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(4 classifications) (52 resources)

Ecological Core Concept Classifications
Density and distribution (33) Genetic and phenotypic diversity (15) Life history traits and reproduction (16)	Population growth and regulation (44)

Resources

		A Bearded Vulture (Gypaetus barbatus), a threatened species. The Bearded Vulture (Gypaetus barbatus) is a threatened species. Many conservation programs aim to increase population size by improving survival and reproduction; however, density dependence may...	You must be logged in to access all resource information.	More Info

		*A female rotifer (Brachionus calyciflorus) with two eggs* A female rotifer (Brachionus calyciflorus) with two eggs. The eggs are the result of parthenogenesis, or asexual reproduction by the female, which occurs in rotifers when growing conditions are...	You must be logged in to access all resource information.	More Info

		A female silver studded blue butterfly (Plebejus argus) on a shrub in the Donana National Park of southern Spain. A female silver studded blue butterfly (Plebejus argus) on a shrub in the Donana National Park of southern Spain. P. argus has a mutualistic association with ants of the genus Lasius and uses the...	You must be logged in to access all resource information.	More Info

		A Galapagos sea lion (Zalophus wollebaeki) nurses a pup. In mammals, lactation has important effects on maternal and offspring fitness. Pinnipeds (fin-footed mammals) are a good mammalian group for research studies that focus on lactation because in...	You must be logged in to access all resource information.	More Info

		A Generally Accessible Derivation of the Golden Rule of Bioeconomics This article provides formulas to understand the bioeconomics of world fishery harvesting.		More Info

		A group of bluehead wrasse (Thalassoma bifasciatum) shoal above a reef at St. Croix, U.S. Virgin Islands. A group of bluehead wrasse (Thalassoma bifasciatum) shoal (group together) above a reef at St. Croix, U.S. Virgin Islands. Shoaling is a common anti-predator behavior for reef fishes such as the...	You must be logged in to access all resource information.	More Info

		A herd of alpine ibex (Capra ibex) struggling to move through deep snow. A herd of alpine ibex (Capra ibex) struggles through deep snow. A recent study examined 45 years of census data for a population of alpine ibex in Gran Paradiso National Park in northwestern Italy....	You must be logged in to access all resource information.	More Info

		A juvenile Marbled Murrelet (Brachyramphus marmoratus) sits on its nest platform high in an old-growth Douglas fir. A juvenile Marbled Murrelet (Brachyramphus marmoratus) sits on its nest platform high in an old-growth Douglas fir. The Marbled Murrelet is an endangered seabird. A recent study used age-ratio...	You must be logged in to access all resource information.	More Info

		A periodical cicada (Magicicada sp.) molts on the side of a tree after emerging from underground. A periodical cicada (left) has mostly freed itself from its old exoskeleton (right). The cicada's new exoskeleton is light in color and has not yet hardened. Every 13 or 17 years, periodical cicadas...	You must be logged in to access all resource information.	More Info

		A Simple Equation for Presenting Reproductive Value to Introductory Biology and Ecology Classes This article provides a reproductive value equation, along with a hypothetical life table, for teachers of introductory biology and ecology classes		More Info

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