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首页> 外文期刊>Herpetologica >Life-history traits of Plethodon cinereus in the northern parts of its range: Variations in population structure, age and growth
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Life-history traits of Plethodon cinereus in the northern parts of its range: Variations in population structure, age and growth

机译：北部斑节菜的生活史特征：种群结构，年龄和增长的变化

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The life history of red-backed salamanders (Plethodon cinereus) has been intensively studied in the United States, but little information exists for Canadian populations, which limits the ability to perform analyses of latitudinal trends in this species. To investigate variations in body size, age structures, longevity, and growth, we used drift fences to sample populations in four habitats (from mixed to deciduous forests) Within a 12 km radius in the Mastigouche Reserve located in Quebec, Canada. During the active season of 1997, we captured, measured and sexed (except neonates) a total of 775 salamanders, and estimated the age of 330 of these specimens using skeletochronology. The population characterized by highest mean body size and/or mean age was from a mixed forest that also harbored the greatest abundance of salamanders. For all populations combined, body size (SVL) ranged from 12-46 mm for males and 12-54 mm for females, and longevity reached 8 yr in females and 9 yr in males. Adult males showed lower mean SVL and mean age than adult females (41.0 mm, 5.2 yr vs. 44.8 mm, 5.8 yr, respectively). Accordingly, von Bertalanffy growth models indicated a higher asymptotic body size and a lower growth coefficient in females. For 7 out of 8 analyses, age was significantly correlated with SVL in animals >= 4 yr old; the strength of these correlations was greater in females than in males and significantly correlated with SVL range. Comparisons with other populations reveal that age and size at maturity in P. cinereus increase with latitudes in both sexes. However, females, but not males, show a slight increase in mean adult body size with latitudes, leading to a positive allometric relationship between body size and sexual size dimorphism, the northern populations being more dimorphic. Body increment during the first year of growth was found similar to lowest values reported for other small species of Plethodon from the United States but much reduced compared to conspecific populations from the U.S.A. Factors related to latitude (e.g., temperature, duration of activity season) seem responsible for the observed differences.
机译：在美国，对红背sal（Plethodon cinereus）的生活史进行了深入研究，但加拿大种群的信息很少，这限制了对该物种进行纬向趋势分析的能力。为了研究人体大小，年龄结构，寿命和生长的变化，我们使用漂移栅栏对位于加拿大魁北克省Mastigouche保护区12公里半径内四个生境（从混合森林到落叶森林）的种群进行采样。在1997年的活动季节中，我们捕获，测量和定性了（新生儿除外）775个sal，并使用骨骼年代学方法估计了330个330的年龄。以最高平均体重和/或平均年龄为特征的种群来自混交林，其中也有最多的sal。在所有人群中，男性的体型（SVL）在12-46毫米之间，女性在12-54毫米之间，女性的寿命达到8岁，男性达到9岁。成年男性的平均SVL和平均年龄均低于成年女性（分别为41.0 mm，5.2岁和44.8 mm，5.8岁）。因此，冯·贝塔兰菲（von Bertalanffy）的生长模型表明女性的渐近体形较高，而生长系数较低。在八分之七的分析中，年龄大于等于4岁的动物的年龄与SVL显着相关。这些相关的强度在女性中比在男性中更大，并且与SVL范围显着相关。与其他种群的比较显示，灰松运动成虫的年龄和大小随性别的增加而增加。然而，随着纬度的变化，女性（而非男性）的平均成年体型略有增加，导致体型和性别双态性之间呈正向异形关系，而北方人群则更为双态。发现生长的第一年中的身体增加与美国其他种类的Plethodon小物种的最低值相似，但与美国的同种种群相比却大大降低了。与纬度相关的因素（例如温度，活动季节的持续时间）似乎对观察到的差异负责。

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