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1.
鱼类主要分布于青藏高原周边,是一群适合于急流生活的科鱼类。在独龙江流域7个点共采集271号鱼类标本(隶属属、属和异齿属),结合各采集点数据绘制大鳍异齿、藏和扁头的分布直方图,结果显示,藏(E. labiatum)在流速较快的独龙江下游各采集点的种群数量较上游高,更适应急流生境。同时研究了这3种鱼类的体长与体重的关系,参数b(W=aLb)的范围在2.8201和3.0131之间,均为异速生长;藏的生长类型最接近等速生长。  相似文献   

2.
实验条件下小型啮齿动物体重与体长模型的数值拟合   总被引:1,自引:0,他引:1  
李仲来 《兽类学报》2000,20(2):157-160
曲线拟合是生态学模型的重要研究内容之一。国内外对实验条件下的小型啮齿动物的体重与体长的研究可分为 3类 :附原始数据并给出体重与体长的 Lagler模型 ;附原始数据和体重与体长图形 ;给出体重与体长的图形或 L agler模型 ,但缺少比较系统的分析和总结。虽然查阅了国外近几十年的有关论文 ,但有些文献仅能看到摘要或题目 ,因此 ,本文仅对国内附原始数据的论文作进一步探讨。1 材料来源与方法  用于分析实验条件下啮齿类的体重与体长增长动态的原始数据来自板齿鼠 ( Bandicota indica) [1]、草原兔尾鼠 ( L agurus lagurus) [2 ]、黄…  相似文献   

3.
鱼类体长与体重关系中的分形特征   总被引:38,自引:3,他引:38  
运用分形理论得到了描述鱼类形态的基本关系式,既扩展了传统上对鱼类形状描述的思路,又回答了鱼类体长-体重关系式W=bLa在实际运用中长期存在的量纲不和谐问题。还对体长-体重函数关系的普适性、参数a和鱼类生长发育过程的阶段性、鱼类肥满度定义等进行了分析和讨论.  相似文献   

4.
1991~ 1998年对内蒙古阿巴嘎旗那仁宝力格苏木布氏田鼠 (Microtusbrandti)体长、体重和胴体重资料进行了调查和分析 ,得到如下结论 :田鼠体长、体重、胴体重的均值在低密度回升期均逐年增高 ;雌性越冬鼠的胴体重均值低于雄性越冬鼠且有显著性差异 (P <0 0 5 ) ;秋季雄鼠与雌鼠的 3项指标的均值无显著差异(P >0 10 ) ,体长、体重和胴体重间相关极显著 (P =0 0 0 0 1)。分别给出了体重与体长 :胴体重与体长的模型W =aLb,其中W为体重或胴体重 ,L为体长 ;胴体重与体重的关系适合于模型NW =W / (a bW ) ,其中NW为胴体重 ,W为体重。  相似文献   

5.
独龙江流域鰋鮡鱼类分布特征及其体长与体重的关系   总被引:1,自引:0,他引:1  
鰋鮡鱼类主要分布于青藏高原周边,是一群适合于急流生活的鮡科鱼类。在独龙江流域7个点共采集271号鰋鮡鱼类标本(隶属鮡属、鰋属和异齿鰋属),结合各采集点数据绘制大鳍异齿鰋、藏鰋和扁头鮡的分布直方图,结果显示,藏鰋(E.labiatum)在流速较快的独龙江下游各采集点的种群数量较上游高,更适应急流生境。同时研究了这3种鰋鮡鱼类的体长与体重的关系,参数b(W=aL^b)的范围在2.8201和3.0131之间,均为异速生长;藏鰋的生长类型最接近等速生长.  相似文献   

6.
博斯腾湖鱼类资源组成、体长与体重关系及生长状况   总被引:1,自引:0,他引:1  
博斯腾湖为西北高原地区湖泊,1958年开始商业化渔业生产,1962年开始鱼类引种工作,半个多世纪以来湖区鱼类资源组成处于不断的变动当中。本文围绕湖区鱼类群落组成动态、当前鱼类的体长与体重关系及种群生长状况开展研究,于2019年春季(4月)、夏季(8月)、秋季(10月),通过渔具采样和渔获物调查相结合的方法,在博斯腾湖共发现鱼类17种,隶属于4目8科,其中?(Hemiculter leucisculus)、池沼公鱼(Hypomesus olidus)、鲫(Carassius auratus)为优势种,鱼类资源结构小型化问题严重。描述了15种鱼类体长-体重关系与生长情况,其中12种鱼类为正异速生长,3种鱼类为负异速生长,优势鱼类的体长-体重关系式参数b值范围2. 95~3. 56,决定系数r2值范围0. 874~0. 997。本研究所得结果可为博斯腾湖鱼类资源保护与可持续利用提供基础资料和科学支撑。  相似文献   

7.
(鱼匽)(鱼兆)鱼类主要分布于青藏高原周边, 是一群适合于急流生活的(鱼兆)科鱼类. 在独龙江流域7个点共采集271号(鱼匽)(鱼兆)鱼类标本(隶属(鱼兆)属、(鱼匽)属和异齿(鱼匽)属), 结合各采集点数据绘制大鳍异齿(鱼匽)、藏(鱼匽)和扁头(鱼兆)的分布直方图, 结果显示, 藏(鱼匽)(E. labiatum)在流速较快的独龙江下游各采集点的种群数量较上游高, 更适应急流生境. 同时研究了这3种(鱼匽)(鱼兆)鱼类的体长与体重的关系, 参数b(W=aLb)的范围在2.8201和3.0131之间, 均为异速生长;藏(鱼匽)的生长类型最接近等速生长.  相似文献   

8.
罗清 《动物学研究》2007,28(1):101-103
运用简单线性相关及回归分析方法,对人工圈养条件下20头太平洋瓶鼻海豚(Tursiopsgilli)的体重与体长的相关性分析结果表明,海豚体重与体长呈显著正相关(r=0.960,P<0.01),其体重随体长变化的回归方程为^Y=2.19X-368.65;体重与体长的比值随着体长的增加而增加,且呈直线趋势。依据海豚体重与体长的相关分析来控制其体重,从而提高科学饲养管理水平,使海豚的摄食量、训练行为与健康之间保持平衡,是很有必要的。  相似文献   

9.
鲤鱼微卫星标记与体重、体长和体高性状的相关分析   总被引:21,自引:2,他引:19  
张义凤  张研  鲁翠云  曹顶臣  孙效文 《遗传》2008,30(5):613-619
利用47个鲤鱼微卫星标记, 对柏氏鲤和荷包红鲤抗寒品系自交F2代的92个个体基因组DNA进行检测, 得到162个等位基因, 各座位等位基因数2~6个, 片段长度100~444 bp, 有效等位基因数1.3069~4.2288, 杂合度0.2361~0.7677, 位点多态信息含量0.5368。利用统计软件SPSS的GLM程序对47个微卫星标记与鲤鱼体重、体长和体高相关性进行了分析, 结果表明HLJ695、HLJ716、HLJ739、HLJ759、HLJ774、K16与体重、体长和体高相关, HLJ776与体高相关。对同一标记不同基因型间进行多重比较, 找到与3种性状相关的基因型。  相似文献   

10.
提要本文重新描述华南和新疆上三叠统和下侏罗统20枚甲虫模式标本,共识别出Cupedidae科3属5种,Elateridae科4属4种,Permosynidae科4属5种,Schizocoleidae科2属3种,未定科3属3种。将Notocupoides fasciatus Ponomarenko,1966归入Notocupes,建立一新种Notocupes lini sp.nov.;基于Ademosynoides chinaticus Lin,1992建立一新属Toksunius gen.nov.,形成一新组合Toksunius chinaticus(Lin,1922)comb.nov.。  相似文献   

11.
The relationship between body length and biomass (dry weight) was investigated for nineteen taxa of terres trail arthropods and for the combined sample that included all insect taxa. The specimens were collected from forests of Bicholim taluk of Goa. Four models were evaluated, a linear function, a logarithmic function, a power function and an exponential function. The linear function best describes dry weights in the order Isopoda of class Crustacea and dictyopteran, coleopteran larvae of class Insecta. The logarithmic function fits well for only one group namely Opiliones of class Arachnida. The power functions fits best for Scutigeromorpha and Scolopendromorpha of class Chilopoda, Araneae of class Arachnida, Collembola, Thysanura, Orthoptera, Hemiptera, Homoptera, coleopteran adults, Diptera, lepidopteran adults and Hymenoptera of class Insecta and the combined data on adult insects. An exponential function fits well for the dermapteran and lepidopteran larvae of class Insecta. The usefulness of these estimates of Arthropod biomass in community ecology is discussed.  相似文献   

12.
    
Regeneration has been a topic of interest across a range of taxa for centuries, and arthropods are no exception. Trade-offs associated with regeneration are likely to involve the reallocation of resources away from other metabolic activities such as growth, development or reproduction. This might be reflected in costs to some developmental traits of the organism, despite regeneration being advantageous. These associated costs might also differ with the stage of injury or amputation. Here, we hypothesise that the extent of regeneration and trade-offs associated with it may be stage-specific. To test this hypothesis, the right forelimb of four larval stages of the ladybird beetle Cheilomenes sexmaculata (Fabricius) (Coleoptera: Coccinellidae) was amputated. Amputated individuals were reared until adulthood, and all developmental transitions were recorded. Regenerated legs in all the treatments were smaller than the controls, which did not experience the amputation, and the regenerative potency of early larval stages was higher than that of late larval stages. Limb regeneration caused delays in post-amputation developmental duration in all the treatments, increasing their total developmental period. The length of the unamputated left foreleg as well as the wing and antenna size were also reduced in regenerated beetles, showing some internal trade-off. However, there were no significant differences observed between regenerated and control adults in their fresh body weight and body size. Thus, limb regeneration depends upon the stage of larval development at which the amputation was performed. Amputation also affects the development of other appendages. The delay in normal beetle development might have been observed because of extra resource requirement, their allocation as well as reprogramming of the expression of some genes during regeneration.  相似文献   

13.
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15.
Length/weight relationships are described for 16 species of tropical freshwater fishes. Two important morphological groups are recognized (flattened and heavy-bodied) along with two species of eel-like fish. Common regression equations are given.  相似文献   

16.
The length weight relationship was determined for Pseudocalanus minutus elongatus, Temora longicornis, Acartia bifilosa, and Acartia longiremis caught in the Pomeranian Bay (Baltic Sea). To determine the weights of the individuals a geometrical method was used and the formula.  相似文献   

17.
钟福生  李友华 《蛇志》2001,13(1):26-29
作者于1994年12月至1995年4月对黑眉锦蛇进行人工越冬试验,试验结果发现黑眉锦蛇冬眠温度为5℃-8℃,高于8℃以上时出现活动;阳光直射可调节蛇洞温度;保持供应饮水在越冬重要;越冬期自然损失率为18.09%,体长并有缩短的现象,体长缩短率为4.55%;冬季仍然出现培皮现象。  相似文献   

18.
Mean body lengths of gray whale calves were found to increase linearly from 4.6 m at birth to 7 m by weaning at six mo. After weaning, rates of length increase diminish, with calves reaching 8 m by one yr of age and 9 m by two yr. Evaluations of the weights of nine gray whales as functions of their measured lengths and girths reduce the emphasis placed on fast-induced seasonal variations in girth by Rice and Wolman (1971). From birth weights of just under one metric ton, calves double their weights by three mo of age and double again by weaning at six mo.  相似文献   

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