Common bottlenose dolphins (Tursiops truncatus) in Lake Pontchartrain, Louisiana, 2007 to mid-2014.

Mullin, Keith D.; Barry, Kevin P.; Sinclair, Carrie; Litz, Jenny A.; Maze-Foley, Katherine; Fougeres, Erin; Ewing, Ruth Y.; Gorgone, Antoinette M.; Adams, Jeff; Tumlin, Mandy C.

doi:10.7289/v51c1tt8

2015

DOI: 10.7289/v51c1tt8

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Common bottlenose dolphins (Tursiops truncatus) in Lake Pontchartrain, Louisiana, 2007 to mid-2014.

Keith D. Mullin¹,

Kevin P. Barry²,

Carrie Sinclair³

et al.

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Fresh water skin disease in dolphins: a case definition based on pathology and environmental factors in Australia

Duignan

Stephens

Robb³

2020

Sci Rep

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A distinct ulcerative dermatitis known as “freshwater skin disease” is an emerging clinical and pathological presentation in coastal cetaceans worldwide. In Australia, two remarkably similar mortality events enabled the creation of a case definition based on pathology and environmental factors. The first affected a community of endemic Tursiops australis in the Gippsland Lakes, Victoria, while the second occurred among T. aduncus resident in the Swan-Canning River system, Western Australia. The common features of both events were (1) an abrupt and marked decrease in salinity (from > 30ppt to < 5ppt) due to rainfall in the catchments, with hypo-salinity persisting weeks to months, and (2) dermatitis characterized grossly by patchy skin pallor that progressed to variable circular or targetoid, often raised, and centrally ulcerated lesions covering up to 70% of the body surface. The affected skin was often colonized by a variety of fungal, bacterial and algal species that imparted variable yellow, green or orange discoloration. Histologic lesions consisted of epidermal hydropic change leading to vesiculation and erosion; alternately, or in addition, the formation of intra-epithelial pustules resulting in ulceration and hypodermal necrosis. Thus, the environmental factors and characteristic pathologic lesions, are necessary components of the case definition for freshwater skin disease.

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Fresh water skin disease in dolphins: a case definition based on pathology and environmental factors in Australia

Duignan

Stephens

Robb³

2020

Sci Rep

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Common Bottlenose Dolphin, Tursiops truncatus, Behavioral Response to a Record-Breaking Flood Event in Pensacola Bay, Florida

McBride-Kebert¹,

Toms

2021

JZBG

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Common bottlenose dolphins, Tursiops truncatus, can suffer health complications from prolonged freshwater exposure; however, little is known about how dolphins behaviorally respond to flood events. We investigated whether dolphins mitigated their freshwater exposure by moving south towards the estuary mouth and/or towards deeper areas with higher salinities in response to a record-breaking flood in Pensacola Bay, Florida. In total, 144 dolphin groups observed during 45 population dynamic surveys were analyzed across two flood-impacted sampling sessions and their respective seasonal control sessions. Kernel density estimates demonstrated southern movement towards the estuary mouth during flood-impacted sessions, but this distribution change was limited. Species distribution models showed that dolphins did not move to deeper areas after the flood and dolphin distribution was not substantially altered by flood-induced salinity changes. The estuary system exhibits strongly stratified waters with broad salinity ranges even during the flood. Dolphins may have mitigated the severity of freshwater exposure by capitalizing on these stratified areas as they continued to use habitat affected by the flood. A lack of avoidance of low salinity could result in this dolphin population being at greater risk for health problems, which should be considered in future population management and conservation.

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Common bottlenose dolphins (Tursiops truncatus) in Lake Pontchartrain, Louisiana, 2007 to mid-2014.

Cited by 2 publications

References 0 publications

Fresh water skin disease in dolphins: a case definition based on pathology and environmental factors in Australia

Fresh water skin disease in dolphins: a case definition based on pathology and environmental factors in Australia

Common Bottlenose Dolphin, Tursiops truncatus, Behavioral Response to a Record-Breaking Flood Event in Pensacola Bay, Florida

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