Commercial Fishing Estimated to Kill Millions of Sea Turtles

The number of sea turtles inadvertently snared by commercial fishing gear over the past 20 years may reach into the millions, according to the first peer-reviewed study to compile sea turtle bycatch data from gillnet, trawl and longline fisheries worldwide.

The study, which was published online April 6 in the journal Conservation Letters, analyzed data compiled from peer-reviewed papers, government reports, technical reports, and symposia proceedings published between 1990 and 2008. All data were based on direct onboard observations or interviews with fishermen. The study did not include data from recreational fishing.

Six of the world’s seven species of sea turtles are currently listed as vulnerable, endangered or critically endangered on the IUCN Red List of Threatened Species.
“Direct onboard observations and interviews with fishermen indicate that about 85,000 turtles were caught between 1990 and 2008. But because these reports cover less than one percent of all fleets, with little or no information from small-scale fisheries around the world, we conservatively estimate that the true total is at least two orders of magnitude higher,” said Bryan Wallace, lead author of the new paper.
Wallace is the science advisor for the Sea Turtle Flagship Program at Conservation International and an adjunct assistant professor at Duke University’s Nicholas School of the Environment. Most of his co-authors are researchers at Duke’s Center for Marine Conservation.
Their global data review revealed that the highest reported bycatch rates for longline fisheries occurred off Mexico’s Baja California peninsula, the highest rates for gillnet fishing took place in the North Adriatic region of the Mediterranean and the highest rates for trawls occurred off the coast of Uruguay.

When bycatch rates and amounts of observed fishing activity for all three gear types were combined and ranked across regions, four regions emerged as the overall most urgent conservation priorities: the East Pacific, the Mediterranean, the Southwest Atlantic, and the Northwest Atlantic.
“Although our numbers are estimates, they highlight clearly the importance of guidelines for fishing equipment and practices to help reduce these losses,” Wallace said.
Effective measures to reduce turtle bycatch include the use of circle hooks and fish bait in longline fisheries, and Turtle Excluder Devices (TEDs) in trawling. Many of the most effective types of gear modifications, Wallace noted, have been developed by fishermen themselves.
Wallace said the Hawaiian longline fishery and the Australian prawn fishery have significantly reduced bycatch through close working relationships between fishermen and government managers, use of onboard observers, mandatory gear modifications and innovative technologies. TurtleWatch, a real-time database that provides daily updates on water temperatures and other conditions indicating where turtles might be found, has guided fishermen to avoid setting their gear in those areas.
Other approaches, such as the creation of marine protected areas and use of catch shares, also reduce bycatch, preserve marine biodiversity and promote healthy fish stocks in some cases, he said.
“Fisheries bycatch is the most acute threat to worldwide sea turtle populations today. Many animals die or are injured as a result of these interactions,” Wallace said. “But our message is that it’s not a lost cause. Managers and fishers have tools they can use to reduce bycatch, preserve marine biodiversity and promote healthy fish stocks, so that everyone wins, including turtles.”
The study stems from work Wallace began in 2005 as a postdoctoral research associate at the Duke University Marine Lab, where he helped develop the first global bycatch database for longline fisheries. That work was part of a three-year initiative called Project GloBAL (Global By-catch Assessment of Long-lived Species).
Co-authors on the new study – all of whom were part of the Project GloBAL team – are Rebecca L. Lewison of San Diego State University; Sara L. McDonald of Duke’s Center for Marine Conservation; Richard K. McDonald of the Center for Marine Conservation and the University of Richmond; Connie Y. Kot of the Center for Marine Conservation and the Marine Geospatial Ecology Lab at Duke’s Nicholas School of the Environment; and Shaleyla Kelez, Rhema K. Bjorkland, Elena M. Finkbeiner, S’rai Heimbrecht and Larry B. Crowder, all of the Center for Marine Conservation. Crowder is director of the center and the Stephen Toth Professor of Marine Biology at the Nicholas School. Lewison formerly was a research associate at the Duke Marine Lab.

By Timothy Lucas

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Cats found to offer support to breast cancer patients

(ARA) - Women facing breast cancer report that their cats rank among the most important of the many loyal, loving and understanding supporters they rely on to help them through their treatment. In fact, cats rank alongside parents and siblings as an important source of daily support, according to a recent survey.

Studies show that an important emotional connection exists between pets and their owners. During times of stress or illness, the bond between a pet and owner can be particularly strong. Missy Fish is undeniable proof of this.

Fish, a two-time breast cancer survivor, leaned on the companionship of her two cats, Phoebe and Jack, during her treatments.

"They were the perfect companions when I needed them most,” Fish says. “They were silent sources of strength and empowerment.”

Fish is far from the only breast cancer survivor to attest to the power of her cat. A recent Purina Cat Chow national survey of breast cancer survivors with cats underscores this important emotional connection and relationship.

The survey found that 84 percent of women battling breast cancer said their cat had a calming effect on them during their treatment. Cats also provided daily support to the patient, according to 76 percent of survivors surveyed.

Dr. Karen Sueda, a Diplomate at the American College of Veterinary Behaviorists, says that cats are perceptive to their owner's needs during an illness.

“Whether pet owners are fighting a disease such as breast cancer or going through a rough period in life such as job loss or financial stress, their cats often display intuitive behaviors of knowing when they need extra love and support," says Sueda.

Inspired by one cancer survivor’s touching story of the role her cat played during her battle with cancer, Purina Cat Chow is doing its part to help the fight against breast cancer. This year, in a partnership with Susan G. Komen for the Cure, Purina Cat Chow will donate more than $200,000 to the cause and will raise awareness for breast cancer through the Purina Cat Chow Connected for the Cause campaign.

“We have heard countless stories from breast cancer patients and survivors of how they have been emotionally supported by their cats,” says Katy Laciny, Purina Cat Chow's assistant brand manager. “Purina Cat Chow’s Connected for the Cause campaign honors this exceptional relationship and invites consumers to help us raise awareness and increase support for Susan G. Komen for the Cure so that a cure can be found.”

Susan G. Komen for the Cure is the world’s largest grassroots network of breast cancer survivors and activists fighting to save lives, empower people, ensure quality care for all and energize science to find the cures. The organization has invested $1.3 billion toward ending breast cancer, becoming the world’s largest source of non-profit funds dedicated to the fight against breast cancer.

Visit www.catchow.com/pink to hear survivor stories, read about the unique connection between survivors and their cats and share photos of support. For every picture uploaded, Purina Cat Chow will donate an additional $1 to Susan G. Komen for the Cure up to $10,000.

The Purina Cat Chow Connected for the Cause campaign culminates this October with limited-edition pink bags at grocery, mass and pet retailers nationwide in honor of National Breast Cancer Awareness Month. Products featuring pink bags include Purina Cat Chow Complete Formula and Purina Cat Chow Indoor Formula, both available in 3.5 pound and 16 pound bags.

For more information on the Purina Cat Chow Connected for the Cause campaign, go to www.catchow.com/pink.

Courtesy of ARAcontent

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Georgia Tech Study Reveals How Snakes Slither on Flat Terrain

Snakes use both friction generated by their scales and redistribution of their weight to slither along flat surfaces, researchers at New York University (NYU) and the Georgia Institute of Technology have found. Their findings, which appear in the latest issue of the journal Proceedings of the National Academy of Sciences, run counter to previous studies that have shown snakes move by pushing laterally against rocks and branches.

“We found that snakes’ belly scales are oriented so that snakes resist sliding toward their tails and flanks,” said the paper’s lead author, David Hu, a former postdoctoral researcher at NYU’s Courant Institute of Mathematical Sciences and now an assistant professor in Georgia Tech’s George W. Woodruff School of Mechanical Engineering. “These scales give the snakes a preferred direction of motion, which makes snake movement a lot like that of wheels, cross-country skis, or ice skates. In all these examples, sliding forwards takes less work than does sliding sideways.”

The study’s other co-authors were Jasmine Nirody and Terri Scott, both undergraduate researchers at NYU, and Michael Shelley, a professor of mathematics and neural science and the Lilian and George Lyttle Professor of Applied Mathematics at Courant.

The study centered on the frictional anisotropy—or resistance to sliding in certain directions—of a snake’s belly scales. While previous investigators had suggested that the frictional anisotropy of these scales might play a role in locomotion over flat surfaces, the details of this process had not been understood.

To explore this matter, the researchers first developed a theoretical model of a snake’s movement. The model determined the speed of a snake’s center of mass as a function of the speed and size of its body waves, taking into account the laws of friction and the scales’ frictional anisotropy. The model suggested that a snake’s motion arises by the interaction of surface friction and its internal body forces.

To confirm movement as predicted by the model, the researchers then measured the sliding resistance of snake scales and monitored the movement of snakes through a series of experiments on flat and inclined surfaces. They employed video and time-lapse photography to gauge their movements.

The results showed a close relationship between what the model predicted and the snakes’ actual movements. The theoretical predictions of the model were generally consistent with the snakes’ actual body speeds on both flat and inclined surfaces.

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New Study Shows Majority of Pet Cats Are Neutered

/PRNewswire/ -- A new study in the Journal of the American Veterinary Association reports that the vast majority -- at least 80% -- of pet cats in U.S. households are neutered, with middle-to higher-income households reporting rates of over 90%.

The peer-reviewed study, based on data collected for the national nonprofit organization Alley Cat Allies by Harris Interactive, Alley Cat Allies by Harris Interactive and analyzed by Alley Cat Allies using a rigorous statistical approach, is the first nationally representative study to thoroughly examine household income as it relates to the neuter status of pet cats.

"This study indicates that spaying and neutering is an accepted, established practice among the large majority of Americans with pet cats," said Becky Robinson, president of Alley Cat Allies. "This is a very positive finding. As a result, our nation's pet cats are living much healthier lives."

The study found that family income was the strongest predictor of whether house cats are neutered. In households earning $35,000 or more annually, 93% of cats were neutered, compared to 51% of cats in households earning less than $35,000. While both income groups reported a majority of their pet cats to be neutered, the disparity underscores a challenge long observed by Alley Cat Allies, said Robinson.

"Up until now, there has been a lot of speculation that income is a barrier for neuter in lower-income families, but now we have a scientific study establishing that this is the case nationally," Robinson said.

"It is also critical to point out that household cats represent only part of the total U.S. cat population," said Wendy Anderson, director of law and policy for Alley Cat Allies and a co-author of the study.

"Previous research has shown there may be just as many stray and feral cats in the U.S. as pet cats, and most of these cats are intact and breeding. We need to enact smart policies and programs that expand the availability of low-cost, high-volume spay and neuter services, not only to serve lower-income pet owners, but to provide services for feral cats as well," Anderson said.

The study ("Population Characteristics and Neuter Status of Cats Living in Households in the United States," J Am Vet Med Assoc 2009; 234:1023-1030) consisted of 1,205 respondents across the continental U.S., contacted by telephone and selected via random-digit dial methodology. Following completion of the data collection, respondents were weighted for region, age, gender, education, income, race and ethnicity to ensure a sample representative of the U.S. population.

Based on the nationally representative sample, the study concluded that there are approximately 82.4 million pet cats in the United States, living in a total of 36.8 million households. One third of these households reported adopting at least one of their cats as a stray.

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Scientists Conclude That Culling Whales Will Not Help Fisheries in Tropical Regions

/PRNewswire-USNewswire/ -- Culling whales will not increase fisheries catches in tropical waters, according to a new paper supported by the Lenfest Ocean Program and published today in the journal Science. For years, Japan has argued that reducing the number of baleen whales in the oceans would improve fisheries because whales eat fish that are caught for human consumption. The study published today found that even a complete eradication of whale populations in tropical waters would not lead to any significant increase in fish populations.

Many countries in Western Africa and the Caribbean have been persuaded by Japan to join the International Whaling Commission (IWC) and vote in favor of resuming commercial whaling with the understanding that culling whales would result in increased fisheries catches.

"Our models unequivocally show that removing whales would not significantly increase the amount of commercially valuable fish," said Dr. Leah Gerber, lead author and associate professor of Ecology, Evolution and Environmental Science at Arizona State University. "Instead, we found that fishing is having a far greater bearing on the health of the fish stocks in the region. Interestingly, when whales were more abundant before World War II, the fisheries were in good shape."

"The assertion that whales are competing with fisheries for food is, on the surface, very persuasive, because it seems intuitive that these large animals must be consuming enormous amounts of food," said Dr. Kristin Kaschner, an author based at the Evolutionary Biology and Ecology Lab at the University of Freiburg, Germany. "However, competition within ecosystems is a complex issue and needs to be investigated using the appropriate scientific tools."

The authors constructed ecosystem models, which account for feeding interactions between whales and fish, to understand the role that baleen whales play in tropical marine ecosystems in Western Africa and the Caribbean, where baleen whales are known to breed. The scientists used global and regional data, validated through scientific workshops in Senegal and Barbados, to determine whether competition was occurring.

"An ocean ecosystem is greater than the sum of its parts. Removing whales from the equation does not increase the number of fish and impacts the health of the overall system," said Dr. Lyne Morissette, an author based at the Institut des Sciences de la Mer de Rimouski, Canada. "We need to focus on truly effective and sustainable management approaches to recover our fisheries."

The researchers suggest these results underscore the important role of science in policy decisions about whales and fisheries interactions. They also emphasize that the goal of ecosystem-based management should not be to manipulate individual components of food webs in an attempt to maximize the amount of fish to catch, but to manage the whole system for long-term sustainability.

"All countries should adopt leadership roles in a common effort to manage our fisheries better," said Dr. Daniel Pauly, an author from the University of British Columbia. "The assertion that fish supply is in peril is legitimate, but the problem is resolved with better management, not whaling."

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Dogs Chase Efficiently, but Cats Skulk Counterintuitively

A Duke University study suggests that evolution can behave as differently as dogs and cats. While the dogs depend on an energy-efficient style of four-footed running over long distances to catch their prey, cats seem to have evolved a profoundly inefficient gait, tailor-made to creep up on a mouse or bird in slow motion.

"It is usually assumed that efficiency is what matters in evolution," said Daniel Schmitt, a Duke associate professor of evolutionary anthropology. "We've found that's too simple a way of looking at evolution, because there are some animals that need to operate at high energy cost and low efficiency."

Namely cats.

In a report published online Nov. 26 in the research journal Public Library of Science (PLoS), Schmitt and two former Duke co-researchers followed up on a scientific hunch by measuring and videotaping how six housecats moved along a 6 yard-long runway in pursuit of food treats or feline toys.

Long-distance chase predators like dogs can reduce their muscular work needed to move forward by as much as 70 percent by allowing their body to rise and fall and exchanging potential and kinetic energy with each step. In contrast, the maximum for cats is about 37 percent and much lower than that in a stalking posture, the report found.

"An important implication of these results is the possibility of a tradeoff between stealthy walking and economy of locomotion," the three researchers wrote in PLoS. "These data show a previously unrecognized mechanical relationship in which crouched postures are associated with changes in footfall pattern, which are in turn related to reduced mechanical energy recovery."

In other words, they found that when cats slink close to the ground they walk in a way that "the movements of their front and back ends cancel each other out," Schmitt said. While that's not good for energy efficiency "the total movement of their bodies is going to be even and they'll be flowing along," he added

"If they're creeping, they're going to put this foot down, and then that foot down and then that one in an even fashion. We think it has to do with stability and caution, Schmitt said."

Walking humans recover as much energy as dogs, said Schmitt, who studies gaits of various mammals. "Our centers of mass rise and fall when we walk. And when we do that, humans and other animals exchange potential and kinetic energy. It's an evolutionary miracle in my view.

"But cats need to creep up on their prey. Most scientists think that energetic efficiency is the currency of natural selection. Here we've shown that some animals make compromises when they have to choose between competing demands."

The study was supported by the National Science Foundation. Kristin Bishop, a former postdoctoral researcher at Duke, was the lead researcher and first author. Another author was Anita Pai, a former Duke undergraduate who is now a medical student at Vanderbilt University.


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UGA Study Reveals Ecosystem-Level Consequences of Frog Extinctions

In some parts of the tropics, frogs are the most abundant land vertebrates. This peculiar-looking casque-headed tree frog is one of the estimated hundreds of species of tropical frogs.

Photo by Scott Connelly/UGA

Streams that once sang with the croaks, chirps and ribbits of dozens of frog species have gone silent. They’re victims of a fungus that’s decimating amphibian populations worldwide.

Such catastrophic declines have been documented for more than a decade, but until recently scientists knew little about how the loss of frogs alters the larger ecosystem. A University of Georgia study that is the first to comprehensively examine an ecosystem before and after an amphibian population decline has found that tadpoles play a key role keeping the algae at the base of the food chain productive.

“Many things that live in the stream depend on algae as a base food resource,” said lead author Scott Connelly, a doctoral student who will graduate in December from the UGA Odum School of Ecology. “And we found that the system was more productive when the tadpoles were there.”

The results, which appear in the early online edition of the journal Ecosystems, demonstrate how the grazing activities of tadpoles help keep a stream healthy. The researchers found that while the amount of algae in the stream was more than 250 percent greater after the amphibian population decline, the algae were less productive at turning sunlight and nutrients into food for other members of the ecosystem. Without tadpoles swimming along the streambed and stirring up the bottom, the amount of sediment in the stream increased by nearly 150 percent, blocking out sunlight that algae need to grow.

The study is part of a larger effort known as the Tropical Amphibian Declines in Streams (TADS) project, which also involves researchers from Southern Illinois University, Drexel University and the University of Alabama. The project is now in its third round of funding by the National Science Foundation and was initiated by Catherine Pringle (UGA Odum School of Ecology) and Karen Lips (Southern Illinois University) in 2000 through a Small Grant for Exploratory Research (SGER) from the NSF. Connelly and Pringle are monitoring in-stream effects of the population decline on algae, while other team members are studying how the loss of frogs impacts other organisms and the transfer of energy between streams and the terrestrial communities that surround them. Preliminary data show that the number of snakes that feed on frogs, for example, has plummeted after the population decline.

“We were there before, during and after the extinction event and were able to look at the ecosystem and measure how it changed,” said Pringle, Distinguished Research Professor in the Odum School and study co-author. “Very rarely have scientists been able to do that with respect to any organism.”

The chytrid fungus responsible for declines has steadily marched southeast across Costa Rica and through much of Panama like a storm front, killing up to 90 percent of frogs in afflicted streams. In 2003, the team set up research sites on two streams in the pristine and lush highlands of Panama. One study site had already suffered a catastrophic amphibian decline, while the other had a healthy population but, based on its location, was directly in the path of the fungal disease.

In the first stage of their research, Connelly and Pringle assessed ecosystem changes that occur when tadpoles are experimentally excluded from small areas of both the healthy stream and the frogless stream. They found that the absence of the tadpoles resulted in more sediment and less productive algae.

In late 2004, frogs in the formerly healthy stream began dying. The team reassessed the stream and found that impact of the frog die-off was even greater than they had predicted in their exclusion studies. “We predicted the direction of the change,” Pringle said, “but underestimated its magnitude.”

The UGA research team is continuing to monitor the health of the streams to get valuable, long-term data. So far the stream has not rebounded. “It’s still sad going back,” Connelly said, to which Pringle added: “Once the frogs die, it’s like an incredible silence descends over the whole area. It’s eerie.”

To date, scientists have not found a way to stop the spread of the fungus in the wild. Broadly applying a fungicide to an entire watershed, Connelly said, would kill beneficial fungi that are necessary for a healthy ecosystem.

But scientists can cure individual frogs in captivity by simply swabbing them with a fungicide. Connelly has worked to protect frogs through Amphibian Ark, a global effort supported by zoos, botanical gardens, aquariums and research institutions that aims to ensure the survival of amphibians by collecting and breeding them. The Atlanta Botanical Garden is one of the key breeding sites.

“The one speck of hope is that if we’re able to collect some of these rare animals, we can cure them,” Connelly said. “As long as we have the money to keep a breeding program going, in the future it might be possible to reintroduce them into the wild.”

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Diversity of Plant-Eating Fish May be Key to Coral Reef Recovery

For endangered coral reefs, not all plant-eating fish are created equal.

A report scheduled to be published this week in the early edition of the journal Proceedings of the National Academy of Sciences suggests that maintaining the proper balance of herbivorous fishes may be critical to restoring coral reefs, which are declining dramatically worldwide. The conclusion results from a long-term study that found significant recovery in sections of coral reefs on which fish of two complementary species were caged.

Coral reefs depend on fish to eat the seaweeds with which the corals compete, and without such cleaning, the reefs decline as corals are replaced by seaweeds. Different fish consume different seaweeds because of the differing chemical and physical properties of the plants.

“Of the many different fish that are part of coral ecosystems, there may be a small number of species that are really critical for keeping big seaweeds from over-growing and killing corals,” explained Mark Hay, the Harry and Linda Teasley Professor of Biology at the Georgia Institute of Technology. “Our study shows that in addition to having enough herbivores, coral ecosystems also need the right mix of species to overcome the different defensive tactics of the seaweeds.”

By knowing which fish are most critical to maintaining coral health, resource managers could focus on protecting and enhancing the highest-impact species. In situations where local peoples depend on fishing, they might better sustain the reefs on which they depend by harvesting only less critical species.

“This could offer one more approach to resource managers,” Hay added. “If ecosystems were managed for critical mixes of herbivorous species, we might see more rapid recovery of the reefs.”

Believed to be the first study to demonstrate the importance of herbivore diversity in enhancing the growth of coral reefs, the research was conducted at the National Undersea Research Center in Key Largo, Florida. It was supported by the National Oceanic and Atmospheric Administration, the National Science Foundation and the Teasley Endowment at Georgia Tech.

Working 60 feet below the surface near the underwater laboratory Aquarius, Hay and co-author Deron E. Burkpile – who is now at Florida International University in North Miami – constructed 32 cages on a coral reef. Each cage was about two meters square and one meter tall and was sealed so that larger fish could neither enter nor leave.

The number and type of fish placed into each four-square-meter cage varied. Some cages had two fish that were able to eat hard, calcified plants; some had two fish able to eat soft, but chemically-defended plants; some had one of both types, and some had no fish at all. The cages were observed for a period of ten months starting in November 2003, and the change in coral cover and seaweed growth was measured.

“For the cages in which we mixed the two species of herbivores, the fish were able to remove much more of the upright seaweeds, and the corals in those areas increased in cover by more than 20 percent during ten months,” Hay said. “That is a dramatic rate of increase for a Caribbean reef.”

Though the percentage growth was impressive, the actual growth in size of each coral was small, Hay noted. Prior to the experiment, the coral reef areas studied had just four to five percent coverage of live coral. After ten months, the corals caged with the two species showed six to seven percent coverage. Corals caged with just one type of fish or no fish lost as much as 30 percent of their cover during the time period.

Hay and Burkepile attempted to repeat their experiment with a different species of fish, but the underwater cages were wiped away by Hurricane Dennis in July 2005 after only seven months of study.

The researchers studied the effects of the redband parrotfish (Sparisoma aurofrenatum) and the ocean surgeonfish (Acanthurus bahianus) in the first experiment, and the redband parrotfish and princess parrotfish (Scarus taeniopterus) in the second. The two fish per cage was at the “high end” of fish density found on present-day Caribbean reefs, but historic densities might have been much higher before extensive fishing of the Caribbean, Hay said.

Just two decades ago, coral coverage in the Caribbean was commonly 40 to 60 percent. Scientists blame many factors – disease, overfishing, pollution, excessive nutrients and global climate change – for the rapid decline, which has also been seen to differing degrees among coral reefs worldwide.

“Some people would argue that coral reefs really don’t exist as functional ecosystems in the Caribbean anymore,” Hay said. “The best reefs we have today are poor cousins to what was only average 20 years ago.”

For the future, Hay would like to expand the experiments to study the effects of additional species, and repeat the studies in different areas, such as the Fiji Islands, where residents are concerned about sustainability of the coral reefs. Though dependent on local fish for their protein, he said the Fiji Islanders may be able to change their fishing habits if researchers can determine which fish must be protected to help the reefs.

“The data we are seeing in Fiji suggests that diversity may be even more important there than it was in the Caribbean,” he said. “There are a lot of different species doing a lot of very different things. These consumers are very important, and in areas where they are over-fished, the reefs are crashing.”

The study provides more proof of how important biodiversity can be to maintaining healthy ecosystems.

“Species diversity is critically important, but we are losing critical components of the Earth’s ecosystem at an alarming rate,” Hay said. “There has been little work on the role of diversity among consumers and the effect that has on communities. This study will help add to our knowledge in this critical area.”

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