Biodiversity Data Journal :
Data Paper (Biosciences)
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Corresponding author: Alexey Nesterkov (nesterkov@ipae.uran.ru)
Academic editor: Dmitry Schigel
Received: 08 Jun 2020 | Accepted: 30 Jun 2020 | Published: 08 Oct 2020
© 2020 Alexey Nesterkov, Maxim Zolotarev, Elena Belskaya, Tatyana Tuneva
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Nesterkov A, Zolotarev M, Belskaya E, Tuneva T (2020) Arachnids (Araneae, Opiliones) from grass stand and forest litter in the Urals, Russia. Biodiversity Data Journal 8: e55242. https://doi.org/10.3897/BDJ.8.e55242
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Since the late 1980s, long-term monitoring of various components of natural ecosystems under conditions of industrial pollution has been carried out in the Central Urals. In the mid-2000s, similar programmes were started in the Southern Urals. As a part of these monitoring programmes, the data on invertebrates in different types of biotopes, collected with different methods and in a different time intervals, continue to be gathered. Amongst the most well-studied groups of invertebrates are spiders and harvestmen whose communities are a convenient indicator of the environment. The data collected through these monitoring programmes can also be used to study natural local biodiversity.
The dataset, presented here, includes information from a long-term monitoring programme for Araneae and Opiliones that inhabit grass stands of secondary dry meadows and litter of spruce-fir, aspen-birch and pine-birch forests in the Central and Southern Urals. The dataset (available from the GBIF network at https://www.gbif.org/dataset/e170dbd1-a67f-4514-841c-5296b290ca90) describes the assemblage structure of spiders and harvestmen (list of species and their abundance), age-sex composition and seasonal and inter-annual dynamics for two large areas in the southern taiga zone of the Ural Mountains. The dataset includes 1,351 samples, which correspond to 5,462 occurrences identified during 2004–2009, 2013 and 2018. In total, we collected 10,433 specimens, representing 178 species (36% of arachnofauna of the Urals), 115 genera (54%) and 23 families (100%). Most of the data (4,939 of 5,462 occurrences, 90%) were collected in the western macro-slope of the Ural Mountains (European part of Russia), the rest in the eastern macro-slope (Asian part). All represented data were sampled in industrially undisturbed areas and are used as a local reference for ecotoxicological monitoring. The dataset provides new useful information for recording the state of biodiversity for the Central and Southern Urals and contributes to the study of biodiversity conservation.
Occurrence, diversity, abundance, seasonal dynamics, interannual dynamics, sex ratio, age-sex composition, life stage
The arachnids are a widespread group of invertebrates; almost all Araneae and many Opiliones are obligate predators. It was shown that spiders can be used as indicators of local diversity (
The fauna of spiders and harvestmen in the Central and Southern Urals is currently one of the most studied in Russia. At the present time, the fauna of Araneae of the Urals includes 485 species belonging to 202 genera from 23 families (
The presented dataset for the Central Urals contains 166 species (of which 159 species (68% of total regional fauna) are spiders and seven (70%) are harvestmen) and for the Southern Urals, it contains 55 species (53 (29%) and two (25%), respectively). Poor level of knowledge of the fauna of the Southern Urals is caused by the limited extent of monitoring (currently only one year). The family with the greatest number of species and genera is Linyphiidae (50% and 56%, respectively). In the temperate climatic part of the Urals, local arachnid fauna are comparable in terms of the ratio of families with the largest number of species (
Spider fauna of the Urals has a number of distinctive features. Firstly, it can be characterised as poor: the diversity is lower than that of the fauna of the adjacent plains (both East European and West Siberian (
Biota of contaminated areas under high pollution and during the reduction of industrial emissions
The Ural Mountains are a north-south orientated mountain system in the Urals, located between the East European and West Siberian plains (Fig.
The study was conducted in the southern taiga zone of the Central and Southern Urals, Russia, in the lowest part of the uplands (300–400 m above sea level). A total of twelve sampling plots (= locationID) were established across three types of biotopes: primary spruce-fir (four plots), secondary aspen-birch forests (two plots), pine-birch forest (three plots) and secondary upland meadows (three plots).
All the represented sampling schemes refer to different ongoing long-term monitoring projects, consolidated by the same research objects. At the present time, sampling with the biocenometer was carried out in the Central Urals on 21 June 2006 – 02 September, 2006; 25 June 2007 – 29 August 2007; 17 June 2008 – 28 August 2008. Line-designed pitfall trapping in the Central Urals was carried out on 12 May 2004 – 24 August 2004; 10 June 2009 – 08 September 2009; 14 June 2013 – 02 September 2013; in the Southern Urals on 28 May 2009 – 01 September 2009. Matrix-designed pitfall trapping was carried out in the Central Urals on 04 May 2005 – 16 August 2005; 25 May 2018 – 21 August 2018.
Sampling of meadow grass stand invertebrates was completed using a biocenometer. Samples were collected at three permanent free-form sampling plots (approximately 2500 m2 in size) that were positioned at a distance of 100–300 m from each other in the lower parts of the secondary upland meadows created through forest clear-cutting more than 60 years ago (Table
Sampling Protocol |
Habitat |
Plot (=locationID) |
Trap-line |
Latitude б Longitude |
biocenometer |
meadow grass stand |
f1-nest |
– |
|
f2-nest |
– |
|
||
f3-nest |
– |
|
||
line-designed pitfall trapping |
pine-birch forest litter |
K26S |
1 |
|
2 |
|
|||
3 |
|
|||
K27S |
1 |
|
||
2 |
|
|||
3 |
|
|||
K32N |
1 |
|
||
2 |
|
|||
3 |
|
|||
aspen-birch forest litter |
R16W |
1 |
|
|
2 |
|
|||
3 |
|
|||
R27W |
1 |
|
||
2 |
|
|||
3 |
|
|||
spruce-fir forest litter |
R20W |
1 |
|
|
2 |
|
|||
3 |
|
|||
R29W |
1 |
|
||
2 |
|
|||
3 |
|
|||
R33W |
1 |
|
||
2 |
|
|||
3 |
|
|||
frame-designed pitfall trapping |
spruce-fir forest litter |
R20W-frame |
– |
|
Sampling was performed by using a modified biocenometer consisting of a bottom (metal frame 50×50 cm) hermetically connected to a cube-shaped covering of a dense cloth (Fig.
Pitfall trapping was carried out in biotopes most typical for the studied areas: primary spruce-fir forest, secondary aspen-birch forest and pine-birch forest (Fig.
A total of more than 10400 individuals of spiders and harvestmen were collected. All specimens were wet-preserved in 70% alcohol and stored in the depository of the Laboratory for Population and Community Ecotoxicology of the Institute of Plant and Animal Ecology, Ural Branch, Russian Academy of Sciences (IPAE UB RAS). Most of the adult specimens were identified to species (except for those severely damaged during the sampling). Species identification was also carried out on juvenile specimens when there was no doubt about their identity. Identification of species was performed by a permanent team of researchers (IPAE UB RAS) using
The studied areas are located in the southern taiga zone of the Central and Southern Urals. The polygon at the Central Urals is located 60–70 km westbound from Yekaterinburg in primary spruce-fir and secondary aspen-birch forests with secondary upland meadows created through clear-cutting. At the Southern Urals, two polygons are located 10 and 60 km NE from Miass, in pine-birch forest.
55.1 and 56.868 Latitude; 56.82 and 60.793 Longitude.
The dataset contains all of the information obtained during the sampling for the Arachnida class (including Araneae and Opiliones orders). General taxonomic coverage is one Phylum, two Orders, 23 Families, 115 Genera and 178 Species (
Rank | Scientific Name | Common Name |
---|---|---|
class | Arachnida | arachnids |
order | Araneae | spiders |
order | Opiliones | harvestmen |
At the present time, the following periods are covered: 12 May 2004 – 08 September 2009; 14 June 2013 – 02 September 2013; 24 May 2018 – 21 August 2018.
The dataset describes the quantitative and qualitative structure of arachnids, age-sex composition and seasonal and inter-annual dynamics for two large areas in the southern taiga zone of the Ural mountains. Arachnids were sampled with three general schemes, which allowed the coverage of a wide range of habitats: inhabitants of grass stand were collected using biocenometer (three sampling plots (= locationID) in total), inhabitants of forest litter were collected using line-designed (eight plots) and matrix-designed pitfall trapping (one plot). The dataset includes 1351 samples (= sampling events), which corresponded to 5462 occurrences identified during 2004–2009, 2013 and 2018. In total, we collected 10433 specimens, representing 178 species (36% of arachnofauna of the Urals), 115 genera (54%) and 23 families (100%). Only samples that contained arachnids (occurrenceStatus = present) have been provided. The dataset represents the new data useful for recording the state of biodiversity of a region and contributes to the study of biodiversity conservation.
Column label | Column description |
---|---|
eventID | An identifier for the set of information associated with an Event (something that occurs at a place and time). May be a global unique identifier or an identifier specific to the dataset. |
occurrenceID | An identifier for the Occurrence (as opposed to a particular digital record of the occurrence). |
basisOfRecord | The specific nature of the data record. |
specificEpithet | The name of the first or species epithet of the scientificName. |
organismQuantity | A number or enumeration value for the quantity of organisms. |
organismQuantityType | The type of quantification system used for the quantity of organisms. |
scientificName | The full scientific name, with authorship and date information, if known. |
kingdom | The full scientific name of the kingdom in which the taxon is classified. |
phylum | The full scientific name of the phylum or division in which the taxon is classified. |
class | The full scientific name of the class in which the taxon is classified. |
order | The full scientific name of the order in which the taxon is classified. |
family | The full scientific name of the family in which the taxon is classified. |
genus | The full scientific name of the genus in which the taxon is classified. |
taxonRank | The taxonomic rank of the most specific name in the scientificName. |
sex | The sex of the biological individual(s) represented in the Occurrence. |
lifeStage | The age class or life stage of the biological individual(s) at the time the Occurrence was recorded. |
occurrenceRemarks | Comments or notes about the Occurrence. |
recordedBy | A list (concatenated and separated) of names of people, groups or organisations responsible for recording the original Occurrence. |
identifiedBy | A list (concatenated and separated) of names of people, groups or organisations who assigned the Taxon to the subject. |
samplingProtocol | The name of, reference to, or description of the method or protocol used during an Event. |
samplingEffort | The amount of effort expended during an Event. |
sampleSizeValue | A numeric value for a measurement of the size (time duration, length, area or volume) of a sample in a sampling event. |
sampleSizeUnit | The unit of measurement of the size (time duration, length, area or volume) of a sample in a sampling event. |
eventDate | The date-time or interval during which an Event occurred. |
habitat | A category or description of the habitat in which the Event occurred. |
year | The four-digit year in which the Event occurred, according to the Common Era Calendar. |
month | The ordinal month in which the Event occurred. |
country | The name of the country or major administrative unit in which the Location occurs. |
countryCode | The standard code for the country in which the Location occurs. |
stateProvince | The specific description of the place. |
municipality | The full, unabbreviated name of the next smaller administrative region than county (city, municipality etc.) in which the Location occurs. Do not use this term for a nearby named place that does not contain the actual location. |
locality | The specific description of the place. Less specific geographic information can be provided in other geographic terms (higherGeography, continent, country, stateProvince, county, municipality, waterBody, island, islandGroup). This term may contain information modified from the original to correct perceived errors or standardise the description. |
locationID | An identifier for the set of location information (data associated with dcterms:Location). |
decimalLatitude | The geographic latitude (in decimal degrees, using the spatial reference system given in geodeticDatum) of the geographic centre of a Location. |
decimalLongitude | The geographic longitude (in decimal degrees, using the spatial reference system given in geodeticDatum) of the geographic centre of a Location. |
geodeticDatum | The ellipsoid, geodetic datum or spatial reference system (SRS) upon which the geographic coordinates given in decimalLatitude and decimalLongitude are based. |
coordinateUncertaintyInMetres | The horizontal distance (in metres) from the given decimalLatitude and decimalLongitude describing the smallest circle containing the whole of the Location. Leave the value empty if the uncertainty is unknown, cannot be estimated or is not applicable (because there are no coordinates). Zero is not a valid value for this term. |
ownerInstitutionCode | The name (or acronym) in use by the institution having ownership of the object(s) or information referred to in the record. |
We collected a total of 10,433 specimens of arachnids (7,527 spiders and 2,906 harvestmen, Table
Order |
Family |
Species |
Central Urals |
Southern Urals |
Total |
||
Meadow grass stand |
Spruce-fir forest litter |
Aspen-birch forest litter |
Pine-birch forest litter |
||||
Araneae |
Araneidae |
Araneus alsine |
2/2 |
2/2 |
|||
Araneus marmoreus |
1/1 |
1/1 |
|||||
Araneus sturmi |
0/2 |
0/2 |
|||||
Cercidia prominens |
1/1 |
3/3 |
4/4 |
||||
Cyclosa conica |
0/1 |
0/1 |
|||||
Cheiracanthiidae |
Cheiracanthium erraticum |
2/2 |
2/2 |
||||
Clubionidae |
Clubiona caerulescens |
3/4 |
4/4 |
1/1 |
8/9 |
||
Clubiona kulczynskii |
7/7 |
1/1 |
8/8 |
||||
Clubiona lutescens |
8/8 |
2/2 |
10/10 |
||||
Clubiona neglecta |
1/1 |
1/1 |
|||||
Clubiona stagnatilis |
2/2 |
2/2 |
|||||
Cybaeidae |
Cryphoeca silvicola |
21/21 |
4/4 |
25/25 |
|||
Dictynidae |
Dictyna arundinacea |
3/3 |
1/1 |
4/4 |
|||
Gnaphosidae |
Drassyllus pusillus |
1/1 |
1/1 |
||||
Haplodrassus soerenseni |
6/6 |
1/1 |
27/27 |
34/34 |
|||
Micaria pulicaria |
1/1 |
1/1 |
|||||
Zelotes clivicola |
2/2 |
2/2 |
|||||
Zelotes subterraneus |
2/2 |
9/9 |
11/11 |
||||
Hahniidae |
Antistea elegans |
4/4 |
1/1 |
5/5 |
|||
Hahnia ononidum |
6/6 |
30/31 |
36/37 |
||||
Hahnia pusilla |
3/3 |
30/30 |
1/1 |
34/34 |
|||
Linyphiidae |
Abacoproeces saltuum |
4/4 |
4/4 |
||||
Abiskoa abiskoensis |
1/1 |
1/1 |
|||||
Agyneta affinis |
2/2 |
5/5 |
7/7 |
||||
Agyneta allosubtilis |
5/5 |
2/2 |
7/7 |
||||
Agyneta conigera |
36/36 |
2/2 |
1/1 |
39/39 |
|||
Agyneta olivacea |
164/165 |
2/2 |
19/19 |
185/186 |
|||
Agyneta ramosa |
11/11 |
11/11 |
|||||
Agyneta subtilis |
1/1 |
1/1 |
|||||
Allomengea scopigera |
1/1 |
2227/2229 |
284/284 |
3/3 |
2515/2517 |
||
Allomengea vidua |
13/14 |
13/14 |
|||||
Anguliphantes angulipalpis |
3/3 |
1/1 |
1/1 |
5/5 |
|||
Asthenargus paganus |
175/175 |
5/5 |
180/180 |
||||
Bathyphantes gracilis |
2/2 |
3/3 |
5/5 |
||||
Bathyphantes nigrinus |
13/13 |
14/14 |
28/28 |
55/55 |
|||
Bathyphantes parvulus |
10/10 |
10/10 |
|||||
Bolyphantes alticeps |
36/47 |
46/47 |
2/2 |
2/2 |
86/98 |
||
Centromerus arcanus |
1/1 |
150/150 |
3/3 |
154/154 |
|||
Centromerus brevipalpus |
2/2 |
2/2 |
|||||
Centromerus clarus |
40/40 |
4/4 |
44/44 |
||||
Centromerus levitarsis |
1/1 |
1/1 |
|||||
Centromerus sylvaticus |
2/2 |
338/338 |
20/20 |
3/3 |
363/363 |
||
Ceraticelus bulbosus |
4/4 |
4/4 |
|||||
Ceratinella brevipes |
5/5 |
5/5 |
|||||
Ceratinella brevis |
1/1 |
24/24 |
14/14 |
39/39 |
|||
Ceratinella scabrosa |
8/8 |
8/8 |
|||||
Cnephalocotes obscurus |
3/3 |
1/1 |
1/1 |
5/5 |
|||
Decipiphantes decipiens |
4/4 |
4/4 |
|||||
Dicymbium tibiale |
1/1 |
7/7 |
8/8 |
||||
Diplocentria bidentata |
22/22 |
22/22 |
|||||
Diplocephalus picinus |
25/25 |
8/8 |
20/20 |
53/53 |
|||
Diplostyla concolor |
9/10 |
2/2 |
11/12 |
||||
Dismodicus bifrons |
9/9 |
1/1 |
10/10 |
||||
Drapetisca socialis |
7/8 |
7/8 |
|||||
Erigonella hiemalis |
74/74 |
20/20 |
94/94 |
||||
Erigonella ignobilis |
21/21 |
1/1 |
22/22 |
||||
Flagelliphantes bergstromi |
1/1 |
1/1 |
|||||
Floronia bucculenta |
1/1 |
4/4 |
2/2 |
7/7 |
|||
Gonatium rubellum |
1/1 |
10/10 |
11/11 |
||||
Gongylidiellum latebricola |
1/1 |
1/1 |
|||||
Helophora insignis |
1/1 |
3/3 |
4/4 |
||||
Hypselistes jacksoni |
5/5 |
10/10 |
3/3 |
18/18 |
|||
Kaestneria pullata |
2/2 |
2/2 |
|||||
Leptorhoptrum robustum |
1/1 |
1/1 |
|||||
Linyphia triangularis |
1/1 |
1/1 |
|||||
Macrargus rufus |
33/33 |
12/12 |
6/6 |
51/51 |
|||
Maro pansibiricus |
49/49 |
3/3 |
6/6 |
58/58 |
|||
Maro sibiricus |
14/14 |
3/3 |
17/17 |
||||
Metopobactrus prominulus |
6/6 |
6/6 |
|||||
Micrargus herbigradus |
5/5 |
5/5 |
|||||
Microlinyphia pusilla |
1/2 |
1/2 |
|||||
Microneta viaria |
116/116 |
34/34 |
25/25 |
175/175 |
|||
Minyriolus pusillus |
30/30 |
1/1 |
31/31 |
||||
Neriene clathrata |
5/5 |
3/3 |
1/1 |
9/9 |
|||
Neriene emphana |
1/1 |
6/6 |
1/1 |
8/8 |
|||
Neriene montana |
2/2 |
1/1 |
3/3 |
||||
Notioscopus sarcinatus |
2/2 |
2/2 |
|||||
Obscuriphantes obscurus |
2/2 |
2/2 |
|||||
Oedothorax apicatus |
1/1 |
1/1 |
|||||
Oedothorax retusus |
2/2 |
2/2 |
|||||
Oryphantes geminus |
23/23 |
2/2 |
25/25 |
||||
Palliduphantes alutacius |
31/31 |
4/4 |
1/1 |
36/36 |
|||
Palliduphantes antroniensis |
1/1 |
1/1 |
|||||
Panamomops dybowskii |
7/7 |
7/7 |
|||||
Pocadicnemis pumila |
21/21 |
2/2 |
1/1 |
24/24 |
|||
Porrhomma pallidum |
1/1 |
1/1 |
|||||
Semljicola faustus |
2/2 |
2/2 |
|||||
Semljicola thaleri |
46/46 |
46/46 |
|||||
Silometopus elegans |
1/1 |
1/1 |
|||||
Sintula corniger |
2/2 |
2/2 |
|||||
Stemonyphantes conspersus |
1/1 |
1/1 |
|||||
Styloctetor stativus |
6/6 |
6/6 |
|||||
Tallusia experta |
15/15 |
1/1 |
16/16 |
||||
Tapinocyba insecta |
172/172 |
34/34 |
12/12 |
218/218 |
|||
Tapinopa longidens |
6/6 |
1/1 |
7/7 |
||||
Tenuiphantes alacris |
1/1 |
6/6 |
7/7 |
||||
Tenuiphantes mengei |
1/1 |
1/1 |
6/6 |
8/8 |
16/16 |
||
Tenuiphantes nigriventris |
129/129 |
1/1 |
11/11 |
141/141 |
|||
Tenuiphantes tenebricola |
136/136 |
40/40 |
17/17 |
193/193 |
|||
Thyreosthenius parasiticus |
1/1 |
1/1 |
|||||
Tibioplus diversus |
11/11 |
1/1 |
12/12 |
||||
Trematocephalus cristatus |
1/1 |
1/1 |
2/2 |
||||
Walckenaeria alticeps |
3/3 |
1/1 |
4/4 |
||||
Walckenaeria antica |
1/1 |
3/3 |
2/2 |
6/6 |
|||
Walckenaeria atrotibialis |
18/18 |
7/7 |
5/5 |
30/30 |
|||
Walckenaeria cucullata |
1/1 |
1/1 |
|||||
Walckenaeria dysderoides |
1/1 |
1/1 |
|||||
Walckenaeria mitrata |
1/1 |
1/1 |
5/5 |
7/7 |
|||
Walckenaeria nodosa |
2/2 |
2/2 |
|||||
Walckenaeria nudipalpis |
1/1 |
62/62 |
14/14 |
77/77 |
|||
Walckenaeria obtusa |
21/21 |
21/21 |
|||||
Walckenaeria unicornis |
2/2 |
1/1 |
3/3 |
||||
Walckenaeria vigilax |
7/7 |
7/7 |
|||||
Zornella cultrigera |
7/7 |
1/1 |
8/8 |
||||
Liocranidae |
Agroeca brunnea |
6/6 |
2/2 |
8/8 |
|||
Agroeca proxima |
2/2 |
3/3 |
23/23 |
28/28 |
|||
Lycosidae |
Alopecosa aculeata |
30/30 |
30/30 |
||||
Alopecosa pinetorum |
2/2 |
2/2 |
|||||
Alopecosa pulverulenta |
1/1 |
1/1 |
|||||
Alopecosa sulzeri |
2/2 |
2/2 |
|||||
Alopecosa taeniata |
14/14 |
4/4 |
143/143 |
161/161 |
|||
Pardosa amentata |
1/1 |
1/1 |
|||||
Pardosa fulvipes |
19/21 |
19/21 |
|||||
Pardosa lugubris |
7/7 |
45/45 |
63/63 |
74/74 |
189/189 |
||
Pardosa riparia |
1/1 |
1/1 |
2/2 |
||||
Pardosa sphagnicola |
7/8 |
3/3 |
10/11 |
||||
Pirata uliginosus |
6/6 |
1/1 |
1/1 |
8/8 |
|||
Piratula hygrophila |
21/24 |
51/54 |
454/532 |
2/2 |
528/612 |
||
Trochosa ruricola |
5/5 |
1/1 |
6/6 |
||||
Trochosa spinipalpis |
2/2 |
2/2 |
|||||
Trochosa terricola |
2/2 |
8/8 |
20/20 |
10/10 |
40/40 |
||
Xerolycosa nemoralis |
0/2 |
0/2 |
|||||
Mimetidae |
Ero cambridgei |
1/1 |
1/1 |
||||
Ero furcata |
16/16 |
1/1 |
1/1 |
18/18 |
|||
Miturgidae |
Zora nemoralis |
26/26 |
26/26 |
||||
Zora spinimana |
4/5 |
4/4 |
2/2 |
5/6 |
15/17 |
||
Oxyopidae |
Oxyopes ramosus |
0/24 |
0/24 |
||||
Philodromidae |
Thanatus sabulosus |
3/3 |
3/3 |
||||
Tibellus oblongus |
1/3 |
1/3 |
|||||
Phrurolithidae |
Phrurolithus festivus |
1/1 |
1/1 |
||||
Pisauridae |
Dolomedes fimbriatus |
2/2 |
2/2 |
||||
Pisaura mirabilis |
0/6 |
0/6 |
|||||
Salticidae |
Dendryphantes rudis |
1/1 |
1/1 |
||||
Euophrys frontalis |
3/5 |
3/5 |
|||||
Evarcha arcuata |
1/1 |
1/1 |
|||||
Evarcha falcata |
12/13 |
3/3 |
15/16 |
||||
Marpissa pomatia |
16/26 |
16/26 |
|||||
Sibianor larae |
3/3 |
3/3 |
|||||
Talavera aequipes |
1/1 |
1/1 |
|||||
Sparassidae |
Micrommata virescens |
1/16 |
1/16 |
||||
Tetragnathidae |
Metellina mengei |
4/4 |
2/2 |
6/6 |
|||
Pachygnatha degeeri |
1/1 |
1/1 |
2/2 |
||||
Pachygnatha listeri |
7/8 |
20/20 |
13/13 |
1/1 |
41/42 |
||
Tetragnatha extensa |
1/1 |
1/1 |
|||||
Tetragnatha pinicola |
4/4 |
4/4 |
|||||
Theridiidae |
Canalidion montanum |
1/1 |
1/1 |
||||
Cryptachaea riparia |
1/1 |
1/1 |
|||||
Enoplognatha ovata |
1/2 |
1/2 |
|||||
Neottiura bimaculata |
8/8 |
8/8 |
|||||
Robertus lividus |
54/55 |
11/11 |
14/14 |
79/80 |
|||
Rugathodes aurantius |
13/13 |
13/13 |
|||||
Theridion varians |
2/2 |
2/2 |
|||||
Thomisidae |
Misumena vatia |
2/7 |
2/7 |
||||
Ozyptila praticola |
1/1 |
37/37 |
38/38 |
||||
Ozyptila trux |
10/10 |
10/10 |
4/4 |
2/2 |
26/26 |
||
Xysticus audax |
9/9 |
2/2 |
11/11 |
||||
Xysticus cristatus |
5/5 |
5/5 |
|||||
Xysticus lanio |
1/1 |
1/1 |
|||||
Xysticus luctuosus |
2/2 |
47/47 |
49/49 |
||||
Xysticus obscurus |
1/1 |
1/1 |
|||||
Xysticus ulmi |
1/1 |
1/1 |
|||||
Opiliones |
Phalangiidae |
Lacinius ephippiatus |
9/28 |
212/548 |
35/108 |
0/1 |
256/685 |
Lophopilio palpinalis |
14/36 |
20/40 |
34/76 |
||||
Mitopus morio |
6/6 |
55/115 |
6/242 |
67/363 |
|||
Oligolophus tridens |
99/152 |
229/437 |
28/42 |
356/631 |
|||
Phalangium opilio |
2/3 |
2/3 |
|||||
Rilaena triangularis |
6/11 |
3/81 |
0/25 |
9/117 |
|||
Nemastomatidae |
Nemastoma lugubre |
11/14 |
838/846 |
96/96 |
5/5 |
950/961 |
|
Total species |
92 |
106 |
74 |
55 |
|||
Species abundance |
738 |
6775 |
1810 |
654 |
|||
Total abundance |
752 |
7091 |
1816 |
774 |
In the Central Urals, three types of biotopes were investigated: meadow grass stand (502 spiders and 250 harvestmen), spruce-fir (4,962 and 2,129, respectively) and aspen-birch (1,303 and 513) forest litter. In the grass stand, 21 families of arachnids were detected; the greatest abundance and species richness were revealed in Phalangiidae (31% of specimens, 7% of species), Linyphiidae (28% and 40%, respectively), Lycosidae (10% and 9%) and Salticidae (7% and 7%). In the spruce-fir forest litter (17 families), the most abundant and rich with species were Linyphiidae (65% of specimens, 61% of species), Phalangiidae (18% and 5%), Nemastomatidae (12% and 1%) and Lycosidae (2% and 10%). In the aspen-birch forest litter (14 families), the dominant families were the same: Lycosidae (34% and 10%), Linyphiidae (33% and 64%), Phalangiidae (23% and 5%) and Nemastomatidae (5% and 1%).
In the Southern Urals, sampling was carried out only in the prevailing biotope, the pine-birch forest litter (760 spiders and 14 harvestmen). A total of 16 families were revealed; greatest abundance and species richness were found in Lycosidae (40% of specimens, 11% of species), Linyphiidae (28% and 51%) and Thomisidae (13% and 7%). The family with the greatest number of species and genera is Linyphiidae, which is typical for arachnofauna of the climatically-temperate part of the Urals (
It is interesting that the family Oxyopidae is represented only by juvenile specimens of Oxyopes ramosus (Martini & Goeze, 1778) (Table
Age-sex composition is an important characteristic of the state of natural communities. For spiders, adult individuals predominate (Table
Habitat differentiation in age-sex composition of the Arachnida families (sex status for the adult and undamaged specimens only)
Family |
Meadow grass stand |
Spruce-fir forest litter |
Aspen-birch forest litter |
Pine-birch forest litter |
Total |
||||||||
Adult |
Juvenile |
Adult |
Juvenile |
Adult |
Juvenile |
Adult |
Juvenile |
||||||
Male |
Female |
Male |
Female |
Male |
Female |
Male |
Female |
||||||
Araneidae |
2 |
2 |
3 |
7 |
3 |
1 |
18 |
||||||
Cheiracanthiidae |
1 |
1 |
2 |
||||||||||
Clubionidae |
18 |
3 |
1 |
1 |
3 |
1 |
3 |
1 |
31 |
||||
Cybaeidae |
2 |
19 |
4 |
25 |
|||||||||
Dictynidae |
3 |
1 |
4 |
||||||||||
Gnaphosidae |
1 |
3 |
8 |
1 |
8 |
28 |
2 |
51 |
|||||
Hahniidae |
5 |
2 |
1 |
36 |
3 |
28 |
1 |
76 |
|||||
Linyphiidae |
149 |
46 |
13 |
1484 |
2931 |
158 |
204 |
395 |
2 |
61 |
128 |
30 |
5601 |
Liocranidae |
1 |
6 |
2 |
3 |
6 |
19 |
2 |
39 |
|||||
Lycosidae |
62 |
6 |
9 |
32 |
98 |
21 |
195 |
348 |
80 |
43 |
218 |
51 |
1163 |
Mimetidae |
1 |
3 |
13 |
5 |
1 |
1 |
24 |
||||||
Miturgidae |
3 |
1 |
1 |
4 |
2 |
4 |
27 |
2 |
44 |
||||
Oxyopidae |
24 |
24 |
|||||||||||
Philodromidae |
1 |
9 |
3 |
13 |
|||||||||
Phrurolithidae |
1 |
1 |
|||||||||||
Pisauridae |
2 |
6 |
8 |
||||||||||
Salticidae |
23 |
13 |
13 |
1 |
1 |
3 |
1 |
55 |
|||||
Sparassidae |
1 |
15 |
16 |
||||||||||
Tetragnathidae |
6 |
7 |
4 |
13 |
12 |
1 |
8 |
7 |
1 |
59 |
|||
Theridiidae |
22 |
1 |
1 |
9 |
45 |
1 |
2 |
10 |
5 |
11 |
107 |
||
Thomisidae |
13 |
2 |
5 |
3 |
23 |
9 |
1 |
5 |
17 |
70 |
13 |
161 |
|
Phalangiidae |
90 |
46 |
100 |
273 |
246 |
764 |
36 |
33 |
348 |
9 |
1945 |
||
Nemastomatidae |
6 |
5 |
3 |
438 |
399 |
8 |
52 |
44 |
5 |
960 |
|||
Total |
409 |
135 |
208 |
2269 |
3840 |
976 |
502 |
883 |
431 |
149 |
515 |
110 |
With reference to the sex ratio of both spiders and harvestmen in temperate latitudes, the predominance of females is characteristic throughout the summer season (
Amongst the interesting finds of species, it is important to point out Sintula corniger (Blackwall, 1856) of Linyphiidae. This is a rare (widely distributed, but not numerous everywhere) species with a trans-European nemoral distribution area (from Great Britain and France to the Urals, from Fennoscandia to Romania and Azerbaijan (
We would like to thank Sergey L. Esyunin for participation in identification of species, Maxim Grebennikov for help in fieldwork and Maxim Shashkov for participation in hosting the database on GBIF.
Alexey Nesterkov - fieldwork, sorting and cleaning of the samples, database compilation, manuscript preparation. Maxim Zolotarev - fieldwork, sorting and cleaning of the samples, database compilation, species identification. Elena Belskaya - fieldwork, sorting and cleaning of the samples. Tatyana Tuneva - species identification.