Signature whistles of free-ranging bottlenose dolphins Tursiops truncatus: stability and mother-offspring comparisons

1990 ◽  
Vol 26 (4) ◽  
Author(s):  
LaelaS. Sayigh ◽  
PeterL. Tyack ◽  
RandallS. Wells ◽  
MichaelD. Scott
Keyword(s):  
Tursiops Truncatus ◽  
Bottlenose Dolphins ◽  
Signature Whistles ◽  
Free Ranging

scholarly journals PAPILLOMAVIRUS ANTIBODY PREVALENCE IN FREE-RANGING AND CAPTIVE BOTTLENOSE DOLPHINS (TURSIOPS TRUNCATUS)

2010 ◽  
Vol 46 (1) ◽  
pp. 136-145 ◽  
Author(s):  
Manuela Rehtanz ◽  
Shin-je Ghim ◽  
Wayne McFee ◽  
Bethany Doescher ◽  
Géraldine Lacave ◽  
...  
Keyword(s):  
Tursiops Truncatus ◽  
Bottlenose Dolphins ◽  
Antibody Prevalence ◽  
Free Ranging

scholarly journals Physiological Effects of Low Salinity Exposure on Bottlenose Dolphins (Tursiops truncatus)

2020 ◽  
Vol 1 (1) ◽  
pp. 61-75 ◽  
Author(s):  
Abby M. McClain ◽  
Risa Daniels ◽  
Forrest M. Gomez ◽  
Sam H. Ridgway ◽  
Ryan Takeshita ◽  
...  
Keyword(s):  
Medical Records ◽  
Tursiops Truncatus ◽  
Bottlenose Dolphins ◽  
Blood Samples ◽  
Low Salinity ◽  
Worldwide Distribution ◽  
Salinity Levels ◽  
Seawater Environment ◽  
Future Work ◽  
Free Ranging

Bottlenose dolphins (Tursiops truncatus) have a worldwide distribution in temperate and tropical waters and often inhabit estuarine environments, indicating their ability to maintain homeostasis in low salinity for limited periods of time. Epidermal and biochemical changes associated with low salinity exposure have been documented in stranded bottlenose dolphins; however, these animals are often found severely debilitated or deceased and in poor condition. Dolphins in the U.S. Navy Marine Mammal Program travel globally, navigating varied environments comparable to those in which free-ranging dolphins are observed. A retrospective analysis was performed of medical records from 46 Navy dolphins and blood samples from 43 Navy dolphins exposed to a variety of salinity levels for different durations over 43 years (from 1967–2010). Blood values from samples collected during low salinity environmental exposure (salinity ranging from 0–30 parts per thousand (ppt) were compared to samples collected while those same animals were in a seawater environment (31–35 ppt). Epidermal changes associated with low salinity exposure were also assessed. Significant decreases in serum sodium, chloride, and calculated serum osmolality and significant increases in blood urea nitrogen and aldosterone were observed in blood samples collected during low salinity exposure. Epidermal changes were observed in 35% of the animals that spent time in low salinity waters. The prevalence of epidermal changes was inversely proportional to the level of salinity to which the animals were exposed. Future work is necessary to fully comprehend the impacts of low salinity exposure in bottlenose dolphins, but the physiological changes observed in this study will help improve our understanding of the upper limit of duration and the lower limit of salinity in which a bottlenose dolphin can maintain homeostasis.

Mark–recapture of individually distinctive calls—a case study with signature whistles of bottlenose dolphins (Tursiops truncatus)

2020 ◽  
Vol 101 (5) ◽  
pp. 1289-1301
Author(s):  
Emma G Longden ◽  
Simon H Elwen ◽  
Barry McGovern ◽  
Bridget S James ◽  
Clare B Embling ◽  
...  
Keyword(s):  
Tursiops Truncatus ◽  
Bottlenose Dolphins ◽  
Weather Conditions ◽  
Acoustic Monitoring ◽  
Initial Increase ◽  
Visual Methods ◽  
Mark Recapture ◽  
Animal Populations ◽  
Signature Whistles ◽  
Using Data

Abstract Robust abundance estimates of wild animal populations are needed to inform management policies and are often obtained through mark–recapture (MR) studies. Visual methods are commonly used, which limits data collection to daylight hours and good weather conditions. Passive acoustic monitoring offers an alternative, particularly if acoustic cues are naturally produced and individually distinctive. Here we investigate the potential of using individually distinctive signature whistles in a MR framework and evaluate different components of study design. We analyzed signature whistles of common bottlenose dolphins, Tursiops truncatus, using data collected from static acoustic monitoring devices deployed in Walvis Bay, Namibia. Signature whistle types (SWTs) were identified using a bout analysis approach (SIGnature IDentification [SIGID]—Janik et al. 2013). We investigated spatial variation in capture by comparing 21 synchronized recording days across four sites, and temporal variation from 125 recording days at one high-use site (Aphrodite Beach). Despite dolphin vocalizations (i.e., echolocation clicks) being detected at each site, SWTs were not detected at all sites and there was high variability in capture rates among sites where SWTs were detected (range 0–21 SWTs detected). At Aphrodite Beach, 53 SWTs were captured over 6 months and discovery curves showed an initial increase in newly detected SWTs, approaching asymptote during the fourth month. A Huggins closed capture model constructed from SWT capture histories at Aphrodite Beach estimated a population of 54–68 individuals from acoustic detection, which overlaps with the known population size (54–76 individuals—Elwen et al. 2019). This study demonstrates the potential power of using signature whistles as proxies for individual occurrence and in MR abundance estimation, but also highlights challenges in using this approach.

Contexts of emission of non-signature whistles in bottlenose dolphins (Tursiops truncatus) under human care

2020 ◽  
Vol 181 ◽  
pp. 104255
Author(s):  
Juliana Lopez-Marulanda ◽  
Heiko G. Rödel ◽  
Nikolaas Colpaert ◽  
Sander Vanderheul ◽  
Olivier Adam ◽  
...  
Keyword(s):  
Tursiops Truncatus ◽  
Bottlenose Dolphins ◽  
Signature Whistles ◽  
Human Care

Baseline circulating immunoglobulin G levels in managed collection and free-ranging bottlenose dolphins (Tursiops truncatus)

2009 ◽  
Vol 33 (4) ◽  
pp. 449-455 ◽  
Author(s):  
Carolina L. Ruiz ◽  
Hendrik H. Nollens ◽  
Stephanie Venn-Watson ◽  
Linda G. Green ◽  
Randall S. Wells ◽  
...  
Keyword(s):  
Immunoglobulin G ◽  
Tursiops Truncatus ◽  
Bottlenose Dolphins ◽  
Free Ranging
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