Density dependent Resource Budget Model for alternate bearing

JOURNAL OF THEORETICAL BIOLOGY

卷:509

Article

Esmaeili, Shadisadat¹  Hastings, Alan^1,4  Abbott, Karen²  Machta, Jonathan^3,4  Nareddy, Vahini Reddy³ 

[1] Univ Calif Davis, Dept Environm Sci & Policy, One Shields Ave, Davis, CA 95616 USA

[2] Case Western Reserve Univ, Dept Biol, 10900 Euclid Ave, Cleveland, OH 44106 USA

[3] Univ Massachusetts, Phys Dept, Amherst, MA 01003 USA

[4] Santa Fe Inst, 1399 Hyde Pk Rd, Santa Fe, NM 87501 USA

关键词: Masting;    Biennial bearing;    Variable fruit production;    Synchrony;   

DOI  :  10.1016/j.jtbi.2020.110498

来源: Elsevier

【 摘 要 】

Alternate bearing, seen in many types of plants, is the variable yield with a strongly biennial pattern. In this paper, we introduce a new model for alternate bearing behavior. Similar to the well-known Resource Budget Model, our model is based on the balance between photosynthesis or other limiting resource accumulation and reproduction processes. We consider two novel features with our model, 1) the existence of a finite capacity in the tree's resource reservoir and 2) the possibility of having low (but non-zero) yield when the tree's resource level is low. We achieve the former using a density dependent resource accumulation function, and the latter by removing the concept of the well-defined threshold used in the Resource Budget Model. At the level of an individual tree, our model has a stable two-cycle solution, which is suitable to model plants in which the alternate bearing behavior is pronounced. We incorporate environmental stochasticity by adding two uncorrelated noise terms to the parameters of the model associated with the nutrient accumulation and reproduction processes. Furthermore, we examine the model's behavior on a system of two coupled trees with direct coupling. Unlike the coupled Resource Budget Model, for which the only stable solution is the out-of-phase solution, our model with direct coupling has stable in-phase period-2 solutions. This suggests that our model might serve to explain spatial synchrony on a larger scale. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

Free