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Related Concept Videos

Decreased pulse rate01:14

Decreased pulse rate

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Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
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Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
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The study of music provides many examples of the superposition of waves and the constructive and destructive interference that occurs. Very few examples of music being performed consist of a single source playing a single frequency for an extended period of time. A single frequency of sound for an extended period might be monotonous to the point of irritation, similar to the unwanted drone of an aircraft engine or a loud fan. Music is pleasant and exciting due to mixing the changing frequencies...
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When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
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Inter-annual decrease in pulse rate and peak frequency of Southeast Pacific blue whale song types.

Franck Malige1, Julie Patris2, Susannah J Buchan3,4,5

  • 1Univ. Toulon, Aix Marseille Univ., CNRS, LIS, DYNI team, SABIOD, Marseille, France. franck.malige@lis-lab.fr.

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Summary
This summary is machine-generated.

Southeast Pacific blue whale songs are decreasing in frequency over decades. Acoustic analysis reveals a consistent decline in both common and scarce song types, indicating a significant shift in whale vocalizations.

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Area of Science:

  • Marine biology
  • Bioacoustics
  • Animal communication

Background:

  • Blue whale (Balaenoptera musculus) populations are recovering in the southeast Pacific.
  • Understanding changes in blue whale song is crucial for population monitoring and conservation.
  • Vocalizations play a key role in blue whale communication and social behavior.

Purpose of the Study:

  • To analyze long-term trends in the frequency of two southeast Pacific blue whale song types.
  • To assess the rate of frequency decline in blue whale vocalizations.
  • To investigate potential drivers of observed frequency shifts in blue whale songs.

Main Methods:

  • Utilized acoustic data from multiple sources in the eastern Pacific Ocean (Equator to Chilean Patagonia).
  • Measured pulse rate and peak frequency of song units using summed auto-correlation and Fourier transform.
  • Assessed sources of error for each measurement method.

Main Results:

  • A linear decline in pulse rate and peak frequency was observed for southeast Pacific song type n.2 (1997-2017).
  • A similar frequency decline was found for the scarcer southeast Pacific song type n.1 (1970-2014).
  • Both song types exhibit comparable rates of frequency decrease.

Conclusions:

  • Both common and scarce southeast Pacific blue whale song types are experiencing significant frequency declines.
  • The consistent decline across different song types suggests a widespread phenomenon in this population.
  • Further research is needed to understand the ecological and behavioral implications of these vocalization changes.