Daniel Hunt Janzen is an American evolutionary ecologist and conservationist. He divides his time between his professorship in biology at the University of Pennsylvania, where he is the DiMaura Professor of Conservation Biology, and his research and field work in Costa Rica.
Ecological restoration, or ecosystem restoration, is the process of assisting the recovery of an ecosystem that has been degraded, damaged, or destroyed. It is distinct from conservation in that it attempts to retroactively repair already damaged ecosystems rather than take preventative measures. Ecological restoration can reverse biodiversity loss, combat climate change, and support local economies. The United Nations named 2021-2030 the Decade on Ecosystem Restoration.
Forest ecology is the scientific study of the interrelated patterns, processes, flora, fauna and ecosystems in forests. The management of forests is known as forestry, silviculture, and forest management. A forest ecosystem is a natural woodland unit consisting of all plants, animals, and micro-organisms in that area functioning together with all of the non-living physical (abiotic) factors of the environment.
Stephen P. Hubbell is an American ecologist on the faculty of the University of California, Los Angeles. He is author of the unified neutral theory of biodiversity and biogeography (UNTB), which seeks to explain the diversity and relative abundance of species in ecological communities not by niche differences but by stochastic processes among ecologically equivalent species. Hubbell is also a senior staff scientist at the Smithsonian Tropical Research Institute in Balboa, Panama. He is also well known for tropical forest studies. In 1980, he and Robin B. Foster of the Field Museum in Chicago, launched the first of the 50 hectare forest dynamics studies on Barro Colorado Island in Panama. This plot became the flagship of a global network of large permanent forest dynamics plots, all following identical measurement protocols. This global network now has more than 70 plots in 28 countries, and these plots contain more than 12000 tree species and 7 million individual trees that are tagged, mapped, and monitored long-term for growth, survival and recruitment. The Center for Tropical Forest Science coordinates research across global network of plots through the Smithsonian Tropical Research Institute. The program has expanded into the temperate zone, and is now known as the Forest Global Earth Observatory Network or ForestGEO.
A nurse log is a fallen tree which, as it decays, provides ecological facilitation to seedlings. Broader definitions include providing shade or support to other plants. Some of the advantages a nurse log offers to a seedling are: water, moss thickness, leaf litter, mycorrhizae, disease protection, nutrients, and sunlight. Recent research into soil pathogens suggests that in some forest communities, pathogens hostile to a particular tree species appear to gather in the vicinity of that species, and to a degree inhibit seedling growth. Nurse logs may therefore provide some measure of protection from these pathogens, thus promoting greater seedling survivorship.
The following outline is provided as an overview of and topical guide to ecology:
Ecological dominance is the degree to which one or several species have a major influence controlling the other species in their ecological community or make up more of the biomass. Both the composition and abundance of species within an ecosystem can be affected by the dominant species present.
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.
Plant ecology is a subdiscipline of ecology that studies the distribution and abundance of plants, the effects of environmental factors upon the abundance of plants, and the interactions among plants and between plants and other organisms. Examples of these are the distribution of temperate deciduous forests in North America, the effects of drought or flooding upon plant survival, and competition among desert plants for water, or effects of herds of grazing animals upon the composition of grasslands.
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.
Joseph Hurd Connell FAA was an American ecologist. He earned his MA degree in zoology at the University of California, Berkeley and his PhD at Glasgow University. Connell's first research paper examined the effects of interspecific competition and predation on populations of a barnacle species on the rocky shores of Scotland. According to Connell, this classic paper is often cited because it addressed ecological topics that previously had been given minor roles. Together, with a subsequent barnacle study on the influence of competition and desiccation, these two influential papers have laid the foundation for future research and the findings continue to have relevance to current ecology. His early work earned him a Guggenheim fellowship in 1962 and the George Mercer Award in 1963.
Aaron M. Ellison is an American ecologist, photographer, sculptor, and writer. He retired in July 2021 after 20 years as the senior research fellow in ecology at Harvard University and as a Senior Ecologist at the Harvard Forest. He also served as deputy director of the Harvard Forest from 2018 to 2021. Until 2018, he also was an adjunct research professor at the University of Massachusetts in the Departments of Biology and Environmental Conservation. Ellison has both authored and co-authored numerous scientific papers, books, book reviews and software reviews. For more than 30 years, Ellison has studied food-web dynamics and community ecology of wetlands and forests; the evolutionary ecology of carnivorous plants; the responses of plants and ants to global climate change; application of Bayesian statistical inference to ecological research and environmental decision-making; and the critical reaction of Ecology to Modernism. In 2012 he was elected a fellow of the Ecological Society of America. He was the editor-in-chief of Ecological Monographs from 2008 to 2015, was a senior editor of Methods in Ecology and Evolution from 2018-2021, and since 2021 has been the executive editor of Methods in Ecology and Evolution.
Malwattage Celestine Violet Savitri Gunatilleke is professor emeritus at the University of Peradeniya in Sri Lanka's Central Province. She has had a long career in forest ecology and has been a leader in quantitative ecology and education. Most of her research has focused in the Sinharaja rain forest in Sri Lanka. She considers her main contribution to forest ecology to be spreading the idea that successful forest conservation depends on local conservationists. In line with this, she is proud of her students and their accomplishments in the field of conservation.
Julie Sloan Denslow is an American botanist, ecologist and biologist. She grew up in South Florida, and always loved nature. She graduated from Coral Gables Senior High School in 1960. She has contributed to the field of ecology through her work with and research of tropical ecosystems. Earlier in her career, she spent significant time in the field in tropical locations such as Costa Rica and Panama, as well as in temperate locations in Louisiana. and later on in her career she worked more in the office and classroom, but still spent the occasional day in the field. She has focused on research involving the ecology of exotic invasive plant species, and on ecosystem reactions and recovery following disturbances. Denslow is also a strong supporter of gender equality in the natural sciences, pushing for equal representation of women involved in tropical research and leadership during a 2007 Gender Committee Meeting within the Association for Tropical Biology and Conservation (ATBC). Her most notable contribution to tropical research is her paper "Gap Partitioning among Tropical Rainforest Trees", published in 1980.
Susan Patricia Harrison is a professor of ecology at the University of California, Davis who works on the dynamics of natural populations and ecological diversity. She is a fellow of the Ecological Society of America and the California Academy of Sciences. She has previously served as vice president of the American Society of Naturalists. She was elected to the National Academy of Sciences in 2018.
Jeannine Cavender-Bares is a Distinguished McKnight University Professor at the University of Minnesota in the Department of Ecology, Evolution & Behavior. Her research integrates evolutionary biology, ecology, and physiology by studying the functional traits of plants, with a particular focus on oaks.
Jane Memmott is an ecologist and entomologist from the United Kingdom. She is professor of ecology at the University of Bristol. Her research focuses on community ecology and she is an expert on the interactions between insect pollinators and plants.
María Uriarte is an ecologist who specializes in the processes that drive tropical forest dynamics, especially after extreme weather events. She is currently a professor in the Department of Ecology, Evolution, and Environmental Science at Columbia University and serves as adjunct faculty in the Department of Ecology at the University of São Paulo, Brazil. She conducts research primarily in Puerto Rico and Brazil and is associated with the Next Generation Ecosystem Experiments (NGEE) tropics and ForestGeo research groups.
Karin M. Kettenring is an American plant ecologist based in Logan, Utah. Her research focuses primarily on aspects of wetland plant ecology, including invasive plant ecology and management, native wetland seeds and seedlings, and wetland restoration. Kettenring worked in several labs and research stations across the United States before obtaining a faculty position at Utah State University as a professor of wetland ecology. Her most cited publication, “Lessons learned from invasive plant control experiments: a systematic review and meta-analysis,” looks at the literature discussing invasives species control experiments and how to ensure that research practices are most effective.
Diana F. Tomback is an American ecologist and an academic. She is a professor of Integrative Biology at the University of Colorado Denver as well as the policy and outreach coordinator at the Whitebark Pine Ecosystem Foundation, a non-profit organization.
