What occurs when large numbers of filaments from filamentous algae are intertwined?

When large numbers of filaments from filamentous algae intertwine, they create mats at the bottom or surface of bodies of water. This phenomenon occurs because the filaments of algae can become densely packed and entangled, resulting in a thick, cohesive mass. These mats can affect water quality and light penetration, hinder oxygen exchange, and disrupt aquatic ecosystems.

The formation of these mats is significant in aquatic environments, as they can serve as a substrate for other organisms but can also create challenges for water management and recreational use. Such mats can impede water flow and can be harmful in excess, leading to problems like oxygen depletion when they die off and decompose. Understanding this characteristic of filamentous algae helps highlight their influence on aquatic habitats and ecosystem dynamics.