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Articles 1 - 6 of 6
Full-Text Articles in Life Sciences
Effects Of Size And Temperature On Developmental Time, James Gillooly, Eric Charnov, Geoffrey West, Van Savage, James Brown
Effects Of Size And Temperature On Developmental Time, James Gillooly, Eric Charnov, Geoffrey West, Van Savage, James Brown
Biology Faculty & Staff Publications
Body size and temperature are the two most important variables affecting nearly all biological rates and times. The relationship of size and temperature to development is of particular interest, because during ontogeny size changes and temperature often varies. Here we derive a general model, based on first principles of allometry and biochemical kinetics, that predicts the time of ontogenetic development as a function of body mass and temperature. The model fits embryonic development times spanning a wide range of egg sizes and incubation temperatures for birds and aquatic ectotherms (fish, amphibians, aquatic insects and zooplankton). The model also describes nearly …
Shrimp Adjust Their Sex Ratio To Fluctuating Age Distributions, Eric Charnov, Robert Hannah
Shrimp Adjust Their Sex Ratio To Fluctuating Age Distributions, Eric Charnov, Robert Hannah
Biology Faculty & Staff Publications
Long-term data sets that quantitatively confirm basic ecological theory are rare for field populations. Highly variable recruitment often causes wide temporal variation in population age distribution and basic theory for adaptive sex ratio often predicts sex ratio tracking' to match the fluctuating age distribution. Using sex-changing shrimp as a model system, we test this in a new data set of 20 years duration. The new data support the theory, despite intense fishery exploitation that itself has greatly altered the age distribution in recent years.
Reproductive Effort, Offspring Size And Benefit/Cost Ratios In The Classification Of Life Histories, Eric Charnov
Reproductive Effort, Offspring Size And Benefit/Cost Ratios In The Classification Of Life Histories, Eric Charnov
Biology Faculty & Staff Publications
There have been many attempts to document links between reproductive allocation and factors such as adult body size and demography. This paper suggests that among closely related taxa, two dimensionless numbers, each a benefit—cost ratio summarizing reproductive timing, allocation and demography, are invariants and thus are useful to classify life histories. The two numbers are E/α and C·E, where E is average adult life span,α is age-at-first-reproduction and C is average mass (per adult) devoted to reproduction per unit of time, divided by the average adult body mass (m); C is usually called reproductive effort'. Since E−1 is the average …
Biomphalaria Glabrata Field Isolate (Bb02) Collected For Construction Of Bac Library, Coen Adema
Biomphalaria Glabrata Field Isolate (Bb02) Collected For Construction Of Bac Library, Coen Adema
Biomphalaria Genome Initiative
No abstract provided.
Specimen Catalog, Part 4, Brian D. Frank
Specimen Catalog, Part 4, Brian D. Frank
Division of Mammals - Field Notes and Catalogs
No abstract provided.
Specimen Catalog, Part 3, Brian D. Frank
Specimen Catalog, Part 3, Brian D. Frank
Division of Mammals - Field Notes and Catalogs
No abstract provided.