Realm: Freshwater
Climate: Temperate
Biome: Multiple
Central latitude: 46.837412
Central longitude: 2.671699
Duration: 28 years, from 1981 to 2017

8646 records

53 distinct species

Across the time series Barbatula barbatula is the most frequently occurring species

Methods

The data presented here cover ?4 decades of electrofishing surveys in mainland France rivers. Despite some changes in field protocols and sampling site locations over time, the ASPE database offers a unique set of 47,869 georeferenced and standardised sampling surveys. Fish individuals are identified to species, measured and weighted.” Though preferentially focused on fishes, the surveys also report crayfish data.” [Extracted from the abstract of Irz et al., 2022] The field sampling protocols have evolved throughout years due to (1) shifts in the objectives pursued, (2) scientific improvement of sampling techniques, (3) attempts to standardise sampling at national and European scales to gain comparability and (4) sampling increase of large river systems (Fig. 3). Long-term network monitoring of fish assemblages requires standardised methods that provide comparable quality data. All the surveys reported here were carried out by electrofishing following standardised procedures. Two kinds of survey are reported in the database: (1) species-specific surveys (the abundance indexes”, see Fig. 3) that should not be used for the interpretation of other taxa (a taxon not reported does not indicate its absence); (2) multi-species inventories. Among multi-species inventories, complete sampling was performed for small wadable streams with one (single-pass), two, or occasionally three or more passes (multi-pass, see Belliard et al., 2012). For deeper and/or wider streams, several methods have been used, using boats when required; i.e. banks continuous sampling (Belliard et al., 2012), banks stratified habitat sampling (Pouilly, 1994) and systematic point sampling (75 or 100 spots sampled, respectively, for medium and large rivers, see Tomanova et al., 2013). The length of the sampling point is set to include at least one riffle/pool sequence or two meanders, i.e. length exceeding 12 to 15 times the mean wetted width (variables odp_longueur” and odp_largeur_lame_eau”, respectively, in the Table operation_description_peche”). As required by the European Norm CEN-EN-14011 on sampling of fish with electricity, and to minimise the gaps between the threshold values proposed, the minimal length of sampling point was set after Belliard et al. (2012), (Table 2). The Table operation_description_peche” documents the conditions of the surveys including the gear type and tuning, along with measures of water conductivity and temperature. Over 90% of the surveys were carried out with direct current. The elementary sample” (table prelevement_elementaire”) is the finest grain of sound faunistic list entered in the database. Depending on the protocol implemented in the field, it pools together the catches from a set of fish batches and individuals according to different rules: (1) In complete single-pass sampling or in banks continuous sampling, the elementary sample is the whole catch for the survey. (2) In complete multi-pass sampling, the elementary sample gathers the catch for a pass. (3) In banks sampling stratified by habitat, it gathers all the catches in a given habitat strata (e.g. the riffle habitats). (4) In systematic point sampling, a compulsory elementary sample gathers the catches on the 75 (or 100) spots of the design, and an optional elementary sample gathers the catches on the so-called supplementary points” that are not included in the base protocol, but that field operators may find useful to sample because of their fine-scale originality (e.g. tributary outlet, fallen tree).” [This text corresponds to section 3.1 Electrofishing protocols, extracted from Irz et al., 2022] Additional: The original dataset was split into 12 datasets each with a unique consistent methodology. In each resulting dataset, the survey methods and survey strategy are consistent across sites. The same site might appear across resulting datasets if the location was monitored with different methodologies. Grain size is the average area sampled across the sites in each resulting dataset (in m2). Abundance units= n ind/100m2, Biomass units=weights in g/100m2.

Citation(s)

@Article{BioTIME_cit685, Study_id = {825}, Citation_id = {685}, Author = {Irz, Pascal and Vigneron, Thibault and Poulet, Nicolas and Cosson, Eddy and Point, Thierry and Baglini{\`e}re, Erick and Porcher, Jean-Pierre}, Journal = {Knowledge & Management of Aquatic Ecosystems}, Pages = {25}, Title = {A long-term monitoring database on fish and crayfish species in French rivers}, Volume = {423}, Year = {2022}, Doi = {10.1051/kmae/2022021}, Language = {English} }