Elevated body temperatures of adult female leopard sharks, Triakis semifasciata, while aggregating in shallow nearshore embayments: Evidence for behavioral thermoregulation?

Hight, Barbara V.; Lowe, Christopher G.

doi:10.1016/j.jembe.2007.07.021

Cited by 166 publications

(154 citation statements)

References 28 publications

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“…Significant Pvalues are in bold (α=0.05) The elasmobranch assemblages caught by the shrimp trawl fishery were slightly influenced by diel period. Most elasmobranch species display higher activity levels during the night-a characteristic mainly related to foraging or social refuging behaviors (Wearmouth and Sims, 2008;Jacoby et al, 2012;Espinoza et al, 2011). Catch of elasmobranchs in trawl hauls, therefore, is expected to be higher during the day than at night; however, very few studies have addressed diel periodicity of bycatch (Molina and Cooke, 2012).…”

Section: Discussion Elasmobranch Diversity and Distribution Patternsmentioning

confidence: 99%

“…In contrast, some species like the brown smoothhound had a male-biased sex ratio; male brown smoothhound occurred in deep habitats (depths >100 m) and gravid females were more abundant in warmer (>20°C), shallow, coastal habitats. Gravid females are thought to use warmer habitats that may offer thermal reproductive advantages, such as increased growth rates of embryos (Hight and Lowe, 2007;Pereyra et al, 2008;Speed et al, 2012).…”

Section: Discussion Elasmobranch Diversity and Distribution Patternsmentioning

confidence: 99%

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Elasmobranch bycatch associated with the shrimp trawl fishery off the Pacific coast of Costa Rica, Central America

Clarke¹,

Espinoza²,

Ahrens³

et al. 2015

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Abstract-Demersal sharks and raysare common yet vulnerable components of the bycatch in tropical bottom-trawl fisheries. Little is known about the elasmobranch assemblages associated with most of these fisheries, particularly within the eastern tropical Pacific. This study characterized the elasmobranch assemblage associated with the shrimp trawl fishery along the Pacific coast of Costa Rica. Between August 2008 and August 2012, 346 trawl hauls were conducted at depths of 18-350 m. These hauls resulted in a sample of 4564 elasmobranchs from 25 species and 13 families. The Panamic stingray (Urotrygon aspidura), rasptail skate (Raja velezi), brown smoothhound (Mustelus henlei), and witch guitarfish (Zapteryx xyster) accounted for more than 66% of the elasmobranch abundance within the bycatch. Depth was the main factor influencing the elasmobranch assemblage; species richness was significantly higher at depths <100 m than at other depths. Two groups of elasmobranchs were identified: the first was found in shallow waters (<50 m), and the second was observed at depths of 50-350 m. Sex and size segregation patterns are also influenced by depth. Moreover, we documented the shift of the bottomtrawl fishery toward shallow-water resources-a change that could be problematic considering that elasmobranch diversity is higher in shallow waters.

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Section: Discussion Elasmobranch Diversity and Distribution Patternsmentioning

confidence: 99%

Section: Discussion Elasmobranch Diversity and Distribution Patternsmentioning

confidence: 99%

Elasmobranch bycatch associated with the shrimp trawl fishery off the Pacific coast of Costa Rica, Central America

Clarke¹,

Espinoza²,

Ahrens³

et al. 2015

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“…It is possible to retrieve stored data from some types of DSTs by two-way communication with receivers without recapturing the fish (so-called CHAT-tags, Hight and Lowe, 2007). Stored data are downloaded from the tag to the receiver when the fish is swimming within range of the receiver (receiver range of 500 m in the study of Hight and Lowe, 2007).…”

Section: Data Storage Tags (Dst)mentioning

confidence: 99%

Section: Data Storage Tags (Dst)mentioning

confidence: 99%

“…Stored data are downloaded from the tag to the receiver when the fish is swimming within range of the receiver (receiver range of 500 m in the study of Hight and Lowe, 2007). The tags used by Hight and Lowe (2007) are at present not provided by the manufacturer. At the moment there seem to be only a few tag models that are provided by manufacturers of telemetry equipment using a technology where sensor data (depth and temperature, or accelerometer data Almeida et al, accepted) are stored and processed in the tag and can be downloaded when the fish passes a receiver.…”

Section: Data Storage Tags (Dst)mentioning

confidence: 99%

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Thorstad¹,

Rikardsen²,

Alp³

et al. 2014

Turk. J. Fish. Aquat. Sci.

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An overview of electronic tags that can be used in fish research is given, including radio and acoustic transmitters, data storage tags (DST, also termed archival tags), pop-up satellite archival tags (PSAT) and passive integrated transponder tags (PIT-tag). Fish telemetry is a term used to describe the application of these methods. Typically, an electronic tag is attached to a free-swimming fish, and information on position, movements and/or measurements of environmental and physiological parameters can be recorded wirelessly by use of a mobile receiver or stationary loggers. For most methods, the fish need not to be recaptured to achieve data. However, DSTs record and store information on environmental and/or physiological parameters in the tag, and therefore need to be retrieved for downloading data. In the case of PSATs, stored data is transferred to satellites when the tag loosens from the fish and pops up to the surface, and in addition, the pop up position is recorded. The developments of telemetry methods have provided opportunities to reveal previously unknown information on fish behavior, habitat use and migrations in fresh water, estuaries, near-coastal areas and oceans, especially since extensive longterm data can be collected repeatedly from individual fish. Detailed information on fish behaviour and migrations is needed to better understand, protect and manage fishes in freshwater and marine systems. The development of successful management measures depends on knowledge of where fish reside and migrate during the day, season and year. There has been a tremendous increase in the use of electronic tagging methods, especially during the last 10-20 years. In addition to descriptive and ecological studies, the methods have been used to assess effects of for instance hydropower production, other river regulations, migration barriers, protected areas, fishing regulations, catch-and-release angling, hatchery-rearing, fish aggregating devices (FADs), water pollution and aquaculture. The main methods for attaching electronic tags to fish are 1) surgical implantation in the body cavity, 2) external attachment, and 3) gastric insertion via the mouth. Potential negative handling effects are inflammations, infections, tag expulsion, altered behavior, decreased swimming performance, reduced feeding, reduced growth and increased mortality. The catch, handling and tagging procedures should have minimal effects on the fish. If not, an anomalous behaviour caused by the tagging may be recorded instead of the natural behaviour, and the study is a failure from a scientific point of view. Furthermore, optimal anaesthetic and tagging methods are required to meet the ethical standards for use of experimental animals, and to ensure fish survival and welfare.

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The conservation implications of spatial and temporal variability in the diurnal use of Bahamian tidal mangrove creeks by transient predatory fishes

Harborne

Talwar

Brooks

2015

Aquatic Conservation

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1. Mangrove creeks have a range of functional roles in tropical seascapes, but their use as feeding and refuge areas for commercially and ecologically important transient predators is poorly understood.2. This study used video cameras to investigate the diurnal use of three Bahamian mangrove creeks by transient predators during a 2-month period. More than 500 fishes from 10 species were recorded, including elasmobranchs, reef-associated fishes, and nearshore specialists. A multivariate analysis indicated that movement of the transient predator assemblage was not significantly linked to any abiotic variable and did not vary among creeks.3. Generalized linear mixed-effects models of the four most abundant transient predators demonstrated species-specific variations in creek use. Sightings of Caranx ruber and Negaprion brevirostris varied significantly among the three creeks. Furthermore, C. ruber was seen most frequently close to high tide, while N. brevirostris was seen more frequently with increasing time since sunrise and during higher tidal ranges. Sphyraena barracuda and Tylosurus crocodilus were seen most frequently just after low tide. All three creeks appear to be functionally important for transient predators, but these species exhibit considerable spatio-temporal variability in how they use this habitat.4. Mangrove creeks are threatened by a range of anthropogenic stressors, and are frequently a target of conservation initiatives. The species-specific spatial variability in creek use demonstrates that simply including representative creeks in marine protected areas could exclude functionally important areas. Furthermore, development that alters tidal cycles in creeks is likely to have significant impacts on transient predators, and underscores the need for restoration and conservation of hydrological flow.

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Elevated body temperatures of adult female leopard sharks, Triakis semifasciata, while aggregating in shallow nearshore embayments: Evidence for behavioral thermoregulation?

Cited by 166 publications

References 28 publications

Elasmobranch bycatch associated with the shrimp trawl fishery off the Pacific coast of Costa Rica, Central America

Elasmobranch bycatch associated with the shrimp trawl fishery off the Pacific coast of Costa Rica, Central America

Untitled

The conservation implications of spatial and temporal variability in the diurnal use of Bahamian tidal mangrove creeks by transient predatory fishes

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