Navigation Links
Vital ocean prey play active role in environment

Although Antarctic krill (Euphausia superba) are one of the best-studied organisms of the open sea, key aspects of their life cycle have remained murky.

Understanding krill is important because they are vital prey for fish, birds, and marine mammals, yet they are vulnerable to fishing pressure and environmental change. In the February 2006 issue of BioScience, the monthly journal of the American Institute of Biological Sciences, Stephen Nicol of the Australian Antarctic Division presents a new conceptual model of the species' life history that emphasizes krill's active role in exploiting a highly seasonal environment.

Nicol's model separates the species into different life stages: larvae, juveniles, gravid females, and other adults. These groups are believed to remain geographically separate. In summer, adults remain close to the edge of the continental shelf, which allows them access to open-water food supplies. Females carrying eggs move offshore to deep water to spawn, where the embryos sink. The embryos hatch into free-swimming larvae at depth, then swim upward over the course of several weeks. The larvae are at this stage dependent on microorganisms found on the underside of sea ice for food, and as they grow they drift with pack ice. After they metamorphose in late winter and early spring, the juveniles move with the currents back to inshore waters. In summer, the juveniles are found inshore of the adults. The life cycle thus keeps krill in younger stages separate from adults, which reduces competition for food and lessens the chance that adults will prey on younger stages. Further studies of krill can lead to an improved picture of the Southern Ocean ecosystem, Nicol writes.


'"/>

Source:American Institute of Biological Sciences


Page: 1

Related biology news :

1. Vital step in cellular migration described by UCSD medical researchers
2. NASA study finds snow melt causes large ocean plant blooms
3. Anammox bacteria produce nitrogen gas in oceans snackbar
4. Elephant seal pups suffer from ocean warming
5. Currents could disrupt ocean food chain
6. Scientists discover global pattern of big fish diversity in open oceans
7. Microbe has huge role in ocean life, carbon cycle
8. Genetics links whale to two different ocean basins
9. Climate change will affect carbon sequestration in oceans, model shows
10. Asleep in the deep: Model helps assess ocean-injection strategy for combating greenhouse effect
11. Understanding the oceans microbes is key to the Earths future
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/2/2016)... 2, 2016 The Department of Transport ... the 44 million US Dollar project, for the , ... including Personalization, Enrolment, and IT Infrastructure , to ... production and implementation of Identity Management Solutions. Numerous renowned international ... Decatur was selected for the most compliant ...
(Date:6/1/2016)... NEW YORK , June 1, 2016 ... Biometric Technology in Election Administration and Criminal Identification to ... According to a recently released TechSci Research report, " ... Sector, By Region, Competition Forecast and Opportunities, 2011 - ... $ 24.8 billion by 2021, on account of growing ...
(Date:5/16/2016)... --  EyeLock LLC , a market leader of iris-based ... IoT Center of Excellence in Austin, Texas ... embedded iris biometric applications. EyeLock,s iris authentication ... with unmatched biometric accuracy, making it the most proven ... platform uses video technology to deliver a fast and ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... /PRNewswire/ - BIOREM Inc. (TSX-V: BRM) ("Biorem" or "the Company") ... shareholders, Clean Technology Fund I, LP and Clean Technology ... based venture capital funds which together hold approximately 59% ... diluted, as converted basis), that they have entered into ... holdings in Biorem to TUS Holdings Co. Ltd. ("TUS") ...
(Date:6/27/2016)... ... June 27, 2016 , ... Rolf K. Hoffmann, former senior ... the University of North Carolina Kenan-Flagler Business School effective June 27. ... Kenan-Flagler, with a focus on the school’s international efforts, leading classes and participating ...
(Date:6/24/2016)... ... , ... While the majority of commercial spectrophotometers and fluorometers use the z-dimension ... are higher end machines that use the more unconventional z-dimension of 20mm. Z-dimension ... bottom of the cuvette holder. , FireflySci has developed several Agilent flow cell ...
(Date:6/23/2016)... /PRNewswire/ - FACIT has announced the creation of ... company, Propellon Therapeutics Inc. ("Propellon" or "the Company"), ... portfolio of first-in-class WDR5 inhibitors for the treatment ... represent an exciting class of therapies, possessing the ... cancer patients. Substantial advances have been achieved with ...
Breaking Biology Technology: