The benthos of a perennially ice-covered Antarctic lake, Lake Hoare, contained three distinct ‘signatures’ of lipophilic pigments. Cyanobacterial mats found in the moat at the periphery of the lake were dominated by the carotenoid myxoxanthophyll; carotenoids: chlorophyll a ratios in this high light environment ranged from 3 to 6.8. Chlorophyll c and fucoxanthin, pigments typical of golden-brown algae, were found at 10 to 20 m depths where the benthos is aerobic. Anaerobic benthic sediments at 20 to 30 m depths were characterized by a third pigment signature dominated by a carotenoid, tentatively identified as alloxanthin from planktonic cryptomonads, and by phaeophytin b from senescent green algae. Pigments were not found associated with alternating organic and sediment layers. As microzooplankton grazers are absent from this closed system and transformation rates are reduced at low temperatures, the benthos beneath the lake ice appears to contain a record of past phytoplankton blooms undergoing decay.

中文翻译：

---

来自常年冰雪覆盖的南极湖底栖生物的亲脂性色素

常年被冰覆盖的南极湖霍尔湖的底栖动物含有三种不同的亲脂色素“特征”。在湖外围护城河中发现的蓝藻垫以类胡萝卜素粘黄素为主；类胡萝卜素：在这种强光环境中，叶绿素 a 的比率范围为 3 到 6.8。叶绿素 c 和岩藻黄质是金棕色藻类的典型色素，在底栖生物需氧的 10 至 20 m 深处发现。20 至 30 m 深度的厌氧底栖沉积物的特征是第三种色素特征由类胡萝卜素主导，初步鉴定为来自浮游隐藻的异黄质和来自衰老绿藻的褐藻素 b。没有发现颜料与交替的有机层和沉积层有关。