نتایج جستجو برای: marine mammals

تعداد نتایج: 134570  

F. Owfi, G. T. Braulik M. Rabbaniha,

A total of 98 marine mammal records from Iranian coastal waters of the Persian Gulf and Gulf of Oman were compiled of which 66 are previously unpublished new records.  Seventy-nine were from the Persian Gulf and 16 from the Gulf of Oman coast.  The largest numbers of records were from Qeshm Island and Bushehr Provinces. Records of finless porpoise (Neophocaena phocaenoides), Indo-pacific humpba...

Journal: :Science 2000
T M Williams R W Davis L A Fuiman J Francis B J Le Boeuf M Horning J Calambokidis D A Croll

Locomotor activity by diving marine mammals is accomplished while breath-holding and often exceeds predicted aerobic capacities. Video sequences of freely diving seals and whales wearing submersible cameras reveal a behavioral strategy that improves energetic efficiency in these animals. Prolonged gliding (greater than 78% descent duration) occurred during dives exceeding 80 meters in depth. Gl...

2012
S. K. Hooker A. Fahlman M. J. Moore N. Aguilar de Soto Y. Bernaldo de Quirós A. O. Brubakk D. P. Costa A. M. Costidis S. Dennison K. J. Falke A. Fernandez M. Ferrigno J. R. Fitz-Clarke M. M. Garner D. S. Houser P. D. Jepson D. R. Ketten P. H. Kvadsheim P. T. Madsen N. W. Pollock D. S. Rotstein T. K. Rowles S. E. Simmons W. Van Bonn P. K. Weathersby M. J. Weise T. M. Williams P. L. Tyack

Decompression sickness (DCS; 'the bends') is a disease associated with gas uptake at pressure. The basic pathology and cause are relatively well known to human divers. Breath-hold diving marine mammals were thought to be relatively immune to DCS owing to multiple anatomical, physiological and behavioural adaptations that reduce nitrogen gas (N(2)) loading during dives. However, recent observati...

Journal: :Current Biology 2016
Danuta Maria Wisniewska Mark Johnson Jonas Teilmann Laia Rojano-Doñate Jeanne Shearer Signe Sveegaard Lee A. Miller Ursula Siebert Peter Teglberg Madsen

The question of how individuals acquire and allocate resources to maximize fitness is central in evolutionary ecology. Basic information on prey selection, search effort, and capture rates are critical for understanding a predator's role in its ecosystem and for predicting its response to natural and anthropogenic disturbance. Yet, for most marine species, foraging interactions cannot be observ...

Journal: :Diseases of aquatic organisms 2008
M J Moore R J Gast A L Bogomolni

The role of marine birds, mammals, turtles and fish as vectors of infectious agents of potential risk to humans can be examined from a variety of perspectives. The studies in this DAO Special include a broad survey of multiple agents and species, a sequencing study of Giardia intestinalis haplotypes known to be pathogenic to humans, an assessment of risks to humans working with marine mammals, ...

Journal: :Journal of applied physiology 2000
T J Goodwin L Coate-Li R M Linnehan T G Hammond

This study established two- and three-dimensional renal proximal tubular cell cultures of the endangered species bowhead whale (Balaena mysticetus), developed SV40-transfected cultures, and cloned the 61-amino acid open reading frame for the metallothionein protein, the primary binding site for heavy metal contamination in mammals. Microgravity research, modulations in mechanical culture condit...

Journal: :Veterinary pathology 2006
S J Newman S A Smith

A review of the published literature indicates that marine mammal neoplasia includes the types and distributions of tumors seen in domestic species. A routine collection of samples from marine mammal species is hampered, and, hence, the literature is principally composed of reports from early whaling expeditions, captive zoo mammals, and epizootics that affect larger numbers of animals from a s...

Journal: :American journal of physiology. Regulatory, integrative and comparative physiology 2016
Andreas Fahlman Michael J Moore Andrew W Trites David A S Rosen Martin Haulena Nigel Waller Troy Neale Ming Yang Stephen R Thom

Recent studies of stranded marine mammals indicate that exposure to underwater military sonar may induce pathophysiological responses consistent with decompression sickness (DCS). However, DCS has been difficult to diagnose in marine mammals. We investigated whether blood microparticles (MPs, measured as number/μl plasma), which increase in response to decompression stress in terrestrial mammal...

Journal: :Molecular biology and evolution 2016
Maria Chikina Joseph D Robinson Nathan L Clark

Mammal species have made the transition to the marine environment several times, and their lineages represent one of the classical examples of convergent evolution in morphological and physiological traits. Nevertheless, the genetic mechanisms of their phenotypic transition are poorly understood, and investigations into convergence at the molecular level have been inconclusive. While past studi...

2014
Z. Daniel Deng Brandon L. Southall Thomas J. Carlson Jinshan Xu Jayson J. Martinez Mark A. Weiland John M. Ingraham

The spectral properties of pulses transmitted by three commercially available 200 kHz echo sounders were measured to assess the possibility that marine mammals might hear sound energy below the center (carrier) frequency that may be generated by transmitting short rectangular pulses. All three sounders were found to generate sound at frequencies below the center frequency and within the hearing...

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