Spatiotemporal dynamics of insect diversity in tropical seasonal forests is linked to season and elevation, a case from northern Thailand

Digital Gems > Biodiversity Library of Southeast Asia

Language

English

Creator

Plant, A. R.
Bickel, D. J.
Chatelain, P.
Hauser, M.
Le Cesne, M.
Surin, C.
Saokhod, R.
Nama, S.
Soulier-Perkins, A.
Daugeron, C.
Srisuka, W.

Source Title

The Raffles Bulletin of Zoology

Publication date

2018/06/27

Publisher

Dept. of Zoology, National University of Singapore, Singapore

Page

382–393

Content Type

Journal Article

Object Type

Text

Terms of Use

Open Access

Access Status

Open

Repository

NUS Libraries

Start File Page

382

End File Page

393

Volume

66

Issue

2

Call Number

QL319 NMB

Subject

Homoptera -- Thailand

Keyword

Auchenorrhyncha
Diptera
diversity
insect
spatiotemporal dynamics
seasonality
tropical seasonal forest

Abstract

Seasonal forests with alternating wet and dry seasons are geographically predominant in the tropics but little is known of the spatiotemporal dynamics of the megadiverse insect communities inhabiting them. We studied variation in diversity and abundance parameters of two taxonomically and functionally distinct insect orders, Diptera and Auchenorrhyncha throughout 12 months across a 2,100 m elevation gradient in seasonal forests in northern Thailand. The interactions of space (elevation) and time (successive months of the year) on species richness, abundance, evenness and local community turnover were interpreted on spatiotemporal grids. We found that: (1) The spatiotemporal dynamics of diversity parameters are taxon-dependent. (2) Diversity of Diptera and Auchenorrhyncha broadly correlates with monsoon rains despite taxonomic and functional dissimilarity. (3) Peak diversity and abundance of Diptera and Auchenorrhyncha occurred at different elevations and for different durations during the wet season but with bimodal peaks coinciding with early- and late-monsoon periods. (4) Species-rich early-monsoon assemblages had greater evenness than relatively depauperate late-monsoon assemblages. (5) Higher elevation assemblages have greater temporal stability suggesting that they are less seasonally constrained than lowelevation assemblages; they had proportionally more species with longer activity periods. Our results emphasise that seasonality is an under-recognised variable in insect diversity studies and since diversity and its structure are closely linked to climatic seasonality in globally extensive tropical seasonal forests, any assessment of global biodiversity by extrapolation from local and regional measurements requires that seasonal patterns be recognised.

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