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The green world hypothesis proposes that predators are the primary regulators of ecosystems: they are the reason the world is 'green', by regulating the herbivores that would otherwise consume all the greenery. [1] [2] It is also known as the HSS hypothesis, after Hairston, Smith and Slobodkin, the authors of the seminal paper on the subject. [3]
An ecosystem engineer is any species that creates, significantly modifies, maintains or destroys a habitat. These organisms can have a large impact on species richness and landscape-level heterogeneity of an area. [1] As a result, ecosystem engineers are important for maintaining the health and stability of the environment they are living in.
William Hemsley Emory (September 7, 1811 – December 1, 1887) was a prominent American surveyor and civil engineer of the 19th century. As an officer in the U.S. Army Corps of Topographical Engineers he specialized in mapping the United States border, including the Texas–Mexico border, and the Gadsden Purchase border, 1844–1855, and published lasting scientific reports on the border region.
An example of the 7(a)(1) process is the Army Corps of Engineers' management of the Lower Mississippi River. Since the early 2000s, a division of the U.S. Army Corps of Engineers has worked with FWS and the states to resolve endangered species and ecosystem management issues.
Water resources controlled by the Corps of Engineers are used for navigation, hydroelectric power generation, and recreation as well as water supply. The Corps first got involved in water supply in the 1850s, when they built the Washington DC aqueduct. Today USACE reservoirs supply water to nearly 10 million people in 115 cities.
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The Texas man who police suspect of killing at least 10 people celebrating New Year’s in New Orleans and injuring dozens more is an Army veteran who has worked in real estate and IT and said in ...
Huffaker’s experimental universes showed that while under many circumstances predator–prey interactions will lead to extinction of both populations, interactions of spatial heterogeneity, dispersal ability of predator and prey species, and distribution of food sources can create an environment in which predator and prey species can coexist.