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Three Species (three + species)
Selected AbstractsA Taxonomic Study of Immature Stage in Three Species of the Genus Protaetia Burmeister (Coleoptera: Scarabaeoidea, Cetoniidae) from KoreaENTOMOLOGICAL RESEARCH, Issue 4 2003Mi Ae KIM ABSTRACT ABSTRACT The third instar larvae of Korean Protaetia spp., P. brevitarsis seulensis (Kolbe), 1886, P. orientalis submarmorea (Burmeister), 1842, and P. mandschuriensis (Schürhoff), 1933, are described. The larva of the second species is the first record in this genus. A taxonomic key, descriptions, and illustrations of the three species are provided. [source] Effects of Desiccation and Sediment Type on Early Regeneration of Plant Fragments of Three Species of Aquatic MacrophytesINTERNATIONAL REVIEW OF HYDROBIOLOGY, Issue 2 2009Márcio José Silveira Abstract We tested the effects of desiccation and type of sediment (clay or sand) on the regeneration of fragments of the apical shoots of three species of Hydrocharitaceae: Egeria najas, E. densa and Hydrilla verticillata. The shoots were left to dry on clay or sand from zero to four days, and were then returned to aquaria containing water. To approximate natural conditions, the aquaria containing clay had higher turbidity and nutrient (P and N) concentrations than did the aquaria with sand. All species dried faster on sand substrate, which led to lower regeneration (in terms of dry weight, length, sprout and root formation) in this treatment. H. verticillata fragments elongated faster than the other species, but E. najas was the most successful species (in terms of increase in dry weight) in the sand treatment. Our results indicate that the exotic H. verticillata has a competitive advantage, at least in its early stages of regeneration, over the other two, native species, especially in more eutrophic and turbid habitats; whereas E. najas fragments have a competitive advantage in less-turbid, oligotrophic and sand-dominated sites. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Morphology and Infraciliature of Three Species of Metaurostylopsis (Ciliophora, Stichotrichia): M. songi n. sp., M. salina n. sp., and M. marina (Kahl 1932) from Sediments, Saline Ponds, and Coastal WatersTHE JOURNAL OF EUKARYOTIC MICROBIOLOGY, Issue 1 2005Yanli Lei Abstract. Two new urostylid ciliates, Metaurostylopsis songi n. sp. and Metaurostylopsis salina n. sp. and Metaurostylopsis marina (Kahl 1932) are investigated using live observation and protargol impregnation. These species were isolated in Korea from intertidal sediments, saline ponds, and coastal waters. Metaurostylopsis songi is in vivo about 120 ,m × 25 ,m, has a slenderly ellipsoidal body, colorless cortical granules in rows on ventral and dorsal body sides, about 54 macronuclear nodules, 28,47 adoral membranelles, five frontal, two or three frontoterminal and six or seven transverse cirri, and 9,12 midventral cirral pairs followed posteriorly by 1,3 single cirri. In vivo M. salina is about 60 ,m × 25 ,m, has a pyriform body, colorless cortical granules irregularly arranged, about 45 macronuclear nodules, 18,23 adoral membranelles, three frontal, three to five frontoterminal and two to five transverse cirri, and four or five midventral cirral pairs followed posteriorly by five to seven single cirri. Both species have three marginal cirral rows on each body side and 3 long dorsal kineties. The Korean specimens of M. marina match the Chinese population in all main features. Metaurostylopsis songi differs from M. marina by the more slender body, the number of frontal cirri (invariably five vs. four), and the arrangement of cortical granules (in rows on dorsal and ventral cortex vs. only along dorsal kineties and anterior body margin). Metaurostylopsis salina differs from its congeners by the distinctly smaller size, the pyriform body shape, the scattered cortical granules (vs. in rows), and number of frontal cirri. It differs from M. marina also by the number of midventral cirral pairs (four or five vs. seven to 11). [source] Stereology of the Liver in Three Species of Leontopithecus (Lesson, 1840) Callitrichidae , PrimatesANATOMIA, HISTOLOGIA, EMBRYOLOGIA, Issue 3 2004C. H. F. Burity Summary Studies on liver morphology and stereology are relevant to the comparative anatomical and pathological research. They also facilitate the use of non-human primates in basic research, which has substantially supported studies in human medicine. Quantitative studies of liver structures have also been more extensive in Old World primates and other vertebrates. Twenty-three livers of adult lion tamarins were studied (six Leontopithecus rosalia, seven Leontopithecus chrysomelas, and 10 Leontopithecus chrysopygus), dissected, and fixed in 10% neutral buffered formalin solution. For stereological quantification, the liver was regarded as consisting of parenchyma (hepatocytes) and stroma (non-hepatocytes). The volume density (Vv) was determined by point counting, and the disector method was used to obtain the numerical density of hepatocytes (Nv). Hepatic stereological differences among the three species of lion tamarins were not statistically significant. Therefore, the pooled Vv[hepatocyte] and Vv[stroma] could be determined as 96.2 and 7.4%, respectively, and Nv[hepatocyte] as 500.33 × 106 cm,3 . Significantly different, the values found for Vv[hepatocyte] and Nv[hepatocyte] in lion tamarins were, respectively, 0.09 and 2.8 times greater than those in baboons, and 0.17 and 3.8 times greater than those in man. However, the Vv[stroma] was 1.04 times smaller than that in baboons and 1.79 times smaller than that in man. [source] Difference in Intensity of Ant Defense among Three Species of Macaranga Myrmecophytes in a Southeast Asian Dipterocarp Forest,BIOTROPICA, Issue 2 2000Takao Itioka ABSTRACT To examine interspecific variation in the intensity of ant defense among three sympatric species of obligate myrme-cophytes of Macaranga (Euphorbiaceae), we measured the ratio of ant biomass to plant biomass, ant aggressiveness to artificial damage on host plants, and increase in herbivore damage on host plants when symbiont ants were removed. Increase in herbivore damage from two- and four-week ant exclusion varied significantly among the three species. The decreasing order of vulnerability to herbivory was M. winkleri, M. trachyphylla, and M. beccariana. The antip/ant biomass ratio (= rate of the dry weight of whole ant colonies to the dry weight of whole aboveground plant parts) and ant agressiveness also varied significantly among the three species; the orders of both the ant/plant biomass ratio and ant aggressiveness were the same as in the herbivory increase. These results indicated that the intensity of ant defense differs predictably among sympatric species of obligate myrmecophytes on Macaranga. In addition to the interspecific difference in the total intensity of ant defense, when symbiont ants were excluded, both patterns of within-plant variation in the amount of herbivore damage and compositions of herbivore species that caused the damage differed among species. This suggests that the three Macaranga species have different systems of ant defense with reference to what parts of plant tissue are protected and what herbivorous species are avoided by ant defense. Thus, it is important to consider the interspecific variation in ant defense among Macaranga species to understand the herbivore community on Macaranga plants and the mechanisms that promote the coexistence of multiple Macaranga myrmecophytes. [source] | ||||||||||