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Showing 1 to 20 of 32 for “"Moulting"”.
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African penguin (Spheniscus demersus) distribution during the non-breeding season : preparation for, and recovery from, a moulting fast
Little is currently known about the spatial ecology of the endangered African penguin during the non-breeding season. As foraging success during this period is critical to adult survival, this project explores their dispersal patterns, as well as the degree of overlap with commercial purse-seine …
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Biogeographic and biological comparisons between the Emu Bay Shale (Kangaroo Island, South Australia) and other Cambrian Burgess Shale-type biotas
… of the EBS biota, namely an examination of the moulting habits of two common trilobite species from the Emu Bay Shale, Estaingia bilobata Pocock, 1964 and Redlichia takooensis Lu, 1950, and how this compares with other BST assemblages. Specimens from the EBS were examined and arrangements of …
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Stimulus Control in the King Snake (<em>Lampropeltis getulus getulus</em>)
… reversal could be obtained.</p> <p>Moulting was found to decrease body weight and responding. Also, discrimination was less effective during moulting for three of the four subjects. There was evidence to indicate that the opaque covering interferes with responding. Once the covering …
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Using stable isotopes to trace the movements of ducks in southern Africa
… signatures of feathers grown at different moulting locations were compared to test whether southern Africa shows stable isotope spatial patterns (distinct isotopic regions). Feathers grown at different life-phases were compared to test whether different sites had been used and if more …
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Key role and diversity of EcR/USP and other nuclear receptors in selected Arthropoda species
… of biological processes. Their involvement in moulting and metamorphosis, embryonic development, cell differentiation and reproduction of arthropods is well documented. Especially the two NRs that form the functional ecdysteroid receptor and which are at the base of the ecdysteroid signalling …
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Operant Conditioning in the King Snake (<em>Lampropeltis getulus getulus</em>)
… support the Kleinginna's results (1970)p that moulting decreased the conditioned response rate, but does not completely disrupt conditioning.</p>
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The Use of the Ostracode Cyprideis Americana (Sharpe) as a Proxy for Salinity in Bahamian Lake Systems
… trends, potentially due to the breeding and moulting habits of C. americana. Temperature was more correlative with valve composition than a previous study of C. americana suggests, but is supportive of similar correlations of Cyprideis species in continental and other island settings. The …
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Penguins and purse-seiners : competition or co-existence?
… were confined to the breeding islands during moulting and were high in March and July during breeding peaks. While most penguin group sizes were small (one or two birds), over 44 % of penguins occurred in groups of more than 10 birds. Three stereotypic penguin group formations occurred: …
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Histone modification during the induction of tyrosine transaminase
… at the genetic level. Injection of the insect moulting hormone, ecdysone, into last instar larvae of Chironomus tentans results in puff formation at specific loci of the chromosomes shortly after hormone administration. Since puffs are local and reversible alterations of the chromosome, formed …
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The influence of thermal polution on various aspects of the biology of three species of crab
… of 26°C being detrimental, especially during moulting in P. chabrus and H. orbiculare. The energy budget and energetic efficiencies are calculated for all the species and it appears that the increased temperatures around Koeberg Power Station will be beneficial to the adult crab species.
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The ecology of the Red-vented Bulbul in Fiji.
… species are discussed. The Bulbul has a fixed moulting season everywhere and there is marked synchrony within all populations . 'Ihe individual moult probably takes 100-120 days. In India, t he moulting season generally occurs in the rainy season but in the Bulbul's naturalized range in the …
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Moult as a dynamic link in the annual cycle of birds: insights from seabirds and a long-distance migratory raptor
… flight feathers and primary coverts in 100 non-moulting Amur Falcons. There are seven chapters including an introductory first chapter. In Chapter 1, I introduce the importance of feathers and why maintaining their quality is key to birds' survival. Feathers are dead structures once formed, and …
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Biology and ecology of the deep-water rock lobsters Palinurus gilchristi and Palinurus delagoae in relation to their fisheries
… maturity, female fecundity, mortality rates, moulting, recruitment and migration; (2) assessment of the effect of fishing with different gear types or arrays on abundance and its indices; and (3) incorporation of new information into resource assessments, with recommendations aiming to improve …
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Ecological energetics of Eudyptes penguins at Marion Island
… two species during their respective breeding and moulting cycles at the island. Resting metabolic rates, calculated from lowest, stable rates of oxygen consumption over 24 h, averaged 25 % greater than basal metabolic rates predicted from allometric equations. Body temperatures of the penguins and …
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Effects of photoperiod, temperature, and diet on the development of the banded woollybear, Pyrrharctia (Isia) isabella (J. E. Smith) (Lepidoptera: Arctiidae).
… diets and fresh plantain. The times of moulting, head capsule widths, larval and pupal weights, and adult characteristics (fertility, sex) were recorded. Larvae were easily reared on bean, wheat germ, casein-wheat germ and fresh plantain, while casein, alfalfa, and plantain diets proved …
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Characterisation of quiescin-sulfhydryl oxidase and nematode astacin mutants using functional studies in caenorhabditis elegans.
… is synthesised and the old cuticle is shed. Moulting occurs by proteolytic digestion and shedding of an anterior cuticular cap which provides an opening for the nematode to escape the previous stage cuticle. Both free-living and parasitic nematodes shed and exsheath their cuticles in this …
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Comparative ecology of Pachyptila species breeding sympatrically at Gough Island
… one P. vittata individual that moved east. Moulting was inferred from a marked reduction in the time spent in flight, which occurred shortly after arrival on the non-breeding grounds by both species (i.e. November– February for P. vittata and February–June for P. macgillivrayi). Moulting …
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Baseline surveys and metal binding proteins as metal pollution indicators
… er i ter ia, for example, the out of season moulting of crayfish. The new definition of metal pollution has then been tested by application to five different organisms (crayfish, Jasus lalandii; hermit crab, Diogenes brevirostris; shrimp, Palaemon pacificus; black mussel, Choromytilus …
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Ecology and conservation of albatrosses and petrels at sea off Brazil
… Procellariiformes appear to have two distinct moulting strategies: petrels and shearwaters have complete annual moult, start to moult during the breeding period, and replace several primaries and tail feathers at one time, whereas albatrosses undergo long moulting cycles, replace less feathers …
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The effects of prey availability on the endangered bank cormorant Phalacroxorax neglectus
… aspects including the life - history traits and moulting stages of this particular rock lobster species may be the reason to this response. Second, I present foraging effort data of bank cormorants in localities known to be situated in areas with different prey availability. I found that at …
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