共查询到20条相似文献，搜索用时 156 毫秒
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在模拟棘胸蛙的野生态环境情况下,通过人工控制养殖池水的水温和酸碱度,根据棘胸蛙的生活特性,合理进行亲蛙选育、蝌蚪培育、幼蛙饲养和病害防治的技术改良,可以达到棘胸蛙年产卵次数达6～7次,年产卵量达1935粒,蛙卵孵化率达96.1%,蝌蚪变态率达96.5%,幼蛙成活率达96.8%的养殖效果。 相似文献
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通过１９８６年５～１０月间对粤北山区棘胸蛙的生活环境、食性、寄生虫和当地人工饲养棘胸蛙等的初步调查．发现棘胸蛙适应生活在气温２０５～２５０℃,水温１９５～２２５℃,相对湿度在８３％以上的山间小溪中,山溪的海拔高度在３００～７６０ｍ之间,水质偏酸性（ｐＨ４０～６０）．棘胸蛙以昆虫为主食,兼食蚯蚓等其他小动物．棘胸蛙的消化道和体表均发现寄生虫．广东省乳源县有人用大水缸小量饲养棘胸蛙初步获成功 相似文献
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用PIT-tag标签标记了69(33♀♀,36♂♂),测量了6月龄(亚成体)和成体棘胸蛙的7个形态特征指标(体长、头长、头宽、腹长、前肢长、后肢长和体重),用于分析棘胸蛙两性形态特征在个体发育过程的变化。结果表明:亚成体棘胸蛙两性在头宽和前肢长上差异显著,头宽和前肢长雄性均大于雌性,而其它形态特征差异不显著。成体棘胸蛙除头长这一形态指标没有差异外,其它6个形态特征差异显著,其中腹长雌性大于雄性,而其他五个指标雄性均大于雌性。我们的结果表明,棘胸蛙在个体发育过程中雌性有较大的腹长与生育力选择的作用有关,而雄性具有较大的体长、头宽和前肢长与性选择有关。 相似文献
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童微星 《浙江农村技术师范专科学校学报》1998,11(3):54-55,49
本文对棘胸蛙(Rana spinosa David)在宁波平原地区的人工繁殖和养殖进行了初步的研究,其中包括人工授精和人工孵化;蝌蚪,幼蛙和成蛙的养殖等。对于卵巢发育程度良好的雌蛙,可以100％地催产成功。平均孵化率选74％以上．孵化条件合适时可以达到90％以上。5日龄蝌蚪的成活率选90％以上,80～90d即可变态成幼蛙。幼蛙经过6个月的饲养平均个体重达100g以上,鲜活饵料的料肉比为4．1：1。 相似文献
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黄鳝体内新棘衣棘头虫的感染研究 总被引：9，自引：0，他引：9
本文以黄鳝为材料．研究了黄鳝体内新棘衣棘头虫的感染情况，发现：黄鳝的感染率为３８．３％，感染强度为４．６５，平均密度为１．７８；黄鳝体长为２０１—３５０ｍｍ范围时．其感染率、感染强度随着体长的增大而增大，感染率范围为２３．５％－６６．７％，感染强度范围为２．７５—７．２５。 相似文献
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李慧芸 《陕西教育学院学报》2012,(3):90-94
以火棘为原料,对采用固定化醋酸菌酿造火棘果醋的醋酸发酵工艺进行了研究。对发酵温度、接种量、酒精度三个影响因素进行正交试验,结果表明,固定化醋酸菌酿造火棘果醋的最佳工艺为:发酵温度34℃,接种量10%,酒精度7%。所得火棘果醋醋香浓郁,酸甜适度,香气自然、协调,是一种值得开发的保健果醋。 相似文献
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王立志 《陕西教育学院学报》2012,28(4):86-89
记述了陕西省两个缓步动物新纪录种,它们是凯氏棘甲熊虫Echiniscus clevelandi Beasley,1999(异缓步纲,棘甲熊虫科)和锯刺棘甲熊虫Echiniscus spiniger Richters,1904(异缓步纲,棘甲熊虫科). 相似文献
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This study examined the effects on child language and amount of food eaten by five preschool children in a day care setting of withdrawing two components of the regular mid‐day meal routine. The two components were having an adult seated at the table with the children and allowing children to serve their own food. Child language was more affected by withdrawal of the two components than was amount of food eaten. Withdrawal of the seated adult had a more powerful effect in reducing child language, than did withdrawal of self‐serving of food. Amount eaten was reduced only when both components were withdrawn simultaneously. Findings were discussed in terms of the implications of setting events for theory and practice of applied behaviour analysis. 相似文献
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李冰 《南昌教育学院学报》2013,(2):20+22
毛姆的代表作《月亮和六便士》以法国印象派画家高更的生活经历为原型,塑造了一个逃避社会和追求艺术的画家思特里克兰德的形象。文章通过对故事主人公形象的分析,探讨了月亮和六便士在当时社会的象征意义,反映出毛姆对人性的思索。 相似文献
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In each of two experiments, different groups of pigeons were required to discriminate between one of two basic kinds of stimulus differences: stimulus quality or stimulus location. For stimulus-quality groups, a key was illuminated by one of two colors on trials ending with food delivery and by the other color on trials ending with no food. For stimulus-location groups, a key was illuminated at one of two locations on trials ending with food delivery and at the other location on trials ending with no food. The birds began to respond differentially to the stimuli (i.e., peck the keys on food trials and not peck the keys on no-food trials) earlier in acquisiton if the stimulus qualities served as the signals for trial outcomes than if the stimulus locations served as those signals. The results from both experiments are consistent with predictions from a hypothesis regarding interactions among the qualities and locations of stimuli and responses (the “quality-location hypothesis”). Furthermore, the present results support other recent demonstrations of the important role that spatial relations among stimuli can play in classical conditioning. 相似文献
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食品安全关乎老百姓的生命,也关乎社会的安全和稳定。改革开放三十年来,我国经历了从吃不饱到能吃饱,从能吃饱到要吃好的历史性转变。在这个过程中,一些重大的食品安全事件频频发生,随着食品安全事件的不断出现,食品安全问题逐渐成为人们所关注问题的焦点。以广东省为例,通过分析广东省食品安全监管方面存在的问题及原因,探索解决中国食品安全监管问题的可行路径。 相似文献
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Bennetf G. Galef 《Learning & behavior》1990,18(4):347-351
Rats that (1) either ate a small sample of one or two foods (Diet A or Diet B) or interacted with a demonstrator that had eaten either Diet A or Diet B, (2) ate both Diets A and B in succession, and (3) were made ill preferred whichever of the two foods they or their respective demonstrators had eaten. Although eating a food and interacting with a demonstrator that had eaten that food were each sufficient to enhance preference for the food, eating particles of food clinging to the fur of a demonstrator was not necessary for enhancement of preference for the food that a demonstrator ate. Subjects exposed to demonstrators they could not physically contact still exhibited enhanced preference for the food that their demonstrator had eaten. The data were discussed as indicating that although smelling a diet, eating a diet, and interacting with a demonstrator that had eaten a diet can each enhance preference for that diet, it cannot be inferred that eating a food, smelling a food, and interacting with a demonstrator that has eaten a food each affect diet preference via the same process. 相似文献
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Shigeru Watanabe 《Learning & behavior》1997,25(2):185-192
Pigeons were trained on two visual discrimination tasks. One task was discrimination between real objects and their photographs. Training stimuli consisted of real food (grains), photographs of food, and nonedible junk objects and their photographs. The other task was discrimination between food and nonfood using the same stimuli as those in the first task. The pigeons learned either task and showed generalization of these classifications to novel stimuli. These results suggest that pigeons can either discriminate or integrate real stimuli and their photographs. Bilateral ectostriatal lesions caused deficits in food versus nonfood discrimination, but not in object versus picture discrimination. This dissociation suggests different brain mechanisms between the two visual discriminations using the same stimuli. 相似文献
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William S. Maki 《Learning & behavior》1979,7(1):31-37
Pigeons performed a delayed matching-to-sample task in which they matched red and green disks as comparison stimuli to samples of food and no food. The birds were also taught a discrimination between two lines: vertical (S+) followed by food and horizontal (S?) followed by no food. The two kinds of trials were then chained in infrequent probes such that (a) S+ and S? preceded samples of food and no food, (b) a longer than usual delay occurred, and then, (c) the comparison stimuli were presented. Therefore, in probes when S+ preceded food and S? preceded no food, the samples were “expected. ” But in probes when S+ signaled no food and S? signaled food, the samples were “surprising. ” Matching to surprising samples was more accurate than matching to expected samples. This result completes a pattern of findings implying that surprising reinforcers enhance learning and also persist (are longer rehearsed) in short-term memory. 相似文献
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杨莹 《开封教育学院学报》2011,31(3):6-12,36
食品贮存加工是中国饮食文化和中国科技发展的重要内容,宋代的食品贮存加工大体可分为保鲜贮存加工与干制贮存加工两大技术类型。宋代保鲜贮存的方法有：窖藏法、冷藏法、密封法、混放法、灰藏法等,保鲜贮存多应用于粮食与果蔬食品;而宋代食品的干制贮存,根据不同的方法与特色,可分为：干燥法、腌制法、糟制法和糖制法。宋人在腌制食品的过程中能够结合加热和日晒等方法,使腌制贮存效果达到最佳。 相似文献
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方前移 《阜阳师范学院学报(社会科学版)》2013,(2)
20世纪30年代初期,中国粮食经济发生恐慌。面对内外双重危机,南京国民政府加强对粮食贸易的干预。维护粮食自由流通和抵制洋米倾销实际上成为中央政府必须解决的两大粮食流通主题。但是,由于中央政府威权有限,粮食关税政策不能独立自主,始终不能解决省县各自为禁、洋米倾销问题。战前,粮食贸易政策陷入诸多困境之中。 相似文献