Habitat conservation can revitalize once-depleted marine ecosystems

A new research has indicated that habitat conservation can revitalize once-depleted marine ecosystems.

If reports are anything to go by, the marine ecosystems of the Gulf of California are under threat, with destructive new fishing methods depleting the sea's habitats, creating areas that are ghosts of their former existences.

But, according to Octavio Aburto-Oropeza of Scripps Institution of Oceanography at UC San Diego, habitat conservation can revitalize once-depleted marine ecosystems.

One recently emerging threat is a highly destructive fishing method called "hookah" diving in which fishermen use crude oxygen piping to walk along the seafloor for long periods.

The technique is typically conducted at night when fish are resting, allowing the hookah fishermen to spear or grab large numbers of vulnerable fish and invertebrates.

Aburto-Oropeza's findings on reversing the effects of such threats are part of a series of research studies headed by the newly launched Gulf of California Program based at Scripps Oceanography.

"In these studies, whether reefs or mangroves, we are trying to show that the destruction on the coast and overexploitation in other areas are diminishing the biomass (the amount of organisms in an ecosystem) in several areas," said Aburto-Oropeza.

"With lower biomass, the large predators, the keys to a robust marine ecosystem, are missing and that causes disruption down the marine food web," he said.

But there is hope to counteract such damage, according to Aburto-Oropeza.

One successful example is Cabo Pulmo, a little-known protected area near the southern tip of the Baja peninsula that is thriving and a living example of the benefits of protected marine areas.

Restricted of fishing since 1995, Cabo Pulmo features a robust mix of sea life and flourishing fish populations.

Other successes include Coronado Island inside the Loreto marine park and Los Islotes inside Espiritu Santo marine park.

"Different sites recover in different ways, but they all have increased in biomass, especially top predators," said Aburto-Oropeza.

"The common thing is that they have reduced or eliminated fishing activity," he added.