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Fun Science FRIEDay – Underwater World of Pollination

Posted on October 14, 2016 By Kersey Sturdivant
Science

Pollination. I think most people understand why this is important (or maybe I should say, I hope). To put it simply, the process of pollination facilitates reproduction in plants by transferring pollen from one plant to another. In the terrestrial world, this can be mediated by physical forcing (e.g., wind) or by animals (e.g., insects) – and its why people are freaking out about the loss of bees due to pesticides (because they are a primary pollinator), but I digress. Until relatively recently, pollination by animals was not thought to occur in the ocean. Unlike on land, where most flowering plants rely on creatures to carry pollen, plant reproduction in an aquatic world was surmised to rely exclusively on currents and tides. However, a team of researchers led by marine biologist Brigitta van Tussenbroek revoked the long standing paradigm that pollen in the sea is transported only by water, discovering and documenting the process of zoobenthophilous pollination (a term they coined).

Gamarid amphipod feeding on pollen or mucilage of a male flower of the seagrass Thalassia testudinum at night. (Photo credit: Tussenbroek et al. 2012)
Gamarid amphipod feeding on pollen of a male
flower of the seagrass Thalassia testudinum at night. (Photo credit: Tussenbroek et al. 2012)

These researchers from the National Autonomous University of Mexico observed that tiny crustaceans visiting seagrass beds were covered in grains of pollens. It seemed to van Tussenbroek and her team as if these organisms were most certainly pollinators, but the researchers did not have any definitive proof. As good scientists do, they put their hypothesis to the test. They developed a series of mesocosm based experiments in aquaria, and determined that in the complete absence of current, seagrass flowered only when visited by by crustaceans, i.e., underwater animal pollination!

(a) Majid zoea larva (stage I) with a pollen grain in digestive tract (detail was obtained with different illumination). (b) Thallasinidea zoea (stage I) with a pollen grain near rostrum and antenna. (c) Brachyuran zoea (stage I) with a pollen grain attached to abdomen. (d) Young Syllid polychaete with two pollen grains attached to segments; the almost hidden second grain is indicated by arrow. The pollen grains are indicated by circles. The bars represent mm. (Photo credit: Tussenbroek et al. 2016)
(a) Majid zoea with a pollen grain in digestive tract. (b) Thallasinidea zoea with a pollen grain near rostrum and antenna. (c) Brachyuran zoea with a pollen grain attached to abdomen. (d) Young Syllid polychaete with two pollen grains attached to segments; the almost hidden second grain is indicated by arrow. The pollen grains are indicated by circles. The bars represent mm. (Photo credit: Tussenbroek et al. 2016)

There are a number of practical implications for their findings. Seagrass meadows are foundational to many coastal habitats and are amongst the world’s most productive ecosystems. Seagrass provides a number of ecosystem services such as improved water clarity, stabilization of the coastline, sequestration of carbon, and a facilitator of marine diversity. These findings by van Tussenbroek and her team demonstrate that despite how much we may know, there are still many more wonders and mysteries to elucidate about the natural world!

You can read more about this awesome study which was recently published in the journal Nature.

 

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Tags: crustaceans invertebrates macrofauna pollen pollination pollinators seagrass zoobenthophilous

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