Data from: Next-generation matrices for marine metapopulations: the case of sea lice and salmon farms

• Main Authors: Harrington, Peter D., Cantrell, Danielle L., Lewis, Mark A.
• Format: Dataset
• Language: unknown
• Published: Borealis 2023
• Subjects: next-generation matrix; Other; source-sink dynamic; metapopulaton; Sea lice; Salmon farms; marine systems; Canada; First Nations
• Online Access: https://search.dataone.org/view/sha256:92874254cc9b9b57c4a27ae2f9dbc163261eb5236f5cfac306d0a9aaef7fd1e6

AbstractClassifying habitat patches as sources or sinks and determining metapopulation persistence requires coupling connectivity between habitat patches with local demographic rates.  While methods to calculate sources, sinks, and metapopulation persistence exist for discrete-time models, there is no method that is consistent across modelling frameworks. In this paper, we show how next-generation matrices, originally popularized in epidemiology to calculate new infections after one generation, can be used in an ecological context to calculate sources and sinks as well as metapopulation persistence in marine metapopulations. To demonstrate the utility of the method, we construct a next-generation matrix for a network of sea lice populations on salmon farms in the Broughton Archipelago, BC, an intensive salmon farming region on the west coast of Canada where certain salmon farms are currently being removed under an agreement between local First Nations and the provincial government. The column sums of the next-generation matrix can determine if a habitat patch is a source or a sink and the spectral radius of the next-generation matrix can determine the persistence of the metapopulation. With respect to salmon farms in the Broughton Archipelago, we identify the salmon farms which are acting as the largest sources of sea lice and show that in this region, the most productive sea lice populations are also the most connected. The farms which are the largest sources of sea lice have not yet been removed from the Broughton Archipelago, and warming temperatures could lead to increased sea louse growth. Calculating sources, sinks and persistence in marine metapopulations using the next-generation matrix is biologically intuitive, mathematically equivalent to previous methods, and consistent across different modelling frameworks.