A bioenergetics model for estimating prey consumption by an Adelie penguin population in East Antarctica

作者：Southwell Darren^*; Emmerson Louise; Forcada Jaume; Southwell Colin

来源：Marine Ecology Progress Series, 2015, 526: 183-197.

DOI：10.3354/meps11182

• Southern Ocean
• Predator-prey
• Uncertainty
• Krill
• Harvesting
• Fisheries

Quantifying prey consumption by top predators is a crucial component of ecosystem-based management in the Southern Ocean. In this study, we developed a bioenergetics model to estimate prey consumption by a top predator, the Adelie penguin Pygoscelis adeliae. Our model predicts prey consumption throughout the breeding season and incorporates uncertainty in model parameters using Monte Carlo simulation. The model was parameterized with data obtained at Bechervaise Island, the site of a long-term monitoring program in East Antarctica. We parameterized the model (1) using 13 yr of penguin population data, (2) for a year in which penguins successfully reared their chicks (2001-2002) and (3) for a year with low breeding success (1998-1999). Daily per capita energy consumption during the breeding season averaged 4269 kJ d(-1) (95% CI: 4187-4352 kJ d(-1)) and 4684 kJ d(-1) (95% CI: 4596-4771 kJ d(-1)) for males and females, respectively. Over the entire breeding season a male breeder consumes 470 MJ (95% CI: 461-479 MJ) compared to 515 MJ (95% CI: 506-525 MJ) for a female. On average, the Bechervaise Island population of 1836 breeding pairs consumes 16 447 MJ d(-1) which amounts to 1 809 224 MJ during the breeding season. On the basis of variable breeding success and the proportion of krill and fish in their diet, we estimate that this population consumes 78 to 406 t of krill and 4 to 46 t of fish each breeding season. Our results demonstrate clear periods of peak consumption associated with the penguins' breeding cycle.

• 出版日期2015-4-22
• 单位British Antarctic Survey