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首页> 外文期刊>Conservation Biology >Conservation of species in dynamic landscapes: Divergent fates of Silene tatarica populations in riparian habitats
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Conservation of species in dynamic landscapes: Divergent fates of Silene tatarica populations in riparian habitats

机译：保护动态景观中的物种：河岸生境中Sil柳种群的不同命运

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In transient environments, where local extinctions occur as a result of destruction or deterioration of the local habitat, the long-term Persistence of a species requires successful colonizations at new, suitable sites. This kind of habitat tracking should be associated with the asynchronous dynamics of local populations, and it can be especially important for the conservation of rare plant species in riparian habitats. We determined spatiotemporal variation in the demography of the perennial Silene tatarica (L.) Pers. in 15 populations (1998-2003) located in periodically disturbed riparian habitats. The habitats differed according to their morphology (flat shores, slopes) and the amount of bare ground (open, intermediate, closed) along a successional gradient. We used elasticity and life-table response analyses and stochastic simulations to study the variation in population demography. Finite population growth rate was higher in intermediate habitats than in open and closed habitats. In stochastic simulations population size increased in most cases, but four populations were projected to become extinct within 12-70 years. The viability of local populations depended most on the survival and growth of juvenile individuals and on the fecundity of large fertile individuals. On a regional scale, the persistence of this species will require a viable network of local populations as protection against local extinctions caused by natural disturbances and succession. Accordingly, the long-term persistence of riparian species may depend on habitat changes; thus, their conservation requires maintenance of natural disturbance dynamics. Along regulated rivers, management activities such as the creation of open habitats for new colonization should be implemented. Similarly, these activities can be rather general requirements for the conservation of endangered species dependent on transient habitats along successional gradients.
机译：在短暂的环境中，由于当地栖息地的破坏或恶化而导致局部灭绝，物种的长期生存需要在新的合适地点成功定居。这种栖息地跟踪应与当地种群的异步动态相关联，并且对于保护河岸栖息地中的稀有植物物种可能尤其重要。我们确定了多年生Sileta tatarica（L.）Pers的人口统计资料的时空变化。分布在周期性扰动的河岸生境中的15个人口（1998-2003年）中。生境根据其形态（平坦的海岸，斜坡）和沿连续梯度的裸露地面（开放，中间，封闭）的数量而有所不同。我们使用了弹性和生命表响应分析以及随机模拟来研究人口统计学的变化。中间栖息地的有限种群增长率高于开放和封闭栖息地。在随机模拟中，大多数情况下种群数量会增加，但预计有四个种群在12-70年内将灭绝。当地人口的生存能力在很大程度上取决于未成年个体的生存和成长以及大型可育个体的繁殖力。在区域范围内，该物种的持续生存将需要一个可行的当地种群网络，以保护其免受自然干扰和演替造成的物种灭绝。因此，河岸物种的长期持久性可能取决于栖息地的变化。因此，它们的保存需要保持自然干扰动态。沿着受管制的河流，应开展管理活动，例如为新的殖民地创造开放的栖息地。同样，这些活动可能是对依赖于沿演替梯度的过渡生境的濒危物种进行保护的一般要求。

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