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Planning a red squirrel conservation area: using a spatially explicit population dynamics model to predict the impact of felling and forest design plans

机译：规划红松鼠保护区：使用空间明确的种群动态模型预测伐木和森林设计计划的影响

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This paper describes the use of a spatially explicit population model (SEPM) to investigate the effects of different forest management strategies on a red squirrel conservation area. The study was based in woodland managed by Forest Enterprise, which manages 75 000 ha of woodlands in Northumberland, Co. Durham, Tyne and Wear, and east Cumbria. The forests contain the largest remaining red squirrel populations in northern England and the area of the study, Kidland Forest, is one of five key areas or refuges where red squirrel conservation is a priority. The SEPM integrates expert knowledge on red and grey squirrels, based on 10 years of fieldwork in the area and information from the scientific literature. We investigated the current tree species composition, distribution and proposed felling plans as well as the future restocking for Kidland Forest, an area of 2050 ha of predominantly conifer species. The assessment also included a proposed planting of 15 ha of oak and its likely consequences on grey squirrel population viability. These results were then applied to develop a forest design plan to ensure red squirrel persistence over the next rotation. Results indicated that red squirrels were at risk of extinction due to a drastic reduction in the availability of suitable habitats through clear-felling. Furthermore the proposed planting of 15 ha of oak could lead to a substantial grey squirrel population at Kidland once the trees matured and assuming that grey squirrels colonize the area. The felling profile was therefore revised, allocating a proportion of the tree crop on more wind-firm sites to long-term retentions. The approach adopted at Kidland illustrates how geographical information systems, expert knowledge on the threatened species and spatially explicit models can be integrated to assist forest managers in assessing the suitability of a site for red squirrel conservation.
机译：本文介绍了使用空间显性种群模型（SEPM）来研究不同森林管理策略对红松鼠保护区的影响。这项研究基于由Forest Enterprise管理的林地，该企业管理着Northumberland，Durham，Tyne and Wear和东部Cumbria的75,000公顷林地。森林中英格兰北部剩余的红松鼠数量最多，研究区域Kidland Forest是优先考虑保存红松鼠的五个关键区域或避难所之一。 SEPM基于对该地区10年的实地考察以及科学文献的信息，整合了红松鼠和灰松鼠的专业知识。我们调查了目前的树种组成，分布和拟议的砍伐计划，以及未来对基德兰森林的补给，基德兰森林占2050公顷，主要为针叶树种。评估还包括提议种植15公顷的橡树及其对灰松鼠种群生存能力的可能影响。然后将这些结果应用于制定森林设计计划，以确保在下一个轮作中红松鼠的持久性。结果表明，红松鼠有灭绝的危险，这是由于通过砍伐明显减少了合适生境的可利用性。此外，一旦树木成熟并假定灰松鼠在该地区定居，建议种植15公顷的橡木可能会在Kidland导致大量灰松鼠种群。因此，对采伐情况进行了修订，将更多风果园地点的部分树木作物分配给长期保留。 Kidland采用的方法说明了如何整合地理信息系统，有关受威胁物种的专家知识以及空间明晰的模型，以帮助森林管理者评估红松鼠保护区的适宜性。

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