Post-Release Monitoring of a Stranded and Rehabilitated Short-Finned Pilot Whale (Globicephala macrorhynchus) Reveals Current-Assisted Travel

Moore, Reny B. Tyson; Douglas, David C.; Nollens, Hendrik H.; Croft, Lara; Wells, Randall S.

doi:10.1578/am.46.2.2020.200

Cited by 8 publications

(4 citation statements)

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“…In one study in the short-finned pilot whale, deep dives (depth >200 m) during the day were longer and deeper but most deep dives occurred at night (Owen et al, 2019). However, this was not observed in another study involving a rehabilitated pilot whale where deeper and longer dives at night were reported (Tyson Moore et al, 2020). Similarly, Cuvier's beaked whales show diurnal changes in dive behavior, although the specific changes appear to vary slightly between locations (Baird et al, 2008;Barlow et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…More recently, Wells et al (2013) reported continuous movement throughout the day and night for Sarasota Bay dolphins, although with decreased travel rate at night. Diurnal variation in diving behavior has also been reported in both toothed and baleen whales; e.g., rough toothed dolphins ( Steno bredanensis ), pantropical spotted dolphins ( Stenella attenuata ), spinner dolphins ( Stenella longirostris ), pygmy killer whales ( Feresa attenuata ), Risso's dolphins ( Grampus griseus ), short‐finned pilot whales, southern resident killer whales ( Orcinus orca ), melon‐headed whales ( Peponocephala electra ), and also humpback whales ( Megaptera novaeangliae ) (Aoki et al, 2017; Baird et al, 2001, 2005; Friedlaender et al, 2013; Norris et al, 1994; Owen et al, 2019; Pulis et al, 2018; Rone et al, 2022; Shaff & Baird, 2021; Tyson Moore et al, 2020; Visser et al, 2021; West et al, 2018). In most of these species, most dives occur at night, but deep dives during the day were to greater depths as compared to at night.…”

Section: Discussionmentioning

confidence: 99%

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Deep diving by offshore bottlenose dolphins (Tursiops spp.)

Fahlman

Moore

Stone

et al. 2023

Marine Mammal Science

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We used satellite‐linked tags to evaluate dive behavior in offshore bottlenose dolphins (Tursiops spp.) near the island of Bermuda. The data provide evidence that bottlenose dolphins commonly perform both long (>272 s) and deep (>199 m) dives, with the deepest and longest dives being to 1,000 m and 826 s (13.8 min), respectively. The data show a relationship between dive duration and dive depth for dives longer than about 272 s. There was a diurnal pattern to dive behavior, with most dives deeper than 50 m being performed at night; deep diving began at sunset and varied throughout the night. We used the cumulative frequency of dive duration to estimate a behavioral aerobic dive limit (bADL) of around 560–666 s (9.3–11.1 min) in adult dolphins in this population. Dives exceeding the bADL spent significantly longer time in the upper‐most 50 m following a dive as compared with dives less than the bADL. We conclude that the offshore ecotype off Bermuda, unlike the shallow‐diving near‐shore bottlenose dolphin, is a deep‐diving ecotype, and may provide a useful animal model to study extreme diving behavior and adaptations.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Deep diving by offshore bottlenose dolphins (Tursiops spp.)

Fahlman

Moore

Stone

et al. 2023

Marine Mammal Science

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“…This may be particularly important in the southern portion of the study area where the undercurrent is the strongest and age-2 hake tend to be most prevalent. Although the degree to which ocean currents may assist pelagic fish migration is poorly understood, other marine species such as turtles, whales, and bumphead sunfish (Mola alexandrini) have been shown to have ocean current-assisted migration (Gaspar et al 2006;Shillinger et al 2008;Tyson Moore et al 2020;Chang et al 2021). Supporting this migration assistance hypothesis is our finding that the center of gravity for age-2 hake had the strongest correlation with mean annual northward velocity (Table 3), suggesting the youngest and smallest hake tend to be distributed further north in years with a stronger northward flowing undercurrent.…”

Section: Discussionmentioning

confidence: 99%

Spatially varying effects of the California Undercurrent on Pacific hake distribution

Malick,

Hunsicker,

Haltuch

et al. 2024

Can. J. Fish. Aquat. Sci.

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In the California Current Ecosystem, the California Undercurrent (CU) is the predominate subsurface current that transports nutrient rich water from southern California poleward. In this study, we used a large data set of spatially explicit in situ observations of Pacific hake and the CU (36.5–48.3°N) to estimate relationships between northward undercurrent velocity and hake distribution and determine if these relationships vary across space or life-history stage. We found that both hake occurrence and density had strong spatially complex relationships with the CU. In areas north of 44°N (central Oregon), the CU effect was spatially consistent and opposite for occurrence (negative) and density (positive), indicating that hake may aggregate in areas of high northward velocity in this region. In areas south of 44°N, the CU effect showed a cross-shelf gradient for both occurrence and density, indicating a more nearshore hake distribution when northward velocity is higher in this region. Together, our results suggest that future changes in the CU due to climate change are likely to impact hake differently in northern and southern areas.

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“…Three SPOT100 tags (Figure 2e) were deployed in Baía Babitonga in 2011, and one SPOT299‐B tag (Figure 2g) was deployed in Baía Babitonga in 2013. The latter tag design had been tested extensively on bottlenose dolphins in Florida and demonstrated to have minimal impact on the animals (Wells, 2013), and has been deployed on bottlenose dolphins and other small cetaceans elsewhere (Mullin et al, 2017; Pulis et al, 2018; Tyson Moore et al, 2020; Wells et al, 2017). SPLASH10 tags (21.2 cm L × 2.1 cm W × 3.1 cm H, 90 g) are slightly larger than SPOT tags (20.8 cm L × 2.0 cm W × 2.4 cm H, 65 g).…”

Section: Methodsmentioning

confidence: 99%

Tagging, ranging patterns, and behavior of franciscana dolphins (Pontoporia blainvillei) off Argentina and Brazil: Considerations for conservation

Wells

Cremer

Berninsone

et al. 2021

Marine Mammal Science

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The franciscana dolphin, Pontoporia blainvillei, is one of the most threatened cetaceans in the Southwestern Atlantic. Within their limited coastal range off Argentina, Uruguay, and Brazil, franciscanas face human activities, including artisanal gillnet fishing and coastal development. A lack of information on ranging patterns, population structure, and behavior for informing management led to efforts to develop and apply approaches to tag franciscanas in Argentina (Bahía Samborombón [BS], Bahía San Blas [BSB]) and Brazil (Baía Babitonga [BB]) during 2005–2013. Findings from VHF tags deployed in BS in 2005 during feasibility tests for catching and handling franciscanas for tagging suggested residency over periods of weeks. Subsequently, satellite‐linked tags confirmed patterns of residency at each site. Home range size varied, with ranges of 5–7 km2 for BB, 51–312 km2 for BS, and 49–1,014 km2 for BSB. Diving patterns varied across sites, with the animals using the entire water column, exposing them to fishing nets regardless of the depth at which the nets were set. Tracking durations and follow‐up observations indicated that this research approach is useful for studies of franciscanas. Small, definable ranges facilitate relating specific geographically based threats to appropriate population units, increasing the potential for effective conservation.

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Post-Release Monitoring of a Stranded and Rehabilitated Short-Finned Pilot Whale (Globicephala macrorhynchus) Reveals Current-Assisted Travel

Cited by 8 publications

References 0 publications

Deep diving by offshore bottlenose dolphins (Tursiops spp.)

Deep diving by offshore bottlenose dolphins (Tursiops spp.)

Spatially varying effects of the California Undercurrent on Pacific hake distribution

Tagging, ranging patterns, and behavior of franciscana dolphins (Pontoporia blainvillei) off Argentina and Brazil: Considerations for conservation

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