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Trivers
Robert Ludlow "Bob" Trivers (; born February 19, 1943) is an American evolutionary biologist and sociobiologist. Trivers proposed the theories of reciprocal altruism (1971), parental investment (1972), facultative sex ratio determination (1973), and parent–offspring conflict (1974). He has also contributed by explaining self-deception as an adaptive evolutionary strategy (first described in 1976) and discussing intragenomic conflict. Education Trivers studied evolutionary theory with Ernst Mayr and William Drury at Harvard from 1968 to 1972, when he earned his PhD in biology. At Harvard he published a series of some of the most influential and highly cited papers in evolutionary biology. His first major paper as a graduate student was "The evolution of reciprocal altruism", published in 1971. In this paper Trivers offers a solution to the longstanding problem of cooperation among unrelated individuals and by doing so overcame a crucial problem for how to police the system by p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parental Investment
Parental investment, in evolutionary biology and evolutionary psychology, is any parental expenditure (e.g. time, energy, resources) that benefits offspring.Clutton-Brock, T.H. 1991. ''The Evolution of Parental Care''. Princeton, NJ: Princeton U. Press. pg. 9Trivers, R.L. (1972). Parental investment and sexual selection. In B. Campbell (Ed.), ''Sexual selection and the descent of man'', 1871-1971 (pp. 136–179). Chicago, IL: Aldine. . Parental investment may be performed by both males and females (called ''biparental care''), females alone (''exclusive maternal care'') or males alone (''exclusive paternal care''). Care can be provided at any stage of the offspring's life, from pre-natal (e.g. egg guarding and Egg incubation, incubation in birds, and placental nourishment in mammals) to post-natal (e.g. food provisioning and protection of offspring). Parental investment theory, a term coined by Robert Trivers in 1972, predicts that the sex that invests more in its offsprin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reciprocal Altruism
In evolutionary biology, reciprocal altruism is a behaviour whereby an organism acts in a manner that temporarily reduces its fitness while increasing another organism's fitness, with the expectation that the other organism will act in a similar manner at a later time. The concept was initially developed by Robert Trivers to explain the evolution of cooperation as instances of mutually altruistic acts. The concept is close to the strategy of " tit for tat" used in game theory. In 1987, Trivers presented at a symposium on reciprocity, noting that he initially titled his article "The Evolution of Delayed Return Altruism," but reviewer W. D. Hamilton suggested renaming it "The Evolution of Reciprocal Altruism." While Trivers adopted the new title, he retained the original examples, causing confusion about reciprocal altruism for decades. Rothstein and Pierotti (1988) addressed this issue at the symposium, proposing new definitions that clarified the concepts. They argued that Delayed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Self-deception
Self-deception or self-delusion is a process of denying or rationalizing away the relevance, significance, or importance of opposing evidence and logical argument. Self-deception involves convincing oneself of a truth (or lack of truth) so that one does not reveal any self-knowledge of the deception. Brief history While Freudian analysis of the conscious and the unconscious minds dominated the field, psychological scientists in the 1970s became curious about how those two seemingly separate worlds could work together. The lack of mechanistic models available to this line of research, led to the debate being unresolved. Later, the focus has been shifted to vision-related research in social psychology. Theorization Analysis The traditional paradigm of self-deception is modeled after ''interpersonal'' deception, where ''A'' intentionally gets ''B'' to believe some proposition ''p'', all the while knowing or believing truly ¬''p'' (not ''p''). Such deception is intentional a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parent–offspring Conflict
Parent–offspring conflict (POC) is an expression coined in 1974 by Robert Trivers. It is used to describe the evolutionary conflict arising from differences in optimal parental investment (PI) in an offspring from the standpoint of the parent and the offspring. PI is any investment by the parent in an individual offspring that decreases the parent's ability to invest in other offspring, while the selected offspring's chance of surviving increases. POC occurs in sexually reproducing species and is based on a genetic conflict: Parents are equally related to each of their offspring and are therefore expected to equalize their investment among them. Offspring are only half or less related to their siblings (and fully related to themselves), so they try to get more PI than the parents intended to provide even at their siblings' disadvantage. However, POC is limited by the close genetic relationship between parent and offspring: If an offspring obtains additional PI at the expense of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intragenomic Conflict
Intragenomic conflict refers to the evolutionary phenomenon where genes have phenotypic effects that promote their own transmission in detriment of the transmission of other genes that reside in the same genome. The selfish gene theory postulates that natural selection will increase the frequency of those genes whose phenotypic effects cause their transmission to new organisms, and most genes achieve this by cooperating with other genes in the same genome to build an organism capable of reproducing and/or helping kin to reproduce. The assumption of the prevalence of intragenomic cooperation underlies the organism-centered concept of inclusive fitness. However, conflict among genes in the same genome may arise both in events related to reproduction (a selfish gene may "cheat" and increase its own presence in gametes or offspring above the expected according to fair Mendelian segregation and fair gametogenesis) and altruism (genes in the same genome may disagree on how to value ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sex Ratio
A sex ratio is the ratio of males to females in a population. As explained by Fisher's principle, for evolutionary reasons this is typically about 1:1 in species which reproduce sexually. However, many species deviate from an even sex ratio, either periodically or permanently. These include parthenogenic and androgenetic species, periodically mating organisms such as aphids, some eusocial wasps, bees, ants, and termites. Types In most species, the sex ratio varies according to the age profile of the population. It is generally divided into four subdivisions: * — ratio at fertilization * — ratio at birth * — ratio in sexually mature organisms ** The tertiary sex ratio is equivalent to the (ASR), which is defined as the ratio of adult males to females in a population. ** The operational sex ratio (OSR) is the ratio of ''sexually active'' males to females in a population, and is therefore derived from a subset of the individuals included when calculating the ASR. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Air Florida Flight 90
Air Florida Flight 90 was a scheduled domestic passenger flight operated from Washington National Airport (now Ronald Reagan Washington National Airport) to Fort Lauderdale–Hollywood International Airport, with an intermediate stopover at Tampa International Airport. On January 13, 1982, the Boeing 737-200 that executed the flight, registered as N62AF, crashed into the 14th Street Bridge over the Potomac River just after takeoff from Washington National Airport. Striking the bridge, which carries Interstate 395 between Washington, D.C., and Arlington County, Virginia, it hit seven occupied vehicles and destroyed of guard rail before plunging through the ice into the Potomac River. The aircraft was carrying 74 passengers and five crew members. Only four passengers and one crew member (flight attendant Kelly Duncan) were rescued from the crash and survived. Another passenger, Arland D. Williams Jr., assisted in the rescue of the survivors, but drowned before he could be r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ernest Edward Williams
Ernest Edward Williams (January 7, 1914 – September 1, 1998) was an American herpetologist. He coined the term '' ecomorph'' based on his research on anoles. Taxa named in honor of Ernest E. Williams The following species are named in honor of Ernest E. Williams. Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). ''The Eponym Dictionary of Reptiles''. Baltimore: Johns Hopkins University Press. xiii + 296 pp. . ("Eew", p. 81; "Ernest", p. 85; "Williams, E.E.", p. 286; "Williams-Mittermeier", p. 287). *'' Lygodactylus williamsi'' *''Anolis eewi'' (synonym of '' Anolis planiceps'') *''Erythrolamprus williamsi ''Erythrolamprus williamsi'', Williams's ground snake, is a species of snake in the Family (biology), family Colubridae. The species is found in Venezuela. References {{Taxonbar, from=Q3242059 Erythrolamprus Reptiles of Venezuela Endemic ...'' *'' Strophurus williamsi'' *'' Pelusios williamsi'' *'' Dipsas williamsi'' *'' Anolis ernestwilliamsi'' *'' Phryn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crafoord Prize
The Crafoord Prize () is an annual science prize established in 1980 by Holger Crafoord, a Swedish industrialist, and his wife Anna-Greta Crafoord following a donation to the Royal Swedish Academy of Sciences. It is awarded jointly by the Academy and the Crafoord Foundation in Lund, with the former selecting the laureates. The Prize is awarded in four categories: mathematics and astronomy, Geology, geosciences, Biology, biosciences (with an emphasis on ecology) and polyarthritis, the final one because Holger suffered from severe rheumatoid arthritis in his later years. The disciplines for which the Crafoord Prize is awarded are chosen so as to complement the Nobel Prizes. Only one award is given each year, according to a rotating scheme – astronomy and mathematics, then geosciences, then biosciences. Since 2012, the prizes in astronomy and mathematics are separate and awarded at the same time; prior to this, the disciplines alternated every cycle. A Crafoord Prize in polyarth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sociobiologist
Sociobiology is a field of biology that aims to explain social behavior in terms of evolution. It draws from disciplines including psychology, ethology, anthropology, evolution, zoology, archaeology, and population genetics. Within the study of human societies, sociobiology is closely allied to evolutionary anthropology, human behavioral ecology, evolutionary psychology, and sociology. Sociobiology investigates social behaviors such as mating patterns, territorial fights, pack hunting, and the hive society of social insects. It argues that just as selection pressure led to animals evolving useful ways of interacting with the natural environment, so also it led to the genetic evolution of advantageous social behavior. While the term "sociobiology" originated at least as early as the 1940s; the concept did not gain major recognition until the publication of E. O. Wilson's book '' Sociobiology: The New Synthesis'' in 1975. The field quickly became the subject of scientific co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of California, Santa Cruz
The University of California, Santa Cruz (UC Santa Cruz or UCSC) is a public university, public Land-grant university, land-grant research university in Santa Cruz, California, United States. It is one of the ten campuses in the University of California system. Located in Monterey Bay, on the edge of the coastal community of Santa Cruz, the main campus lies on of rolling, forested hills overlooking the Pacific Ocean. As of Fall 2024, its ten residential colleges enroll some 17,940 undergraduate and 1,998 graduate students. Satellite facilities in other Santa Cruz locations include the Coastal Science Campus and the Westside Research Park and the Silicon Valley Center in Santa Clara, California, Santa Clara, along with administrative control of the Lick Observatory near San Jose, California, San Jose in the Diablo Range and the W. M. Keck Observatory, Keck Observatory near the summit of Mauna Kea in Hawaii. Founded in 1965, UC Santa Cruz uses a residential college system consist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berlin Institute For Advanced Study
The Institute for Advanced Study in Berlin () is an interdisciplinary institute founded in 1981 in Grunewald, Berlin, Germany, dedicated to research projects in the natural and social sciences. It is modeled after the original IAS in Princeton, New Jersey and is a member of Some Institutes for Advanced Study. The purpose of the institute is to offer scholars and scientists the opportunity to concentrate on projects of their own choosing for one academic year, free from administrative duties. The institute embraces a balance of both distinguished senior scholars and promising younger researchers, drawn from a wide range of cultural backgrounds. The institute has been headed by historian Barbara Stollberg-Rilinger as rector since September 2018. Principles of the institute Fellows at the Wissenschaftskolleg are chosen with no restrictions on country of origin, discipline, or academic position. With the help of an international advisory board, invitations to scholars and scien ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
