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Natural Perspectives:

The state of the Bolsa Chica Wetlands

September 11, 2008|By Vic Leipzig and Lou Murray

Last week, the Amigos de Bolsa Chica hosted a town hall meeting at the Wetlands and Wildlife Care Center at Newland and Pacific Coast Highway. Attended by an overflow crowd, the mini-symposium covered the two years of changes that have occurred in the water, plants, fish and birds at Bolsa Chica since the opening of the ocean inlet in August 2006. Vic was the moderator. I sat in the audience and took notes, an easier task.

Some of the many interesting things we heard at the meeting were about sharks, stingrays and guitarfish. Christopher Lowe of Cal State Long Beach reported there are about 1,500 stings per year from stingrays in the United States. Seal Beach gets the lion’s share of those encounters, with 200 to 400 stings noted per year, mostly from June through August. The worst place is right at the mouth of the San Gabriel River, where the water is the warmest. When swimmers accidentally step on them, the stingrays whip their tails up, stinging hapless swimmers on their feet and ankles.

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Lowe’s mark and recapture studies of tagged stingrays indicate there are about 16,000 stingrays hanging just off the coast at Seal Beach. No wonder so many people get stung. However, any individual ray generally only stays there for one to three days. Then it takes off. Turns out that one of the places where they may be going is the newly restored full tidal basin at Bolsa Chica. The attraction of this new bay may pull some of the summer stingrays from Seal Beach, lessening the impact of swimmers being stung.

Lowe’s graduate student, Thomas Farrugia, spoke about the studies he conducted with another of Lowe’s graduate students, Mario Espinoza, a Fulbright Scholar from Costa Rica. They tracked movements of shovelnose guitarfish, leopard sharks and gray smoothhound sharks at Bolsa Chica. These bottom-dwelling elasmobranchs (cartilaginous fishes) are the top underwater predators at the Bolsa Chica. Farrugia and Espinoza were pleased to find a wide range of sizes of these fish at Bolsa Chica, which suggests the bay may be serving as a nursery for small shark species.

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