MATS OF WATER PLANTS
By August, varying-sized, green mats of algae, duckweed and water stargrass float together on the surfaces of certain ponds and still backwaters of creeks in Lancaster County, Pennsylvania. Algae grows in long, matted strands, and duckweeds are tiny, flat plants that grow in colonies on water surfaces. Stargrass colonies root in muddy bottoms. Each plant's long leaves undulate in currents and the single yellow flower barely emerges from the water's surface to be pollinated. Together, those mats of algae, duckweed, and stargrass in bloom, look like tiny islands in the water, and remind me of lawns with dandelion flowers flourishing in them. And, those mats of small, aquatic plants create niches that several kinds of small creatures use for a variety of reasons. Certain kinds of attractive and entertaining damselflies and dragonflies rest on those mats, after aerial feeding forays on small, flying in...