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:3/27/2017)... N.Y. , March 27, 2017  Catholic ... Information and Management Systems Society (HIMSS) Analytics for ... EMR Adoption Model sm . In addition, CHS ... of U.S. hospitals using an electronic medical record ... for its high level of EMR usage in ...
(Date:3/23/2017)... Mar. 23, 2017 Research and Markets has ... Analysis & Trends - Industry Forecast to 2025" report to ... ... a CAGR of around 8.8% over the next decade to reach ... analyzes the market estimates and forecasts for all the given segments ...
(Date:3/20/2017)... March 20, 2017 At this year,s CeBIT Chancellor ... biometrics manufacturer DERMALOG. The Chancellor came to the DERMALOG stand together with ... this year,s CeBIT partner country. At the largest German biometrics company the ... fingerprint, face and iris recognition as well as DERMALOG´s multi-biometrics system.   ... ...
Breaking Biology News(10 mins):
(Date:5/19/2017)... , ... May 19, 2017 , ... ... Proof-of-Concept Program. Academic researchers with technologies ripe for commercialization, and who are ... and Delaware, are encouraged to submit proposals. QED, now in its tenth round, ...
(Date:5/18/2017)... ... May 18, 2017 , ... Lajollacooks4u ... Cooking Challenge is a two-hour team-building package designed for groups of 10-30 people. ... Jodi Abel, which include items, such as Blackened Shrimp with Edamame Salad, Pizza ...
(Date:5/18/2017)... ... May 17, 2017 , ... NDA Partners Chairman Carl ... CEO of Eurofins Advantar Laboratories and President of Pharmaceutical Development Business Unit of Cardinal ... at Eurofins and Cardinal Health, he was former Chief Operating Officer at Anaborex, Senior ...
(Date:5/18/2017)... ... May 17, 2017 , ... Cognition ... and commercialization, has just released version 9.0 of the Cognition Cockpit platform. , ... of Cockpit,” says David Cronin, CEO of Cognition. “We’re thrilled to finally be ...
Breaking Biology Technology: