Diet of Common Bottlenose Dolphins, Tursiops truncatus, that Stranded in and Near Barataria Bay, Louisiana, 2010–2012

Bowen-Stevens, Sabrina R.; Gannon, Damon P.; Hazelkorn, Rebeccah A.; Lovewell, Gretchen N.; Volker, Kristen M.; Smith, Suzanne M.; Tumlin, Mandy C.; Litz, Jenny A.

doi:10.1656/058.020.0113

Cited by 3 publications

(1 citation statement)

References 58 publications

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“…In our model, dolphins exerted the strongest top-down control on small sciaenids, and the decrease in survival and reproduction of dolphins may have played a role in the stability of small sciaenids. These fish were the most common prey item in dolphin stomachs recovered following the oil spill, making up over one-third of all items (Bowen-Stevens et al 2021). In our model, small sciaenids made up over two-thirds of dolphin diet by mass.…”

Section: Discussionmentioning

confidence: 99%

Fishery closures, more than predator release, increased persistence of nearshore fishes and invertebrates to the Deepwater Horizon oil spill

Oken¹,

Able²,

Mutsert³

et al. 2022

Preprint

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The Deepwater Horizon disaster released 4.9 million barrels of oil into the Gulf of Mexico. Despite clear evidence of exposure and toxicity, there has been little evidence of population-level declines of most nearshore fish and invertebrate populations. Several hypotheses have been proposed to explain this paradox. Two possibilities include a fishing moratorium following the spill and reductions in predation pressure following predator die-offs. We tested both using mass-balance food web models to quantify direct and indirect population sensitivity to perturbations in fishing pressure and bird and dolphin mortality. In doing so, we developed a new method allowing us to quantify responses of one functional group to changes in fishing pressure across all fished groups. We inferred support for a compensatory mechanism, either release from fishing or predation, when the magnitude of modeled population increases following perturbations in fishing or predation far exceeded observations. We found the fishing moratorium to be the most likely potential mitigating mechanism, especially for penaeid shrimp, menhaden, and blue crabs. Dolphin mortality may explain the stability of small sciaenids. Increased seabird mortality did not lead to major changes in any functional group we examined. The consideration of indirect trophic pathways within the food web model produced a wide range of plausible population responses, especially responses to increases in predator mortality. Broadly, this work shows that oil spills are one driver of population dynamics within a broader socioecological system, and understanding oil spill impacts on populations requires consideration of this complexity.

show abstract

Section: Discussionmentioning

confidence: 99%

Fishery closures, more than predator release, increased persistence of nearshore fishes and invertebrates to the Deepwater Horizon oil spill

Oken¹,

Able²,

Mutsert³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

Fishery Closures, More Than Predator Release, Increased Persistence of Nearshore Fishes and Invertebrates to the Deepwater Horizon Oil Spill

Oken

Able

Mutsert

et al. 2023

Estuaries and Coasts

View full text Add to dashboard Cite

The Deepwater Horizon disaster released 4.9 million barrels of oil into the Gulf of Mexico.Despite clear evidence of exposure and toxicity, there has been little evidence of population-level declines of most nearshore fish and invertebrate populations. Several hypotheses have been proposed to explain this paradox. Two possibilities include a fishing moratorium following the spill and reductions in predation pressure following predator die-offs. We tested both using mass-balance food web models to quantify direct and indirect population sensitivity to perturbations in fishing pressure and bird and dolphin mortality. In doing so, we developed a new method allowing us to quantify responses of one functional group to changes in fishing pressure across all fished groups. We inferred support for a compensatory mechanism, either release from fishing or predation, when populations modeled without any oil-induced mortality displayed large increases to negative perturbations in fishing or predation. We found the fishing moratorium to be the most likely potential mitigating mechanism, especially for penaeid shrimp, menhaden, and blue crabs. Dolphin mortality may explain the stability of small sciaenids.Increased seabird mortality did not lead to major changes in any functional group we examined.The consideration of indirect trophic pathways within the food web model produced a wide range of plausible population responses, especially responses to increases in predator mortality.Broadly, this work shows that oil spills are one driver of population dynamics within a broader socioecological system, and understanding oil spill impacts on populations requires consideration of this complexity.

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Effect of trophic position on mercury concentrations in bottlenose dolphins (Tursiops truncatus) from the northern Gulf of Mexico

McCormack

Nowlin

Dutton

2022

Environmental Research

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Diet of Common Bottlenose Dolphins, Tursiops truncatus, that Stranded in and Near Barataria Bay, Louisiana, 2010–2012

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 3 publications

References 58 publications

Fishery closures, more than predator release, increased persistence of nearshore fishes and invertebrates to the Deepwater Horizon oil spill

Fishery closures, more than predator release, increased persistence of nearshore fishes and invertebrates to the Deepwater Horizon oil spill

Fishery Closures, More Than Predator Release, Increased Persistence of Nearshore Fishes and Invertebrates to the Deepwater Horizon Oil Spill

Effect of trophic position on mercury concentrations in bottlenose dolphins (Tursiops truncatus) from the northern Gulf of Mexico

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