HAL Id: hal-02800002
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Island river levelling: a favorable situation to explore
ground beetles (Coleoptera : Carabidae) ability to
recolonize pioneer riparian habitats
Olivier Denux, Emmanuelle Dauffy-Richard, Jean-Pierre Rossi, Sylvie
Augustin
To cite this version:
Olivier Denux, Emmanuelle Dauffy-Richard, Jean-Pierre Rossi, Sylvie Augustin. Island river levelling:
a favorable situation to explore ground beetles (Coleoptera : Carabidae) ability to recolonize pioneer
riparian habitats. 10. European Congress of Entomology, Aug 2014, York, United Kingdom. 1p.,
2014. �hal-02800002�
Island river levelling: a favorable situation to explore ground beetles
(Coleoptera : Carabidae) ability to recolonize pioneer riparian habitats
Olivier Denux
1, Emmanuelle Dauffy-Richard(†)
2, Jean-Pierre Rossi
3, Sylvie Augustin
11: INRA Orléans, UR0633 Zoologie Forestière, France 2: IRSTEA Nogent-sur-Vernisson, UR EFNO, France 3: INRA Montpellier, UMR CBGP, France
10th European Congress of Entomology. York, United Kingdom, 3 - 8 August 2014
The Loire, the last wild river in Western Europe, undergoes recurrent maintenance operations of bed to improve flow and to avoid reduction of the main stem. In autumn 2012, the territorial collectivities carried out levelling of one island in the Natural Reserve of Saint-Mesmin (Centre region, France). We took advantage of this work to launch a long term survey of the island recolonization by plants, birds, beavers and insects. We report here the impact on insect populations taking ground beetles (Coleoptera : Carabidae) as a model. We compared species (communities) before and just after the levelling.
Introduction
Species richness and abundance
We identified 36 species in 2012 (869 individuals) and 17 species in 2013 (1022 individuals). Only 15 species were found again after levelling. For each habitat, the specific richness decreased sharply after levelling.
The pioneer island habitats have an important species richness. A decrease of the species richness was observed just after levelling, however this decline concerned infrequent species (1 to 5 individuals) and may be explained by a lower sample intensity in 2013 as compared to 2012. The predominant species in 2012 were also abundant after levelling works.
Three species, Chlaeniellus vestitus, Cicindela hybrida and Princidium punctulatum, typical of riparian communities on Loire river and characteristic of wet gravel, dry sand and mudflat were found before and just after levelling.
PARIS Loire river
Study site
Species richness
We report the observed species richness and its bootstrap estimator with the associated standard error in each pioneer habitats (Colwell & Coddington, 1994).
Indicator species
We explored the indicator value of each species with regards to the habitats surveyed in 2012 by means of the IndVal index developed by Dufrêne & Legendre (1997).
We present here IndVal values >0.25 associated to probabilities <0.001.
Habitats
In 2012, before levelling, we identified 8 pioneer habitats on the island Loire valley. After levelling, 4 pioneer habitats were found and selected on the island.
Ground beetles sampling
We used pitfall traps to sample ground beetles between June and September 2012 – 2013 in the habitats under study.
Cracked soil
Wet gravel Poplar coppice
Dry sand Dry gravel Mudflat
Grassland Wet sand
Habitats found after levelling
The species absent in 2013 were occasionally encountered before levelling. The ripirian species Princidium punctulatum and Lionychus quadrillum were both dominant before and after levelling. 0 10 20 30 40 50 60 70 80 90 R e la ti v e a b u n d a n c e ( % ) 2012 2013
Indicator species
We identified 9 characteristic species of different habitats before levelling in 2012.
Observed richness Corrected richness
Analyses
Methods
Results
Conclusions
References : Colwell, R.K. and J.A. Coddington, 1994. Estimating terrestrial biodiversity through extrapolation. Philosophical Transactions of the Royal Society of London. Series B-Biological Sciences. 345 :101-118. Dufrêne M. & Legendre P., 1997. Species assemblages and indicator species: the need for a flexible asymetrical approach. Ecological Monographs 67 : 345-366.
Acknowledgments : We thank Aminata NDiaye and Vanessa Imbault for there technical asistance. This study was supported by EU FEDER and Centre region.
2012 2013 2012 - before levelling 2013 - after levelling 2012 2013 2012 - before levelling 2013 - after levelling Cicindela hybrida Dry sand
Chlaeniellus vestitus Emphanes azurescens
Wet gravel
Princidium punctulatum
Mudflat
Europhilus micans Poecilus cupreus Agonum permoestum Amara similata Oxydromus tetracolus Poplar coppice
Levelling works
