Food provisioning increases the risk of injury in a long-lived marine top predator

Fredrik Christiansen, Katherine A McHugh, Lars Bejder, Eilidh M Siegal, David Lusseau, Elizabeth Berens McCabe, Gretchen Lovewell, Randall S Wells

Research output: Contribution to journalArticle

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Abstract

Food provisioning of wildlife is a major concern for management and conservation agencies worldwide because it encourages unnatural behaviours in wild animals and increases each individual's risk for injury and death. Here we investigate the contributing factors and potential fitness consequences of a recent increase in the frequency of human interactions with common bottlenose dolphins (Tursiops truncatus) in Sarasota Bay, Florida. A rising proportion of the local long-term resident dolphin community is becoming conditioned to human interactions through direct and indirect food provisioning. We investigate variables that are affecting conditioning and if the presence of human-induced injuries is higher for conditioned versus unconditioned dolphins. Using the most comprehensive long-term dataset available for a free-ranging bottlenose dolphin population (more than 45 years; more than 32 000 dolphin group sightings; more than 1100 individuals), we found that the association with already conditioned animals strongly affected the probability of dolphins becoming conditioned to human interactions, confirming earlier findings that conditioning is partly a learned behaviour. More importantly, we found that conditioned dolphins were more likely to be injured by human interactions when compared with unconditioned animals. This is alarming, as conditioning could lead to a decrease in survival, which could have population-level consequences. We did not find a significant relationship between human exposure or natural prey availability and the probability of dolphins becoming conditioned. This could be due to low sample size or insufficient spatio-temporal resolution in the available data. Our findings show that wildlife provisioning may lead to a decrease in survival, which could ultimately affect population dynamics.

Original languageEnglish
Article number160560
JournalRoyal Society Open Science
Volume3
Issue number12
DOIs
Publication statusPublished - 21 Dec 2016

Fingerprint

Dolphins
Bottle-Nosed Dolphin
Food
Wounds and Injuries
Common Dolphins
Wild Animals
Survival
Population Dynamics
Sample Size
Population
Conditioning (Psychology)

Keywords

  • anthropogenic disturbance
  • behavior
  • dolphin
  • human exposure
  • Sarasota
  • wildlife management

Cite this

Christiansen, F., McHugh, K. A., Bejder, L., Siegal, E. M., Lusseau, D., McCabe, E. B., ... Wells, R. S. (2016). Food provisioning increases the risk of injury in a long-lived marine top predator. Royal Society Open Science, 3(12), [160560]. https://doi.org/10.1098/rsos.160560

Food provisioning increases the risk of injury in a long-lived marine top predator. / Christiansen, Fredrik ; McHugh, Katherine A; Bejder, Lars; Siegal, Eilidh M; Lusseau, David; McCabe, Elizabeth Berens; Lovewell, Gretchen; Wells, Randall S.

In: Royal Society Open Science, Vol. 3, No. 12, 160560, 21.12.2016.

Research output: Contribution to journalArticle

Christiansen, F, McHugh, KA, Bejder, L, Siegal, EM, Lusseau, D, McCabe, EB, Lovewell, G & Wells, RS 2016, 'Food provisioning increases the risk of injury in a long-lived marine top predator' Royal Society Open Science, vol. 3, no. 12, 160560. https://doi.org/10.1098/rsos.160560
Christiansen, Fredrik ; McHugh, Katherine A ; Bejder, Lars ; Siegal, Eilidh M ; Lusseau, David ; McCabe, Elizabeth Berens ; Lovewell, Gretchen ; Wells, Randall S. / Food provisioning increases the risk of injury in a long-lived marine top predator. In: Royal Society Open Science. 2016 ; Vol. 3, No. 12.
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abstract = "Food provisioning of wildlife is a major concern for management and conservation agencies worldwide because it encourages unnatural behaviours in wild animals and increases each individual's risk for injury and death. Here we investigate the contributing factors and potential fitness consequences of a recent increase in the frequency of human interactions with common bottlenose dolphins (Tursiops truncatus) in Sarasota Bay, Florida. A rising proportion of the local long-term resident dolphin community is becoming conditioned to human interactions through direct and indirect food provisioning. We investigate variables that are affecting conditioning and if the presence of human-induced injuries is higher for conditioned versus unconditioned dolphins. Using the most comprehensive long-term dataset available for a free-ranging bottlenose dolphin population (more than 45 years; more than 32 000 dolphin group sightings; more than 1100 individuals), we found that the association with already conditioned animals strongly affected the probability of dolphins becoming conditioned to human interactions, confirming earlier findings that conditioning is partly a learned behaviour. More importantly, we found that conditioned dolphins were more likely to be injured by human interactions when compared with unconditioned animals. This is alarming, as conditioning could lead to a decrease in survival, which could have population-level consequences. We did not find a significant relationship between human exposure or natural prey availability and the probability of dolphins becoming conditioned. This could be due to low sample size or insufficient spatio-temporal resolution in the available data. Our findings show that wildlife provisioning may lead to a decrease in survival, which could ultimately affect population dynamics.",
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N2 - Food provisioning of wildlife is a major concern for management and conservation agencies worldwide because it encourages unnatural behaviours in wild animals and increases each individual's risk for injury and death. Here we investigate the contributing factors and potential fitness consequences of a recent increase in the frequency of human interactions with common bottlenose dolphins (Tursiops truncatus) in Sarasota Bay, Florida. A rising proportion of the local long-term resident dolphin community is becoming conditioned to human interactions through direct and indirect food provisioning. We investigate variables that are affecting conditioning and if the presence of human-induced injuries is higher for conditioned versus unconditioned dolphins. Using the most comprehensive long-term dataset available for a free-ranging bottlenose dolphin population (more than 45 years; more than 32 000 dolphin group sightings; more than 1100 individuals), we found that the association with already conditioned animals strongly affected the probability of dolphins becoming conditioned to human interactions, confirming earlier findings that conditioning is partly a learned behaviour. More importantly, we found that conditioned dolphins were more likely to be injured by human interactions when compared with unconditioned animals. This is alarming, as conditioning could lead to a decrease in survival, which could have population-level consequences. We did not find a significant relationship between human exposure or natural prey availability and the probability of dolphins becoming conditioned. This could be due to low sample size or insufficient spatio-temporal resolution in the available data. Our findings show that wildlife provisioning may lead to a decrease in survival, which could ultimately affect population dynamics.

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