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Related Concept Videos

Range00:59

Range

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The range is one of the measures of variation. It can be defined as the difference between a dataset's highest and lowest values. For example, in the study of seven 16-ounce soda cans, the filled volume of soda was measured, thus producing the following amount (in ounces) of soda:
15.9; 16.1; 15.2; 14.8; 15.8; 15.9; 16.0; 15.5
Measurements of the amount of soda in a 16-ounce can vary since different subjects record these measurements or since the exact amount - 16 ounces of liquid, was not...
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¹H NMR: Long-Range Coupling01:27

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Heat and Free Expansion

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The work done by a thermodynamic system depends not only on the initial and final states but also on the intermediate states—that is, on the path. Like work, when heat is added to a thermodynamic system, it undergoes a change of state, and the state attained depends on the path from the initial state to the final state. Consider an ideal gas cylinder fitted with a piston. When the cylinder is heated at a constant temperature, the gas molecules absorb energy and expand slowly in a...
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Speed of Sound in Gases01:08

Speed of Sound in Gases

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The speed of sound in a gaseous medium depends on various factors. Since gases constitute molecules that are free to move, they are highly compressible. Hence, sound waves travel slowly through gases. Thermodynamics helps us understand the relationship between pressure, volume, and temperature of gases, thus, the speed of sound in an ideal gas can be determined using the laws of thermodynamics. At the same time, Newton's laws of motion and the continuity equation of fluid dynamics also come...
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Speed of a Transverse Wave01:13

Speed of a Transverse Wave

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The speed of a wave depends on the characteristics of the medium. For example, in the case of a guitar, the strings vibrate to produce the sound. The speed of the waves on the strings and the wavelength determine the frequency of the sound produced. The strings on a guitar have different thicknesses but may be made of similar material. They have different linear densities, and the linear density is defined as the mass per length.
One of the key properties of any wave is the wave speed. Light...
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Distribution of Molecular Speeds01:27

Distribution of Molecular Speeds

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The motion of molecules in a gas is random in magnitude and direction for individual molecules, but a gas of many molecules has a predictable distribution of molecular speeds. This predictable distribution of molecular speeds is known as the Maxwell-Boltzmann distribution. The distribution of molecular speeds in liquids is comparable to that of gases but not identical and can help to understand the phenomenon of the boiling and vapor pressure of a liquid. Consider that a molecule requires a...
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Warming speeds up range expansion in an experimental model system.

Kayley Breslin1, Tess N Grainger1

  • 1Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada.

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Higher temperatures accelerate species range expansion by increasing both movement and population growth. Understanding temperature effects on dispersal is crucial for predicting climate change impacts on biodiversity.

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Area of Science:

  • Ecology
  • Climate Change Biology
  • Evolutionary Biology

Background:

  • Climate change is driving species range shifts.
  • Temperature influences range shifts, but its effect on expansion speed is unclear.
  • Warmer temperatures may increase dispersal and population growth, accelerating range expansion.

Purpose of the Study:

  • To investigate how temperature affects the rate of species range expansion.
  • To determine if temperature influences dispersal and population growth rates.

Main Methods:

  • Populations of the flour beetle (Tribolium castaneum) were grown in connected landscapes at three temperatures (27.5, 30, and 32.5°C).
  • Range expansion was tracked for 18 weeks.
  • Separate assays measured temperature effects on dispersal probability and population growth rates.

Main Results:

  • Beetles at 32.5°C showed the fastest range expansion.
  • Increased temperatures enhanced both dispersal probability and population growth rates.
  • Both density-independent dispersal and density-dependent population growth contributed to faster range expansion.

Conclusions:

  • Temperature significantly impacts the rate of species range expansion.
  • Understanding temperature-driven changes in dispersal and population growth is key to predicting climate change-induced range shifts.
  • This research underscores the need to incorporate temperature effects into models of species redistribution.