Will they be back? A framework to guide rare macrophyte conservation decisions in lakes
Will they be back? A framework to guide rare macrophyte conservation decisions in lakes
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DOI：
10.1111/rec.14026
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发表时间：
2023-09
影响因子：
3.2
通讯作者：
H. Bennion;C. Sayer;Ambroise Baker;Isabel J. Bishop;Azra Glover;Viv Jones;Alan Law;Genevieve Madgwick;S. Peglar;Carole Roberts;Neil Rose;Simon Turner;N. Willby;Handong Yang
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文献类型：
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作者：
H. Bennion;C. Sayer;Ambroise Baker;Isabel J. Bishop;Azra Glover;Viv Jones;Alan Law;Genevieve Madgwick;S. Peglar;Carole Roberts;Neil Rose;Simon Turner;N. Willby;Handong Yang
浅水湖的恢复主要集中在重建大型植物上。物种返回某一地点的可能性取决于扩散、接近繁殖源和现场繁殖库的生存能力。我们结合植物学调查和分布图，探索古生态记录的潜力，以确定从两个湖泊(坎布里亚州的巴顿布罗德、诺福克和埃斯韦特水)和一个湖泊景观(苏格兰的大格拉斯哥)中分别损失了三种沉水植物(Littorella uniflora、Najas Flilis和Elatine Hypiper)。我们讨论了在考虑物种自身生态和当前水化学条件时重建的可能性。Uniflora在英国广泛分布，但在诺福克当地没有已知的种子库，因此不太可能自然地重新定居巴顿·布罗德。此外，目前的条件不适合该物种，这表明在转移之前需要减少营养物质。N.Flexilis在坎布里亚已经灭绝，而Esthwaite Water重新定居所涉及的长距离(>；100公里)表明空间扩散是不太可能的，使种子库成为自然恢复的最后机会。或者，易位可能是可行的。水笛鱼在英国是国家稀有物种，但只有很短的扩散距离(~10公里)才能重新定居利波湖，因此不需要移居。在探索三个重点植物物种的恢复可能性时，我们开发了一个时空综合框架，可以用来指导其他物种的保护决定，使未来能够更合理地利用易位，符合国际准则。
Shallow lake restoration typically focusses on the re‐establishment of macrophytes. The likelihood of a species returning to a site is contingent on dispersal, proximity to propagule sources, and the on‐site propagule‐bank viability. We explore the potential of palaeoecological records in combination with botanical surveys and distribution maps, to ascertain the loss of three submerged macrophytes (Littorella uniflora, Najas flexilis, and Elatine hydropiper) from, respectively, two lakes (Barton Broad, Norfolk and Esthwaite Water, Cumbria) and one lake landscape (Greater Glasgow, Scotland). We discuss re‐establishment likelihood when accounting for species' autoecology and current water‐chemistry conditions. L. uniflora is widespread in the United Kingdom but absent locally in Norfolk without known seed bank, hence is unlikely to naturally recolonise Barton Broad. Furthermore, current conditions are unsuitable for this species suggesting that nutrient reduction is required prior to translocation. N. flexilis is extinct in Cumbria and the long distances involved (>100 km) for recolonisation of Esthwaite Water suggest that spatial dispersal is unlikely, rendering the seed bank the last chance of natural recovery. Alternatively, translocation may be feasible. E. hydropiper is a nationally scarce species in the United Kingdom yet would have only a short dispersal distance (~10 km) to recolonise Loch Libo, hence there being no requirement for translocation. In exploring the recovery possibilities for the three focal plant species, we develop a time–space integrated framework that can be employed to guide conservation decisions for other species, enabling a more rational use of translocations in the future, in line with international guidelines.