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Arabidopsis thaliana, the thale cress, mouse-ear cress or arabidopsis, is a small plant from the mustard family (Brassicaceae), native to Eurasia and Africa. Commonly found along the shoulders of roads and in disturbed land, it is generally considered a weed.
In biology, a spore is a unit of sexual or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions. Spores form part of the life cycles of many plants, algae, fungi and protozoa.
Aerobiology is a branch of biology that studies the passive transport of organic particles, such as bacteria, fungal spores, very small insects, pollen grains and viruses. Aerobiologists have traditionally been involved in the measurement and reporting of airborne pollen and fungal spores as a service to those with allergies. However, aerobiology is a varied field, relating to environmental science, plant science, meteorology, phenology, and climate change.
Hygroscopy is the phenomenon of attracting and holding water molecules via either absorption or adsorption from the surrounding environment, which is usually at normal or room temperature. If water molecules become suspended among the substance's molecules, adsorbing substances can become physically changed, e.g. changing in volume, boiling point, viscosity or some other physical characteristic or property of the substance. For example, a finely dispersed hygroscopic powder, such as a salt, may become clumpy over time due to collection of moisture from the surrounding environment.
Gnetophyta is a division of plants, grouped within the gymnosperms, that consists of some 70 species across the three relict genera: Gnetum, Welwitschia, and Ephedra. The earliest unambiguous records of the group date to the Jurassic, and they achieved their highest diversity during the Early Cretaceous. The primary difference between gnetophytes and other gymnosperms is the presence of vessel elements, a system of small tubes (xylem) that transport water within the plant, similar to those found in flowering plants. Because of this, gnetophytes were once thought to be the closest gymnosperm relatives to flowering plants, but more recent molecular studies have brought this hypothesis into question, with many recent phylogenies finding them to be nested within the conifers.
The Pinaceae, or pine family, are conifer trees or shrubs, including many of the well-known conifers of commercial importance such as cedars, firs, hemlocks, piñons, larches, pines and spruces. The family is included in the order Pinales, formerly known as Coniferales. Pinaceae are supported as monophyletic by their protein-type sieve cell plastids, pattern of proembryogeny, and lack of bioflavonoids. They are the largest extant conifer family in species diversity, with between 220 and 250 species in 11 genera, and the second-largest in geographical range, found in most of the Northern Hemisphere, with the majority of the species in temperate climates, but ranging from subarctic to tropical. The family often forms the dominant component of boreal, coastal, and montane forests. One species, Pinus merkusii, grows just south of the equator in Southeast Asia. Major centres of diversity are found in the mountains of southwest China, Mexico, central Japan, and California.
A frugivore is an animal that thrives mostly on raw fruits or succulent fruit-like produce of plants such as roots, shoots, nuts and seeds. Approximately 20% of mammalian herbivores eat fruit. Frugivores are highly dependent on the abundance and nutritional composition of fruits. Frugivores can benefit or hinder fruit-producing plants by either dispersing or destroying their seeds through digestion. When both the fruit-producing plant and the frugivore benefit by fruit-eating behavior the interaction is a form of mutualism.
Biological dispersal refers to both the movement of individuals from their birth site to their breeding site, as well as the movement from one breeding site to another . Dispersal is also used to describe the movement of propagules such as seeds and spores. Technically, dispersal is defined as any movement that has the potential to lead to gene flow. The act of dispersal involves three phases: departure, transfer, settlement and there are different fitness costs and benefits associated with each of these phases. Through simply moving from one habitat patch to another, the dispersal of an individual has consequences not only for individual fitness, but also for population dynamics, population genetics, and species distribution. Understanding dispersal and the consequences both for evolutionary strategies at a species level, and for processes at an ecosystem level, requires understanding on the type of dispersal, the dispersal range of a given species, and the dispersal mechanisms involved. Biological dispersal can be correlated to population density. The range of variations of a species' location determines expansion range.
Dioecy is a characteristic of certain species that have distinct unisexual individuals, each producing either male or female gametes, either directly or indirectly. Dioecious reproduction is biparental reproduction. Dioecy has costs, since only the female part of the population directly produces offspring. It is one method for excluding self-fertilization and promoting allogamy (outcrossing), and thus tends to reduce the expression of recessive deleterious mutations present in a population. Plants have several other methods of preventing self-fertilization including, for example, dichogamy, herkogamy, and self-incompatibility.
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Defaunation is the global, local, or functional extinction of animal populations or species from ecological communities. The growth of the human population, combined with advances in harvesting technologies, has led to more intense and efficient exploitation of the environment. This has resulted in the depletion of large vertebrates from ecological communities, creating what has been termed "empty forest". Defaunation differs from extinction; it includes both the disappearance of species and declines in abundance. Defaunation effects were first implied at the Symposium of Plant-Animal Interactions at the University of Campinas, Brazil in 1988 in the context of Neotropical forests. Since then, the term has gained broader usage in conservation biology as a global phenomenon.
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The Janzen–Connell hypothesis is a well-known hypothesis for the maintenance of high species biodiversity in the tropics. It was published independently in the early 1970s by Daniel Janzen, who focused on tropical trees, and Joseph Connell who discussed trees and marine invertebrates. According to their hypothesis, host-specific herbivores, pathogens, or other natural enemies make the areas near a parent tree inhospitable for the survival of seeds or seedlings. These natural enemies are referred to as 'distance-responsive predators' if they kill seeds or seedlings near the parent tree, or 'density-dependent predators' if they kill seeds or seedlings where they are most abundant. Such predators can prevent any one species from dominating the landscape, because if that species is too common, there will be few safe places for its seedlings to survive. Both Janzen and Connell originally proposed that for natural enemies to increase local diversity, they must be host-specific and relatively immobile, such that they disproportionately reduce the density of the more locally common tree species. This prevents any one species from becoming dominant and excluding other species through competition, allowing more species to coexist in small areas. This can be classified as a stabilizing mechanism.
Nilanjana Dasgupta is a social psychologist whose work focuses on the effects of social contexts on implicit stereotypes - particularly on factors that insulate women in STEM fields from harmful stereotypes which suggest that females perform poorly in such areas. Dasgupta is a professor of Psychology and is the Director of the Institute of Diversity Sciences and the University of Massachusetts, Amherst.
Ran Nathan is an Israeli biologist, ornithologist, and academic.
Pedro Diego Jordano Barbudo is an ecologist, conservationist, researcher, focused on evolutionary ecology and ecological interactions. He is an honorary professor and associate professor at University of Sevilla, Spain. Most of his fieldwork is done in Parque Natural de las Sierras de Cazorla, Segura y Las Villas, in the eastern side of Andalucia, and in Doñana National Park, where he holds the title of Research Professor for the Estación Biológica Doñana, Spanish Council for Scientific Research (CSIC). Since 2000 he has been actively doing research in Brazil, with fieldwork in the SE Atlantic rainforest.
Joshua B. Plotkin is an evolutionary biologist and applied mathematician. He is the Walter H. and Leonore C. Annenberg Professor of Natural Sciences at the University of Pennsylvania. Plotkin's research includes the study of the evolution of adaptation in populations, virus ecology, genetic drift, protein translation, and social norms.
Alice Cheung is an American biochemist who is a professor of molecular biology at the University of Massachusetts Amherst. Her research considers the molecular and cellular biology of polarization. She was elected a Fellow of the American Association for the Advancement of Science in 2020.
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References
- ↑ "UMass Amherst: Biology Department: Faculty: Tristram G. Seidler". www.bio.umass.edu. UMass Amherst. 16 October 2013.
- ↑ Raver, Anne (2008-04-24). "Humming Praises For the Wild Bee". The New York Times.
- ↑ Daru, Barnabas H.; Park, Daniel S.; Primack, Richard B.; Willis, Charles G.; Barrington, David S.; Whitfeld, Timothy J. S.; Seidler, Tristram G.; Sweeney, Patrick W.; Foster, David R.; Ellison, Aaron M.; Davis, Charles C. (January 2018). "Widespread sampling biases in herbaria revealed from large-scale digitization". New Phytologist. 217 (2): 939–955. doi: 10.1111/nph.14855 . PMID 29083043.
- ↑ Reuell, Peter (2017-12-27). "Study illuminates botanical bias". Phys.org. Retrieved 2018-10-10.
- ↑ Seidler, Tristram G; Plotkin, Joshua B; Nathan, Ran (17 October 2006). "Seed Dispersal and Spatial Pattern in Tropical Trees". PLOS Biology. 4 (11): e344. doi: 10.1371/journal.pbio.0040344 . PMC 1609130 . PMID 17048988.
- ↑ "Rainforest tree placement is studied". UPI Newstrack. 2006-11-26.
- ↑ Seidler, Tristram; Brumback, William. "New Facilities for Housing and Curation of Seed Bank of Rare and Endangered Plants of the Northeastern United States". Grantome.com. Grantome.
- ↑ Normanly, Jennifer; Ma, Li-Jun; Seidler, Tristram. "CSBR: Living Stock Collections: A "Biological Gold Mine" of plant natural products and pathways for biochemical and evolutionary studies". Grantome.com. Grantome.
- ↑ Lathrop, Janet (2016-12-14). "UMass Amherst and Boston-based PCL, Inc. Offer New Tool for Biotech Research". Office of News & Media Relations UMass Amherst. Retrieved 2018-10-10.
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