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At least 181 records · Page 10Linked to original sources
PubMed1990

Environmental regulation of reproduction in an opportunistic breeder: the musk shrew (Insectivora: Suncus murinus).

In summary, photoperiod, social cues and food availability impact upon the reproductive system of the male musk shrew to alter the timing of reproductive maturation and hence opportunistic breeding. We can speculate that there might be a hierarchy to these environmental inputs. We suggest that for shrews living on Guam, food availability is the primary cue, whereas social and photoperiodic signals play modulatory roles. The relative importance of these three external cues most likely depends upon the evolutionary history and current habitat of the organism. In conclusion, opportunistic breeders, such as the musk shrew, may be excellent models for studying the integrative effects of multiple environmental signals on the timing of reproduction.

Animals↗
PubMed1989

Topography and cytoarchitectonics of the nuclei of the posterior part of hypothalamus in insectivora. Part II. Regio premamillaris.

Cross-section paraffin scraps were stained with the methods of Nissl and Klüver-Barrera. A description was given of the topography, shape and cell structure of the nuclei in the regio premamillaris in 3 insectivorous mammals: hedgehog, mole and common shrew. Attention was also given to the nervous centres located in the mentioned region but extending over the whole hypothalamus (nucleus perifornicalis, area hypothalamica lateralis). No differences were observed as to the location of the centres under study, but their cytoarchitectonics differed depending on the species.

Animals↗
PubMed1989

Eimeria cryptotis n. sp. (Apicomplexa: Eimeriidae) from the least shrew, Cryptotis parva (Insectivora: Soricidae), in north-central Texas.

From March through November 1987, 14 least shrews, Cryptotis parva (Say), were collected in portions of north-central Texas and examined for coccidian parasites; only 1 (7.1%) was found to be passing oocysts. Eimeria cryptotis n. sp. is described herein as new and represents the only coccidian reported thus far from C. parva. Sporulated oocysts are subspherical, 16.4 x 15.3 (14-18 x 13-17) microns; shape index 1.1 (1.0-1.2) microns. A micropyle and oocyst residuum are absent, but a polar granule is present. The sporocysts are ovoid, 10.6 x 7.0 (9-11 x 6-8) microns; shape index 1.5 (1.4-1.8) microns. Stieda and substieda bodies and a sporocyst residuum are present. The sporozoites are elongate and only 2 could be observed well enough to measure (11.2 x 2.4 and 8.8 x 2.4 microns) because they are normally obscured by the sporocyst residuum. Sporozoites lack refractile bodies and contain a centrally located nucleus. The new species can be distinguished from the majority of insectivore coccidia on the basis of oocyst size.

Animals↗
PubMed1988

Ultrastructure of the Eimer's organs of the Japanese shrew mole, Urotrichus talpoides (Insectivora, Mammalia) and their changes following infraorbital axotomy.

The Eimer's organ and adjacent structures and their changes after infraorbital axotomy was examined with LM, TEM and SEM in the Japanese shrew mole, Urotrichus talpoides. Approximately 3,000 of Eimer's organ covers the hairless snout tip of this animal. It protrudes to the corium from epidermis, and consists of column-shaped core and the cylindrical peripheral structures. About a dozen of naked fibers ascend vertically in the core; one or a few of them runs amidst the core and the others along its circumferential part. Each fiber has shelf-like endings one in each of 5 to 7 succeeding cells in the upper part of the core. At the uppermost part of the core structure is an opaque degenerating cell. Neurites were considered to grow up with the epidermal cells to which their endings are attached. This pattern of nerve ending was clearly observed for the first time in this study. Usually 3 Merkel cells lie at the base of an Eimer's organ contacting with a soup-plate-shape nerve terminal. In the dermis, an encapsulated corpuscle enveloping a nerve endings is found underneath each Eimer's organ. After axotomy, ipsilateral nerve fibers and their endings totally disappeared from Eimer's organ in a week. Perforation in the domes, flattening of the dome surface, and degeneration of the encapsulated corpuscles appeared on the transected side. In addition to this, several features of degeneration also appeared on the contralateral side. It might be considered as an effect of disuse from the disorders of the other side.

Animals↗
PubMed1986

The brain of Geogale aurita Milne-Edwards and Grandidier 1872 (Tenrecidae, Insectivora).

Macromorphology, composition, and encephalization of the brain of Geogale aurita, a small Madagascan tenrec, were studied. The relative brain size (encephalization) seems to be lower in Geogale than in the Tenrecinae (spiny or bristled tenrecs) which so far have been found to be at the bottom of the encephalization scale of extant mammalian species. Conservative features found in brain macromorphology are e.g. a minute corpus callosum and an uncovered tectum, and such found in brain composition are e.g. an extremely small neocortex and a large medulla oblongata. In all these brain characteristics, Geogale approaches more to the Tenrecinae than to the Oryzorictinae. However, including Geogale in the Tenrecinae would distinctly widen the range of variation of these characters in this subfamily. Therefore, a classification of Geogale in a specific subfamily would be more appropriate.

Animals↗