How changes in Knysna Estuary habitat put endangered seahorse under pressure 

By Clement Arendse 

At first glance, the Knysna Estuary presents a picture of calm. Its surface gives little away. It is easy to assume that what lies beneath is equally steady, quietly unchanged. 

But recent dives by SANParks staff suggest a different reality. The estuary is not simply a habitat. It is a system in motion, shaped by subtle shifts that are easy to miss unless one is willing to look closely and repeatedly.

Our work began with a focused question. What does the endangered Knysna seahorse eat, and how available is that food across the estuaries it inhabits? The answer, it turns out, is tied to a much larger story. 

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These seahorses rely on tiny invertebrates that live within underwater vegetation such as Cape eelgrass.

To study them, divers collected samples directly from these habitats, bringing back not only