中国巨松鼠Ratufa bicolor(Sciuridae:Ratufinae)头骨形态的地理学变异

巨松鼠(Ratufa bicolor)是东洋界的特有类群.中国仅有一种,分布于海南、广西西南部、云南南部、西南部、西部和西北部,关于其亚种的分化结论过去主要依据其皮毛的颜色特征.本研究共测取75个巨松鼠头骨,每号头骨标本测取23个变量,运用统计分析软件SPSS 11.0对巨松鼠的可测量变量进行主成分分析、判别分析及聚类分析,以探讨巨松鼠各亚种地位的有效性及其头骨形态的地理学变异.研究结果显示阿萨姆亚种R.b.gigantea和海南亚种R.b.hainana均为有效亚种,前者分布自广西西南部向西经云南南部、西南部、西部达西北部,后者分布于海南.同时,本研究结果不支持滇南亚种R.b.stigmosa作为一个有效的亚种.

Regeneração em cultura de tecido de cultivares de Sorghum bicolor através de organogênese.

2005

The impact of cropping on wild populations of Saguinus mystax and Saguinus fuscicollis in Peru

A transect census technique was used to estimate the population densities of Saguinus mystax and Saguinus fuscicollis at two sites in Peru. Cropping of these two species had occurred five years before the census at one site and two years before at the other. The populations of S. mystax at both sites had recovered completely from cropping, and the relationship between S. mystax and S. fuscicollis had not been altered at one site and had been reversed in favor of S. mystax at the other. Copyright © 1984 Wiley‐Liss, Inc., A Wiley Company

Un modelo de rendimiento para sorgo granífero (Sorghum Bicolor (L.) Moench.)

p.113-123

Partial structure of the phylloxin gene from the giant monkey frog, Phyllomedusa bicolor: parallel cloning of precursor cDNA and genomic DNA from lyophilized skin secretion

Phylloxin is a novel prototype antimicrobial peptide from the skin of Phyllomedusa bicolor. Here, we describe parallel identification and sequencing of phylloxin precursor transcript (mRNA) and partial gene structure (genomic DNA) from the same sample of lyophilized skin secretion using our recently-described cloning technique. The open-reading frame of the phylloxin precursor was identical in nucleotide sequence to that previously reported and alignment with the nucleotide sequence derived from genomic DNA indicated the presence of a 175 bp intron located in a near identical position to that found in the dermaseptins. The highly-conserved structural organization of skin secretion peptide genes in P. bicolor can thus be extended to include that encoding phylloxin (plx). These data further reinforce our assertion that application of the described methodology can provide robust genomic/transcriptomic/peptidomic data without the need for specimen sacrifice.

Validation of urinary cortisol as an indicator of hypothalamic-pituitary-adrenal function in the bearded emperor Tamarin (Saguinus imperator subgrisescens)

The use of cortisol levels as a measure of stress is often complicated by the use of invasive techniques that may increase hypothalamic-pituitary-adrenal (HPA) axis activity during sample collection. The goal of this study was to collect samples noninvasively and validate an enzyme-immunoassay (EIA) for the measurement of cortisol in urine to quantify HPA axis activity in the bearded emperor tamarin (Saguinus imperator subgrisescens). Urine samples were collected from trained subjects between 0700 and 0730 hr during a 1-month period, and were pooled for immunological validation. We validated the assay immunologically by demonstrating specificity, accuracy, precision, and sensitivity. For biological validation of the assay, we showed that levels of urinary cortisol (in samples collected between 0700 and 1700 hr) varied significantly across the day. Cortisol concentration was lowest at 0700 hr, increased to a mid-morning peak (0900 hr), and declined across the remainder of the day in a typical mammalian circadian pattern. We thus demonstrate that urinary cortisol can be used to quantify HPA activity in S. i. subgrisescens. (C) 2004 Wiley-Liss, Inc.

Sleeping site selection by the golden-handed tamarin Saguinus midas midas: The role of predation risk, proximity to feeding sites, and territorial defence

Tamarin monkeys, of the genus Saguinus, spend over half their lives at arboreal sleeping sites. The decision as to which site to use is likely to have considerable fitness consequences. These decisions about sleeping sites by three troops of golden-handed tamarin Saguinus midas midas were examined over a 9-mo period at a rainforest site in French Guiana. Data are presented on the physical nature of sleeping sites, their number, position within home ranges, and pattern of use and reuse, aspects of behaviour at retirement and egress, and predation attempts on the study troops. Cumulative plot analysis indicated that a tamarin troop used 30-40 sleeping sites in a 100-day period, approximately half of which were used very infrequently, so that consecutive reuse was never greater than three nights. Sleeping trees were superior in architectural parameters and liana weight to non-sleeping trees. There were no more sleeping sites than expected within the home range boundary region of the tamarins or in areas of overlap with the home ranges of neighbouring troops. Tamarins selected sleeping sites nearest to the last feeding site of the day on 25% of occasions. The study troops engaged in a number of activities that may reduce predation risk; raptor attacks on the study troops over 9 mo were frequent but unsuccessful. Tamarins often visited a sleeping site several hours before arrival, and were more likely to visit a site before use if they had not used it recently. The decision to select a sleeping site therefore involved knowledge of the previous frequency of use of that site.

A COMPARATIVE STUDY OF LASAEA AUSTRALIS, VULSELLA SPONGIARUM, PINNA BICOLOR AND DONACILLA CUNEATA (MOLLUSCA; BIVALVIA) FROM PRINCESS ROYAL HARBOUR, WESTERN AUSTRALIA

Monthly samples of L. australis, V. spongiartum, P. bicolor and D. cuneata were collected over a period of 12 months from Princess Royal Harbour, Western Australia. Preliminary information on densities and biomass is given. Gonad histology points to seasonal reproductive cycles with autumn spawning in P. bicolor and D. cuneata and irregular spawning in V. spongiantm and L. australis. However, L. australis did show two peaks of larval brooding in the study period. Length-frequency data are discussed in the light of the proposed reproductive patterns for the four species. Allometric relationships between length and both height and width for all species are described and their value to each species assessed. Populations of L. australis from different habitats show significant differences in shell shape.

Comportamiento de genotipos contrastantes de sorgo (Sorghum bicolor(L.) Moench), bajo dos métodos de siembra y cuatro densidades de población y viabilidad económica de la siembra al voleo

Tesis (Maestría en Ciencias Especialista en Producción Agrícola) UANL

Variabilidad del caracter Glossy y cera epicuticular en sorgo (Sorghum bicolor (L) Moench) y su relación con la resistencia a sequía

Tesis (Maestría en Ciencias Especialidad en Producción Agrícola) UANL

Expresión fenotipica de sorgo (Sorghum bicolor (L.) Moench) Tropical adaptado bajo cuatro condiciones de humedad

Tesis (Maestría en Ciencias Especialidad en Producción Agrícola) UANL