Search results for "Aplysia"

showing 3 items of 13 documents

Spermatocyte Chromosomes in Some Species of the Family Aplysiidae (Gastropoda, Opisthobranchia)

1982

SUMMARYCounting spermatocyte bivalents, we have determined the haploid number n = 16 for Aplysia depilans and A. punctata, and n = 17 for A. limacina. We have confirmed n = 17 for Bursatella leachii. Male diakinetic bivalents are probably chiasmatic in all the species examined. The orders Nudibranchia and Notaspidea, possessing haploid values of 13 and 12 chromosomes respectively, seem to be more evolved than the other orders of the sub-class Opisthobranchia.

biologyAplysia depilansBotanyGastropodaGeneticsOpisthobranchiaAplysiidaeLimacinaBursatella leachiiPloidyGeneral Agricultural and Biological Sciencesbiology.organism_classificationNotaspideaCaryologia
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Pheromones linked to sexual behaviors excite the appetitive phase of feeding behavior of Aplysia fasciata . I. Modulation and excitation of appetitiv…

1998

Pheromones presumably secreted by mating conspecifics – as well as homogenates containing tissue that is homologous with the atrial gland – increase the time that Aplysia fasciata spend feeding. This effect is caused by increasing the number of feeding episodes initiated in response to food, whereas the duration of a feeding bout remains unchanged. The increase in the number of feeding episodes is related to increases in head waving and crawling, i.e., appetitive movements that bring the animal into contact with food, as well as an increase in the responsiveness to food after it is contacted. Releasing a homogenate containing atrial gland tissue, or egg laying hormone, in the water near the…

medicine.medical_specialtyPhysiologyBiologyAplysia fasciatabiology.organism_classificationBehavioral NeuroscienceEndocrinologyFeeding behaviorSex pheromoneInternal medicineAplysiaFacilitationmedicinePheromoneAnimal Science and ZoologyMatingEcology Evolution Behavior and SystematicsHormoneJournal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology
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Pheromones linked to sexual behaviors excite the appetitive phase of feeding behavior of Aplysia fasciata II. Excitation of C-PR, a neuron involved i…

1998

Pheromones presumably released by conspecifics amplify both the appetitive and the consummatory components of feeding in Aplysia. These effects can be mimicked by administering homogenate of the large hermaphroditic duct containing atrial gland tissue, as well as peptides from the bag cells. Identified cerebro-pedal regulator (C-PR) neuron is thought to command various behaviors that comprise the appetitive phase of feeding. In a reduced preparation, we investigated the effects on the C-PR of applying these substances to the rhinophores, the sensory organs which detect pheromones. Stimuli that excite feeding in the animal were also found to affect the C-PR. Large hermaphroditic duct homogen…

medicine.medical_specialtyPhysiologySensory systemBiologyAplysia fasciatabiology.organism_classificationCell biologyBehavioral NeuroscienceEndocrinologymedicine.anatomical_structureInternal medicineAplysiaSex pheromonemedicineExcitatory postsynaptic potentialPheromoneAnimal Science and ZoologyNeuronEcology Evolution Behavior and SystematicsHormoneJournal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology
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