Scientists say Nile crocs may be thriving in Sunshine State swamps
The latest non-native species to invade Florida’s subtropical clime is a man-eater, according to University of Florida researchers who say they’ve genetically identified Nile crocodiles living in the swamps of the Sunshine State.
The aquatic reptiles can grow as long as 18 feet and weigh as much as a small car, and in their native habitat eat everything from hippos and zebras to humans. In Florida, they could eat native birds, fish and mammals, as well as the state’s native crocodile and alligators, said the researchers, have confirmed the capture of multiple Nile crocodiles in the wild, using DNA analysis.
Researchers track chytrid in mountains of Cameroon
Africa’s frogs may also be succumbing to the chyrid fungus that has wiped out species around the world, researchers reported this week in the journal PLOS ONE.
Tracking frogs on Cameroon’s Mount Oku and Mount Manengouba over a span of more than 12 years, University of Florida herpetologist David Blackburn and colleagues at the Museum für Naturkunde in Berlin have linked declines of at least five frog species linked with chytrid — possibly exacerbated by habitat destruction, pollution and climate change. Continue reading “Biodiversity: Frog-killing fungus turns up in Africa”→
Using a vast sample of data collected in a citizen science project, researchers say they’ve been able to discern how hydropeaking affects aquatic insects that form the base of river food chains. The information could help resource managers develop alternative hydropower practices that aren’t as harmful to ecosystems, according to a new study published in the journal BioScience.
Hydropeaking refers to the practice of increasing river flows at times of peak demand, generally during the day. This study shows how abrupt water level changes affect aquatic insects in every stage of life. The research was done by scientists with the U.S. Geological Survey, Oregon State University, Utah State University and Idaho State University. Continue reading “Environment: Can dams be operated without killing rivers?”→
Wolf advocates hope for more releases of captive-bred wolves
The U.S. Fish and Wildlife Service this week agreed to prepare a recovery plan for Mexican gray wolves by 2017. The court settlement will compel the federal agency to finally meet its legal obligation to ensure that the wolves can establish a healthy, sustainable population. The settlement may speed up the slow-going conservation and recovery effort.
The settlement came in response to a lawsuit filed by a coalition of wolf-conservation groups, environmental organizations and a retired federal wolf biologist. Less than 100 Mexican gray wolves exist in the wild, making it one of the most endangered mammals in North America. The settlement follows a September 2015 ruling by a federal judge in Tucson that rejected the government’s effort to dismiss the case.
The decline of milkweed may not be the main factor driving monarch butterflies toward oblivion, according to a new study by Cornell University scientists. Weather, habitat fragmentation and dwindling sources of nectar in the autumn are also critical, the new study reports.
“Thanks to years of data collected by the World Wildlife Fund and citizen-scientists across North America, we have pieced together the monarch life cycle to make inferences about what is impacting the butterflies,” said Cornell University Prof. Anurag Agrawal.
Feds dial back proposed regs that would have made it harder to seek endangered species protection
Many plants and animals that are protected as endangered species in the U.S. got that status because conservation groups — representing concerned citizens — petitioned the federal government. It’s a process that’s explicitly mandated by the Endangered Species Act, but that has led to serious frustration among government biocrats and various extractive industries that specialize in exploiting public land resources.
In an attempt to try and cripple citizen groups, the U.S. Fish and Wildlife Service recently proposed making the petitioning process much more difficult by requiring pre-clearance from state agencies and limiting petitions to a single species. All in all, the proposal was aimed at trying to avoid giving protection to species that need it. Continue reading “Watchdog group keeps door open for endangered species petitions”→