Paul W. Sherman (born July 6, 1949) is a professor Emeritus at Cornell University in animal behaviour best known for his work on the social behavior of rodents (ground squirrels and naked mole rats), eusociality, and evolutionary medicine. [1] [2] [3]
Sherman received his B.A. from Stanford in 1971, an M.S. in zoology from University of Michigan in 1974 and in 1976, his Ph.D. He was a Miller Postdoctoral Fellow at Berkeley from 1976 to 78, and taught there from 1978 to 1981. He joined Cornell faculty in 1981. [4] In 1984 he was awarded a Guggenheim Fellowship in 1984, [5] and in 1985 he received tenure. He was awarded full professorship at Cornell in 1991. [6] He was an Elected Fellow of the Animal Behavior Society, and served as a Sigma Xi Distinguished National Lecturer. During his career he published or edited 7 books and 195 papers and book chapters, and sponsored or co-sponsored 23 doctoral students and 7 postdoctoral students. In 2005 he was awarded the Stephen H. Weiss Presidential Fellowship for “effective, inspiring, and distinguished teaching of undergraduate students.” In 1977 he published evidence that alarm calls by female Belding's ground squirrels function to warn descendant and collateral kin of approaching terrestrial predators (coyotes, badgers, and weasels). In 1996 he published work demonstrating how kin selection in the eusocial naked mole rats affects food allocation. [7] [8] In 1999 he showed that spices have anti-microbial properties and proposed that the spices used in traditional meat-based cuisines world-wide originally (before refrigeration) served to stave off food-borne pathogens and preserve the food; as a result, people who cooked with spices and liked their tastes were best protected, especially in hot climates. In 2000 he published support for the hypothesis that morning sickness is an adaptation that protects pregnant mothers and their developing fetuses from foodborne illnesses, some of which can cause miscarriage or birth defects, such as listeriosis and toxoplasmosis. [3] [2] In 2008 he published work supporting the hypothesis that allergies function as cancer protection mechanisms. In 2010 he published evidence that bdelloid rotfiers, which present a major evolutionary puzzle because they alone have reproduced asexually for millions of years, can escape parasites and pathogens not via genetic recombination (like other organisms) but rather by completely drying up (anhydrobiosis) and dispersing on the wind.
Kin selection is a process whereby natural selection favours a trait due to its positive effects on the reproductive success of an organism's relatives, even when at a cost to the organism's own survival and reproduction. Kin selection can lead to the evolution of altruistic behaviour. It is related to inclusive fitness, which combines the number of offspring produced with the number an individual can ensure the production of by supporting others. A broader definition of kin selection includes selection acting on interactions between individuals who share a gene of interest even if the gene is not shared due to common ancestry.
Behavioral ecology, also spelled behavioural ecology, is the study of the evolutionary basis for animal behavior due to ecological pressures. Behavioral ecology emerged from ethology after Niko Tinbergen outlined four questions to address when studying animal behaviors: What are the proximate causes, ontogeny, survival value, and phylogeny of a behavior?
Group selection is a proposed mechanism of evolution in which natural selection acts at the level of the group, instead of at the level of the individual or gene.
The naked mole-rat, also known as the sand puppy, is a burrowing rodent native to the Horn of Africa and parts of Kenya, notably in Somali regions. It is closely related to the blesmols and is the only species in the genus Heterocephalus.
The Muroidea are a large superfamily of rodents, including mice, rats, voles, hamsters, lemmings, gerbils, and many other relatives. Although the Muroidea originated in Eurasia, they occupy a vast variety of habitats on every continent except Antarctica. Some authorities have placed all members of this group into a single family, Muridae, due to difficulties in determining how the subfamilies are related to one another. Many of the families within the Muroidea superfamily have more variations between the families than between the different clades. A possible explanation for the variations in rodents is because of the location of these rodents; these changes could have been due to radiation or the overall environment they migrated to or originated in. The following taxonomy is based on recent well-supported molecular phylogenies.
In evolutionary biology, inclusive fitness is one of two metrics of evolutionary success as defined by W. D. Hamilton in 1964:
Spalax is a genus of rodent in the family Spalacidae, subfamily Spalacinae. It is one of two extant genera in the subfamily Spalacinae, alongside Nannospalax.
Richard D. Alexander was an American zoologist who was a professor at the University of Michigan and curator at the university's museum of zoology of in Ann Arbor, Michigan. His scientific pursuits integrated the fields of systematics, ecology, evolution, natural history and behavior. The salient organisms in his research are wide-ranging, from the orthopterans and Cicadidae (cicadas) to vertebrates: dogs, horses, and primates, including humans.
The blesmols, also known as mole-rats, or African mole-rats, are burrowing rodents of the family Bathyergidae. They represent a distinct evolution of a subterranean life among rodents much like the pocket gophers of North America, the tuco-tucos in South America, and the Spalacidae from Eurasia.
A fossorial animal is one that is adapted to digging and which lives primarily underground. Examples of fossorial vertebrates are badgers, naked mole-rats, meerkats, armadillos, wombats, and mole salamanders. Among invertebrates, many molluscs, insects, and arachnids are fossorial.
Cheating is a term used in behavioral ecology and ethology to describe behavior whereby organisms receive a benefit at the cost of other organisms. Cheating is common in many mutualistic and altruistic relationships. A cheater is an individual who does not cooperate but can potentially gain the benefit from others cooperating. Cheaters are also those who selfishly use common resources to maximize their individual fitness at the expense of a group. Natural selection favors cheating, but there are mechanisms to regulate it. The stress gradient hypothesis states that facilitation, cooperation or mutualism should be more common in stressful environments, while cheating, competition or parasitism are common in benign environments.
Sociality is the degree to which individuals in an animal population tend to associate in social groups (gregariousness) and form cooperative societies.
The Damaraland mole-rat, Damara mole rat or Damaraland blesmol, is a burrowing rodent found in southern Africa. Along with the smaller, less hairy, naked mole rat, it is a species of eusocial mammal.
Rodents are mammals of the order Rodentia, which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents. They are native to all major land masses except for Antarctica, and several oceanic islands, though they have subsequently been introduced to most of these land masses by human activity.
Sickness behavior is a coordinated set of adaptive behavioral changes that develop in ill individuals during the course of an infection. They usually, but not always, accompany fever and aid survival. Such illness responses include lethargy, depression, anxiety, malaise, loss of appetite, sleepiness, hyperalgesia, reduction in grooming and failure to concentrate. Sickness behavior is a motivational state that reorganizes the organism's priorities to cope with infectious pathogens. It has been suggested as relevant to understanding depression, and some aspects of the suffering that occurs in cancer.
Eusociality is the highest level of organization of sociality. It is defined by the following characteristics: cooperative brood care, overlapping generations within a colony of adults, and a division of labor into reproductive and non-reproductive groups. The division of labor creates specialized behavioral groups within an animal society which are sometimes referred to as 'castes'. Eusociality is distinguished from all other social systems because individuals of at least one caste usually lose the ability to perform behaviors characteristic of individuals in another caste. Eusocial colonies can be viewed as superorganisms.
Eusociality evolved repeatedly in different orders of animals, notably termites and the Hymenoptera. This 'true sociality' in animals, in which sterile individuals work to further the reproductive success of others, is found in termites, ambrosia beetles, gall-dwelling aphids, thrips, marine sponge-dwelling shrimp, naked mole-rats, and many genera in the insect order Hymenoptera. The fact that eusociality has evolved so often in the Hymenoptera, but remains rare throughout the rest of the animal kingdom, has made its evolution a topic of debate among evolutionary biologists. Eusocial organisms at first appear to behave in stark contrast with simple interpretations of Darwinian evolution: passing on one's genes to the next generation, or fitness, is a central idea in evolutionary biology.
Rochelle Buffenstein is an American comparative biologist currently working as Research Professor at the University of Illinois Chicago. Previously, she was a senior principal investigator at Calico Life Sciences, an Alphabet, Inc. funded research and development company investigating the biology that controls aging and lifespan where she used the extraordinarily long-lived cancer resistant naked mole-rat as an attractive counter-example to the inevitability of mammalian aging; for at ages greatly exceeding the expected maximum longevity for this mouse-sized rodent, they fail to exhibit meaningful changes in age-related risk of dying or physiological decline. As such these rodents likely provide the blueprint for how to stave off myriad adverse effects of aging and provide proof of concept that age-related health decline can be avoided in humans.
In biogerontology, the disposable soma theory of aging states that organisms age due to an evolutionary trade-off between growth, reproduction, and DNA repair maintenance. Formulated by British biologist Thomas Kirkwood, the disposable soma theory explains that an organism only has a limited amount of resources that it can allocate to its various cellular processes. Therefore, a greater investment in growth and reproduction would result in reduced investment in DNA repair maintenance, leading to increased cellular damage, shortened telomeres, accumulation of mutations, compromised stem cells, and ultimately, senescence. Although many models, both animal and human, have appeared to support this theory, parts of it are still controversial. Specifically, while the evolutionary trade-off between growth and aging has been well established, the relationship between reproduction and aging is still without scientific consensus, and the cellular mechanisms largely undiscovered.
Eileen A. Lacey (1961) is an American biologist who specializes in the evolution of behavioral diversity among vertebrates. Lacey’s research focuses on identifying ecological causes of sociality and assessing the genetic consequences of sociality in subterranean rodents. She is most known for her research on the social structure of naked mole rats and her arguments regarding the eusociality continuum
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