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Accipiter nisus contamination by pesticides

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Accipiter --- Nest building --- Pinyon pines --- Junipers --- Habitat

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Accipiter --- Nest building --- Pinyon pines --- Junipers --- Habitat

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What is the minimum dimension of a niche space necessary to represent the overlaps among observed niches? This book presents a new technique for obtaining a partial answer to this elementary question about niche space. The author bases his technique on a relation between the combinatorial structure of food webs and the mathematical theory of interval graphs. Professor Cohen collects more than thirty food webs from the ecological literature and analyzes their statistical and combinatorial properties in detail. As a result, he is able to generalize: within habitats of a certain limited physical and temporal heterogeneity, the overlaps among niches, along their trophic (feeding) dimensions, can be represented in a one-dimensional niche space far more often than would be expected by chance alone and perhaps always. This compatibility has not previously been noticed. It indicates that real food webs fall in a small subset of the mathematically possible food webs. Professor Cohen discusses other apparently new features of real food webs, including the constant ratio of the number of kinds of prey to the number of kinds of predators in food webs that describe a community. In conclusion he discusses possible extensions and limitations of his results and suggests directions for future research.

Niche (Ecology) --- Food chains (Ecology) --- Accipiter. --- Conus. --- Desmognathus. --- Hawaii. --- Lake Nyasa. --- Monte Carlo simulation. --- algorithm. --- aspen forest. --- column average. --- column variance. --- composite community. --- creek. --- eating relation. --- feeding relation. --- gastropods. --- independence of niche dimensions. --- inequalities. --- intersection graph. --- marine bench. --- niche overlap graph. --- overlap. --- predator. --- pseudo-random food web. --- qualitative stability. --- resource partitioning. --- salamanders. --- sampling. --- sink food web. --- temperature. --- uniform distribution. --- variance test. --- Food chains (Ecology). --- Niche (Ecology).

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The perfect guide to the birds of the northeastern United States and eastern Canada, from the #1 birding website AllAboutBirds.orgThe All About Birds Regional Guide Series brings birding enthusiasts the best information from the renowned Cornell Lab of Ornithology’s website, AllAboutBirds.org, used by more than 24 million people each year. These definitive books provide the most up-to-date resources and expert coverage on bird species throughout North America.This dynamic pocket guide is the perfect companion for anyone interested in the birds of the northeastern United States and eastern Canada. The guide offers fascinating details about the birds around you, useful bird ID tips, and handy bird-watching information. It presents full accounts of the 198 bird species most commonly seen in these regions; beautiful photographs of male, female, and immature birds, as well as morphs, and breeding and nonbreeding plumage (so you can ID birds all year long); current range maps; and so much more. The northeastern USA and eastern Canada edition of All About Birds is easy to use and easy to share.This volume features the following states, provinces, and territories: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, Quebec, Labrador, New Brunswick, Prince Edward Island, Newfoundland, Nova Scotia, eastern Ontario, eastern Nunavut.Descriptions of 198 bird species, including four photos for each bird chosen specifically for better ID and sourced from the Macaulay Library (a collection of bird photos from citizen scientists)Quick and easy index with illustrations on cover flaps, complete index at the backInformation on Cornell Lab citizen-science programs and how to participateBonus content includes identification best practices and tips on photography, birdscaping, food and feeding, and moreFree MERLIN Bird ID app (downloaded more than 5 million times) for quick ID in the wild using photos and birdsong

Acadian flycatcher. --- Accipiter. --- Agaricus bisporus. --- American crow. --- American kestrel. --- American robin. --- Auk. --- Baltimore oriole. --- Barred owl. --- Beech. --- Belted kingfisher. --- Bird feeder. --- Bird food. --- Bird hide. --- Blue-winged teal. --- Canada goose. --- Caterpillar. --- Cattle egret. --- Common nighthawk. --- Common pheasant. --- Common raven. --- Common starling. --- Common tern. --- Cooper's hawk. --- Cornell Lab of Ornithology. --- Dawn chorus (birds). --- Diving duck. --- Eastern kingbird. --- Eastern phoebe. --- Eastern screech owl. --- Eastern towhee. --- Empidonax. --- Evening grosbeak. --- Feedlot. --- Fleet Air Arm. --- Flight feather. --- Flycatcher. --- Forster's tern. --- Gannet. --- Goose. --- Great black-backed gull. --- Great crested flycatcher. --- Grosbeak. --- Gyrfalcon. --- Harlequin duck. --- Hatching. --- Horned lark. --- Ingredient. --- Insect. --- John James Audubon. --- Lincoln's sparrow. --- Little blue heron. --- MacGillivray's warbler. --- Mallard. --- Mammal. --- Mockingbird. --- Monk parakeet. --- Mourning dove. --- Natural resource. --- Nature center. --- North America. --- Northern flicker. --- Northern mockingbird. --- Northern shoveler. --- Nuthatch. --- Ovenbird (family). --- Peregrine falcon. --- Pine warbler. --- Plover. --- Plumage. --- Purple martin. --- Razorbill. --- Red-tailed hawk. --- Red-winged blackbird. --- Savannah sparrow. --- Sharp-shinned hawk. --- Shoulder (road). --- Shrike. --- Snow goose. --- Snowy egret. --- Snowy owl. --- Song sparrow. --- Sparrow. --- Starling. --- Tent caterpillar. --- Tern. --- Towhee. --- Townsend's warbler. --- Turkey vulture. --- Tyrant flycatcher. --- Vegetation. --- Vulture. --- Warbler. --- Western tanager. --- Wetland. --- White-throated sparrow. --- Winter wren. --- Wood thrush. --- Woodpecker. --- Yellow-bellied sapsucker.