My location Print Close 此页面无法正确加载 Google 地图。您是否拥有此网站？确定 Global Maritime, January 17, 2014 zoom Beacon Holdings Group has ordered a harsh environment semi-submersible GM4-D rig from Yantai CIMC Raffles. They have also secured an option to build a second rig from the shipyard.The rig they have ordered has been given the name Beacon Atlantic, and planned delivery is the fourth quarter of 2016. Beacon Atlantic will be built using the GM4-D-design cooperating with the shipyard and the designer Global Maritime.The rig will be built to operate in water depths of up to 500 meters and on drilling wells down to 8000 meters. It will be equipped with NOV-drilling package, DP3 and an 8-point mooring system.The unit is designed to be able to operate in harsh weather conditions in the North Sea, Arctic environments and in the Barents Sea. It is built after NMA, NORSK and PSA-standard and will be classed by DNV.Beacon Atlantic is the second semi-submersible rig with GM4-design contracted to CIMC Raffles. The first one is North Dragon, currently under construction.The shipyard confirmed in a release that it is the company ordering the North Dragon, North Sea Rig AS who will lead both rig projects.
Linking extreme interannual changes in prey availability to foraging behaviour and breeding investment in a marine predator, the macaroni penguin
Understanding the mechanisms that link prey availability to predator behaviour and population change is central to projecting how a species may respond to future environmental pressures. We documented the behavioural responses and breeding investment of macaroni penguins Eudyptes chrysolophus across five breeding seasons where local prey density changed by five-fold; from very low to highly abundant. When prey availability was low, foraging trips were significantly longer and extended overnight. Birds also foraged farther from the colony, potentially in order to reach more distant foraging grounds and allow for increased search times. These extended foraging trips were also linked to a marked decrease in fledgling weights, most likely associated with reduced rates of provisioning. Furthermore, by comparing our results with previous work on this population, it appears that lowered first-year survival rates associated, at least partially, with fledging masses were also evident for this cohort. This study integrates a unique set of prey density, predator behaviour and predator breeding investment data to highlight a possible behavioural mechanism linking perturbations in prey availability to population demography.