New sightings of false killer whales Pseudorca crassidens (Owen, 1846) in Chile
نویسندگان
چکیده
منابع مشابه
Genetic variation and evidence for population structure in eastern North Pacific false killer whales (Pseudorca crassidens)
False killer whales (Pseudorca crassidens (Owen, 1846)) are incidentally taken in the North Pacific pelagic long-line fishery, but little is known about their population structure to assess the impact of these takes. Using mitochondrial DNA (mtDNA) control region sequence data, we quantified genetic variation for the species and tested for genetic differentiation among geographic strata. Our da...
متن کاملNuclear and mitochondrial patterns of population structure in North Pacific false killer whales (Pseudorca crassidens).
False killer whales (Pseudorca crassidens) are large delphinids typically found in deep water far offshore. However, in the Hawaiian Archipelago, there are 2 resident island-associated populations of false killer whales, one in the waters around the main Hawaiian Islands (MHI) and one in the waters around the Northwestern Hawaiian Islands (NWHI). We use mitochondrial DNA (mtDNA) control region ...
متن کاملAccounting for Subgroup Structure in Line-Transect Abundance Estimates of False Killer Whales (Pseudorca crassidens) in Hawaiian Waters
For biological populations that form aggregations (or clusters) of individuals, cluster size is an important parameter in line-transect abundance estimation and should be accurately measured. Cluster size in cetaceans has traditionally been represented as the total number of individuals in a group, but group size may be underestimated if group members are spatially diffuse. Groups of false kill...
متن کاملDecreased echolocation performance following high-frequency hearing loss in the false killer whale (Pseudorca crassidens).
Toothed whales and dolphins possess a hypertrophied auditory system that allows for the production and hearing of ultrasonic signals. Although the fossil record provides information on the evolution of the auditory structures found in extant odontocetes, it cannot provide information on the evolutionary pressures leading to the hypertrophied auditory system. Investigating the effect of hearing ...
متن کاملCharacterizing the graded structure of false killer whale (Pseudorca crassidens) vocalizations.
The vocalizations from two, captive false killer whales (Pseudorca crassidens) were analyzed. The structure of the vocalizations was best modeled as lying along a continuum with trains of discrete, exponentially damped sinusoidal pulses at one end and continuous sinusoidal signals at the other end. Pulse trains were graded as a function of the interval between pulses where the minimum interval ...
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ژورنال
عنوان ژورنال: Revista de biología marina y oceanografía
سال: 2003
ISSN: 0718-1957
DOI: 10.4067/s0718-19572003000200005