Results 281 to 290 of about 155,969 (295)
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Nymph Anatomy and Instar Determination
2019Knowledge of the external anatomy of Odonata nymphs is necessary for learning how to use the keys for identification. Basic morphology and terminology of all structures crucial for identification of Anisoptera nymphs to family, genus and species are described and illustrated in detail beginning with orientation of the dragonfly nymph body and the basic
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Cannibalism and early instar survival in a larval damselfly
Oecologia, 1994Cannibalism by larval damselflies late in larval development on larvae a few instars smaller has been widely documented. I examine here the survival of eggs oviposited near the end of the flight season of adult Enallagma boreale in the presence and absence of potential cannibals, individuals that hatched from eggs earlier in the season, over an ...
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Photoresponses of second-instar Chaoborus larvae
Journal of Insect Physiology, 1982Abstract The diel vertical migration of Chaoborus larvae varies with larval instar. Although light is involved in the control of vertical migration the contribution of larval photoresponses is unknown. In order to describe ontogenetic changes in larval photoresponses we measured photoresponses of second-instar Chaoborus punctipennis larvae in the
Michael C. Swift +3 more
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A Note on the Use of the Terms Instar and Stage1
Annals of the Entomological Society of America, 1978The terms instar and stadium are not synonymous. An instar forms at the moment of apolysis or as soon as the 1st layer of a new cuticle is laid down underneath the old one. This period in the insect's life is always initially concealed. A stadium begins at the moment of ecdysis, when the instar emerges from either an egg shell, an old larval cuticle ...
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Copepod Instar Survival and Predation by Zooplankton
Journal of the Fisheries Research Board of Canada, 1977The survivorship of each instar of three cohorts of Leptodiaptomus minutus from Bluff Lake, Nova Scotia, is presented. High naupliar mortality but low copepodite mortality occurred. The previously reported values for the predation rate and size selection of prey by omnivorous zooplankton are compared with the observed mortality rates for the different
J. L. Confer, J. M. Cooley
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The Problem of Instar Numbers in Arthropods
2011The last 20 years the distribution of computing power to individuals through personal computers and the subsequent explosion in the production of scientific software dramatically changed the scientific work. The initial availability of expensive statistical software was replaced by inexpensive commercial packages – i.e., SPSS, SYSTAT, SAS, CART among ...
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Biology of the eggs and first-instar larvae
1995Egg-laying behaviour and selection of oviposition sites, coupled with any subsequent redistribution of egg-masses through drift and active dispersal of first instar larvae, are primarily responsible for determining patterns of larval distribution. It is therefore both logical and convenient that they should be considered in combination.
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INSTAR DIFFERENTIATION IN LARVAL CHIRONOMIDAE (DIPTERA)
The Canadian Entomologist, 1974AbstractExamination of the most commonly used criteria for separating instars in larval chironomids, based on a study of 29 species from three subfamilies in Marion Lake, British Columbia, revealed that only head capsule width or length is suitable. Most chironomids appear to have four larval instars.
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Survival of Unfed First-Instar Grasshoppers
The Canadian Entomologist, 1960During some investigations on grasshoppers it became necessary to know how long they would survive without food or water after hatching. The literature contains only scanty observations. Washburn (1911) reported that grasshoppers “freshly hatched, can live from four to five days without food”. Langford (1930) showed that 30 per cent of Melanoplus femur-
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Transactio est Instar Rei Iudicatae
2012Breve scheda di presentazione del noto brocardo: nozione, fonti, sviluppi.
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