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Stable coexistence in a field-calibrated individual-based model of mangrove forest dynamics caused by inter-specific crown plasticity
Grueters, U.; Ibrahim, M.R.; Schmidt, H.; Tiebel, K.; Horn, H.; Pranchai, A.; Vovides, A.G.; Vogt, J.; Otero, V.; Satyanarayana, B.; Dahdouh-Guebas, F. (2021). Stable coexistence in a field-calibrated individual-based model of mangrove forest dynamics caused by inter-specific crown plasticity. Forests 12(7): 955. https://dx.doi.org/10.3390/f12070955
In: Forests. MDPI: Basel. e-ISSN 1999-4907
Peer reviewed article  
Available in  Authors 
Author keywords
    individual-based model; mangrove forest; red mangrove; crown plasticity; classical competition theory; resource competition theory; local interaction; local seed dispersal
Authors  Top 
  • Grueters, U.
  • Ibrahim, M.R.
  • Schmidt, H.
  • Tiebel, K.
  • Horn, H.
  • Pranchai, A.
  • Vovides, A.G.
  • Vogt, J.
  • Otero, V.
  • Satyanarayana, B.
  • Dahdouh-Guebas, F., more
Abstract
    In this theoretical study, we apply MesoFON, a field-calibrated individual-based model of mangrove forest dynamics, and its Lotka–Volterra interpretations to address two questions: (a) Do the dynamics of two identical red mangrove species that compete for light resources and avoid inter-specific competition by lateral crown displacement follow the predictions of classical competition theory or resource competition theory? (b) Which mechanisms drive the dynamics in the presence of inter-specific crown plasticity when local competition is combined with global or with localized seed dispersal? (3) In qualitative support of classical competition theory, the two species can stably coexist within MesoFON. However, the total standing stock at equilibrium matched the carrying capacity of the single species. Therefore, a “non-overyielding” Lotka–Volterra model rather than the classic one approximated best the observed behavior. Mechanistically, inter-specific crown plasticity moved heterospecific trees apart and pushed conspecifics together. Despite local competition, the community exhibited -field dynamics with global dispersal. In comparison, localized dispersal slowed down the dynamics by diminishing the strength of intra-/inter-specific competition and their difference due to a restriction in the competitive race to the -field that prevails between conspecific clusters. (4) As the outcome in field-calibrated IBMs is mediated by the competition for resources, we conclude that classical competition mechanisms can override those of resource competition, and more species are likely to successfully coexist within communities.
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