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Distribution of the nurse species pycnophyllum molle J.Rémy and P. Weberbaueri Muschl. in the Andean dry puna (Arequipa district - Southern Peru): role of topographic/soil variability and disturbance regime

Catorci A., Piermarteri K., Tardella F.

Polish Journal of Ecology

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2014

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Vol. 62, nr 2

385--390

EN

The dry Puna is the widest pastoral ecosystem of the tropical alpine Andes, characterized by harsh environmental conditions (long and intense drought stress periods and unfertile soils) and grazed by wild and domestic camelids. In these conditions, facilitation is of key importance in plant diversity conservation. Indeed, facilitation is a positive plant-plant interaction by which the so called nurse species provide environmental amelioration of harsh conditions and/or refuge to other plants (beneficiary species), which otherwise might fail to establish. The research aims were to understand which ecological variables affect the distribution of the potential nurse cushion species Pycnophyllum molle J. Rémy and P. weberbaueri Muschl., and if these species are affected by grazing disturbance. The study area (4000–4900 m a.s.l.) is located in the southern Peruvian Andes. Data of species cover, topographic and soil features, besides type of disturbance were collected along transects. We used canonical redundancy analysis to understand the relations between the cover of the two Pycnophyllum species and the above mentioned constraining variables. Results indicate that both the Pycnophyllum species grow on sandy loam, moderately acid soils, with low organic matter and very poor nitrogen content, and avoid high disturbance intensities. P. molle is more sensitive than P. weberbaueri to disturbance, and grows on relatively more fertile soils, also at higher altitudes and on steeper slopes characterized by greater rockiness.

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Eocene graphoglyptids from shallow-marine, highenergy, organic-rich, and bioturbated turbidites, Fuegian Andes, Argentina

Olivero E., Lopez C. M., Torres Carbonell P., Malumian N.

Acta Geologica Polonica

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2010

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Vol. 60, no. 1

77-91

EN

Graphoglyptids are diagnostic ichnofossils of the Paleodictyon ichnosubfacies (Nereites ichnofacies), which is well represented in deep-marine Mesozoic.Cenozoic thin-bedded turbidites. However, unusual shallow-water records of Mesozoic-Cenozoic Paleodictyon and particular preservational restrictions of graphoglyptid burrows introduce the question of whether graphoglyptids are reliable bathymetric indicators. We document and discuss another unusual graphoglyptid association preserved in shallow-marine, high-energy, organic-rich, and bioturbated turbidites of leveed channels in the upper middle Eocene CCa member, Cerro Colorado Formation, Fuegian Andes. The member includes the facies associations: 1) mudstones, 2) interbedded mudstones and thin-bedded Tbc turbidites, and 3) thick-bedded sandstones andmudstones. Facies association 3), interpreted as channel deposits, records at least three horizons with Desmograpton, Glockerichnus, Helicolithus, Helminthorhaphe, Megagrapton, Paleodictyon and Urohelminthoida. Associated beds are lenticular, channeled sandstone turbidites with marked basal erosion surfaces and variable proportions of interbedded mudstone-sandstone with high content of plant debris. Trace fossils in the channeled sandstones are dominated by Ophiomorpha rudis and O. annulata; mudstones within the thick-bedded mudstone-sandstone beds bear Nereites, Phycosiphon, Zoophycos and Paradictyodora, with subordinate Schaubcylindrichnus, Tasselia and Scolicia. The unusual preservation of limited graphoglyptid-bearing beds within a highly energetic and bioturbated interval seems to support the concept that preservational restrictions on graphoglyptid burrows could be locally more important than bathymetric constraints.

3

Flora mszaków i porostów Kanionu Colca (Peru) - badania rekonesansowe

Cykowska B., Flakus A.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

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2008

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T. 34, z. 2/1

193-203

PL

Artykuł jest pierwszym doniesieniem o długofalowym projekcie, mającym na celu poznanie różnorodności gatunkowej mszaków i porostów na obszarze projektowanego Parku Narodowego Kanion Colca i Dolina Wulkanów (Arequipa, Peru) oraz ich ekologii w kontekście zróżnicowania środowiska abiotycznego. Środowisko przyrodnicze tego najgłębszego kanionu świata nie doczekało się dotychczas kompleksowego opracowania flory mszaków i porostów. Już na podstawie wstępnych obserwacji stwierdzono ich znaczący udział w szacie roślinnej tego obszaru oraz potencjalnie duże bogactwo gatunkowe wynikające ze znacznego zróżnicowania siedlisk. Istotnym wynikiem rozpoczętych badań jest odkrycie pierwszych stanowisk porostów Lecanora leuckertiana w Ameryce Południowej i Lepraria impossibilis na Półkuli Południowej. Dalsze badania powinny zaowocować opracowaniem pełnej listy gatunków mszaków i porostów Parku Narodowego Kanion Colca i Dolina Wulkanów oraz dostarczyć argumentów do ochrony jego unikalnej przyrody.

EN

The paper is a preliminary report of a long-term project that aims at completing the flora of bryophytes and lichens in the projected Canyon Colca and the Valley of the Volcanoes National Park area (Arequipa, Peru). The bryophytes and lichens of this deepest canyon in the world has remained underexplored for a long time. These organisms dominate in the vegetation cover and exhibit a remarkable species diversity resulting from habitat richness in this area. The important result of preliminary studies was discovered the first records of lichens Lecanora leuckertiana in South America and Lepraria impossibilis in the Southern Hemisphere. Further researeh should result in completing floristic lists of bryophytes and lichens of the Canyon Colca and the Valley of the Volcanoes National Park and should provide arguments for the protection of its unique wild life.

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Transandyjska Kolej Centralna na tle epoki

Orłowski B.

Przegląd Komunikacyjny

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1999

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R. 38, nr 3

17-22

PL

Kwalifikacje i kompetencje zawodowe Ernesta Malinowskiego na tle XIX-wiecznych realiów w dziedzinie kszta?cenia inżynierów. Specyfika przeprowadzenia linii kolejowej przez Andy. Rozwiązania przyjęte przez inż. E. Malinowskiego i uzasadnienie takiego właśnie ich wyboru. Oryginalność pomysłu, projektu i realizacji na tle ówczesnych osiagnięć techniki w budowie kolei na świecie.