The social evolution of dispersal with public goods cooperation

Selection can favour the evolution of individually costly dispersal if this alleviates competition between relatives. However, conditions that favour altruistic dispersal also mediate selection for other social behaviours, such as public goods cooperation, which in turn is likely to mediate dispersal evolution. Here, we investigate – both experimentally (using bacteria) and theoretically – how social habitat heterogeneity (i.e. the distribution of public goods cooperators and cheats) affects the evolution of dispersal. In addition to recovering the well-known theoretical result that the optimal level of dispersal increases with genetic relatedness of patch mates, we find both mathematically and experimentally that dispersal is always favoured when average patch occupancy is low, but when average patch occupancy is high, the presence of public goods cheats greatly alters selection for dispersal. Specifically, when public goods cheats are localized to the home patch, higher dispersal rates are favoured, but when cheats are present throughout available patches, lower dispersal rates are favoured. These results highlight the importance of other social traits in driving dispersal evolution.

Comparative genomics of the neglected human malaria parasite Plasmodium vivax

The human malaria parasite Plasmodium vivax is responsible for 25 - 40% of the similar to 515 million annual cases of malaria worldwide. Although seldom fatal, the parasite elicits severe and incapacitating clinical symptoms and often causes relapses months after a primary infection has cleared. Despite its importance as a major human pathogen, P. vivax is little studied because it cannot be propagated continuously in the laboratory except in non- human primates. We sequenced the genome of P. vivax to shed light on its distinctive biological features, and as a means to drive development of new drugs and vaccines. Here we describe the synteny and isochore structure of P. vivax chromosomes, and show that the parasite resembles other malaria parasites in gene content and metabolic potential, but possesses novel gene families and potential alternative invasion pathways not recognized previously. Completion of the P. vivax genome provides the scientific community with a valuable resource that can be used to advance investigation into this neglected species.

The magnetic phase diagram of Gd(2)Sn(2)O(7)

Measurements of the magnetic susceptibility of the frustrated pyrochlore magnet Gd(2)Sn(2)O(7) have been performed at temperatures below T = 5 K and in magnetic fields up to H = 12 T. The phase boundaries determined from these measurements are mapped out in an H-T phase diagram. In this gadolinium compound, where the crystal-field splitting is small and the exchange and dipolar energy are comparable, the Zeeman energy overcomes these competing energies, resulting in at least four magnetic phase transitions below 1 K. These data are compared against those for Gd(2)Ti(2)O(7) and will, we hope, stimulate further studies.

1987 Yearbook

TOC: Clubs & Organizations…18 / Current Events & Music…30 / Faculty & Staff…33 / Activities & Events… / Honors & Graduation…65 / Graduates…75 / Yearbook Credits…111 / A Thank You…112 YEARBOOK COMMITTEE: Project Director, Vincent Banrey; Asst. Project Director, Catherine Whan; Editors (1986): Maricruz Saunders; (1987): Juan Jimenez, GloryAnn Torres; LAYOUT DESIGNERS: Vincent Banrey, Stephanie Bowen, Yvonne Brown, Jacqui Fernandez, Milton Ferreira, Omar Harris, Cornelius Huskins, Juan Jimenez, Wayne Keane, Richard Massie, Victoria Pamias, Richard Provost, Maricruz Saunders, GloryAnn Torres, Pedro Torres, Joan Walker, Catherine Whan. PHOTOGRAPHERS: John Carrero, Young Baek Choi, Randy Fader-Smith, Milton Ferreira, Roger Ince, Juan Jimenez, Umoja Kwanguvu, Seymour Lerman, Clinton Linton, Richard Provost, Jaidee amsinghani, Maricruz Saunders, Frank Tocco, GloryAnn Torres, Catherine Whan, Alan Young. ARTISTS: Cover Design: Madeline Vega; Endsheets: Oscar "DJ Ozzie" Ramirez; Division Pages: Jose Marti; International LaGuardia: Jacqui Fernandez; Illustrations: Richard Massie, Jacqui Fernandez, Madeline Vega. WRITERS: Yasmin Ahmed, Vincent Banrey, Warren Gardner, Juan Jimenez, Umoja Kwanguvu, Luis Merchant, Victoria Pamias, Richard Provost, Christiana Somerville, GloryAnn Torres, Joan Walker, Catherine Whan. SIGNIFICANT OTHERS: Word Processing: Blanca Arbito, Edward Hollins, Catherine Whan. Vincent Banrey Spread: developed by Blanca Arbito, Edward Hollins and GloryAnn Torres, Jacqui Fernandez, Catherine Whan. Creative Consultant: Edward Hollins. Promotions: George Condors. SPECIAL THANKS TO: Frank and Seymour of Classic Studios; Chuck Lindsey, Photo Workshop Instructor; Ted Schiffman of Taylor Publishing Co.; Dan Horn and Thurston Reyes of LaGuardia Theatre; and the Recreation staff. ALAN BERMAN IN MEMORIAM: Sketch, Tom Fink; Alan Speaking, Brian Gallagher; Remembering Dr. Alan Berman, Tuzyline Allan.