Elmer Quispe-Salazar

Elmer Quispe-Salazar

Marine quantitative ecologist.
Fisheries science and stock assessment.
Spatio-temporal modelling.
Scientific computing in C++, R, Python and Julia.

Critical points of natural and anthropogenic pressures and responses in the state of the north–central anchovy stock in the pelagic system of the Peruvian Sea

Date:

Overview

This poster examines how the state of the north-central Peruvian anchovy stock responds to natural and fishing-related pressures in a highly variable pelagic ecosystem. The analysis focuses on critical points, non-linear responses, and potential thresholds associated with changes in biological, ecological, demographic, and spatial indicators of stock state.

Poster on critical points and stock-state responses of the north-central Peruvian anchovy

Scientific contribution

Small pelagic fish populations may respond non-linearly to environmental variability and fishing pressure. In the Peruvian upwelling ecosystem, changes in climate forcing, oceanographic conditions, habitat availability, fishing pressure, and population structure can generate abrupt changes rather than gradual responses.

The contribution develops a stock-state diagnostic perspective based on pressure-response relationships and uses the north-central Peruvian anchovy (Engraulis ringens) as an applied case study. The framework is intended to support ecosystem-informed assessment by identifying potential thresholds, warning signals, and state transitions relevant to adaptive management.

Authorship and presentation

Authors: Elmer Quispe-Salazar, Álvaro Recoba, and Jorge Tam.

Presentation status: Poster contribution presented by Álvaro Recoba.

Keywords: small pelagic fish; critical points; stock-state responses; natural pressures; fishing pressure; environmental variability; threshold dynamics; ecosystem approach to fisheries; adaptive management.

Citation

Quispe-Salazar, E., Recoba, A., & Tam, J. (2026). Critical points of natural and anthropogenic pressures and responses in the state of the north-central anchovy stock in the pelagic system of the Peruvian Sea [Poster presentation]. SPF-2026 International Symposium: Navigating Changes in Small Pelagic Fish and Forage Communities, La Paz, Baja California Sur, Mexico.

Public materials

See Multivariate indicators for fisheries and ecosystem assessment and Multidimensional state of the north-central Peruvian anchovy stock.