Microcosm experiments were conducted to study the relative survival of two Escherichia coli strains in the Kongsfjorden water during 2017 Arctic summer. One of the E. coli strain was from the migratory bird Branta leucopis (Barnacle goose), to represent the allochthonous E. coli from migratory bird community, and the other strain was from the reindeer (Rangifer tarandus), which is a native animal. We observed that both B. leucopis and R. tarandus feed on the tundra and the faecal indicator bacteria (E. coli) in the faecal entrapments find their way to the Kongsfjorden along with the melt water from tundra during the Arctic summer. Survival is evaluated in terms of the self-contained biotic factors in the fjord water, chemical composition of the fjord water and solar radiation impinging on the water during Arctic summer. Results revealed that biotic factors and solar radiation were most effective in the removal of E. coli from the Kongsfjorden water, while chemical composition of the fjord water supported extended survival of E. coli. T₉₀ (time required for the removal of 90% of the cells) was reached in less than 24 h in the test solutions to study the effect of biotic factors while T₉₀ as a function of sunlight and chemical composition of fjord water reached in less than 2 days. No significant difference (p > 0.05) in the survival of E. coli from the autochthonous and allochthonous sources. Studies on survival of mesophilic intruders should be carried out for a systematic risk assessment of microbial contamination.

进行了微观世界实验以研究2017 年北极夏季 Kongsfjorden 水域中两种大肠杆菌菌株的相对存活率。其中一个的大肠杆菌菌株是从候鸟黑雁leucopis（藤壶鹅），以表示外来的大肠杆菌从候鸟界和其他菌株是从驯鹿（驯鹿），它是天然的动物。我们观察到B. leucopis和R. tarandus 都以苔原和粪便指示菌（大肠杆菌）为食) 在北极夏季，粪便中的残留物会与来自苔原的融水一起到达 Kongsfjorden。生存是根据峡湾水中自给自足的生物因素、峡湾水的化学成分和北极夏季照射在水面上的太阳辐射来评估的。结果表明，生物因素和太阳辐射对从 Kongsfjorden 水中去除大肠杆菌最有效，而峡湾水的化学成分支持大肠杆菌的延长存活。在测试溶液中不到 24 小时就达到了T ₉₀（去除 90% 细胞所需的时间）以研究生物因素的影响，而 T ₉₀根据阳光和峡湾水的化学成分，不到 2 天就达到了。来自本地和异地来源的大肠杆菌的存活率没有显着差异（p > 0.05）。应该对嗜温入侵者的存活情况进行研究，以对微生物污染进行系统的风险评估。