Sensitivity Maps — Maps Natural Regions — Sympetrum_depressiusculum (Depressed Sympétrum)

Sensitivity maps made by the ODONAT Grand Est network in 2018-2019. The distribution of the species is represented from recent occurrence data (1999-2018 or 2009-2018 by species). These are natural areas in which at least one observation of the species has been carried out in the recent period, as well as natural regions where the species is highly suspected (i.e. experts) or has older data. In each of the natural regions with recent non-marginal observations, this presence is represented by the calculation of the proportion of 1 x 1 km meshes in which the species was observed. For an explanation of the method of calculation, refer to the Natural Regions Map Explanation Sheet. Natural regions identify areas in which abiotic conditions (relief, geology, climate...) are relatively homogeneous. In fact, the observation of a species in a natural region (even at a single location) provides a strong presumption of other favourable habitats elsewhere in the natural region. Any observations shall be taken into account: they can be implanted populations, but also erratic individuals. This layer represents the state of knowledge at the time of its realisation, it should not be considered exhaustive. The presence of the species outside the identified areas is possible. Refer to the card reading instructions as well as PDF cards for more information.2018-2019年由ODONAT大东部地区网络（ODONAT Grand Est）制作的敏感性分布图（sensitivity maps）。 本数据集基于最新的物种出现记录（针对不同物种，时间范围为1999-2018年或2009-2018年）来呈现物种分布情况。 此类区域包含两类：一是近期内至少记录到该物种观测的自然区域（natural region）；二是经专家高度推定存在该物种，或拥有较老观测数据的自然区域。对于拥有近期有效观测记录的自然区域，我们通过计算该区域内观测到该物种的1×1千米网格（1 x 1 km meshes）占比，来表征物种在此区域的分布情况。若需了解计算方法详情，请参阅《自然区域地图说明手册》（Natural Regions Map Explanation Sheet）。 自然区域指非生物环境（abiotic conditions，包括地形、地质、气候等）相对均一的区域。 事实上，只要在某自然区域内有过一次物种观测记录（哪怕仅单个点位），即可有力推定该区域内其他位置也存在适宜该物种生存的栖息地。 所有观测记录均纳入考量范围：既包括人工定植种群（implanted populations），也包括偶见个体（erratic individuals）。 本图层仅反映制作完成时的认知水平，不应被视为全面完整的数据集。该物种有可能出现在本数据集划定范围之外的区域。 如需获取更多信息，请参阅卡片阅读指南及相关PDF说明卡片。