VOLVOX BARBERI, THE FASTEST SWIMMER OF THE VOLVOCALES (CHLOROPHYCEAE)
VOLVOX BARBERI, THE FASTEST SWIMMER OF THE VOLVOCALES (CHLOROPHYCEAE)
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DOI：
10.1111/j.1529-8817.2008.00603.x
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发表时间：
2008-12-01
影响因子：
2.9
通讯作者：
Goldstein, Raymond E.
中科院分区：
文献类型：
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作者：
Solari, Cristian A.;Michod, Richard E.;Goldstein, Raymond E.
团藻Shaw是一种由双鞭毛细胞组成的团藻型绿色藻。团藻目（Vovocales）有16个细胞或更多细胞，形成球形菌落，其最大的成员具有生殖体分离（团藻属的所有物种）。巴氏团藻（V. barberi）是团藻中细胞数量最多的物种（10，000 - 50，000个细胞），体细胞与生殖细胞的比例（S/R）最高。由于它们是负浮力的，团藻目需要鞭毛跳动以避免下沉并获得光线和营养。测定了巴氏弧菌的游动速度和总游动力。巴氏弧菌的游动速度是迄今为止记录的最高的volvocine藻类（类似于600 μ m）。s（-1））。在这种速度下，巴氏弧菌菌落有可能以2-3米的速度在水柱中进行每日垂直迁移。h（-1），与野生团藻种群的报道一致。此外，V. barberi的数据与其他较小团藻物种的比例关系拟合良好，即向上游泳速度V（up）与N（0.28）成正比，总游泳力F（S）与N（0.77）成正比（N =菌落细胞数）。这些异速生长关系是重要的支持证据，可以得出这样的结论，即随着大小的增加，菌落必须投资于细胞特化，并增加它们的S/R，以增加它们的运动能力，以保持漂浮和运动。
Volvox barberi W. Shaw is a volvocalean green alga composed of biflagellated cells. Vovocales with 16 cells or more form spherical colonies, and their largest members have germ-soma separation (all species in the genus Volvox). V. barberi is the largest Volvox species recorded in terms of cell number (10,000-50,000 cells) and has the highest somatic to reproductive cell ratio (S/R). Since they are negatively buoyant, Volvocales need flagellar beating to avoid sinking and to reach light and nutrients. We measured V. barberi swimming speed and total swimming force. V. barberi swimming speeds are the highest recorded so far for volvocine algae (similar to 600 mu m . s(-1)). With this speed, V. barberi colonies have the potential to perform daily vertical migrations in the water column at speeds of 2-3 m . h(-1), consistent with what has been reported about Volvox populations in the wild. Moreover, V. barberi data fit well in the scaling relationships derived with the other smaller Volvox species, namely, that the upward swimming speed V(up) proportional to N (0.28) and the total swimming force F(S) proportional to N (0.77) (N = colony cell number). These allometric relationships have been important supporting evidence for reaching the conclusion that as size increases, colonies have to invest in cell specialization and increase their S/R to increase their motility capabilities to stay afloat and motile.