Reefs help protect vulnerable Caribbean fish from climate change

Reef and fish. Image: Jeff Mitton
Climate Change

Science Daily reports on a new study about how bigger, healthier reefs can help protect the Caribbean’s fisheries from the impacts of ocean warming due to climate change:

New research from UBC’s Institute for the Oceans and Fisheries suggests that larger reef areas may help protect the Caribbean’s coral reef fish communities from the impacts of ocean warming.

“We are seeing alterations to local reef fish populations due to warming ocean temperatures, particularly in those Caribbean countries that are closer to the equator, like Trinidad and Tobago, where commercially important fishes such as Cero and Northern red snapper are on the decline already,” said Ravi Maharaj, first author and PhD candidate at the Institute for the Oceans and Fisheries.

The study looked at the size of reefs in the exclusive economic zones (EEZ) — estimated from satellite imagery — of nine Caribbean countries and assessed the impact of rising ocean temperatures on the fish that are most important to the local fisheries. The researchers examined how reef size may moderate such impacts.

Using sea water temperature and fisheries records going back to the 1970s, researchers found that the Caribbean Sea is warming, and fish that like cooler temperatures were decreasing in dominance in the catch. But they also found that the change in fish composition was slower in countries with larger coral reefs compared to countries with smaller coral reefs.

Using findings from the study, the researchers predict that changes in fish community can be reduced by 30 to 80 per cent with a doubling of reef area. This highlights the potential effectiveness of interventions that may maintain and restore reef habitats to reduce climate impacts on fish communities.

“With a small degree of warming, some fish may be able to acclimate but they need suitable habitat to grow and thrive,” said Maharaj. “More refuge can be found in bigger reefs, however, with the addition of habitat loss due to pollution, coral bleaching, damage from the storms that frequent the area as well as unmanaged fishing pressures, such fish refuge is becoming rarer.”

Most of the fisheries along the many coral reefs in the Caribbean are small-scale and subsistence-based, providing one of the main sources of food and employment, however, the fisheries are currently unmanaged. The researchers say that policy makers should focus their attention on habitat protection and fisheries management in the area.

Read the original report at Science Daily.

 

[Image: Jeff Mitton]

No Comments

Leave a Reply

Your email address will not be published. Required fields are marked *

Coral, Dominican Republic. Image: Carson
Biodiversity
Co-management for coral reef protection in the Dominican Republic

An article from Monga Bay about the establishment of the Southeast Marine Sanctuary in the Dominican Republic, with a focus on the Sanctuary’s innovative co-management model: [A] new and unique marine sanctuary, the Southeast Marine Sanctuary, has recently been declared. Combined, this new marine sanctuary and the existing Cotubanamá Park …

St. Joseph's church, Barbados. Image: Simon Bélec
Climate Change
Environment on the agenda at Caribbean theology conference

From Repeating Islands, a report on the recently held 19th Conference on Theology in the Caribbean Today, which focussed on climate change and the environment: Curaçao-based Nobo reports that the 19th Conference of Theology in the Caribbean recently took place in Suriname. The Conference saw the participation of 30 persons, …

Nassau Grouper. Image: Farshid Ahrestani.
Biodiversity
Climate change threatens reef fish conservation in the Caribbean

Climate change could undo years of work to protect and conserve the endangered Nassau Grouper: For more than 20 years, conservationists have been working to protect one of the most recognizable reef fish in the Caribbean, the endangered and iconic Nassau grouper, and thanks to those efforts, populations of this …