News Article | April 9, 2017
The Earth has been around for millions of years so it is not surprising that humans still have a lot to discover about the Earth's ecosystem, especially since creatures continue to adapt to the changing environment. In December 2016, scientists discovered six new marine species in the Indian Ocean floor with the help of a robot. Now a professor of Aquatic Biology from the University of Kerala confirms that an elusive spider-like creature spotted in trees in Kerala is actually a new species. Sightings of a spider-like crab that climbs and lives in trees in the Western Ghats of South India were first reported by the Kani tribe in 2014. Incidentally, Professor Biju Kumar was in the area at that time to survey freshwater crabs but, even with the help of his student and members of the Kani tribesmen, it took Professor Kumar months before he was finally able to track down and capture a couple of the elusive long-legged crabs. In honor of the tribe that led to the discovery, the new crab species has been named Kani maranjandu which is, basically, the name of the Kani tribe and the local term for "tree crab." The crabs can supposedly fit in the palm of a human hand and has a deep bluish-black body that is broad, swollen, and convex. They also have long legs with slim, curved, and sharp ends that allow the crustaceans to get a good grip on the trees they climb. However, what makes the newly discovered creatures so striking is not its appearance but its behavior and way of life. According to Professor Kumar's study published in the Journal of Crustacean Biology, the Kani maranjandu lives up high in water-filled holes of tall deciduous and evergreen trees. The crustaceans are able to move rapidly as they climb up and down tree trunks but are very shy and tend to quickly hide in their holes when approached. Younger crabs, however, climb up and take shelter even higher in tree canopies that are about 30 feet above the ground. Scientists note that other tree-dwelling crab species climb only up to a few feet up a tree so the Kani maranjandu's behavior is pretty unusual for crabs. Professor Kumar also observed that the crab heavily relies on rainwater collected in tree hollows for survival, noting that the creatures abandon a hollow when it dries up. The crab's body shape enables it to hold water as it searches for a new tree hollow with water to occupy. Biologist Peter K.L. Ng from the National University of Singapore helped classify the new species and he believes that the Kani maranjandu is a good illustration of crab evolution. "The exciting thing for me is that these crabs, regardless of where they have been found, and how they are related (or unrelated) to each other, they have nevertheless evolved to use specialized habitats to enhance their survival," he says. © 2017 Tech Times, All rights reserved. Do not reproduce without permission.
News Article | March 11, 2016
They come from the West Coast, as far south as California, as north as Alaska, and as east as the Atlantic coast. Their joint letter refers to “Misrepresentation,” “lack of information,” and “Disregard for science that was not funded by the proponent.” Scientists condemn the flawed review process for Lelu Island, at the mouth of British Columbia’s Skeena River, as “a symbol of what is wrong with environmental decision-making in Canada.” More than 130 scientists signed on to this letter. “This letter is not about being for or against LNG, the letter is about scientific integrity in decision-making,” said Dr. Jonathan Moore, Liber Ero Chair of Coastal Science and Management, Simon Fraser University. One of the other signatories is Otto Langer, former Chief of Habitat Assessment at Department of Fisheries and Oceans (DFO), who wrote: These are tough words for a Federal government that promised to put teeth back in the gutted environmental review process. In Prime Minister Justin Trudeau’s defense, this is yet another problem he inherited from the previous administration, and the task of cleaning up this mess seems enormous. That said, this government was aware the environmental review process was broken before it was elected and has not intervened to at least stop the process from moving forward until it is prepared to take action. The Liberal Government appears to be facing a tough decision. So far, it has attempted to work with the provinces. On Lelu Island, as well as the equally controversial proposed Kinder Morgan Pipeline expansion and Site C Dam project, continuing to support Premier Clak’s policies in this manner would appear to necessitate betraying the trust of the Canadian people. Here are a few choice excerpts from the public letter that more than 130 scientists sent to Catherine McKenna and Prime Minister Trudeau: ” … The CEAA draft report has not accurately characterized the importance of the project area, the Flora Bank region, for fish. The draft CEAA report1 states that the “…marine habitats around Lelu Island are representative of marine ecosystems throughout the north coast of B.C.”. In contrast, five decades of science has repeatedly documented that this habitat is NOT representative of other areas along the north coast or in the greater Skeena River estuary, but rather that it is exceptional nursery habitat for salmon2-6 that support commercial, recreational, and First Nation fisheries from throughout the Skeena River watershed and beyond7. A worse location is unlikely to be found for PNW LNG with regards to potential risks to fish and fisheries….” ” … CEAA’s draft report concluded that the project is not likely to cause adverse effects on fish in the estuarine environment, even when their only evidence for some species was an absence of information. For example, eulachon, a fish of paramount importance to First Nations and a Species of Special Concern8, likely use the Skeena River estuary and project area during their larval, juvenile, and adult life-stages. There has been no systematic study of eulachon in the project area. Yet CEAA concluded that the project posed minimal risks to this fish…” ” … CEAA’s draft report is not a balanced consideration of the best-available science. On the contrary, CEAA relied upon conclusions presented in proponent-funded studies which have not been subjected to independent peer-review and disregarded a large and growing body of relevant independent scientific research, much of it peer-reviewed and published…” ” …The PNW LNG project presents many different potential risks to the Skeena River estuary and its fish, including, but not limited to, destruction of shoreline habitat, acid rain, accidental spills of fuel and other contaminants, dispersal of contaminated sediments, chronic and acute sound, seafloor destruction by dredging the gas pipeline into the ocean floor, and the erosion and food-web disruption from the trestle structure. Fisheries and Oceans Canada (DFO) and Natural Resources Canada provided detailed reviews12 on only one risk pathway – habitat erosion – while no such detailed reviews were conducted on other potential impacts or their cumulative effects…” ” … CEAA’s draft report concluded that the project posed moderate risks to marine fish but that these risks could be mitigated. However, the proponent has not fully developed their mitigation plans and the plans that they have outlined are scientifically dubious. For example, the draft assessment states that destroyed salmon habitat will be mitigated; the “proponent identified 90 000 m2 of lower productivity habitats within five potential offsetting sites that could be modified to increase the productivity of fisheries”, when in fact, the proponent did not present data on productivity of Skeena Estuary habitats for fish at any point in the CEAA process. Without understanding relationships between fish and habitat, the proposed mitigation could actually cause additional damage to fishes of the Skeena River estuary…” British Columbia Institute of Technology 1. Marvin Rosenau, Ph.D., Professor, British Columbia Institute of Technology. 2. Eric M. Anderson, Ph.D., Faculty, British Columbia Institute of Technology. British Columbia Ministry of Environment 1. R. S. Hooton, M.Sc., Former Senior Fisheries Management Authority for British Columbia Ministry of Environment, Skeena Region. California Academy of Sciences 1. John E. McCosker, Ph.D., Chair of Aquatic Biology, Emeritus, California Academy of Sciences. Department of Fisheries and Oceans Canada 1. Otto E. Langer, M.Sc., R.P.Bio., Fisheries Biologist, Former Chief of Habitat Assessment, Department of Fisheries and Oceans Canada Memorial University of Newfoundland 1. Ian A. Fleming, Ph.D., Professor, Memorial University of Newfoundland. 2. Brett Favaro, Ph.D., Liber Ero conservation fellow, Memorial University of Newfoundland. Norwegian Institute for Nature Research 1. Rachel Malison, Ph.D., Marie Curie Fellow and Research Ecologist, The Norwegian Institute for Nature Research. Russian Academy of Science 1. Alexander I. Vedenev, Ph.D., Head of Ocean Noise Laboratory, Russian Academy of Science 2. Victor Afanasiev, Ph.D., Russian Academy of Sciences. Sakhalin Research Institute of Fisheries and Oceanography 1. Alexander Shubin, M.Sc. Fisheries Biologist, Sakhalin Research Institute of Fisheries and Oceanography. Simon Fraser University, BC 1. Jonathan W. Moore, Ph.D., Liber Ero Chair of Coastal Science and Management, Associate Professor, Simon Fraser University. 2. Randall M. Peterman, Ph.D., Professor Emeritus and Former Canada Research Chair in Fisheries Risk Assessment and Management, Simon Fraser University. 3. John D. Reynolds, Ph.D., Tom Buell BC Leadership Chair in Salmon Conservation, Professor, Simon Fraser University 4. Richard D. Routledge, Ph.D., Professor, Simon Fraser University. 5. Evelyn Pinkerton, Ph.D., School of Resource and Environmental Management, Professor, Simon Fraser University. 6. Dana Lepofsky, Ph.D., Professor, Simon Fraser University 7. Nicholas Dulvy, Ph.D., Canada Research Chair in Marine Biodiversity and Conservation, Professor, Simon Fraser University. 8. Ken Lertzman, Ph.D., Professor, Simon Fraser University. 9. Isabelle M. Côté, Ph.D., Professor, Simon Fraser University. 10. Brendan Connors, Ph.D., Senior Systems Ecologist, ESSA Technologies Ltd., Adjunct Professor, Simon Fraser University. 11. Lawrence Dill, Ph.D., Professor Emeritus, Simon Fraser University. 12. Patricia Gallaugher, Ph.D., Adjunct Professor, Simon Fraser University. 13. Anne Salomon, Ph.D., Associate Professor, Simon Fraser University. 14. Arne Mooers, Ph.D., Professor, Simon Fraser University. 15. Lynne M. Quarmby, Ph.D., Professor, Simon Fraser University. 16. Wendy J. Palen, Ph.D., Associate Professor, Simon Fraser University. University of Alaska 1. Peter Westley, Ph.D., Assistant Professor of Fisheries, University of Alaska Fairbanks. 2. Anne Beaudreau, Ph.D., Assistant Professor of Fisheries, University of Alaska Fairbanks. 3. Megan V. McPhee, Ph.D., Assistant Professor, University of Alaska Fairbanks. University of Alberta 1. David.W. Schindler, Ph.D., Killam Memorial Professor of Ecology Emeritus, University of Alberta. 2. Suzanne Bayley, Ph.D., Emeritus Professor, University of Alberta. University of British Columbia 1. John G. Stockner, Ph.D., Emeritus Senior Scientist DFO, West Vancouver Laboratory, Adjuct Professor, University of British Columbia. 2. Kai M.A. Chan, Ph.D., Canada Research Chair in Biodiversity and Ecosystem Services, Associate Professor, University of British Columbia 3. Hadi Dowlatabadi, Ph.D., Canada Research Chair in Applied Mathematics and Integrated Assessment of Global Change, Professor, University of British Columbia 4. Sarah P. Otto, Ph.D., Professor and Director, Biodiversity Research Centre, University of British Columbia. 5. Michael Doebeli, Ph.D., Professor, University of British Columbia. 6. Charles J. Krebs, Ph.D., Professor, University of British Columbia. 7. Amanda Vincent, Ph.D., Professor, University of British Columbia. 8. Michael Healey, Ph.D., Professor Emeritus, University of British Columbia. University of California (various campuses) 1. Mary E. Power, Ph.D., Professor, University of California, Berkeley 2. Peter B. Moyle, Ph.D., Professor, University of California. 3. Heather Tallis, Ph.D., Chief Scientist, The Nature Conservancy, Adjunct Professor, University of California, Santa Cruz. 4. James A. Estes, Ph.D., Professor, University of California. 5. Eric P. Palkovacs, Ph.D., Assistant Professor, University of California-Santa Cruz. 6. Justin D. Yeakel, Ph.D., Assistant Professor, University of California. 7. John L. Largier, Ph.D., Professor, University of California Davis. University of Montana 1. Jack A. Stanford, Ph.D., Professor of Ecology, University of Montana. 2. Andrew Whiteley, Ph.D., Assistant Professor, University of Montana. 3. F. Richard Hauer, Ph.D., Professor and Director, Center for Integrated Research on the Environment, University of Montana. University of New Brunswick 1. Richard A. Cunjak, Ph.D., Professor, University of New Brunswick. University of Ontario Institute of Technology 1. Douglas A. Holdway, Ph.D., Canada Research Chair in Aquatic Toxicology, Professor, University of Ontario Institute of Technology. University of Ottawa 1. Jeremy Kerr, Ph.D., University Research Chair in Macroecology and Conservation, Professor, University of Ottawa University of Toronto 1. Martin Krkosek, Ph.D., Assistant Professor, University of Toronto. Gail McCabe, Ph.D., University of Toronto. University of Victoria 1. Chris T. Darimont, Ph.D., Associate Professor, University of Victoria 2. John Volpe, Ph.D., Associate Professor, University of Victoria. 3. Aerin Jacob, Ph.D., Postdoctoral Fellow, University of Victoria. 4. Briony E.H. Penn, Ph.D., Adjunct Professor, University of Victoria. 5. Natalie Ban, Ph.D., Assistant Professor, School of Environmental Studies, University of Victoria. 6. Travis G. Gerwing, Ph.D., Postdoctoral Fellow, University of Victoria. 7. Eric Higgs, Ph.D., Professor, University of Victoria. 8. Paul C. Paquet, Ph.D., Senior Scientist, Raincoast Conservation Foundation, Adjunct Professor, University of Victoria. 9. James K. Rowe, Ph.D., Assistant Professor, University of Victoria. University of Washington 1. Charles Simenstad, Ph.D., Professor, University of Washington. 2. Daniel Schindler, Ph.D., Harriet Bullitt Endowed Chair in Conservation, Professor, University of Washington. 3. Julian D. Olden, Ph.D., Associate Professor, University of Washington. 4. P. Sean McDonald, Ph.D., Research Scientist, University of Washington. 5. Tessa Francis, Ph.D., Research Scientist, University of Washington. University of Windsor 1. Hugh MacIsaac, Ph.D., Canada Research Chair Great Lakes Institute for Environmental Research, Professor, University of Windsor. Photo Credits: 9 of the scientist condemning the CEAA review are professors at the University of Victoria. Photo shows U Vic students listening to a UN official in 2012 by Herb Neufeld via Flickr (CC BY SA, 2.0 License); Screen shot from a Liberal campaign video in which Trudeau promised to bring real change to Ottawa;8 of the scientist condemning the CEAA review are professors at the University of British Columbia. Photo of UBC by abdallahh via Flickr (CC BY SA, 2.0 License);5 of the scientists condemning the CEAA review are from the University of Washington. Photo is Mary Gates Hall, in the University of Washington by PRONam-ho Park Follow via Flickr (CC BY SA, 2.0 License);5 of the scientists condemning the CEAA review are from the Skeena Fisheries Commission. Photo is Coast mountains near the mouth of the Skeena River by Roy Luck via Flickr (CC BY SA, 2.0 License);16 of the scientists condemning the CEAA review were professors at Simon Fraser University. Photo shows SFU’s Reflective Pool by Jon the Happy Web Creative via Flickr (CC BY SA, 2.0 License) Get CleanTechnica’s 1st (completely free) electric car report → “Electric Cars: What Early Adopters & First Followers Want.” Come attend CleanTechnica’s 1st “Cleantech Revolution Tour” event → in Berlin, Germany, April 9–10. 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Decaestecker E.,Aquatic Biology |
Verreydt D.,Catholic University of Leuven |
De Meester L.,Catholic University of Leuven |
Declerck S.A.J.,Netherlands Institute of Ecology
Ecology | Year: 2015
Increased productivity due to nutrient enrichment is hypothesized to affect density-dependent processes, such as transmission success of horizontally transmitting parasites. Changes in nutrient availability can also modify the stoichiometry and condition of individual hosts, which may affect their susceptibility for parasites as well as the growth conditions for parasites within the host. Consequently, if not balanced by increased host immuno-competence or life history responses, changes in the magnitude of parasite effects with increasing nutrient availability are expected. If these parasite effects are host-species specific, this may lead to shifts in the host community structure. We here used the Daphnia-parasite model system to study the effect of nutrient enrichment on parasite-mediated competition in experimental mesocosms. In the absence of parasites, D. magna was competitively dominant to D. pulex at both low and high nutrient levels. Introduction of parasites resulted in infections of D. magna, but not of D. pulex and, as such, reversed the competitive hierarchy between these two species. Nutrient addition resulted in an increased prevalence and infection intensity of some of the parasites on D. magna. However, there was no evidence that high nutrient levels enhanced negative effects of parasites on the hosts. Costs associated with parasite infections may have been compensated by better growth conditions for D. magna in the presence of high nutrient levels. © 2015 by the Ecological Society of America.
Coopman M.,Aquatic Biology |
Muylaert K.,Aquatic Biology |
Lange B.,Aquatic Biology |
Reyserhove L.,Aquatic Biology |
Decaestecker E.,Aquatic Biology
Freshwater Biology | Year: 2014
Summary: We investigate whether an increase in the occurrence of cyanobacterial blooms affects zooplankton-parasite interactions. Cyanobacteria are expected to be of poor food quality for zooplankton hosts and are therefore expected to increase parasitism. Nevertheless, simultaneous exposure to both stressors may lead to different results, given the antibacterial secondary metabolites of cyanobacteria. We exposed the zooplankter Daphnia magna to the cyanobacterial species Microcystis aeruginosa and the parasite that causes white bacterial disease in D. magna. Increased M. aeruginosa concentrations reduced the percentage of infected individuals and as such protected D. magna against parasitism. Interactions between M. aeruginosa and the parasite were antagonistic in terms of percentage of surviving Daphnia, total offspring per female and clutch size. Additional plating experiments showed a direct negative effect of Microcystis on bacterial growth. The results suggest that changes in phytoplankton affect host-parasite interactions in zooplankton. Contrary to the prevailing paradigm that multiple stressors often induce additive or synergistic effects, we report an antagonistic effect of the presence of cyanobacterial stress on parasites in Daphnia. Thus, assessment of the outcome of host-parasite interactions needs to incorporate the environmental context. © 2013 John Wiley & Sons Ltd.