Andrew is a freelance marine biologist in North Carolina focused on population and conservation genetics in hydrothermal vent communities.
David is a graduate student in Florida. He studies the ecology and conservation of sharks.
Amy is a graduate student in North Carolina studying local ecological knowledge within small scale fisheries.
Chuck is a graduate student in North Carolina focusing on apex predators and how they interact with fisheries.
Lyndell is a graduate student in North Carolina, studying the feeding ecology of cownose rays.
Iris is a graduate student in Washington studying habitat use and feeding habits of juvenile Pacific salmon and herring in Puget Sound.
Michael is a graduate student in Maryland investigating the visual systems of mantis shrimp.
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By David Shiffman, on August 19th, 2012
The American Elasmobranch Society is a non-profit professional society focusing on the scientific study and conservation of sharks, skates, and rays. AES members meet each year in a different North American city, and this meeting is the world’s largest annual gathering of shark scientists. AES recently met in Vancouver, British Columbia for the 2012 meeting, and for the first time the event was live-tweeted by meeting attendees, including myself. I’ve organized the best conference tweets by session using Storify. If anyone has any questions or comments about the research presented below, please feel free to share it in the comments section of this blog post.
Here are selected tweets from the Elasmobranch Ecology sessions.
Continue reading Tweets from the American Elasmobranch Society: Elasmobranch Ecology
By David Shiffman, on August 19th, 2012
The American Elasmobranch Society is a non-profit professional society focusing on the scientific study and conservation of sharks, skates, and rays. AES members meet each year in a different North American city, and this meeting is the world’s largest annual gathering of shark scientists. AES recently met in Vancouver, British Columbia for the 2012 meeting, and for the first time the event was live-tweeted by meeting attendees, including myself. I’ve organized the best conference tweets by session using Storify. If anyone has any questions or comments about the research presented below, please feel free to share it in the comments section of this blog post.
Here are selected tweets from the Elasmobranch Conservation sessions.
Continue reading Tweets from the American Elasmobranch Society: Elasmobranch Conservation
By David Shiffman, on August 19th, 2012
The American Elasmobranch Society is a non-profit professional society focusing on the scientific study and conservation of sharks, skates, and rays. AES members meet each year in a different North American city, and this meeting is the world’s largest annual gathering of shark scientists. AES recently met in Vancouver, British Columbia for the 2012 meeting, and for the first time the event was live-tweeted by meeting attendees, including myself. I’ve organized the best conference tweets by session using Storify. If anyone has any questions or comments about the research presented below, please feel free to share it in the comments section of this blog post.
Here are selected tweets from the Gruber Award (best student presentation) sessions.
Continue reading Tweets from the American Elasmobranch Society: Gruber Award (best student presentation) talks
By David Shiffman, on August 19th, 2012
The American Elasmobranch Society is a non-profit professional society focusing on the scientific study and conservation of sharks, skates, and rays. AES members meet each year in a different North American city, and this meeting is the world’s largest annual gathering of shark scientists. AES recently met in Vancouver, British Columbia for the 2012 meeting, and for the first time the event was live-tweeted by meeting attendees, including myself. I’ve organized the best conference tweets by session using Storify. If anyone has any questions or comments about the research presented below, please feel free to share it in the comments section of this blog post.
Here are selected tweets from the Elasmobranch Genetics session.
Continue reading Tweets from the American Elasmobranch Society: Elasmobranch Genetics
By David Shiffman, on August 18th, 2012
The American Elasmobranch Society is a non-profit professional society focusing on the scientific study and conservation of sharks, skates, and rays. AES members meet each year in a different North American city, and this meeting is the world’s largest annual gathering of shark scientists. AES recently met in Vancouver, British Columbia for the 2012 meeting, and for the first time the event was live-tweeted by meeting attendees, including myself. I’ve organized the best conference tweets by session using Storify. If anyone has any questions or comments about the research presented below, please feel free to share it in the comments section of this blog post.
Here are selected tweets from the Elasmobranch Anatomy, Development, and Physiology session.
Continue reading Tweets from the American Elasmobranch Society: Anatomy, Development, and Physiology
By David Shiffman, on August 18th, 2012
The American Elasmobranch Society is a non-profit professional society focusing on the scientific study and conservation of sharks, skates, and rays. AES members meet each year in a different North American city, and this meeting is the world’s largest annual gathering of shark scientists. AES recently met in Vancouver, British Columbia for the 2012 meeting, and for the first time the event was live-tweeted by meeting attendees, including myself. I’ve organized the best conference tweets by session using Storify. If anyone has any questions or comments about the research presented below, please feel free to share it in the comments section of this blog post.
Here are selected tweets from the Elasmobranch Behavior sessions.
Continue reading Tweets from the American Elasmobranch Society: Elasmobranch Behavior
By David Shiffman, on August 18th, 2012
The American Elasmobranch Society is a non-profit professional society focusing on the scientific study and conservation of sharks, skates, and rays. AES members meet each year in a different North American city, and this meeting is the world’s largest annual gathering of shark scientists. AES recently met in Vancouver, British Columbia for the 2012 meeting, and for the first time the event was live-tweeted by meeting attendees, including myself. I’ve organized the best conference tweets by session using Storify. If anyone has any questions or comments about the research presented below, please feel free to share it in the comments section of this blog post.
Here are selected tweets from the Deepwater Chondrichthyans Symposium.
Continue reading Tweets from the American Elasmobranch Society: Deepwater Chondrichthyans Symposium
By David Shiffman, on August 18th, 2012
 The American Elasmobranch Society is a non-profit professional society focusing on the scientific study and conservation of sharks, skates, and rays. AES members meet each year in a different North American city, and this meeting is the world’s largest annual gathering of shark scientists. AES recently met in Vancouver, British Columbia for the 2012 meeting, and for the first time the event was live-tweeted by meeting attendees, including myself. I’ve organized the best conference tweets by session using Storify. If anyone has any questions or comments about the research presented below, please feel free to share it in the comments section of this blog post.
Here are conference tweets from AES President Lara Ferry’s plenary talk, “Elasmobranchs in Biological Research”.
Continue reading Tweets from the American Elasmobranch Society: President Ferry’s plenary “Elasmobranchs in Biological Research”
By David Shiffman, on July 3rd, 2012
When Dr. Gavin Naylor and his team started a genetic survey of existing shark and ray species, they didn’t expect the results of their project to make international news. Their recent paper (which, at over 250 pages and complete with more than 100 figures, is nothing short of epic), however, is too striking to ignore. The results indicate that there may be as many as 79 previously unrecognized cryptic species of sharks and rays.
A cryptic species is defined as a group that looks almost exactly like another, and may even live in the same region, but is genetically distinct. We’ve known that cryptic species of sharks and rays exist for some time, such as manta rays and scalloped hammerhead sharks, but 79 is a lot; as of the paper’s publication, only 1,221 species of sharks and rays were recognized.
According to Dr. Naylor,
“Organisms become genetically differentiated over time through the cumulative effects of mutation and recombination mediated via drift and selection. When they differentiate in isolation they eventually become so different from the parental stock from which they were derived that they can no longer produce fertile offspring when crossed with them. Some biologists use the point of reproductive inviability as the point at which new species should be recognized….. For practical purposes we recognize “new species” as being genetically or morphologically distinctive from previously recognized forms.”
The study’s methods, though enormous in scope, were relatively basic. According to Dr. Naylor, the study utilized a technique very familiar to geneticists: “standard DNA extraction, PCR, Sanger sequencing, alignment and analysis of a protein coding mitochondrial gene”. To achieve the goals of understanding both evolutionary relationships of sharks and rays and parasite host specificity ( where certain parasites associated only with one species), Dr. Naylor and his team obtained and analyzed samples from as many species as they could. The numbers are impressive- 56 of 57 known families of elasmobranchs were represented among the 4,283 samples from 305 species of sharks and 269 species of batoids. In other words, this study included approximately half of all known elasmobranch species, including many that had never been analyzed genetically before. Since 1986, when the project began, samples have been obtained in more than 50 countries, mostly through the team’s own field work!
Continue reading Genetics study reveals 79 potentially new species of sharks and rays: what does it mean for science and conservation?
By David Shiffman, on June 18th, 2012
Shark finning, one of the most wasteful, unsustainable, and inhumane methods of gathering food in the history of human civilization, has rightly become a hot topic in the marine conservation movement. However, there is a great deal of confusion among activists concerning this problem and the best way to solve it. Those of you who follow me on twitter have seen me point out numerous recent anti-finning “awareness campaigns” which feature photographs of sharks that have not actually been finned.
Shark finning does not mean removing the fins from a shark. This is really important and seems to be a source of some confusion- not every shark fin for sale in markets is the result of shark finning! Shark finning means removing the fins from a shark while still on the fishing vessel and dumping the rest of the shark overboard. This is a problem because its wasteful (less than 10% of the weight of a shark is used), because its easy to quickly overfish a population even from a small boat (fins don’t take up a lot of space on board), and because its almost impossible for managers to know how many of each species were harvested. As stated above, this practice is also shockingly inhumane, as the sharks are often still alive when they are dumped overboard.
Continue reading What shark finning means (and doesn’t mean): a primer and quiz
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