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Diapause is common in insects, allowing them to suspend development between autumn and spring, and in mammals such as the roe deer ( Capreolus capreolus, the only ungulate with embryonic diapause ), where a delay in attachment of the embryo to the uterine lining ensures that offspring are born in spring, when conditions are most favorable.
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Diapause and is
Diapause may be obligatory ( required for the insect to survive ) or facultative ( the insect is able to undergo change before the initiating event arrives ).
Diapause is the ability of the organism to produce offspring in a dormant and unhatched state.
Diapause is a predictive strategy that is predetermined by an animal's genotype.
Diapause is affected by photoperiod on the egg-laying adults or can be genetically determined.
Diapause is broken by exposure to the cold of winter, causing the eggs to hatch during the following spring.
Delayed Implantation or Embryonic Diapause is a reproductive strategy used by approximately 100 different mammals in seven or eight different orders.
The term Diapause is also used to refer to the temporary, partial, or complete metabolic suspension in various life stages of insects and plants.
Diapause is the delay in development in response to regularly and recurring periods of adverse environmental conditions.
Diapause is a mechanism used as a means to survive predictable, unfavorable environmental conditions, such as temperature extremes, drought or reduced food availability.
Diapause is most often observed in arthropods, especially insects, and in the embryos of many of the oviparous species of fish in the order Cyprinodontiformes.
Diapause is not only induced in an organism by specific stimuli or conditions, but once it is initiated, only certain other stimuli are capable of bringing the organism out of diapause.
Diapause in insects is a dynamic process consisting of several distinct phases ( Kostal 2006 ).
Diapause frequently ends prior to the end of unfavourable conditions and is followed by a state of quiescence from which the insect can arouse and begin direct development, should conditions change to become more favourable.
Diapause in insects is regulated at several levels.
Diapause in the tropics is often initiated in response to biotic rather than abiotic factors.
Diapause and insects
Diapause in the tropics poses several challenges to insects that are not faced in temperate zones.
Diapause and development
Diapause can occur during any stage of development in arthropods, but each species exhibits diapause in specific phases of development.
Diapause and such
Diapause may occur in a completely immobile stage, such as the pupae and eggs, or it may occur in very active stages that undergo extensive migrations, such as the adult Monarch butterfly, Danaus plexippus.
Diapause and embryonic
Diapause hormone regulates embryonic diapause in the eggs of the silkworm moth, Bombyx mori.
Diapause and .
( Diapause does not occur in embryos of the viviparous and ovoviviparous species of Cyprinodontiformes.
is and common
Poetry in Persian life is far more than a common ground on which -- in a society deeply fissured by antagonisms -- all may stand.
Before merging them into a common profile it is well to remember that their separate careers were extraordinary.
This almost trivial example is nevertheless suggestive, for there are some elements in common between the antique fear that the days would get shorter and shorter and our present fear of war.
Harold Clurman is right to say that `` Waiting For Godot '' is a reflection ( he calls it a distorted reflection ) `` of the impasse and disarray of Europe's present politics, ethic, and common way of life ''.
However, it is important to trace the philosophy of the French Revolution to its sources to understand the common democratic origin of individualism and socialism and the influence of the latter on the former.
But it is the need to undertake these testaments that I would submit here as symptom of the common man's malaise.
As symptomatic of the common man's malaise, he is most significant: a liberal and a Catholic, elected by the skin of his teeth.
What is the common man's complaint??
But what a super-Herculean task it is to winnow anything of value from the mud-beplastered arguments used so freely, particularly since such common use is made of cliches and stereotypes, in themselves declarations of intellectual bankruptcy.
The men who speculate on these institutions have, for the most part, come to at least one common conclusion: that many of the great enterprises and associations around which our democracy is formed are in themselves autocratic in nature, and possessed of power which can be used to frustrate the citizen who is trying to assert his individuality in the modern world ''.
They all have this in common: the earth is situated near the center of the deferent.
But that one should superimpose all these charts, run a pin through the common point, and then scale each planetary deferent larger and smaller ( to keep the epicycles from ' bumping ' ), this is contrary to any intention Ptolemy ever expresses.
Now this concern for the freedom of other peoples is the intellectual and spiritual cement which has allied us with more than forty other nations in a common defense effort.
A common meeting ground is desirable for those nations which are prepared to assist in the development effort.
Conventional images of Jews have this in common with all perceptions of a configuration in which one feature is held constant: images can be both true and false.
If art is to release us from these postulated things ( things we must think symbolically about ) and bring us back to the ineffable beauty and richness of the aesthetic component of reality in its immediacy, it must sever its connection with these common sense entities ''.
In the wide range of experiences common to our earth-bound race none is more difficult to manage, more troublesome, and more enduring in its effects than the control of love and hate.
`` History has this in common with every other science: that the historian is not allowed to claim any single piece of knowledge, except where he can justify his claim by exhibiting to himself in the first place, and secondly to any one else who is both able and willing to follow his demonstration, the grounds upon which it is based.
To obey the moral law is just ordinary common sense, applied to a neglected field.
British common sense is proverbial.
is and insects
The total adverse impact of disease, insects, fire, weather, destructive animals, and other forces on the uses and values of forest resources is not generally recognized.
In the United States Department of Agriculture's Yearbook Of Agriculture, 1952, which is devoted entirely to insects, George E. Bohart mentions a site in Utah which was estimated to contain 200,000 nesting females.
Dung offers the same advantage and is also added to repel insects.
Amber becomes abundant long after the Carboniferous, in the Early Cretaceous,, when it is found in association with insects.
Of insects Africa has many thousand different kinds ; of these the locust is the proverbial scourge of the continent, and the ravages of the termites are almost incredible.
In English, the p of the Greek-pt-consonant cluster is typically silent at the beginning of a word ( e. g. pterodactyl, Ptolemy ), but articulated when used in combining forms preceded by a vowel, as in helicopter or the orders of insects: diptera, lepidoptera, etc.
Some Jains abstain from farming because it inevitably entails unintentional killing or injuring of many small animals, such as worms and insects, but agriculture is not forbidden in general and there are Jain farmers.
Its natural diet consists of crustaceans, insects, and annelids, although in captivity it is omnivorous.
This chart shows that not all fish, shellfish, or the insects that they eat can tolerate the same amount of acid ; for example, frogs can tolerate water that is more acidic ( i. e., has a lower pH ) than trout.
Although they were previously considered the sister group to the remaining crustaceans, it is now widely accepted that crustaceans form a paraphyletic group, and Branchiopoda are thought to be sister to a clade comprising Xenocarida ( Remipedia and Cephalocarida ) and Hexapoda ( insects and their relatives ).
Entomological warfare ( EW ) is a type of biological warfare that uses insects to attack the enemy.
There are several Bt toxins and each one is specific to certain target insects.
The European corn borer, one of the primary insects Bt is meant to target, has been shown to be capable of developing resistance to the Bt protein.
Among solitary and primitively social bees, however, lifetime reproduction is among the lowest of all insects, as it is common for females of such species to produce fewer than 25 offspring.
Others, such as raccoons and bears, depending on the local habitat, are more omnivorous ; the giant panda is almost exclusively a herbivore, but will take fish, eggs and insects, while the polar bear's harsh habitat forces it to subsist mainly on prey.
The pollination is usually performed by insects, but wind pollination is also present ( in Coriariaceae and Datiscaceae ).
The Cenozoic is just as much the age of savannas, the age of co-dependent flowering plants and insects, and the age of birds.
Disadvantages ( from the modern perspective ) are that space is used for a whole year, some nutrients might be leached due to exposure to rainfall, and disease producing organisms and insects may not be adequately controlled.
Cloning in biology is the process of producing similar populations of genetically identical individuals that occurs in nature when organisms such as bacteria, insects or plants reproduce asexually.
Coleoptera () is an order of insects commonly called beetles.
While the common chimpanzee is mostly herbivorous, it does eat honey, soil, insects, birds and their eggs, and small to medium-sized mammals, including other primates.
As with endosymbiosis in other insects, the symbiosis is obligate in that neither the bacteria nor the insect is viable without the other.
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