Records by time
Zodariidae 0-19001901-19501951-20002001-2018
Zodarion rubidum Simon, 1914 Not endangered 21x 53x 74x

Zodarion rubidum Simon, 1914

Czech namemravčík skalní
Threat levelNot endangered
Records74 nálezů, 25 kvadrátů
First record 1979, A. Kůrka, Kůrka 2000b
Last record 2020 , Radek Šich
Distribution areaEuropean - ME
Phytogeographic areaThermo
Původnost stanovišťclimax, semi-natural
Humidityvery dry
StratumGround layer
Osvětlení stanovišťopen
Hojnost výskyturare probably
Altitude200-400

Bibliography

© Oto Zimmermann
Predators should be selected to maximize their fitness by catching the most profitable prey. As predators grow in size, they often shift their preferences to larger prey during the course of development. Alike generalist predators, specialized predators should also shift to larger prey within the pool of focal prey. Here, we have studied the natural diet of a specialized ant‐eating spider Zodarion rubidum by means of molecular methods. We tested the hypothesis of a trophic shift during postembryonic ontogenesis and if there is a difference in the diet between sexes due to sexual dimorphism. In addition, a feeding trial was performed to estimate the time at which prey DNA can be detected. The diet of all stages consisted solely of ants (nine genera), thus confirming their strict ant specialization. There was no shift in prey size or prey type during ontogenetic development, but the diversity of prey declined with age. In adult males, very few prey were detected. The feeding trial showed that prey DNA can be detected inside the spider’s gut up  to 2 weeks after feeding.

© Ondřej Machač
Within-species variation in body size of males and females of an ant-eating spider Zodarion rubidum was studied by analysing 15 populations across Europe. The relationship between the body size of both sexes was allometric with female-biased sexual size dimorphism. Body size of males did not change with latitude or temperature, while that of females changed significantly with temperature. Larger females were found in regions with higher temperature which is presumably a result of an optimal climate: higher temperature and longer season provide higher prey availability which accelerates the growth rate of females, leading to a larger body size. As female size varied more than male size, a sexual size dimorphism cline was observed in Zodarion rubidum. Larger sexual size dimorphism was found in warmer regions. These results thus suggest that environmental conditions (temperature) influence intraspecific variation in sexual size dimorphism in Zodarion rubidum.


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By collecting method (54 used records)
Zodarion rubidum Simon, 1914 ESMalesFemalesJuvenilesRecords
Individuální sběr17510
Zemní past8139032
Pozorování7804
Prosev13378
 MalesFemalesJuvenilesRecords

By biotope (31 used records)
Zodarion rubidum Simon, 1914 ESMalesFemalesJuvenilesRecords
Skládky0101
Nízké xerofilní křoviny10202
Kamenolom1001
Ruderály5501
haldy a výsypky0101
pískovny8502
zahrady2301
Devětsilové lemy horských toků, bylinné porosty břehů0001
písčiny0001
ostatní pole1001
kamenolomy0202
Železniční náspy10354
Cesty, silnice10002
Xerotermní travinobylinná společenstva2001
Písečné přesypy0102
Xerotermy na jiných podkladech3748
 MalesFemalesJuvenilesRecords