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Guadalupe Petrel
The Guadalupe storm petrel (''Hydrobates macrodactylus'') is a small seabird of the storm petrel family Hydrobatidae. It has been assessed as Critically Endangered or possibly extinct. Taxonomy It was formerly defined in the genus ''Oceanodroma'' before that genus was synonymized with '' Hydrobates''. Description and ecology This species was almost indistinguishable from its relative, Leach's storm petrel. In the field, they could not be told apart except by their annual rhythm. In the hand, the Guadalupe storm petrel could be distinguished by slightly larger size and the paler underwing coverts. There is no evidence for sexual dimorphism in this species. It bred only on Guadalupe Island off Baja California, Mexico, and presumably ranged throughout the region. The breeding season was set between the two other breeding storm petrel species of Guadalupe, the winter-breeding Ainley's and the summer-breeding Townsend's, in accordance with Gause's law. The single egg, white wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Walter E
Walter may refer to: People * Walter (name), both a surname and a given name * Little Walter, American blues harmonica player Marion Walter Jacobs (1930–1968) * Gunther (wrestler), Austrian professional wrestler and trainer Walter Hahn (born 1987), who previously wrestled as "Walter" * Walter, standard author abbreviation for Thomas Walter (botanist) ( – 1789) Companies * American Chocolate, later called Walter, an American automobile manufactured from 1902 to 1906 * Walter Energy, a metallurgical coal producer for the global steel industry * Walter Aircraft Engines, Czech manufacturer of aero-engines Films and television * ''Walter'' (1982 film), a British television drama film * Walter Vetrivel, a 1993 Tamil crime drama film * ''Walter'' (2014 film), a British television crime drama * ''Walter'' (2015 film), an American comedy-drama film * ''Walter'' (2020 film), an Indian crime drama film * ''W*A*L*T*E*R'', a 1984 pilot for a spin-off of the TV series ''M*A*S*H'' * ''W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lavender (color)
Lavender is a light shade of purple or violet. It applies particularly to the color of the flower of the same name. The web color called lavender is displayed at right—it matches the color of the very palest part of the lavender flower; however, the more saturated color shown below as '' floral lavender'' more closely matches the average color of the lavender flower as shown in the picture and is the tone of lavender historically and traditionally considered ''lavender'' by the average person as opposed to those who are website designers. The color lavender might be described as a ''medium purple'' or a ''light pinkish-purple''. The term ''lavender'' may be used in general to apply to a wide range of pale, light or grayish-purples but only on the blue side. Lilac is pale purple on the pink side. In paints, the color lavender is made by mixing purple and white paint. The first recorded use of the word ''lavender'' as a color term in English was in 1705. Historical developme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sympatric
In biology, two related species or populations are considered sympatric when they exist in the same geographic area and thus frequently encounter one another. An initially interbreeding population that splits into two or more distinct species sharing a common range exemplifies sympatric speciation. Such speciation may be a product of reproductive isolation – which prevents hybrid offspring from being viable or able to reproduce, thereby reducing gene flow – that results in genetic divergence. Sympatric speciation may, but need not, arise through secondary contact, which refers to speciation or divergence in allopatry followed by range expansions leading to an area of sympatry. Sympatric species or taxa in secondary contact may or may not interbreed. Types of populations Four main types of population pairs exist in nature. Sympatric populations (or species) contrast with parapatric populations, which contact one another in adjacent but not shared ranges and do no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coextinction
Coextinction and cothreatened refer to the phenomena of the loss or decline of a host species resulting in the loss or endangerment of an other species that depends on it, potentially leading to cascading effects across trophic levels. The term originated by the authors Stork and Lyal (1993) and was originally used to explain the extinction of parasitic insects following the loss of their specific hosts. The term is now used to describe the loss of any interacting species, including competition with their counterpart, and specialist herbivores with their food source. Coextinction is especially common when a keystone species goes extinct. Causes The most frequently cited example is that of the extinct passenger pigeon and its parasitic bird lice ''Columbicola extinctus'' and ''Campanulotes defectus''. Recently, ''C. extinctus'' was rediscovered on the band-tailed pigeon, and ''C. defectus'' was found to be a likely case of misidentification of the existing '' Campanulotes flavus''. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ashy Storm Petrel
The ashy storm petrel (''Hydrobates homochroa'') is a small, scarce seabird of the storm petrel family Hydrobatidae. It breeds seabird colony, colonially on islands off the coasts of California and Mexico, and is one of six species of storm petrel that live and feed in the rich California Current system. Taxonomy The ashy storm petrel was first described by American ornithologist Elliott Coues in 1864. Both its common and scientific name, ''homochroa'', "uniformly colored", from Ancient Greek (h)omoia (''όμοια''), "alike" + "chroma" (''χρώμα'') "color", come from its coloration. It was formerly defined in the genus ''Oceanodroma'' before that genus was synonymized with ''Northern storm petrel, Hydrobates''. Description and ecology This is a small, uniformly sooty-brown storm petrel with a forked tail, closely resembling the black storm petrel, but it is smaller and has a more fluttering style of flight, with the upstroke only becoming horizontal to the body before beg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ischnocera
The Ischnocera is a large superfamily of lice. They are mostly parasitic on birds, but including a large family (the Trichodectidae) parasitic on mammals. The genus '' Trichophilopterus'' is also found on mammals (lemurs), but probably belongs to the "avian Ischnocera" and represents a host switch from birds to mammals. It is a chewing louse, which feeds on the feathers and skin debris of birds. Many of the avian Ischnocera have evolved an elongated body shape. This allows them to conceal themselves between the feather shafts and avoid being dislodged during preening or flight. The taxonomy of the group is in need of revision, as several phylogenetic studies have found the group to be paraphyletic, specifically in regards to the two major families Philopteridae and Trichodectidae. In order to resolve this, in 2020 de Moya ''et al.'' proposed retaining the majority of the species (including Philopteridae) within Ischnocera, and then moving Trichodectidae to its own grouping cal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Menoponidae
Menoponidae is a monophyletic family of lice in the superfamily of chewing lice, Amblycera, often referred to as the chicken body louse family. They are ectoparasites of a wide range of birds including chickens, which makes them important to understand for veterinary science and for human health. However, Menoponidae are not exclusive to poultry and are common parasites for migratory birds, with more and more species being discovered every year. Biology Genera and species within the family Menoponidae are identified by their short antennae, concealed in grooves behind the eyes. To the untrained eye, it may appear as though they have no antennae. Most lice also further specialize to specific regions on their hosts such as the fluff at the base of the tail, the head, and the shaft. In fact, if a species that is better suited to tail feathers is presented with the opportunity to infest a different type of feather, they will make an attempt to eat those feathers but will fail to rep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasite
Parasitism is a close relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. The entomologist E. O. Wilson has characterised parasites as "predators that eat prey in units of less than one". Parasites include single-celled protozoans such as the agents of malaria, sleeping sickness, and amoebic dysentery; animals such as hookworms, lice, mosquitoes, and vampire bats; fungi such as Armillaria mellea, honey fungus and the agents of ringworm; and plants such as mistletoe, dodder, and the Orobanchaceae, broomrapes. There are six major parasitic Behavioral ecology#Evolutionarily stable strategy, strategies of exploitation of animal hosts, namely parasitic castration, directly transmitted parasitism (by contact), wikt:trophic, trophicallytransmitted parasitism (by being eaten), Disease vector, vector-transmitted parasitism, parasitoidism, and micropreda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lice
Louse ( : lice) is the common name for any member of the clade Phthiraptera, which contains nearly 5,000 species of wingless parasitic insects. Phthiraptera has variously been recognized as an order, infraorder, or a parvorder, as a result of developments in phylogenetic research. Lice are obligate parasites, living externally on warm-blooded hosts which include every species of bird and mammal, except for monotremes, pangolins, and bats. Lice are vectors of diseases such as typhus. Chewing lice live among the hairs or feathers of their host and feed on skin and debris, while sucking lice pierce the host's skin and feed on blood and other secretions. They usually spend their whole life on a single host, cementing their eggs, called nits, to hairs or feathers. The eggs hatch into nymphs, which moult three times before becoming fully grown, a process that takes about four weeks. Genetic evidence indicates that lice are a highly modified lineage of Psocoptera (now called Ps ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fledging
Fledging is the stage in a flying animal's life between hatching or birth and becoming capable of flight. This term is most frequently applied to birds, but is also used for bats. For altricial birds, those that spend more time in vulnerable condition in the nest, the nestling and fledging stage can be the same. For precocial birds, those that develop and leave the nest quickly, a short nestling stage precedes a longer fledging stage. All birds are considered to have fledged when the feathers and wing muscles are sufficiently developed for flight. A young bird that has recently fledged but is still dependent upon parental care and feeding is called a fledgling. People often want to help fledglings, as they appear vulnerable, but it is best to leave them alone. The USA National Phenology Network defines the phenophase (or life cycle stage) of fledged young for birds as "One or more young are seen recently departed from the nest. This includes young incapable of sustained fli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Avian Incubation
Egg incubation is the process by which an egg, of oviparous (egg-laying) animals, develops an embryo within the egg, after the egg's formation and ovipositional release. Egg incubation is done under favorable environmental conditions, possibly by brooding and hatching the egg. Multiple and various factors are vital to the incubation of various species of animal. In many species of reptile for example, no fixed temperature is necessary, but the actual temperature determines the sex ratio of the offspring. In birds in contrast, the sex of offspring is genetically determined, but in many species a constant and particular temperature is necessary for successful incubation. Especially in poultry, the act of sitting on eggs to incubate them is called brooding. The action or behavioral tendency to sit on a clutch of eggs is also called broodiness, and most egg-laying breeds of poultry have had this behavior selectively bred out of them to increase production. Avian incubation A wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cloud Forest
A cloud forest, also called a water forest, primas forest, or tropical montane cloud forest (TMCF), is a generally tropical or subtropical, evergreen, montane, moist forest characterized by a persistent, frequent or seasonal low-level cloud cover, usually at the canopy level, formally described in the ''International Cloud Atlas'' (2017) as silvagenitus. Cloud forests often exhibit an abundance of mosses covering the ground and vegetation, in which case they are also referred to as mossy forests. Mossy forests usually develop on the saddles of mountains, where moisture introduced by settling clouds is more effectively retained. Cloud forests are among the most biodiversity rich ecosystems in the world with a large amount of species directly or indirectly depending on them. Other moss forests include black spruce/feathermoss climax forest, with a moderately dense canopy and a forest floor of feathermosses including ''Hylocomium splendens'', ''Pleurozium schreberi'' and ''Ptil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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