High specialization and limited structural change in plant-herbivore networks along a successional chronosequence in tropical montane forest.

0496417 - BC 2020 RIV US eng J - Journal Article
Redmond, Conor - Auga, J. - Gewa, B. - Segar, Simon Tristram - Miller, S. E. - Molem, K. - Weiblen, G. D. - Butterill, Philip T. - Maiyah, G. - Hood, A. S. C. - Volf, Martin - Jorge, L. R. - Basset, Yves - Novotný, Vojtěch
High specialization and limited structural change in plant-herbivore networks along a successional chronosequence in tropical montane forest.
Ecography. Roč. 42, č. 1 (2019), s. 162-172. ISSN 0906-7590. E-ISSN 1600-0587
R&D Projects: GA ČR(CZ) GA17-23862S
EU Projects: European Commission(XE) 669609 - Diversity6continents
Grant - others:GA JU(CZ) 152/2016/P
Institutional support: RVO:60077344
Keywords : ecological gradients * food webs * herbivory
OECD category: Ecology
Impact factor: 6.455, year: 2019
Method of publishing: Open access
https://onlinelibrary.wiley.com/doi/pdfdirect/10.1111/ecog.03849

Secondary succession is well-understood, to the point of being predictable for plant communities, but the successional changes in plant-herbivore interactions remains poorly explored. This is particularly true for tropical forests despite the increasing importance of early successional stages in tropical landscapes. Deriving expectations from successional theory, we examine properties of plant-herbivore interaction networks while accounting for host phylogenetic structure along a succession chronosequence in montane rainforest in Papua New Guinea. We present one of the most comprehensive successional investigations of interaction networks, equating to > 40 person years of field sampling, and one of the few focused on montane tropical forests. We use a series of nine 0.2 ha forest plots across young secondary, mature secondary and primary montane forest, sampled almost completely for woody plants and larval leaf chewers (Lepidoptera) using forest felling. These networks comprised of 12 357 plant-herbivore interactions and were analysed using quantitative network metrics, a phylogenetically controlled host-use index and a qualitative network beta diversity measure. Network structural changes were low and specialisation metrics surprisingly similar throughout succession, despite high network beta diversity. Herbivore abundance was greatest in the earliest stages, and hosts here had more species-rich herbivore assemblages, presumably reflecting higher palatability due to lower defensive investment. All herbivore communities were highly specialised, using a phylogenetically narrow set of hosts, while host phylogenetic diversity itself decreased throughout the chronosequence. Relatively high phylogenetic diversity, and thus high diversity of plant defenses, in early succession forest may result in herbivores feeding on fewer hosts than expected. Successional theory, derived primarily from temperate systems, is limited in predicting tropical host-herbivore interactions.
Permanent Link: http://hdl.handle.net/11104/0302090