primary productivity
31Soil food web — The soil food web is the community of organisms living all or part of their lives in the soil. It describes a complex living system in the soil and how it interacts with the environment, plants, and animals. Introduction Food webs describe the… …
32savanna — /seuh van euh/, n. 1. a plain characterized by coarse grasses and scattered tree growth, esp. on the margins of the tropics where the rainfall is seasonal, as in eastern Africa. 2. grassland region with scattered trees, grading into either open… …
33Mesopredator release hypothesis — Raccoons (Procyon lotor) and skunks (Mephitis mephitis) are mesopredators, here they share cat food in a suburban backyard. The mesopredator release hypothesis is a relatively new hypothesis from 1988[1] which describes the …
34Effects of climate change on marine mammals — Climate change is a cause of increasing concern to scientists and it will have dramatic effects on marine mammals. The increase of carbon dioxide and other greenhouse gases into the atmosphere are thought to be the main cause of climate change or …
35Nutrient cycle — …
36Ecological succession — Succession after disturbance: a boreal forest one (left) and two years (right) after a wildfire. Ecological succession, is the phenomenon or process by which a community progressively transforms itself until a stable community is formed. It is a… …
37Δ¹³C — In geochemistry, paleoclimatology and paleoceanography δ13C is a measure of the ratio of stable isotopes 13C:12C, reported in parts per thousand (per mil, permil;).The definition is δ13C (in per mil) = 103 [(Rsample/Rstandard) 1] , where Rx =… …
38Sustainability — Achieving sustainability will enable the Earth to continue supporting human life as we know it. Blue Marble NASA composite images: 2001 (left), 2002 (right). See also: Sustainable development Sustainability is the capacity to endure. For humans,… …
39δ13C — Foraminifera samples. In geochemistry, paleoclimatology and paleoceanography δ13C is an isotopic signature, a measure of the ratio of stable isotopes 13C:12C, reported in parts per thousand (per mil, ‰). The definition is, in per mil …
40Biome — The planet Earth Biomes are climatically and geographically defined as similar climatic conditions on the Earth, such as communities of plants, animals, and soil organisms,[1] and are of …
