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Hydrobiologia 716, 75-85 Hydrobiologia Seasonal changes in caddis larvae assemblages in river-floodplain habitats along a hydrological connectivity gradient --Manuscript Draft-- Manuscript Number: HYDR-D-12-07880R3 Full Title: Seasonal changes in caddis larvae assemblages in river-floodplain habitats along a hydrological connectivity gradient Article Type: Primary research paper Keywords: biodiversity; seasonality; Trichoptera; connectivity gradient; wetlands; Rhine Corresponding Author: Fred van den Brink, Dr. Province of Limburg Maastricht, Limburg NETHERLANDS Corresponding Author Secondary Information: Corresponding Author's Institution: Province of Limburg Corresponding Author's Secondary Institution: First Author: Fred van den Brink, Dr. First Author Secondary Information: Order of Authors: Fred van den Brink, Dr. Gerard Van der Velde, Prof. Dr. Sander Wijnhoven, Dr. Order of Authors Secondary Information: Abstract: In order to assess the impact of seasonality versus connectivity on the ecological quality of Lower Rhine river floodplain habitats we studied the seasonal variation in diversity and species assemblages of caddis larvae by monthly sampling the littoral zone of four water bodies over a lateral connectivity gradient. Seasonal variation in diversity showed a general pattern in these floodplain habitats and could be related to caddisfly life history and habitat preferences. Despite this seasonal variation, caddis larvae species assemblages in the water bodies appeared to be rather stable and could be firmly related to the position of their habitats over the connectivity gradient. The main channel (lotic habitat) was clearly separated from the lentic water bodies, and also the sparsely vegetated water bodies from the well vegetated water bodies. It is concluded that the impact of connectivity, and related parameters such as stream velocity and vegetational coverage, outweighed the impact of season on the caddis larvae assemblages. Response to Reviewers: Dear Dr. Stendera, We have improved the manuscript according to your suggestions, especially with respect to the introduction, data analysis and discussion sections, including all your editorial remarks. We hope our manuscript is now acceptable for publication in your journal. With kind regards, Fred van den Brink Powered by Editorial Manager® and Preprint Manager® from Aries Systems Corporation Manuscript Click here to download Manuscript: HYDR-D-12-07880R2.rev.25-04-2013.doc Click here to view linked References 1 Seasonal changes in caddis larvae assemblages in river-floodplain habitats along a 2 hydrological connectivity gradient 3 4 Fred W.B. van den Brink1, Gerard van der Velde2,3 & Sander Wijnhoven4 5 6 1 Province of Limburg, Department of Water and Nature Management, P.O. Box 5700, 6202 MA Maastricht, The 7 Netherlands. e-mail: [email protected]. 8 2 Radboud University Nijmegen, Institute for Water and Wetland Research, Department of Animal Ecology and 9 Ecophysiology, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands. e-mail: [email protected]. 10 3 Naturalis Biodiversity Center, P.O. Box 9517, 2300 RA Leiden, The Netherlands. 11 4 Royal Netherlands Institute for Sea Research, NIOZ – Yerseke, Monitor Taskforce, P.O. Box 140, 4400 AC 12 Yerseke, The Netherlands. e-mail: [email protected]. 13 14 Abstract 15 In order to assess the impact of seasonality versus connectivity on the ecological quality of Lower Rhine 16 river floodplain habitats we studied the seasonal variation in diversity and species assemblages of caddis 17 larvae by monthly sampling the littoral zone of four water bodies over a lateral connectivity gradient. 18 Seasonal variation in diversity showed a general pattern in these floodplain habitats and could be related 19 to caddisfly life history and habitat preferences. Despite this seasonal variation, caddis larvae species 20 assemblages in the water bodies appeared to be rather stable and could be firmly related to the position 21 of their habitats over the connectivity gradient. The main channel (lotic habitat) was clearly separated 22 from the lentic water bodies, and also the sparsely vegetated water bodies from the well vegetated water 23 bodies. It is concluded that the impact of connectivity, and related parameters such as stream velocity 24 and vegetation coverage, outweighed the impact of season on the caddis larvae assemblages. 25 26 Key-words: biodiversity, seasonality, Trichoptera, connectivity gradient, wetlands, Lower Rhine 27 28 29 Introduction 30 Trichoptera are a major component of the insect fauna of natural rivers and an essential part of the river 31 food-web (Mackay & Wiggins, 1979). Due to their high species richness and their large variety in species 32 specific traits they are useful indicators for ecological monitoring and assessment of river ecosystems 33 (e.g. Chovanec et al., 2005, Waringer et al., 2005). Under natural conditions, river-floodplain ecosystems 34 frequently harbour numerous water bodies which are characterized by high spatial and temporal 35 heterogeneity (Amoros et al., 1987), giving rise to high caddisfly species diversity (Tachet et al., 1994; 36 Graf et al., 2006; Van den Brink et al., 2013). These floodplain water bodies can be arranged according to 37 their hydrological connectivity with the main channel, and connectivity is regarded as a key factor for the 38 functioning of river-floodplain ecosystems (Amoros et al., 1987; Van den Brink et al., 2013). 39 Over the years, caddisfly species assemblages have been examined for several large European rivers, 40 such as the Danube, Rhine, Meuse, Rhône, Neman and Bug. Such recordings on caddisfly species 41 assemblages are generally based on light trap catches of adult specimens (Chantaramongkol, 1983; 2 42 Waringer, 1989, 1991; Van Urk et al., 1991; Tachet et al., 1994; Czachorowski, 2004; Serafin, 2004; Graf 43 et al., 2006). Surprisingly, studies on the seasonal changes in species composition of caddis larvae in 44 riverine floodplain ecosystems are extremely rare. Several studies have focused on the role of river- 45 floodplain connectivity on the caddisfly assemblages (Tachet et al., 1994; Graf et al., 2006; Van den Brink 46 et al., 2013) or the impact of season on flight periods of caddisfly species (Van der Velde & Bergers, 47 1987; Waringer, 1989, 1991; Sommerhäuser et al., 1997). Information on the seasonal variation of caddis 48 larvae assemblages in different floodplain water bodies over a lateral connectivity gradient is entirely 49 lacking. Such information however may be necessary if we wish to conserve or rehabilitate the caddisfly 50 biodiversity in these ecosystems, since species may be present only during a particular season and may 51 be missed by standard monitoring procedures. 52 As many other large rivers the Lower Rhine has been degraded over the years by water pollution and 53 river regulation (Van den Brink et al., 1996). River regulation reduces the connectivity between the lotic 54 and lentic floodplain water bodies and prevents the creation and rejuvenation of aquatic habitats, with 55 negative consequences for biodiversity. In order to restore the biodiversity of the Lower Rhine river- 56 floodplain ecosystems, restoration works have been carried out recently within the frame of the Rhine 57 Action Plan with variable succes. 58 In order to assess the impact of connectivity on the ecological integrity of aquatic habitats in the Lower 59 Rhine floodplains, we studied the spatio-temporal variation in species diversity and species assemblages 60 of caddis larvae over the whole lateral connectivity gradient. In an earlier study on macroinvertebrate 61 species assemblages in the Lower Rhine river ecosystem we found caddisfly species indicative for 62 hydrologically different types of floodplain water bodies (Van den Brink et al., 1994). In Van den Brink et 63 al. (2013) we extended the connectivity gradient by including the lotic component of the floodplain 64 ecosystem. Here we test the relative importance of seasonality versus variation in connectivity of 65 floodplain water bodies for the occurrence and abundance of caddis larvae. Since water temperature 66 strongly influences growth, activity and flight periods of individual caddisfly species in aquatic ecosystems 67 in the temperate climate zone (Mackay & Wiggins, 1979; Higler, 2005), we expected a major impact of 68 season on the caddis larvae assemblages in floodplain habitats over the connectivity gradient. 69 3 70 Methods 71 Study sites 72 The study area is situated on the left bank of the Lower Rhine in the Netherlands, between river kms 876- 73 894. Highest water levels in the Lower Rhine occur normally outside the growth season, during winter and 74 spring. Over the years, water level fluctuations of 6 m occur in this river stretch. At water levels higher 75 than 12 m above sea level (a.s.l.), all water bodies in the active floodplain are connected to the main 76 channel. The water bodies behind the main dikes, i.e. in the former floodplain, are never flooded but are 77 connected to the main channel via groundwater fluxes only. 78 Seasonal fluctuations in occurrence and relative abundance of caddis larvae have been studied during 79 1991 in four Lower Rhine floodplain water bodies along a lateral hydrological connectivity gradient. The 80 four water bodies were characterized according to the typology of Amoros et al. (1987): eupotamon: main 81 channel; plesiopotamon: disconnected channel at a distance of 10 m from main channel and connected 82 via floods
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