Overfishing is the main threat to sustainable fisheries. To ensure sustainability, we need a solid understanding of ecosystem-level responses to fisheries management and systems to mitigate competitive fishing. We tackle this problem through ecological (e.g., modeling population dynamics) and socioeconomic (e.g., decision theory) approaches. 

Keywords: Ecosystem-based fisheries management, maximum sustainable yields, co-management

References

• Takashina, N., Understanding the impact of selective fishery and bycatch on stock dynamics, Natural Resource Modeling, 37:e12403 (2024) 

• Takashina, N. & T. Tanaka, Spillover-mediated harvesting competition: effects of fishing ground configuration on fisheries targeting transboundary species, Journal of Environmental Management, 317:115360 (2022) 

The establishment of terrestrial and marine protected areas is increasing rapidly around the world. This seems good for conservation, but is it always good for society? Establishing a protected area is often very costly and requires a cost-effective strategy for its establishment. In addition to the benefits of protected areas, we also seek to understand effective ways to establish them.

Keywords: Spatial conservation planning, SLOSS, 30by30

Reference

• Erm, P., A. Balmford, N. C. Krueck, N. Takashina, & M. H. Holden, Marine protected areas can benefit biodiversity even when bycatch species only partially overlap fisheries, Journal of Applied Ecology, 61:621-632 (2024) 

• Takashina, N. & B. Kusumoto, A perspective on biodiversity data and applications for spatio-temporally robust spatial planning for area-based conservation, Discover Sustainability, 4:1 (2023) 

Bending the curve of global biodiversity loss is a pressing issue in today's society. A comprehensive understanding of global biodiversity is necessary to develop effective conservation strategies. We employ our knowledge of community ecology and macroecology to develop ecosystem models and study the effects of human activities on a global scale and effective conservation management approaches.

Keywords: Species area relationship, species geographic range, urbanization

References

• Fung, T., N. Takashina, & R. A. Chisholm, Mechanistic partitioning of species richness in diverse tropical forest tree communities with immigration and temporal environmental stochasticity, Journal of Ecology, 111:2441-2456 (2023) 

• Takashina, N.,  M.J. Plank, C.N. Jenkins & E.P. Economo, Species-range size distributions: integrating the effects of speciation, transformation, and extinction, Ecology and Evolution, 12:e8341 (2022)

• Takashina, N., B. Kusumoto, Y. Kubota & E.P. Economo, A geometric approach to scaling individual distributions to macroecological patterns, Journal of Theoretical Biology, 461:170-188 (2019)

We are also interested in a wide range of topics in theoretical ecology, such as ecosystem/population dynamics at various temporal, spatial, and ecological focal scales (e.g., age, role, and species), and ecological sampling theory.

Keywords: Population dynamics, age/size structure, spatially explicit model

References

• Takashina, N., Linking multi-level population dynamics: state, role, and population, PeerJ, 10:e13315 (2022) 

• Takashina, N., M. Beger, B. Kusumoto, S. Rathnayake & H.P. Possingham, A theory for ecological survey methods to map individual distributions, Theoretical Ecology, 11:213-223 (2018)