Do female fish prefer to spawn in nests with eggs for reasons of mate choice copying or egg survival?

Article Abstract:

The example of female copying in fish species with external fertilization and male parental care does not conform to the spirit of the definition of mate choice copying as proposed by Pruett-Jones. Female choice for spawning in nests with eggs is possibly related to the presence of eggs directly affecting egg survival than to eggs pointing to a previous female's mate choice. This is treated as a specific female behavior associated with spawning site selection as opposed to male choice.

Analysis, Ichthyological research, Ichthyology, Spawning

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Velocity fields in deforming Asia from the inversion of earthquake-released strains

Article Abstract:

A fifth-order polynomial function is used to obtain the relative velocities and rotations occurring in the regions surrounding the Eastern Himalayan syntaxis. This method is also applied to strain rates obtained from both modern and historic earthquakes. Lastly, instantaneous rotation rates within the deforming region, extrapolated over 20-40 million years, are in rough agreement with the paleomagnetic rotations measured in Cretaceous-aged rocks.

Asia, Geology, Structural, Structural geology, Cretaceous period, Paleogeography

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A new method to measure the terminal velocity of small particles: a demonstration using ascending eggs of the Atlantic menhaden (Brevoortia tyrannus)

Article Abstract:

A new method has been developed for measuring the terminal velocity of particles in aqueous media, which is demonstrated with a study of the effect of salinity and developmental stage on the rate of ascent of eggs of the Atlantic menhaden, Brevoortia tyrannus. The method uses video, motion analysis, and a novel experimental apparatus.

Statistical Data Included, Measurement, Fishes, Menhaden, Speed, Velocity, Fish eggs

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