no code implementations • 15 Nov 2023 • Shirin Panahi, Younghae Do, Alan Hastings, Ying-Cheng Lai
In an ecosystem, environmental changes as a result of natural and human processes can cause some key parameters of the system to change with time.
no code implementations • 12 Jun 2023 • Eric Forgoston, Sarah Day, Peter C. de Ruiter, Arjen Doelman, Nienke Hartemink, Alan Hastings, Lia Hemerik, Alexandru Hening, Josef Hofbauer, Sonia Kefi, David A. Kessler, Toni Klauschies, Christian Kuehn, Xiaoxiao Li, John C. Moore, Elly Morrien, Anje-Margriet Neutel, Jelena Pantel, Sebastian J. Schreiber, Leah B. Shaw, Nadav Shnerb, Eric Siero, Laura S. Storch, Michael A. S. Thorne, Ingrid van de Leemput, Ellen van Velzen, Els Weinans
From 08-12 August, 2022, 32 individuals participated in a workshop, Stability and Fluctuations in Complex Ecological Systems, at the Lorentz Center, located in Leiden, The Netherlands.
no code implementations • 20 Jan 2022 • Evan Johnson, Alan Hastings
Ecologists have put forward many explanations for coexistence, but these are only partial explanations; nature is complex, so it is reasonable to assume that in any given ecological community, multiple mechanisms of coexistence are operating at the same time.
1 code implementation • 20 Jan 2022 • Evan Johnson, Alan Hastings
This can be accomplished in three steps: 1) relating the construct of coexistence to invasion growth rates, 2) mathematically partitioning the invasion growth rates into coexistence mechanisms (i. e., classes of explanations for coexistence), and 3) relating coexistence mechanisms to simple explanations for coexistence.
1 code implementation • 18 Jan 2022 • Evan Johnson, Alan Hastings
Our approach focuses on dividing one of the key conditions for the storage effect, covariance between environment and competition, into two pieces, namely that there must be a causal relationship between environment and competition, and that the effects of the environment do not change too quickly.
1 code implementation • 18 Jan 2022 • Evan C. Johnson, Oscar Godoy, Alan Hastings
Like many complex ecological theories, the storage effect is often used as an explanation for observed coexistence on the basis of heuristic understanding, rather than careful application of a detailed model.
1 code implementation • 17 Jan 2022 • Evan Johnson, Alan Hastings
Here, using theoretical arguments and case studies, we compare four such methods for calculating coexistence mechanisms: 1) Scaling factors, the traditional approach where resident growth rates are scaled by a measure of relative sensitivity to competition, obtained by solving a system of linear equations; 2) The simple comparison, which gives equal weight to all resident species; 3) Speed conversion factors, a novel method in which resident growth rates are scaled by a ratio of generation times, and; 4) The invader-invader comparison, another novel method in which a focal species is compared to itself at high vs. low density.
no code implementations • 11 Jan 2022 • Jorge Arroyo-Esquivel, Alan Hastings, Marissa L Baskett
In this work, we analyze the potential for long transients in a model for a consumer-resource system in which the resource exhibits group defense and reproduces in discrete reproductive pulses.
no code implementations • 20 Nov 2020 • Huawei Fan, Ling-Wei Kong, Xingang Wang, Alan Hastings, Ying-Cheng Lai
Transients are fundamental to ecological systems with significant implications to management, conservation, and biological control.