An Integrative Method for Characterizing Marine Habitat Features Associated With Predation: A Case Study on Juvenile Steller Sea Lions (Eumetopias jubatus)

Abstract

Characterizing the habitat associated with predation events can inform on predator-prey dynamics. Despite being evaluated extensively in terrestrial systems, quantifying and characterizing the role predation plays in upper trophic marine ecosystems is challenging due to the cryptic nature of pelagic predators and the difficulty of observing predatory behavior. We developed a multi-step method to characterize habitat associated with predation that integrates data from post-mortem pop-up style mortality transmitters, and data from traditional external tracking devices, both of which use the Argos satellite system. In our case study with juvenile Steller sea lions (SSL, Eumetopias jubatus) in the Gulf of Alaska, 20 mortality events were previously described, of which 18 were attributed to predation. The locations of 13 of these at-sea predation events with post-mortem tracking data were estimated, with spatial uncertainty calculated using movement-based approaches of backwards step-length and state-space modeling. We then generated a Mortality Occurrence Probability Distribution (MOPD), resampled points within the MOPD based on isopleth weighting, and extracted habitat variables (i.e., slope, depth, distance to haulout-rookery) associated with these locations. This final dataset represented "case" points (n = 115) in terms of predation and was compared to the habitat associated with "control" points (n = 1000), locations within juvenile SSL distribution in this region (i.e., population home range), in a resource-selection function (GAM). Predation events were associated with habitats characterized by greater depths and moderate distances from SSL haulouts and rookeries. This information enabled us to generate a risk-map for juvenile SSL in the Gulf of Alaska, spatially representing areas of high predation probability. Our study provides important information about threats to this vulnerable age-class, and establishes a novel approach to characterizing risk in marine ecosystems that can be applied to other management and ecosystem concerns.

Inter‐ and intrasex habitat partitioning in the highly dimorphic southern elephant seal

“…Elephant seals have several predators, including killer whales ( Orca orcinus ) and sleeper sharks ( Somniosus antarcticus ) (van den Hoff & Morrice, 2008), which are concentrated in shelf habitats (Richard et al., 2017; Tixier et al., 2019). Using shelf habitats would therefore expose male elephant seals to greater predation risk (Bishop et al., 2020). Males have highly skewed reproductive outputs (i.e., only a very few males become beachmasters, but those that do sire a very large number of offspring (Le Boeuf, 1974)) and they may adopt the strategy of foraging on the shelf, despite higher predation risk, as it means they can attain larger body size rapidly and better compete for access to females on the breeding islands.…”

Seascapes of fear and competition shape regional seabird movement ecology

“…Indeed, so far only 4.3% (10/230, ISI Web of Science April 2021) of publications which addressed the LoF 2 , 5 did so in a marine context. Most such studies focused on coastal reef habitats 12 , 13 , to the neglect of pelagic ecosystems 3 , 14 and large spatial scales 11 , 15 . We fill these major gaps, by providing, to the best of our knowledge, the first evidence for a SoF in an upwelling ecosystem, at a regional scale.…”