Relevant bibliographies by topics / Pygmy sperm whale

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Academic literature on the topic 'Pygmy sperm whale'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Pygmy sperm whale"

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Leone, Angelique, Michael Dark, Hirotaka Kondo, David S. Rotstein, Matti Kiupel, Michael T. Walsh, Claire Erlacher-Reid, Nadia Gordon, and Julia A. Conway. "GASTROINTESTINAL LEIOMYOSARCOMA IN A PYGMY SPERM WHALE (KOGIA BREVICEPS)." Journal of Zoo and Wildlife Medicine 44, no. 3 (September 2013): 744–48. http://dx.doi.org/10.1638/2012-0147r.1.

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Credle, V. R. "Iron particles isolated from the dura of pygmy sperm whales Kogia breviceps." Proceedings, annual meeting, Electron Microscopy Society of America 45 (August 1987): 834–35. http://dx.doi.org/10.1017/s0424820100128456.

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Magnetite, a highly magnetic iron oxide, is a biomineralization product found in organisms sensitive to the earth's magnetic field. Biogenically produced magnetite differs from magnetite-bearing rocks of geological origin in crystalline morphology, size, and elemental composition. Standard paleomagnetic methods indicate that cetacean brain dura may also contain magnetite. Correllations have been documented between the distribution of cetacean live stranding events and anomalously minimal magnetic field intensities. This would suggest magnetoreceptive abilities in whales. Pygmy sperm whales are one of the most common cetaceans to strand alive in Florida. Therefore, it is of interest to determine whether pygmy sperm whale brain contains magnetite, as this will establish sensitivity to variations in the earth's magnetic field. Reported here are the results of isolation experiments to ascertain whether iron-rich particles are present in pygmy sperm whales, Kogia breviceps.
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Harms, Craig A., Rachel Lo Piccolo, David S. Rotstein, and Aleta A. Hohn. "Struvite Penile Urethrolithiasis in a Pygmy Sperm Whale (Kogia breviceps)." Journal of Wildlife Diseases 40, no. 3 (July 2004): 588–93. http://dx.doi.org/10.7589/0090-3558-40.3.588.

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Measures, Lena, Benoît Roberge, and Richard Sears. "Stranding of a Pygmy Sperm Whale, Kogia breviceps, in the Northern Gulf of St. Lawrence, Canada." Canadian Field-Naturalist 118, no. 4 (October 1, 2004): 495. http://dx.doi.org/10.22621/cfn.v118i4.52.

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A Pygmy Sperm Whale, Kogia breviceps, stranded alive and later died in the Northern Gulf of St. Lawrence, Quebec, Canada on 28 August 2001. This is the northern-most stranding of this species in the western Atlantic. The whale was estimated to be approximately 3 m long and a longitudinal section from one tooth (31 mm long and 5.0 mm in diameter) revealed 3.5 growth layer groups.
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Martinez-Pastor, F., V. Garcia-Macias, J. Garcia, M. Alvarez, E. Anel, P. Herraez, P. de Paz, and L. Anel. "223 DESCRIPTION OF GENITALIA AND SPERM RECOVERED POSTMORTEM FROM A PYGMY SPERM WHALE, KOGIA BREVICEPS." Reproduction, Fertility and Development 18, no. 2 (2006): 219. http://dx.doi.org/10.1071/rdv18n2ab223.

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A pygmy sperm whale (Kogia breviceps; adult male; 350 kg) was stranded and died on a beach near Cabo Bustos (Asturias, North of Spain) on March 12th, 2005. Finding specimens of this species is a rare event on Spanish shores, although this whale is not considered endangered. Postmortem examination was performed 24 h later. Genitalia (testicles and epididymides) were extracted. The postmortem report indicated that vas deferens and seminal glands seemed to contain an important amount of semen, which was not recovered. Refrigerated genitalia were send to our laboratory, arriving around 40 h postmortem. The refrigerated testicles were in poor physical condition upon arrival, indicating advanced tissue detoriation. The epididymides (very long) were not closely attached to the testicles, but were connected by a loose conjunctive membrane. We divided the epididymides into four regions that approximated the (1) caput, (2) mid-region, (3) corpus, and (4) cauda. Physical characteristics of the genitalia are described in Table 1. The left testicle was larger, and possibly more active, than the right one. A sperm sample was obtained from the cauda region after incising the tissue. Osmolality and pH of the sample were 428 mOsm/kg and 6.62, respectively (maybe due to tissue breakdown) and the sperm concentration was 1194 × 106/mL. Spermatozoa were immotile, even after diluting in buffered medium; it is possible that postmortem damage occurred quickly. However, using flow cytometry we determined that 57% of cauda spermatozoa had intact plasma membranes and acrosomes (determined by staining with 37 mmol/mL propidium iodide and 1 μg/mL PNA-FITC; Sigma, Madrid, Spain). Examination by phase contrast microscopy (×600) showed many spermatozoa with abnormal heads and bent midpieces and flagella, even in the cauda (13% and 21%, respectively). Sperm head morphometry was studied using DiffQuick staining and an automated analysis system (SCA2000; Microptic, Barcelona, Spain). Mean sperm head size was 3.71 ± 0.19 × 2.61 ± 0.12 μm in width and length, respectively. Computer analysis (AnalySiS-GmbH, Cologne, Germany) of phase contrast images revealed that the mean size of the sperm midpiece and flagellum were 3.44 ± 0.19 and 40.95 ± 2.02 μm, respectively. The information obtained after postmortem recovery of the testes and epididymis should be useful to future conservation efforts of the pygmy sperm whale and similar species. The rapid deterioration of the testicular tissue by 40 h postmortem was not expected since good quality sperm samples have been obtained at similar postmortem intervals in other species. Therefore, we recommend that postmortem sperm recovery should be accomplished as rapidly as possible in this species. Table 1. Genitalia measurements
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Yang, Wei-Cheng, Victor Fei Pang, Chian-Ren Jeng, Lien-Siang Chou, and Ling-Ling Chueh. "Morbilliviral infection in a pygmy sperm whale (Kogia breviceps) from Taiwanese waters." Veterinary Microbiology 116, no. 1-3 (August 2006): 69–76. http://dx.doi.org/10.1016/j.vetmic.2006.03.014.

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Dunn, Charlotte, and Diane Claridge. "Killer whale (Orcinus orca) occurrence and predation in the Bahamas." Journal of the Marine Biological Association of the United Kingdom 94, no. 6 (August 6, 2013): 1305–9. http://dx.doi.org/10.1017/s0025315413000908.

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Killer whales (Orcinus orca) have a cosmopolitan distribution, yet little is known about populations that inhabit tropical waters. We compiled 34 sightings of killer whales in the Bahamas, recorded from 1913 to 2011. Group sizes were generally small (mean = 4.2, range = 1–12, SD = 2.6). Thirteen sightings were documented with photographs and/or video of sufficient quality to allow individual photo-identification analysis. Of the 45 whales photographed, 14 unique individual killer whales were identified, eight of which were re-sighted between two and nine times. An adult female (Oo6) and a now-adult male (Oo4), were first seen together in 1995, and have been re-sighted together eight times over a 16-yr period. To date, killer whales in the Bahamas have only been observed preying on marine mammals, including Atlantic spotted dolphin (Stenella frontalis), Fraser's dolphin (Lagenodelphis hosei), pygmy sperm whale (Kogia breviceps) and dwarf sperm whale (Kogia sima), all of which are previously unrecorded prey species for Orcinus orca.
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Rousselet, Estelle, Megan Stolen, Wendy N. Durden, Teresa Jablonski, Nicole I. Stacy, and David S. Rotstein. "Bilateral Polycystic Kidneys and Focal Renal Cystadenoma in a Pygmy Sperm Whale (Kogia breviceps)." Journal of Wildlife Diseases 55, no. 1 (January 1, 2019): 258. http://dx.doi.org/10.7589/2018-01-019.

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Ostrom, Peggy H., Jon Lien, and Stephen A. Macko. "Evaluation of the diet of Sowerby's beaked whale, Mesoplodon bidens, based on isotopic comparisons among northwestern Atlantic cetaceans." Canadian Journal of Zoology 71, no. 4 (April 1, 1993): 858–61. http://dx.doi.org/10.1139/z93-110.

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Sowerby's beaked whale, Mesoplodon bidens, is a poorly known and infrequently encountered species. Consequently, its behavior and habitat requirements are largely unknown. Evidence of the trophic level and diet of M. bidens was obtained through a comparison of δ13C and δ15N values for this species with those for eight other cetaceans and the basking shark, Cetorhinus maximus. The δ13C value for M. bidens (−18.5 ± 1.1‰) was similar to that for all other cetaceans (−18.7 to −17.2‰) except the sperm whale, Physeter macrocephalus, and the blue whale, Balaenoptera musculus (−22.8 and −20.1‰, respectively). At least a portion of the range of δ13C values for the cetaceans and the basking shark is thought to be related to variations in the lipid content of the samples. Nitrogen isotope values appear to reflect trophic position. Based on δ15N, organisms can be ordered along a trophic continuum bracketed by the planktivorous basking shark (9.9‰) and the piscivorous white-beaked dolphin, Lagenorhynchus albirostris (16.2‰). The trophic position of M. bidens (δ15N = 11.7‰) is intermediate between those of the pygmy sperm whale, Kogia breviceps (δ15N = 11.9‰), and the sperm whale, Physeter macrocephalus (δ15N = 11.1‰), and thus supports previous suggestions that these species feed at similar trophic positions. The estimated δ15N value of the diet of M. bidens, 8.7‰, is consistent with a diet that has a large contribution from small offshore squid, δ15N = 9.3‰.
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Stamper, M. Andrew, Brent R. Whitaker, and T. David Schofield. "CASE STUDY: MORBIDITY IN A PYGMY SPERM WHALE KOGIA BREVICEPS DUE TO OCEAN-BOURNE PLASTIC." Marine Mammal Science 22, no. 3 (July 2006): 719–22. http://dx.doi.org/10.1111/j.1748-7692.2006.00062.x.

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Dissertations / Theses on the topic "Pygmy sperm whale"

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Plön, Stephanie. "The status and natural history of pygmy (Kogia breviceps) and dwarf (K. sima) sperm whales off Southern Africa." Thesis, Rhodes University, 2005. http://hdl.handle.net/10962/d1005460.

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For the present study 106 strandings of Kogia breviceps and 85 strandings of K. sima along the South African coastline between 1880 and 1995 were analysed in order to examine the age and growth, male and female reproduction, diet, stranding patterns, and population genetic structure of both species. Length and weight at birth were about 120cm and 53kg for K. breviceps and about 103cm and 14kg for K. sima. Von Bertalanffy growth curves were fitted to the data and indicated that physical maturity was reached at around 15 years in both sexes of K. breviceps and at 13 years in female and 15 years in male K. sima. Asymptotic length was reached at 306.0 and 286.1cm in female and male K. breviceps and 249.14 and 263.75cm in female and male K. sima, respectively. Maximum ages were16 years for male K. breviceps and 23 years for females and 17 years for male K. sima and 22 years for females. Reversed sexual size dimorphism was suggested for K. breviceps, while in K. sima males were larger than females. Attainment of sexual maturity in males occurred at between 2.5 and 5 years of age in K. breviceps and 2.6 and 3 years in K. sima, corresponding to 241-242cm and 197cm body length, respectively. The maximum combined testis weight comprised 1.04% and 2.00% for K. breviceps and K. sima, respectively, and a polygynous mating system with a roving male strategy was proposed for both species. The sperm morphology for both Kogia species was described and is characterised by 20-25 spherical mitochondria arranged in rows around the midpiece. Attainment of sexual maturity in females occurred at 5 years in both Kogia species, and at 262cm and 215cm body length in K. breviceps and K. sima, respectively. The ovulation rates were 0.9 and 0.7 per year for K. breviceps and K. sima, respectively. In K. breviceps conceptions occurred from April to September and births from March to August, while in K. sima both conceptions and births occurred from December to March. Annual reproduction and a post-partum oestrus was suggested for both Kogia species. The diet of K. breviceps comprised 50 different cephalopod species from 22 families and 17 other prey species, while K. sima fed on 32 cephalopod species from 17 families and six others. Although niche overlap indices between the two species and between groups within each species were high, some differences in diet could be determined, which allow these two sympatrically occurring species to share the same ecological niche off the coast of Southern Africa. An analysis of the stranding patterns revealed that K. sima has a closer affinity to the Agulhas current and to higher water temperatures than K. breviceps, which is supported by differences in the size of the appendages between the two species. The population genetic analysis revealed a high haplotype and nucleotide diversity for K. breviceps in the Southern hemisphere, but a lack of significant phylogeographic structure, indicating substantial gene flow among populations and inhibiting genetic differentiation of local populations, although the South African population was somewhat isolated from others in the Southern Hemisphere. In contrast the data on the phylogeographic structure of K. sima were somewhat restrictive as the majority of the samples originated from South Africa. Nevertheless, both nucleotide and haplotype diversities were markedly lower than in K. breviceps and more similar to those for other small cetacean populations, suggesting a smaller population size for K. sima than for K. breviceps. Although both Kogia species belong to the medium to larger-sized odontocetes their life histories are located near the fast end of the slow-fast continuum of life histories of marine mammals, indicating high mortality rates. The “false-gill” marking and the ability to squirt ink are thought to reflect adaptations to predator mimicry and avoidance.
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Piscitelli, Marina A. "Comparing thoracic morphology and lung size in shallow (Tursiops truncatus) and (Kogia spp.) diving cetaceans." View electronic thesis (PDF), 2009. http://dl.uncw.edu/etd/2009-1/r1/piscitellim/marinapiscitelli.pdf.

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O'Brien, Nicole M. "An Analysis of Dwarf and Pygmy Sperm Whale (Kogia sp.) Stranding Data in the Southeast United States." NSUWorks, 2008. http://nsuworks.nova.edu/occ_stuetd/244.

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Pygmy sperm whales (Kogia breviceps) and dwarf sperm whales (Kogia sima) strand frequently in the southeastern United States (SEUS). To detect seasonal trends in Kogia sp. strandings across the SEUS, all 979 stranding events from 1977 through 2005 were segregated by month. A peak in strandings occurred in the late summer and early fall (July – October). The entire SEUS was divided into segments of similar coastline orientation, 1) North and South Carolina, 2) Georgia and the east coast of Florida, 3) Florida Keys, 4) west coast of Florida, 5) Florida panhandle, Alabama and Mississippi, 6) Louisiana and 6) Texas. Most areas displayed a significant peak in strandings in summer and a smaller significant peak in winter. A seasonal index analysis of the strandings revealed the same pattern as the general seasonal analysis. Analysis of wind direction changes preceding stranding events revealed six patterns. The most common pattern was when winds shifted from downwelling-favorable to upwelling-favorable during the week prior to a stranding. Analysis of sea level confirmed that when wind was upwelling-favorable, sea level decreased and when wind was downwelling-favorable, sea level increased. Seasonal upwelling along central Florida’s Atlantic coast observed in the summer correlates with upwelling-favorable wind patterns during summer months, and increased Kogia sp. strandings. A smaller peak in strandings that occurs in the winter months appears to occur when there is a shift from the ‘normal’ downwelling-favorable conditions into a brief period of upwelling-favorable conditions. Along Florida’s Atlantic coast, distances to isobaths from stranding sites were not significantly different from distances of randomly selected sites to isobaths; however, there is a tendency towards shorter distances to isobaths. Along the Georgia, South Carolina and North Carolina coast, distances to isobaths from strandings sites are significantly different from distances of randomly selected sites to isobaths. The distinctive bathymetry of the SEUS Atlantic coast may contribute to strandings across the entire SEUS Atlantic coast. Analysis of the frequency of Kogia sp. strandings during the lunar cycle revealed no significant correlation between strandings and lunar day. Both wind direction and bathymetry may influence frontal structures and water movements, and thus abiotic environmental factors may be significant factors in determining the locations and timing of Kogia sp. stranding events.
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Montey, Nicole R. "Investigation of pygmy sperm whale (Kogia breviceps ) populations in the southeastern United States using stable isotopes of carbon, nitrogen, and oxygen in teeth." Thesis, College of Charleston, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1587301.

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The pygmy sperm whale (Kogia breviceps) is currently the second-most commonly stranded cetacean in the Southeastern United States (SEUS), but information concerning their population structure is severely limited. This study utilized stable isotope analysis to investigate the possible migratory patterns and population structure of K. breviceps among six different regions in the SEUS. Combined growth layers from different regions of the teeth were subsampled via dental drill and analyzed representing four different age classes: calf, juvenile, sub-adult, and adult, as well as four yearlings that had stranded with their mothers. Stable isotope ratios of carbon and nitrogen were measured in the organic component of 46 teeth, and oxygen isotope ratios were measured in the inorganic (hydroxyapatite) component of 21 teeth obtained from stranded individuals. There was a high degree of individual variability in δ13C, δ 15N, and δ18O resulting in no significant differences between the six different regions: South Carolina, Georgia, Northern, Central, and Southern Florida, and the Gulf of Mexico. Differences between the age classes were significant for δ13C and δ 15N. Adults exhibited significantly more negative δ13 C than subadults. These results support a previously hypothesized inshore-offshore migration for Kogia breviceps. Yearlings displayed significantly higher δ15N values than all other age classes due to nursing. A slight increase in δ15N from juvenile to adult supports a possible ontogenetic shift in the trophic level of prey. Results from this study provide the first carbon and nitrogen isotope values from different age classes of pygmy sperm whales as well as the first reported oxygen isotopes values for this species.

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Parlayan, Filiz Eanes Ritchie. "Development of inductively coupled plasma spectroscopic methods for the determination of metals in beluga (delphinapterus leucas) and pygmy sperm (kogia breviceps) whale liver samples/." [s.l.]: [s.n.], 2005. http://library.iyte.edu.tr/tezler/master/kimya/t000399.pdf.

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Thesis (Master)--İzmir Institute of Technology, İzmir, 2005
Keywords: ICP-OES, Chemometrics methods, internal standardization, matrix effects. Includes bibliographical references (leaves. 111-120).
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Scharnitz, Jennifer. "Analysis of the Acoustic Signals from Three Pygmy Sperm Whales (Kogia breviceps)." NSUWorks, 2008. http://nsuworks.nova.edu/occ_stuetd/240.

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The pygmy sperm whale, Kogia breviceps, is a small odontocete whose biology and ecology are poorly understood. The Kogiids are taxonomically classified within the Superfamily Physeteroidea due to the presence of a spermaceti organ. This organ, along with the museau de singe/dorsal bursae complex, has been identified as the site of acoustic signal generation for the superfamily. The acoustic signals of this species have been rarely analyzed. Free ranging Kogiids are difficult to locate and stranded animals rarely survive long enough for any significant studies to be undertaken. This study utilized three live-stranded male animals, two adults and one neonate, to further analyze the acoustic repertoire of Kogia breviceps. Only one type of acoustic signal was identified in this study, pulsed signals, which occurred singly and in pulse trains. Two of the animals produced short, low-frequency pulses while the third animal produced short, high-frequency pulses. The measured differences in frequency were determined to be due primarily to the sensitivity of the recording equipment as many of the pulses exceeded the maximum frequency sensitivity of the recording equipment. The calf emitted significantly more pulses than either of the adult animals. Pulses from one adult and the calf were emitted in pulse trains determined to be both passive and active echolocation pulse trains. The pulse trains emitted by the adult animals contained a maximum of 19 pulses per train while the pulse trains emitted by the calf contained a maximum of 197 pulses per train. The pulse length of the calf and the young adult was found to be similar while the interpulse intervals were more similar for the two older animals. Overall, the pulses were found to be dissimilar to those produced by the sperm whale, Physeter macrocephalus.
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Book chapters on the topic "Pygmy sperm whale"

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McAlpine, Donald F. "Pygmy and Dwarf Sperm Whales." In Encyclopedia of Marine Mammals, 786–88. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-12-804327-1.00209-0.

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Mcalpine, Donald F. "Pygmy and Dwarf Sperm Whales." In Encyclopedia of Marine Mammals, 936–38. Elsevier, 2009. http://dx.doi.org/10.1016/b978-0-12-373553-9.00212-1.

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Conference papers on the topic "Pygmy sperm whale"

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Baatz, John E., Demetri D. Spyropoulos, Annalaura Mancia, and Danforth A. Newton. "Induced Pluripotent Stem Cells Produced From Cryopreserved Pygmy Sperm Whale (Kogia Breviceps) Lung Tissue." In American Thoracic Society 2011 International Conference, May 13-18, 2011 • Denver Colorado. American Thoracic Society, 2011. http://dx.doi.org/10.1164/ajrccm-conference.2011.183.1_meetingabstracts.a3519.

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Reports on the topic "Pygmy sperm whale"

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Baird, Robin W. Movements and Habitat use of Dwarf and Pygmy Sperm Whales using Remotely-Deployed LIMPET Satellite Tags. Fort Belvoir, VA: Defense Technical Information Center, September 2013. http://dx.doi.org/10.21236/ada597799.

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Baird, Robin W. Movements and Habitat Use of Dwarf and Pygmy Sperm Whales using Remotely-Deployed LIMPET Satellite Tags. Fort Belvoir, VA: Defense Technical Information Center, September 2014. http://dx.doi.org/10.21236/ada617026.

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