1. Small cladocerans, copepod nauplii and rotifers often dominate the zooplankton community in tropical and subtropical lakes. This is probably because of high predation pressure by small omnivorous-planktivorous fish, but experimental... more
1. Small cladocerans, copepod nauplii and rotifers often dominate the zooplankton community in tropical and subtropical lakes. This is probably because of high predation pressure by small omnivorous-planktivorous fish, but experimental evidence is scarce. 2. This study used two approaches to test the effect of the small omnivorous-planktivorous fish species Jenynsia multidentata, which is frequently abundant in (sub)tropical eutrophic lakes in South America, on the size distribution of zooplankton. In Lake Blanca (Uruguay), which lacks any piscivores, we sampled seasonally for both fish and zooplankton. We also conducted an outdoor mesocosm experiment with treatments containing or lacking J. multidentata. 3. Together, the empirical and experimental data suggest that J. multidentata predation plays an important role in modulating the size structure of the zooplankton community in subtropical lakes. In the absence of J. multidentata, stocked large-sized zooplankters like Daphnia obtus...
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... APPLICATIONS FORREST J. ROGERS Lawrence Livermore National Laboratory, PO Box 808, Livermore, CA 94550 FRITZ J. SWENSON Los Alamos Astrophysics, Los Alamos National Laboratory, X-2 MS B220, Los Alamos, NM 87545 CARLOS A. IGLESIAS... more
... APPLICATIONS FORREST J. ROGERS Lawrence Livermore National Laboratory, PO Box 808, Livermore, CA 94550 FRITZ J. SWENSON Los Alamos Astrophysics, Los Alamos National Laboratory, X-2 MS B220, Los Alamos, NM 87545 CARLOS A. IGLESIAS Lawrence ...
Research Interests: Physics, Organic Chemistry, Stellar Evolution, Astrophysical Plasma, Equations of State, and 14 moreAstrophysics, Entropy, Integer quantum hall effect, Plasma, Opacity, Free Energy, Stars, Ionization, Analytical Solution, Bound States, Partition Function, Numerical Solution, Equation of State, and Internal Energy
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... having bound states. For example, the bound state contribution to the two-body trace is b2,~d = ~ g~[exp(-E~/kT) - 1 + E~/kT] , (1) j(bound) with g~ the level degeneracy, E~ the level energy, and kT the temperature in energy units. ...
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... Iglesias & Rogers (1991) have shown that the opacity increases in the temperature range of interest here are almost the same along relevant tracks of constant R - p/T~. Since the TABLE 1 track for B ... This implies a very... more
... Iglesias & Rogers (1991) have shown that the opacity increases in the temperature range of interest here are almost the same along relevant tracks of constant R - p/T~. Since the TABLE 1 track for B ... This implies a very narrow instability strip on the Hertzsprung-Russell diagram. ...
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... Printed in USA RADIATIVE OPACITIES FOR CARBON-AND OXYGEN-RICH MIXTURES CARLOS A. IGLESIAS AND FORREST J. ROGERS ... 1970b, ApJS, 19, 261 Cox, AN, Stewart, JN, & Eilers, DD 1965, ApJS, 1 1, 1 Cox, AN, & Tabor, JE 1976,... more
... Printed in USA RADIATIVE OPACITIES FOR CARBON-AND OXYGEN-RICH MIXTURES CARLOS A. IGLESIAS AND FORREST J. ROGERS ... 1970b, ApJS, 19, 261 Cox, AN, Stewart, JN, & Eilers, DD 1965, ApJS, 1 1, 1 Cox, AN, & Tabor, JE 1976, ApJS, 31, 271 Da Silva, A., et ...
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We have undertaken a long-term effort to provide improved Rosseland mean opacity tables. In the present paper we present a method to expand our existing tables to include arbitrary values of hydrogen mass fraction. This task was greatly... more
We have undertaken a long-term effort to provide improved Rosseland mean opacity tables. In the present paper we present a method to expand our existing tables to include arbitrary values of hydrogen mass fraction. This task was greatly simplified by showing that there exists a correspondence in the equation of state and opacity for sets of mixtures with the same temperature and electron density, but different mass density and composition. Tables for mixtures of variables hydrogen and metal mass fractions as well as the metal constituents can be readily calculated.