Some fish species recover at different rates when fishing is eliminated inside MPAs. A new study in Ecological Applications explores how sex-changing fish species can actually recover faster than fixed-sex species.
Nearly half of the fish caught worldwide are from stocks that are scientifically monitored and, on average, are increasing in abundance. Effective management appears to be the main reason these stocks are at sustainable levels or successfully rebuilding, according to a new study led by the University of Washington.
By taking advantage of the unique genomic model organism of tiny waterfleas, or Daphnia, an international team of researchers has now analyzed Daphnia from a phosphorus-rich Minnesota lake -- and compared it to revived, 600-year-old Daphnia dormant eggs found in the bottom sediments -- to better understand how these creatures cope with a dramatic environmental change.
Until now, little has been known about the evolution of vision in cartilaginous fishes, particularly sharks and their genetic cousins, the rays. In a new study, it has been shown that all cartilaginous fishes, similar to the marine mammals, have lost the SWS1 and SWS2 opsin genes. Sharks and rays do contain both rod and cone photoreceptors; however rays possess two cone opsin genes whereas sharks have only one cone. Sharks therefore were found to have lost the ability to see colors.
Marine protected areas reduce fish mortality by limiting harvesting and reducing habitat destruction. They are often designed and implemented to promote biodiversity conservation and sustainable fisheries. New research shows these conservation efforts lead not only to an increase in the total number of fishes (individuals) in general. Protected areas in the northern Mediterranean Sea also harbor a higher number of common fish species, and significant positive network effects accumulate between individual reserves.
The abandonment of high-altitude mountain pastures and the climatic changes that are causing woodland boundaries to extend ever higher, may potentially result in the reduction of the number and variety of invertebrates living in mountain streams. Eurac Research ecologists have compared 15 streams and found that in streams running through extensive meadows with grazing animals -- regardless of elevation -- biodiversity is greater. The study was published in the renowned international journal Freshwater Biology.
A new study from researchers at the Scripps Institution of Oceanography at the University of California San Diego has documented a successful recovery effort among Nassau Grouper populations in the Cayman Islands thanks to an approach involving government agencies, academic researchers, and nonprofit organizations.
Tiny bits of DNA collected from waters off the West Coast allowed scientists to identify more species of marine vertebrates than traditional surveys with trawl nets. They also reflect environmental shifts such as unusual ocean temperatures that affect the organisms present, new research shows.
The same technology that powers facial recognition and self-driving cars may soon help Maine's shellfish industry protect people from the dangerous effects of harmful algal blooms. A recent paper reports how researchers can use these deep learning algorithms to forecast shellfish toxicity, just like meteorologists forecast the weather.
While many conservation plans focus on only environmental indicators for success, the Wildlife Conservation Society (WCS)'s coral reef program is trying a relatively new approach: focusing on both social and ecological processes and outcomes to ensure a long-term future for coral reef systems, according to a newly published study.