Porrhomma profundum M. Dahl, 1939 [plachetnatka hlubinná]

Kvadráty: 5249 6666 6474

	Records by time
Linyphiidae	0-1900	1901-1950	1951-2000	2001+	∑
Porrhomma profundum M. Dahl, 1939 Ohrožené druhy				6×	6×

Porrhomma profundum M. Dahl, 1939

Czech name	plachetnatka hlubinná
Threat level	Ohrožené druhy
Records	6 nálezů, 3 kvadrátů
Last record	2016 , Michal Holec
Phytogeographic area	Meso (Preference: Vysoká) Mezofytikum. Oblast zonální vegetace a květeny temperátního pásma, tedy oblast opadavých listnatých lesů. Značnou část této oblasti zaujímají dnes pole a louky. Sem je přiřazena i východní část českého Termofytika.
Původnost stanovišť	climax (Preference: Vysoká) Klimaxová stanoviště, která jsou minimálně narušena činností člověka: původní horská stanoviště, původní a přirozené lesy, mokřady, rašeliniště, skalní stepi a lesostepi, váté písky, kamenité sutě, skály apod.
Humidity	humid Vlhká. Často stanoviště s vysokou hladinou spodní vody: vlhké louky, lužní lesy, klimaxové a podmáčené smrčiny, vnitřní prostory kamenitých sutí.
Stratum	Underground (Preference: Vysoká) Podzemí. Nehluboké podzemní prostory (půda, nory drobných savců, hnízda mravenců, puklinové systémy, kamenité sutě), jeskyně.
Osvětlení stanovišť	dark (Preference: Vysoká) Částečně má charakter mikrobiotopu: skalní výklenky, převisy pod břehy potoků a strží, nehluboké a hluboké podzemní prostory.
Hojnost výskytu	very rare Velmi vzácný. Druh vyskytující se na velmi malém počtu mapových polí. Výskyt je obvykle vázán na jediné pohoří či na unikátní stanoviště. I počet získaných jedinců je většinou velmi malý.
Altitude	400-700

Bibliography

The food web in a subterranean ecosystem is driven by intraguild predation

Trophic interactions of cave arthropods have been understudied. We used molecular methods (NGS) to decipher the food web in the subterranean ecosystem of the Ardovská Cave (Western Carpathians, Slovakia). We collected five arthropod predators of the species Parasitus loricatus (gamasid mites), Eukoenenia spelaea (palpigrades), Quedius mesomelinus (beetles), and Porrhomma profundum and Centromerus cavernarum (both spiders) and prey belonging to several orders. Various arthropod orders were exploited as prey, and trophic interactions differed among the predators. Linear models were used to compare absolute and relative prey body sizes among the predators. Quedius exploited relatively small prey, while Eukoenenia and Parasitus fed on relatively large prey. Exploitation of eggs or cadavers is discussed. In contrast to previous studies, Eukoenenia was found to be carnivorous. A high proportion of intraguild predation was found in all predators. Intraspecific consumption (most likely cannibalism) was detected only in mites and beetles. Using Pianka’s index, the highest trophic niche overlaps were found between Porrhomma and Parasitus and between Centromerus and Eukoenenia, while the lowest niche overlap was found between Parasitus and Quedius. Contrary to what we expected, the high availability of Diptera and Isopoda as a potential prey in the studied system was not corroborated. Our work demonstrates that intraguild diet plays an important role in predators occupying subterranean ecosystems.

Three-dimensional modelling in arachnology as exemplified using Porrhomma-species (Araneae: Linyphiidae)

Three-dimensional modelling has shown its importance in many fields, including zoological systematics. It is difficult to distinguish females of Porrhomma egeria Simon, 1884 and Porrhomma campbelli F. O. Pickard-Cambridge, 1894 according to only dorsal and ventral views of the vulva. The same is true for the pair Porrhomma microps (Roewer, 1931) and Porrhomma profundum Dahl, 1939. A caudal view is necessary to distinguish the vulvae of these species pairs. A 3D model combines all important views of the female genitalia (ventral, dorsal, lateral and caudal) into a single unit.

A review of the spider genus Porrhomma (Araneae, Linyphiidae)

The spider genus Porrhomma has been revised. it now includes 24 species.

Two new species are described:

Porrhomma altaica new species from the Altai Mountains
Porrhomma nekolai new species from eastern Asia and North America

Bathyphantes charpentieri Lebert, 1877 was removed from synonymy with Porrhomma microphthalmum (O. Pickard-Cambridge, 1871).

The following new synonymies are proposed:

Bathyphantes charpentieri Lebert, 1877 is a junior synonym of Porrhomma convexum (Westring, 1851) new synonymy
Porrhomma gertschi Hackman, 1954 is a junior synonym of Porrhomma terrestre (Emerton, 1882) new synonymy
Porrhomma myops Simon, 1884 is a junior synonym of Porrhomma rosenhaueri (L. Koch, 1872) new synonymy
Porrhomma ocella Chamberlin & Ivie, 1943 is a junior syn onym of Porrhomma convexum (Westring, 1851) new synonymy
Porrhomma omissum Miller, 1971 is a junior synonym of Porrhomma egeria Simon, 1884 new synonymy
Porrhomma pallidum affinis Miller & Kratochvíl, 1940 is a junior synonym of Porrhomma pallidum Jackson, 1913 new synonymy
Porrhomma sodonta (Chamberlin, 1949) is a junior synonym of Porrhomma convexum (Westring, 1851) new synonymy
The synonymy of Porrhomma macrochelis (Emerton, 1917) with Macrargus multesimus (O. Pickard-Cambridge, 1875) is supported
Porrhomma subterraneum Simon, 1884 is considered a nomen dubium, because it was described according to a juvenile specimen

To date, Porrhomma indecorum Simon, 1910 and Porrhomma marphaense Wunderlich, 1983 are only known from findings of females. They are considered to be species inquirenda, and their names are declared nomina dubia.

Keys are provided for males and females. Vulvae are drawn in dorsal, ventral and caudal views to understand their spatial structure.

Naši pavouci a biospeleologie.

Vývoj biospeleologie je poznamenán skutečností, že lidé jsou fascinováni tím, co v přístupných podzemních prostorách vidí. Vápencové jeskyně celého světa s bohatou krápníkovou výzdobou, jeskyně v solném krasu Íránu, jeskyně v křemenných pískovcích Guyanské vysočiny, jeskyně s obřími krystaly sádrovce v Mexiku – to všechno je pro nás úžasná nádhera. Není bez zajímavosti si uvědomit, že kdyby lidé podzemní prostory neosvětlili, nikdo nikdy by tu z našeho pohledu – krásu neviděl. Panuje tam naprostá tma a skuteční obyvatelé podzemních prostor nemají oči.

Statistics

By month

By altitude

By collecting method (6 used records)

Porrhomma profundum M. Dahl, 1939 EN	Males	Females	Juveniles	Records
Zemní past	6	12	0	3
Individuální sběr	2	3	0	3
	Males	Females	Juveniles	Records

By biotope (6 used records)

Porrhomma profundum M. Dahl, 1939 EN	Males	Females	Juveniles	Records
Jeskyně	1	8	0	1
Neurčeno	7	7	0	5
	Males	Females	Juveniles	Records

Porrhomma profundum M. Dahl, 1939 [plachetnatka hlubinná]

Genus: Porrhomma, Family: Linyphiidae