Unlike most sea stars, six-rayed sea star moms are VERY involved in their kids' lives, caressing and protecting their babies for months. When they're big enough, the youngsters venture out on their own to ruthlessly hunt down their tiny prey.
SUBSCRIBE to Deep Look! www.youtube.co...
Please join our community on Patreon! / deeplook
DEEP LOOK is an ultra-HD (4K) short video series created by KQED in San Francisco and presented by PBS Digital Studios. See the unseen at the very edge of our visible world. Explore big scientific mysteries by going incredibly small.
---
The California shoreline is home to the tiny six-rayed sea star. About the size of a bottle cap, these diminutive starfish have an unusually attentive style of raising their young.
“Most sea stars use a broadcast spawning method,” says Berenice Baca-Ceballos, a graduate student at San Francisco State University. Broadcast spawners release huge numbers of eggs and sperm directly into the water. The lucky ones meet and develop into larvae that grow up all on their own. Most never reach adulthood.
But mama six-rayed stars of the genus Leptasterias are different. “The mother sea star will sit on her eggs for about two to three months until her eggs develop, hatch, and grow into little juvenile sea stars,” says Baca-Ceballos. “She’s like a mother chicken. The female sea star sits on her eggs until the little baby sea stars, that look like delicate living snowflakes, are ready to adventure out.“
This style of holding on to their young as they develop is called brooding. While six-rayed sea stars have many fewer offspring than most sea stars, they spend more time taking care of their young.
“By protecting her young, the six-rayed star increases the chances that her babies will survive,” Baca- Ceballos says.
--- How do starfish move?
Starfish move using hydraulic pressure. They have a system of canals, called the water vascular system, which run through their bodies. The canals connect to a large number of tiny flexible tube feet that end in adhesive pads. A starfish contracts muscles to adjust the hydraulic pressure in the tube feet, allowing it to crawl along surfaces.
--- How do starfish eat?
Starfish are mostly carnivores. Many types of starfish eat shellfish like mussels, clams and snails. A starfish will use its numerous tube feet to slowly pry open its prey’s shell. Once it has opened the shell enough, the starfish will extend its stomach out through its mouth to digest its prey alive. Some types of starfish also eat small fish, plankton and detritus.
--- Do starfish have eyes?
Starfish usually have a simple eyespot at the tip of each arm. Also called ocelli, these eyespots can only sense light and dark.
---+ For more information:
The Cohen Lab at San Francisco State University studies six-rayed sea stars of the genus Leptasterias.
sarahcoh0.wixs...
---+ More great Deep Look episodes:
Ever Seen a Starfish Gallop? | Deep LooK
• Ever Seen a Starfish G...
Sea Urchins Pull Themselves Inside Out to Be Reborn | Deep Look
• Video
A Sand Dollar’s Breakfast Is Totally Metal | Deep Look
• A Sand Dollar's Breakf...
---+ Shoutout!
🏆Congratulations🏆 to the following fans on our Deep Look Community Tab for correctly answering our GIF challenge! The answer is "brachiolar arms" that are reabsorbed when they sea star's permanent arms emerge.
@mohammedyaser1357
@dumbbirdwayne
@nuzwo2723
@callystarizka-tata7892
@magicdolphin3090
---+ Thank you to our top Patreon supporters ($10+ per month)!
Kevin Sholar
Burt Humburg
Karen Reynolds
Daisuke Goto
Chris B Emrick
Companion Cube
Cristen Rasmussen
Laurel Przybylski
David Deshpande
Wade Tregaskis
Adam Cleaver
Kevin William Walker
hoxtom
Mark Jobes
El Samuels
Carrie Mukaida
Dot
Jessica Hiraoka
Noreen Herrington
H.M. Andrew
Louis O'Neill
J Schumacher
Drspaceman0
The Mighty X
Walter Tschinkel
Joan Klivans
R B
BulletproofFrog
Mehdi
Lily, Vinny, Izzy Altschuler
Jellyman
Levi Cai
Titania Juang
Roberta K Wright
Elizabeth Ann Ditz
SueEllen McCann
MrBeeMovie
STEPHANIE DOLE
Smoulder the Dragon
Hank Poppe
xkyoirre
KW
Jeremiah Sullivan
吳怡彰
wormy boi
Marco Narajos
---+ Follow Deep Look and KQED Science on social:
/ deeplookofficial
/ deeplook
Instagram: / kqedscience
Twitter: / kqedscience
---+ About KQED
KQED, an NPR and PBS member station in San Francisco, serves Northern California and beyond with a public-supported alternative to commercial TV, radio and web media.
Funding for Deep Look is provided in part by PBS Digital Studios and the members of KQED.
#starfish #seastar #deeplook
5 сен 2024
