📚 A-Level Biology: Prevention and Control Measures for Invasive Alien Species | A-Level 生物：外来物种入侵的防控措施
Invasive alien species (IAS) are among the greatest threats to global biodiversity, second only to habitat destruction. For CIE A-Level Biology, you need to understand how these species are introduced, and critically evaluate the range of strategies available to prevent and control their spread.
外来入侵物种（IAS）是对全球生物多样性的最大威胁之一，其危害仅次于栖息地破坏。在CIE A-Level 生物考试中，你需要理解这些物种是如何被引入的，并能批判性评估预防和控制其扩散的各种策略。
1. What Are Invasive Alien Species? | 什么是外来入侵物种？
An alien (non-native) species is one that has been transported by human activity to a region outside its natural range. An invasive alien species is a non-native species that establishes a population, spreads rapidly, and causes ecological, economic or health harm in its new habitat.
外来（非本地）物种是指通过人类活动被运送到其自然分布范围以外地区的物种。外来入侵物种是指在新生境中建立种群、快速扩散并对生态、经济或人类健康造成危害的非本地物种。
Key terminology you should know: native species are those that occur naturally in a region; non-native species are introduced by humans; and invasive species are a subset of non-native species that actually cause harm. Not every non-native species becomes invasive – the ‘tens rule’ suggests that only about 10% of introduced species become established, and only 10% of those become invasive.
你需要掌握的关键术语：本地物种是自然分布于某一地区的物种；非本地物种是由人类引入的物种；而入侵物种是真正造成危害的那部分非本地物种。并非所有非本地物种都会成为入侵物种——”十分之一法则”指出，约10%的引入物种能建立种群，而这些种群中仅10%会成为入侵物种。
2. Why Do Invasive Species Cause Problems? | 外来入侵物种为何造成危害？
Invasive species harm ecosystems through multiple mechanisms. They compete with native species for food, light and space; they may prey on native organisms; they can introduce new diseases; and they can hybridise with native species, causing genetic pollution.
入侵物种通过多种机制危害生态系统。它们与本地物种竞争食物、光照和空间；可能捕食本地生物；可能引入新的疾病；还可能与本生物种杂交，造成基因污染。
Invasive species often succeed because they lack natural predators, parasites or pathogens in their new habitat. Their population growth rate (r) is high, and they often have broad ecological tolerance and a wide niche. This gives them a competitive advantage over native species that have co-evolved with local predators and diseases.
入侵物种之所以能够成功，往往是因为它们在新生境中缺乏天敌、寄生虫或病原体。它们具有较高的种群增长率（r），通常生态耐受性广、生态位宽。这使它们在与本地物种竞争时占据优势，因为本地物种是与当地捕食者和疾病长期协同进化的。
Economic impacts are also enormous: IAS cost the global economy hundreds of billions of dollars annually in crop losses, control expenses and infrastructure damage. In the UK alone, Japanese knotweed is estimated to cost over £150 million per year to manage.
经济影响同样巨大：外来入侵物种每年因作物减产、防控费用和基础设施损坏，给全球经济造成数千亿美元的损失。仅在英国，日本虎杖每年的治理费用估计就超过1.5亿英镑。
3. Routes of Introduction | 入侵物种的引入途径
Introductions can be deliberate or accidental. Deliberate introductions include plants brought in for horticulture or agriculture (such as Japanese knotweed), animals imported as pets (such as the red-eared slider turtle), and species released as biological control agents that later attack non-target species.
引入可以是故意的，也可以是意外的。故意引入包括为园艺或农业引入的植物（如日本虎杖）、作为宠物进口的动物（如红耳龟），以及后来攻击非靶标物种的、作为生物防治剂释放的物种。
Accidental introductions are equally important. Ballast water taken on board ships in one port and discharged in another transports marine organisms worldwide. Hull fouling carries attached organisms such as barnacles and algae. Contaminated cargo, timber, food and even footwear can also carry seeds, insects and pathogens across borders.
意外引入同样重要。船舶在一个港口装载压舱水，在另一个港口排放，将海洋生物运往世界各地。船体附着物携带藤壶和藻类等附着生物。受污染的货物、木材、食品甚至鞋类都可能将种子、昆虫和病原体带过国境。
4. Prevention: The First Line of Defence | 预防：第一道防线
Prevention is the most cost-effective and environmentally sound strategy. Once an invasive species becomes established, eradication is often difficult or impossible. Customs inspections, quarantine regulations and import bans at national borders form the primary barrier to the entry of new alien species.
预防是最具成本效益且最环保的策略。一旦入侵物种建立种群，根除往往非常困难甚至不可能。海关检查、检疫法规和国家边境的进口禁令构成了阻止新外来物种入境的主要屏障。
Legislation plays a key role. The UK’s Wildlife and Countryside Act 1981 (and the more recent Invasive Alien Species (Enforcement and Permitting) Order 2019, implementing EU Regulation 1143/2014) makes it an offence to release or cause the spread of listed invasive species. Similar laws exist internationally, such as the Convention on Biological Diversity’s Guiding Principles on Invasive Species.
立法起着关键作用。英国1981年《野生动植物及乡村法》（以及最近的2019年《外来入侵物种（执法与许可）条例》，实施欧盟第1143/2014号条例）规定，释放或导致列名入侵物种扩散属于违法行为。国际上也有类似法律，例如《生物多样性公约》关于入侵物种的指导原则。
Prevention also includes risk assessment before any new species is imported. Scientists evaluate the species’ ability to establish, spread and cause harm, its climate compatibility, and the pathways available for introduction. High-risk species are excluded from import.
预防还包括在任何新物种进口前进行风险评估。科学家评估物种建立种群、扩散和造成危害的能力、气候适应性以及可能引入的途径。高风险物种被禁止进口。
5. Early Detection and Rapid Response | 早期监测与快速响应
When prevention fails, early detection is the next best option. A small, localised population is far easier to eradicate than a widespread one. Surveillance programmes monitor high-risk areas such as ports, airports, nature reserves and river systems for signs of new arrivals.
当预防失效时，早期监测是次优选择。一个小的、局部的种群远比广泛分布的种群更容易根除。监测计划在港口、机场、自然保护区和河流系统等高危区域巡查，寻找新物种出现的迹象。
Citizen science contributes significantly: apps and websites allow members of the public to report sightings of suspected invasive species, which are then verified and investigated. Once a new invasion is confirmed, rapid response teams deploy immediately, using whatever combination of methods is available to remove the population before it establishes.
公众科学贡献很大：应用程序和网站允许公众报告疑似入侵物种的目击情况，随后由专业人员核实和调查。一旦确认新的入侵，快速响应小组会立即出动，在种群建立之前，采用一切可用的方法组合将其清除。
6. Physical Control | 物理防控
Physical (mechanical) control involves the direct removal or exclusion of invasive species. Techniques include hand-pulling or digging up plants, mowing or cutting, trapping or shooting animals, applying physical barriers (such as fences), dredging waterways, and burning.
物理（机械）防控是指直接清除或隔离入侵物种。技术包括徒手拔除或挖掘植物、割草或砍伐、诱捕或射杀动物、设置物理屏障（如围栏）、疏浚水道以及焚烧。
Physical control has several advantages: it avoids chemical pollution, is selective (targeted at the invasive species) and is suitable for small or early-stage invasions. However, it is labour-intensive and expensive for large areas, and some methods may damage the habitat or disturb non-target species.
物理防控有几个优点：避免化学污染，具有选择性（针对入侵物种），适合小规模或早期入侵。然而，在大范围内劳动强度和成本很高，且某些方法可能破坏栖息地或干扰非靶标物种。
For example, the invasive water hyacinth (Eichhornia crassipes) can be removed by mechanical harvesters, but this is slow and must be repeated several times each year because the plant regrows from small fragments. A single plant can produce thousands of seeds that remain viable for up to 20 years, so physical removal alone rarely achieves long-term control.
例如，入侵的水葫芦（凤眼蓝）可以用机械收割机清除，但这种方法速度慢，且因植物从小碎片即可再生，每年必须重复数次。一株植物可产生数千粒种子，存活期长达20年，因此仅靠物理清除很难实现长期控制。
7. Chemical Control | 化学防控
Chemical control uses herbicides (for plants) and pesticides or biocides (for animals) to kill invasive species. It can be applied with precision using spot spraying, stem injection, bait stations or fumigation, making it useful for inaccessible areas or when rapid action is needed.
化学防控使用除草剂（针对植物）和杀虫剂或生物杀灭剂（针对动物）来杀灭入侵物种。可以采用点喷、茎干注射、诱饵站或熏蒸等方式精确施用
Published by TutorHao | A-Level Biology Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
屏轩国际教育cambridge primary/secondary checkpoint, cat4, ukiset,ukcat,igcse,alevel,PAT,STEP,MAT, ibdp,ap,ssat,sat,sat2课程辅导，国外大学本科硕士研究生博士课程论文辅导