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Blue-gray Gnatcatcher population densities are highest in the South, especially in floodplains and swamps. They often raise two broods in a season, and males will leave the newly fledged young with the female as he starts construction on a new nest.
Southern California gnatcatcher still in the spotlight
The nest, built by both adults, is an open, high-walled cup made of dead grasses and plant fiber held together with spider webbing or caterpillar silk. Bits of lichens attached to the outside help to camouflage the nest.
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Construction of the first nest takes 8 to 14 days. The male alone builds the nest for a second brood constructing it with "recycled" material from the first nest. Nests are usually placed far out from the tree trunk on a horizontal branch. Nest heights in Tennessee range from 6 to 45 feet above the ground, with an average height of 21 feet. The Blue-gray Gnatcatcher is a fairly common summer resident of woodlands and woodland edges across the state. The Blue-gray Gnatcatcher is yet another member of the southern avifauna that has recently spread into Massachusetts and the northeastern United States.
Distribution in the Americas
Prior to , it was regarded only as a transient, with the bulk of the observations from late August to early September. Since , the gnatcatcher has experienced a steady increase, both as a spring and fall migrant and also as an uncommon and somewhat local summer resident in every geographical region of the state. The gnatcatcher has a distinct affinity for water margins—wooded edges along ponds, streams, and the edges of Red Maple swamps.
Nesting records are concentrated along the major river valleys and at Quabbin, where the increase in Beaver numbers and their associated wetlands provide ideal habitat.
Gnatcatcher
According to Atlas figures, it was estimated that in there were 20 to 30 pairs of gnatcatchers nesting in Quabbin. The first resident gnatcatchers arrive in mid-April, and from then until the end of the month the remaining residents filter in, although migrants may be noted until mid-May. Observers familiar with the high, thin speee call note are likely to be the first to encounter this sprite because it is constantly vocal while flitting about in the treetops.
The Introduction Article is just the first of 11 articles in each species account that provide life history information for the species. The remaining articles provide detailed information regarding distribution, migration, habitat, diet, sounds, behavior, breeding, current population status and conservation.
California gnatcatcher - Wikipedia
Written and continually updated by acknowledged experts on each species, Birds of North America accounts include a comprehensive bibliography of published research on the species. A subscription is needed to access the remaining account articles and multimedia content. Extolled by conservationists for its ability to stop a bulldozer in its tracks and reviled by land developers as their worst enemy, the tiny California Gnatcatcher has become a symbol of the challenges of how to interpret and apply the U.
Commonly found throughout most of southern and central Baja California in a variety of arid scrub habitats, the range of this small, nonmigratory songbird extends northward into coastal southern California, where it occurs on some of the most expensive private real estate in the United States. Explosive human population growth and resultant suburban sprawl within the last 50 years has reduced and fragmented the species' coastal sage scrub habitat, and led to Federal protection of the northernmost subspecies as a Threatened species in Furthermore, concerns engendered by this decision catalyzed passage of legislation by the State of California intended to protect natural communities while allowing continued economic growth.
Little is known of the California Gnatcatcher's biology in the heart of its range in Baja California. In contrast, substantial research has been conducted on its distribution and biology in the United States during the last 10 years. Much of this recent work was done in response to various management and conservation decisions, resulting in a diverse but sometimes poorly conceived research agenda pursued by environmental consultants, academics, wildlife agency personnel, and conservation advocates.