STARFISH WITH BABIES, BROODING BEHAVIOR REVEALED
This motherly starfish is taking care of her starbabies. Some starfish species, such as this one Diplasterias brandti, brood and carry their babies until they are ready to leave the nest, just like some vertebrate species.
SEVERAL different species of sea stars brood. Almost all of them are either cold-water species, living in the deep-sea or at the poles. Sometimes brooding is in temperate water species.. But typically not in the tropics.
Brooding also takes different forms. The oral ‘mouth’ or gastric brooding mode is but one kind. Here is Diplasterias from the Antarctic! MANY starfish in the Antarctic brood juvenile starfish!
- Photo: Smithsonian NMNH USARP
Dolphins Talk to Each Other Using Personal Names
Scientists at the Univ. of St Andrews have shown that bottlenose dolphins can use copying of signature whistles as a way of addressing or labeling animals on an individual basis.
The research was carried out by marine biologists Stephanie King and Vincent Janik who conducted sound playback experiments with wild bottlenose dolphins on the east coast of Scotland.
Read more: www.laboratoryequipment.com/news/2013/07/dolphins-talk-each-other-using-personal-names
DNA Sheds Light on Rare Killer Whale Type
by Megan Gannon
Scientists have long suspected that the killer whale, Orcinus orca, may actually be four different species or subspecies based of subtle differences in appearance and variations in behavior. The rarest of them all is known as type D. These fat-headed orcas, marked by tiny white patches around their eyes, were only recently observed in the wild, some 50 years after they were first identified in photographs from a mass stranding in New Zealand.
The skeleton of one of the type D whales that washed ashore in 1955 ended up at a museum in Wellington. In a new study, scientists analyzed DNA from the bones, showing, yes, type D is likely a distinct subspecies or species. The research, detailed in the journal Polar Biology, also suggests type D diverged from other killer whales about 390,000 years ago, making it the second oldest orca type…
(read more: Live Science) (image: Shutterstock)
The Sea’s Strangest Square Mile
Lightning-quick eels! Coral-colored, pregnant frogfish stuffing their bellies with wriggling prey! Baby cuttlefish!! BABY CUTTLEFISH!!!
Noctilucas scintillans- a bioluminescent dinoflagellate also called the sea sparkle.
Because they spend so much time in remote waters, and don’t survive in captivity, great white sharks are deeply mysterious creatures. But over the last ten years, biologists have been able to track them using electronic tags which record their position and depth, and the ocean temperature.
On the face of it, that information can’t tell you what the sharks are actually doing. But Salvador Jorgensen of the Monterey Bay Aquarium in Monterey, California, and colleagues have developed a new statistical analysis that picks out patterns of behaviour from the tagging data.
It seems to confirm earlier suggestions that the sharks have a breeding ground in the east Pacific. What’s more, it suggests that the males go there to show off side-by-side in front of the choosy females – cattle-market style.
Watch helplessly as this mussel is slowly & inexorably consumed by a sea star. Oh yeah, you’re watching from inside the shell.
This is so cool! You might not know this about sea stars, but certain species have the ability to invert a portion of their stomach and digest their prey from outside their body. If you’re an invertebrate, you can’t exactly crack open a shell the way a bird can.
This sea star pulls open the mussel shell slightly, inserts its stomach and releases a flood of digestive enzymes that dissolve its prey from the inside. You can watch that happen, sped up in the video above.
No word on whether the sea star also releases a white wine/butter sauce.
(via Deep Sea News)