Please select your home edition
Edition
Zhik ZKG

New study shows age matters to Antarctic clams

by Paul B. Holland on 19 Apr 2013
Antarctic Clams British Antarctic Survey © http://www.antarctica.ac.uk
A new study of Antarctic clams reveals that age matters when it comes to adapting to the effects of climate change. The research provides new insight and understanding of the likely impact of predicted environmental change on future ocean biodiversity.

Reporting this week in the journal Global Change Biology scientists from British Antarctic Survey (BAS) and from Germany’s University of Kiel and the Alfred Wegener Institute reveal that when it comes to environmental change the reaction of Antarctic clams (laternula elliptica) – a long-lived and abundant species that lives in cold, oxygen-rich Antarctic waters – is different depending on how old the animal is.

The study showed that whilst young clams (average of three years old) try to move to a better area in the sea-bed sediments when they sense warmer temperature or reduced oxygen levels, the older (18 years old) more sedentary clams stay put. This has implications for future clam populations because it is the older animals that reproduce. Scientists anticipate that future oceans will be slightly warmer and contains less oxygen (a condition known as hypoxia).

Lead Author Dr Melody Clark of British Antarctic Survey said:

'Antarctic clams play a vital role in the ocean ecosystem. They draw down carbon into sea-bed sediments and circulate ocean nutrients. We know that they are extremely sensitive to their environment. Our study suggests that the numbers of clams that will survive a changing climate will reduce.

'The Polar Regions are the Earth’s early warning system and Antarctica is a great natural laboratory to study to future global change. These small and rather uncharismatic animals can tell us a lot about age and survival in a changing world – they are one of the ‘engines of the ocean’.'

Co-author, Eva Phillip, from the University of Kiel, says:

'The study shows that it is important to investigate different ages of a population to understand population wide changes and responses. In respect to Antarctic clams it has been indicated in previous studies that older individuals may suffer more severely in a changing environment and the new study corroborates this assumption. Only the investigation of population-wide effects makes it possible to draw conclusions for coastal ecosystems.'

Like humans, clams’ muscle mass decreases as they get older. This means they get more sedentary. So when changes are introduced into their habitat, the older clams tend to just sit it out until conditions revert back to normal.

Doris Abele of the Alfred Wegener Institute in Germany says:

'Our study shows that the physiological flexibility of young clams diminishes as they get older. However, the species has evolved in such a way that the fittest animals, that can tolerate life in an extreme environment, survive to reproduce into old age. Climatic change, affecting primarily the older clams, may interfere with this evolutionary strategy, with unpredictable consequences for ecosystems all around Antarctica.'

The research was funded by the Natural Environment Research Council, the German Research Foundation and the European Science British Antarctic Survey
Pacific Sailing School 660x82 1Hamilton Island LuxuryBIA 2016 Sydney Boat Show 660x82

Related Articles

Reducing weight aloft with composite backstays
Reducing weight aloft is one of the most cost effective ways of increasing your boat speed and performance. Reducing weight aloft is one of the most cost effective ways of increasing your boat speed and performance. Every kilogram you take out of the rig is roughly equivalent to 4kg added to the bottom of your keel!
Posted on 26 Jul
Bavaria STYLE 46 Australian Premiere at Sydney International Boat Show
For everyone who appreciates luxury on the water, the STYLE package is now available for the Cruiser 46 and Cruiser 51?. For everyone who appreciates luxury on the water, the STYLE package is now available for the Cruiser 46 and Cruiser 51?. Making the most of your time on board, be it with family or friends, is becoming more important. Yacht owners want certain levels of comfort and an onboard living experience coupled with versatility.
Posted on 26 Jul
What to look for when buying a modern lifejacket
There is no doubt that modern lifejacket design has changed considerably. There is no doubt that modern lifejacket design has changed considerably and one of the biggest drivers of this change has been due to personal ownership. Rather than crew relying on lifejackets being on-board a boat, they want to own their own lifejacket as part of their kit bag.
Posted on 25 Jul
The New Bavaria Cruiser 34 - you won't believe this is a 34' yacht!
The Sydney International Boat Show sees the World Premiere of the Bavaria Cruiser 34 - 2 Cabin version. The Sydney International Boat Show sees the World and Australian Premiere of the Bavaria Cruiser 34 - 2 Cabin version. The new Cruiser 34 offers more space and more comfort than ever before with a bigger cockpit, dual helms and ergonomically designed seating. This is the first time the entry level Bavaria cruiser has been offered in twin helm!
Posted on 19 Jul
Sydney International Boat Show – A pilgrimage for boaters
Connecting the two is a ferry service that also gives show visitors a bonus voyage across the magnificent Sydney Harbour The event is well known for delivering a comprehensive variety of products, across all boating sectors. Joining local visitors, the show also has a large number of guests from across the country as well as overseas, making it the ideal location for the marine industry to use as a base to launch new products and services.
Posted on 5 Jul
Navathome Australia brings RYA Theory to your door
The RYA Cruising Syllabus has been built up over years of best practice development in Sail and Power Boat skippering. The Royal Yachting Association Cruising Syllabus has been built up over years of best practice development in Sail and Power Boat skippering. Split into a theory and practical syllabus the training modules take you in steps from a Start Yachting orientation through to Yachtmaster for either power or sail.
Posted on 5 Jul
Free $US3,000 Carbon Vang with SouthernFurl boom orders in July
Southern Spars is giving a free carbon vang - valued at US$3,000 - with SouthernFurl in-boom furlers ordered in July Southern Spars is giving away a free carbon vang - valued at US$3,000 - with all of their SouthernFurl in-boom furlers ordered in July. Carbon gas vangs make a great addition to the furling boom package, though if you’d prefer to keep your existing one, Southern Spars will offer you a 5% discount on the price of your boom instead.
Posted on 29 Jun
Newport Bermuda Race - High Noon takes honours
As the Newport Bermuda Race fleet rushed to the finish line on Monday in the wake of the first-to-finish boat, As the Newport Bermuda Race fleet rushed to the finish line on Monday in the wake of the first-to-finish boat, the powerful 100-foot grand prix Comanche, to the surprise of many they were led by an unusual boat and crew. High Noon, at 41 feet, is fully 59 feet shorter than Comanche and tens of feet shorter than many other entries.
Posted on 22 Jun
WHO statement on Zika virus
The third meeting of the EC convened by the Director-General under IHR 2005 regarding microcephaly and Zika virus The third meeting of the Emergency Committee (EC) convened by the Director-General under the International Health Regulations (2005) (IHR 2005) regarding microcephaly, other neurological disorders and Zika virus was held by teleconference on 14 June 2016, from 13:00 to 17:15 Central European Time.
Posted on 16 Jun
Platino recovery - Family confirms that tug has made rendezvous
Reports in social media say a salvage tug has made a rendezvous with the Platino earlier than expected. Reports in social media by family and friends of Nick Saull, the crew member killed during a catastrophic incident abroad the 66ft yacht Platino say the salvage tug which left on Tuesday night has made the rendezvous earlier than expected. The Facebook report says the tug, Sea Pelican, arrived on Friday morning, the weather in the area has eased and with a more favorable outlook.
Posted on 16 Jun