Record breeding year for fen raft spiders in the UK

Conservation success story

In a remarkable turn of events, the fen raft spider population in the UK has experienced a record breeding year, thanks to dedicated conservation efforts spearheaded by Chester Zoo. A decade ago, this species was on the brink of extinction, prompting the zoo to release thousands of these unique arachnids back into their natural habitats. Today, the results are evident, with over 10,000 breeding females reported across the country, marking an unprecedented high for this species.

Chester Zoo has expressed its delight at the resurgence of the fen raft spider, stating, “Ten years ago we helped release thousands of giant spiders back into the UK! The Fen Raft Spiders were bred right here at the zoo, and we’re super happy to report there are now more than 10,000 breeding females and they’ve just had the biggest mating season on record!” This success highlights the importance of conservation initiatives in reversing the decline of endangered species.

Unique hunting techniques

Fen raft spiders are semi-aquatic and possess a fascinating ability to run across the surface of water, a skill that aids them in hunting. Unlike many spiders that rely on webs to catch their prey, these spiders actively pursue their food, which includes other spiders, damselflies, dragonfly larvae, and even small fish and tadpoles. Their legs are equipped with tiny hairs that can detect vibrations on the water’s surface, allowing them to swiftly capture unsuspecting prey.

This unique hunting strategy not only showcases their adaptability but also emphasizes their role in maintaining the balance of aquatic ecosystems. By controlling the populations of various insects and small aquatic creatures, fen raft spiders contribute significantly to the health of their environments.

Restoration of habitats

The resurgence of the fen raft spider population is a testament to the successful collaboration between Chester Zoo and the Royal Society for the Protection of Birds (RSPB). Fifteen years ago, the species faced near extinction due to habitat destruction. In response, conservationists began a meticulous breeding program, rearing hundreds of spiderlings in bio-secure facilities. The process involved hand-feeding tiny flies to the young spiders until they were strong enough to be released back into their restored habitats.

Tim Strudwick, site manager at RSPB Mid Yare nature reserves, emphasized the significance of this species, stating, “The Fen Raft Spider is one of the UK’s rarest invertebrates and we are proud of the role our reserves and teams have played in its recovery.” The successful breeding and release of fen raft spiders not only highlights the effectiveness of conservation efforts but also serves as a reminder of the delicate balance within our ecosystems.