Download Dragonfly genera of the New World: an illustrated and by R.W. Garrison, N. von Ellenrieder, J.A. Louton PDF

April 4, 2017 | Zoology | By admin | 0 Comments

By R.W. Garrison, N. von Ellenrieder, J.A. Louton

Книга представляет собой прекрасно иллюстрированное и детальное руководство по систематике и экологии стрекоз Северной, Центральной и Южной Америки. Хотя стрекозы и являются одной из самых изученных групп насекомых, до настоящего момента не существовало пособия, позволяющего определять их роды или даже группы родов в Новом Свете. Книга представляет собой иллюстрированный и современный определитель для всех родов стрекоз с описанием каждого рода, снабжена картами распространения и 1595 диагностическими иллюстрациями, включая образцы жилкования крыльев и характеристики гениталий.
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Extra resources for Dragonfly genera of the New World: an illustrated and annotated key to the Anisoptera

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2 Successions on old fields in Minnesota: a study in time and space ‘Ecological succession’ is a concept that must be familiar to many who have simply taken a walk in open country – the idea that a newly created habitat, or one in which a disturbance has created an opening, will be inhabited, in turn, by a variety of species appearing and disappearing in some recognizably repeatable sequence. Widespread familiarity with the idea, however, does not mean that we understand fully the processes that drive or fine-tune successions; yet developing such understanding is important not just because succession is one of the fundamental forces structuring ecological communities, but also because human disturbance of natural communities has become ever more frequent and profound.

10 0 160 SO42– 120 80 0 100 Ca2+ 60 40 20 0 1964 1968 1972 1976 1980 Year 1984 1988 1992 An associated reduction in bird populations in the forest may even be linked to this scenario. These unanswered questions are the subject of new phases of research at Hubbard Brook. 4 A modeling study: to discover why Asian vultures were heading for extinction vulture populations in India and Pakistan were declining by 22–50% per year In 1997, vultures in India and Pakistan began dropping from their perches.

Care was taken not to succumb to the temptation of choosing sites with easy access (near roads or bridges) in case this biased the results. The sites were classified as containing: (i) no fish; (ii) Galaxias only; (iii) trout only; or (iv) both Galaxias and trout. ). A statistical procedure called multiple discriminant functions analysis was then used to determine which physical variables, if any, distinguished one type of site from another. 1. Trout occurred almost invariably below waterfalls that were large enough to prevent their upstream migration; they tended to occur at low elevations because sites without waterfalls downstream tended to be at lower elevation.

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