that minke whales employ similar avoidance strategies towards whale watching boats as towards natural predators. (C) 2014 Elsevier B.V. All rights reserved.

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KW - swimming speed

KW - sensitivity analysis

KW - stress

KW - tourism impact

KW - dolphins tursiops-truncatus

KW - steller sea lions

KW - heart-rate

KW - metabolic-rate

KW - killer whales

KW - eumetopias-jubatus

KW - human disturbance

KW - harbor porpoise

KW - orcinus-orca

KW - fin whales

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