منابع مشابه
Auditory Thresholds of a Killer Whale Orcinus orca Linnaeus
Using standard operant conditioning techniques, a killer whale, Oreinns orca Linnaeus, was trained to respond to pure-tone auditory signals by pushing a response manipulandum. An audiogram was obtained for frequencies between 500 Hz and 31 kHz. Greatest sensitivity to the signal was observed at 15 kHz at a level of --70+5 dB re I dyn/cm 2. The observed upper limit of hearing was 32 kHz. At no t...
متن کاملOrcinus orca – Killer Whale
Taxonomic notes: Orcinus orca is currently considered a single, cosmopolitan species, however many populations (including some which occur sympatrically) are ecologically, genetically and morphologically distinct (Rice 1998; Ford 2009). Despite such distinction, the global genetic diversity of the species appears low at both mitochondrial and nuclear DNA markers (Hoelzel et al. 2002; Morin et a...
متن کاملOrca (Orcinus orca) captivity and vulnerability to mosquito-transmitted viruses
Although unreported in wild orca populations, mosquito-transmitted diseases have killed at least two captive orcas (Orcinus orca) in U.S. theme parks. St. Louis Encephalitis Virus (SLEV) was implicated in the 1990 death of the male orca Kanduke, held at SeaWorld of Florida. In the second case, West Nile Virus (WNV) killed male orca Taku at SeaWorld of Texas in 2007. Captive environments increas...
متن کاملKiller whales (Orcinus orca) produce ultrasonic whistles.
This study reports that killer whales, the largest dolphin, produce whistles with the highest fundamental frequencies ever reported in a delphinid. Using wide-band acoustic sampling from both animal-attached (Dtag) and remotely deployed hydrophone arrays, ultrasonic whistles were detected in three Northeast Atlantic populations but not in two Northeast Pacific populations. These results are inc...
متن کاملA chromosomal analysis of Nepa cinerea Linnaeus, 1758 and Ranatra linearis (Linnaeus, 1758) (Heteroptera, Nepidae)
An account is given of the karyotypes and male meiosis of the Water Scorpion Nepa cinerea Linnaeus, 1758 and the Water Stick Insect Ranatra linearis (Linnaeus, 1758) (Heteroptera, Nepomorpha, Nepidae). A number of different approaches and techniques were tried: the employment of both male and female gonads and mid-guts as the sources of chromosomes, squash and air-drying methods for chromosome ...
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ژورنال
عنوان ژورنال: Biodiversity Journal
سال: 2021
ISSN: 2039-0394,2039-0408
DOI: 10.31396/biodiv.jour.2021.12.1.i.ii