Feeding ecology and diet

Rotifers typically feed on suspended organic particles, mi-croalgae, ciliates, or bacteria. Most rotifers are filter feeders

Light micrograph of the Antarctic species Philodina gregaria. This red colored rotifer survives the winter in cyst form and hatches out when pools and lakes of meltwater form during the austral summer. It reproduces in vast numbers, sometimes coloring the floor of the lake red. (Photo by ©John Walsh/Science Photo Library/Photo Researchers, Inc. Reproduced by permission.)

or suspension feeders and collect food with a water current created by the ciliary beat of the corona. There also are several forms of specialization. Instead of filtering, some rotifers creep along plants or sediment particles and graze on the bacterial layer. Others are predatory and may feed on algae, flagellates, or even other rotifers. In the latter case, it often is possible to identify the ingested prey by analyzing its indigestible trophi in the predator's stomach contents. Species that feed on algae often employ their unci to penetrate the filament, consequently using the large hypopharyngeal muscles to create a vacuum and in this way suck out the cytoplasm of the prey.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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