Featured Research

from universities, journals, and other organizations

Damage to threatened Gulf of California habitats can be reversed

Date:
February 22, 2010
Source:
University of California - San Diego
Summary:
Once described by Jacques Cousteau as the "world's aquarium," the marine ecosystems of the Gulf of California are under threat. Destructive new fishing methods are depleting the sea's habitats, creating areas that are ghosts of their former existences.

More than 20 different groups of high-value commercial species, including invertebrates such as blue crabs and fish such as snappers, grunts and snooks, are part of the mangrove forests of the Gulf of California, including this forest off Dazante Island inside the Loreto marine protected area.
Credit: Scripps Institution of Oceanography, UC San Diego

Once described by Jacques Cousteau as the "world's aquarium," the marine ecosystems of the Gulf of California are under threat. Destructive new fishing methods are depleting the sea's habitats, creating areas that are ghosts of their former existences (see Scripps explorations story "Threatened Gulf."

But, as Octavio Aburto-Oropeza of Scripps Institution of Oceanography at UC San Diego described during a presentation at the 2010 American Association for the Advancement of Science (AAAS) annual meeting in 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."

But there is hope to counteract such damage, says 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."

Beyond simply shielding certain locations, Aburto-Oropeza's presentation will cover new research that reveals the strategic importance of protecting areas that are key for fish species populations. In particular, these include important sites such as fish "spawning aggregation" areas, where fish converge in large numbers to reproduce at select times of the year, and sensitive nursery habitats that are vital to ensuring healthy ecosystems.

"For some species these spawning aggregation events occur two to four times per year, and can represent 100 percent of the replenishment of their populations," said Aburto-Oropeza.

Aburto-Oropeza and others recently calculated the economic value of mangroves at roughly $37,500 per hectare per year. An ongoing study has shown that a fish species called gulf corvina provided 3,500 tons of landings in 2009 in one community, a volume worth $3 million.

These studies have been supported by the David and Lucile Packard Foundation, Walton Family Foundation, Pew Foundation, International Community Foundation and Fondo Mexicano para la Conservaciσn de la Naturaleza.


Story Source:

The above story is based on materials provided by University of California - San Diego. Note: Materials may be edited for content and length.


Cite This Page:

University of California - San Diego. "Damage to threatened Gulf of California habitats can be reversed." ScienceDaily. ScienceDaily, 22 February 2010. <www.sciencedaily.com/releases/2010/02/100221143234.htm>.
University of California - San Diego. (2010, February 22). Damage to threatened Gulf of California habitats can be reversed. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2010/02/100221143234.htm
University of California - San Diego. "Damage to threatened Gulf of California habitats can be reversed." ScienceDaily. www.sciencedaily.com/releases/2010/02/100221143234.htm (accessed July 31, 2014).

Share This




More Plants & Animals News

Thursday, July 31, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Visitors Feel Part of the Pack at Wolf Preserve

Visitors Feel Part of the Pack at Wolf Preserve

AP (July 31, 2014) — Seacrest Wolf Preserve on the northern Florida panhandle allows more than 10,000 visitors each year to get up close and personal with Arctic and British Columbian Wolves. (July 31) Video provided by AP
Powered by NewsLook.com
Raw: Thousands Flocking to German Crop Circle

Raw: Thousands Flocking to German Crop Circle

AP (July 30, 2014) — Thousands of people are trekking to a Bavarian farmer's field to check out a mysterious set of crop circles. (July 30) Video provided by AP
Powered by NewsLook.com
Peace Corps Pulls Workers From W. Africa Over Ebola Fears

Peace Corps Pulls Workers From W. Africa Over Ebola Fears

Newsy (July 30, 2014) — The Peace Corps is one of several U.S.-based organizations to pull workers out of West Africa because of the Ebola outbreak. Video provided by Newsy
Powered by NewsLook.com
Concern Grows Over Worsening Ebola Crisis

Concern Grows Over Worsening Ebola Crisis

AFP (July 30, 2014) — Pan-African airline ASKY has suspended all flights to and from the capitals of Liberia and Sierra Leone amid the worsening Ebola health crisis, which has so far caused 672 deaths in Guinea, Liberia and Sierra Leone. Duration: 00:43 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

    Technology News



    Save/Print:
    Share:  

    Free Subscriptions


    Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

    Get Social & Mobile


    Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

    Have Feedback?


    Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
    Mobile iPhone Android Web
    Follow Facebook Twitter Google+
    Subscribe RSS Feeds Email Newsletters
    Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins