Eating Disorders: [Ecology of the Ringed Seal (Pusa Hispida) From the Bering Strait in the Late Holocene].
[Ecology of the ringed seal (Pusa hispida) from the Bering Strait in the late Holocene].
Filed under: Eating Disorders
Izv Akad Nauk Ser Biol. 2012 Sep-Oct; 546-53
The combined use of analysis of stable isotopes and archeozoological methods with respect to bony material from an ancient Eskimo settlement (dated 2370-810 years ago) made it possible to reveal the main distinguishing features of ringed seal in the past. On the basis of the data obtained, we suppose that in the late Holocene in the water area of the Bering Strait, there were seals of two different ecotopes: those reproducing on fast ice and those on pack ice differing not only in habitats, but also in the proportion of different food items in the diet. The ringed seals caught by ancient Eskimos during their life had a mixed diet consisting of crustaceans and fish, but in most individuals, a shift towards fish eating was observed. No significant changes in the feeding related to spawning were recorded. The dependence of feeding on body size was shown: bigger, mature individuals occupied higher trophic positions.
HubMed – eating
[Antijuvenile influence of the precocene on the development of adult antennae in the apple surface eating tortricid Archips podana Scop. (Lepidoptera: Tortricidae)].
Filed under: Eating Disorders
Izv Akad Nauk Ser Biol. 2012 Sep-Oct; 501-8
The influence ofprecocene II, an antijuvenile agent, on the development of adult antennae in the apple surface eating tortricid A. podana Scop was demonstrated. Treatment of the fifth instar larvae and prepupae with different doses of precocene proved to cause different sensitivity of the specimens to the juvenile hormone deficit. Treatment with 450 and 600 microg precocene per specimen during the first days after ecdysis to the fifth instar caused the death of larvae. Treatment with 300, 450, and 600 microg per specimen on the third day of the fifth instar larvae and prepupae caused a delay in the development of adult antennae. The results are discussed with respect to the role of the juvenile hormone in the development of imaginal structures during metamorphosis.
HubMed – eating
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