Guillermo Suárez | National Scientific and Technical Research Council (original) (raw)

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Papers by Guillermo Suárez

It remains hotly debated whether latitudinal diversity gradients are common across taxonomic grou... more It remains hotly debated whether latitudinal diversity gradients are common across taxonomic groups and whether a single mechanism can explain such gradients. Investigating species richness (SR) patterns of European land plants, we determine whether SR increases with decreasing latitude, as predicted by theory, and whether the assembly mechanisms differ among taxonomic groups. SR increases towards the south in spermatophytes, but towards the north in ferns and bryophytes. SR patterns in spermatophytes are consistent with their patterns of beta diversity, with high levels of nestedness and turnover in the north and in the south, respectively, indicating species exclusion towards the north and increased opportunities for speciation in the south. Liverworts exhibit the highest levels of nestedness, suggesting that they represent the most sensitive group to the impact of past climate change. Nevertheless, although the extent of liverwort species turnover in the south is substantially and significantly lower than in spermatophytes, liverworts share with the latter a higher nestedness in the north and a higher turnover in the south, in contrast to mosses and ferns. The extent to which the similarity in the patterns displayed by spermatophytes and liverworts reflects a similar assembly mechanism remains, however, to be demonstrated. The existence of a latitudinal diversity gradient (LDG) peaking near the equator and decreasing towards the poles has been a persistent feature during the history of life on earth 1 (but see ref. 2). This gradient has been quoted as one of the few laws in ecology 3 , and it demonstrates remarkable consistency across geographic areas, scales, habitats , and taxonomic groups 4–7. Mounting evidence suggests that this convergence of distribution patterns across taxonomic groups is due to environmental forcing 8. On the one hand, macroclimate (primarily energy and water) is postulated to control species richness through the ecological sorting of regional and global species pools according to species climatic tolerances or by affecting rates of speciation 9. In particular, dry or cold environments are specifically challenging for plants because adaptations must evolve to enable the tolerance or avoidance of extremely low water potentials 10. In lineages that have successfully adapted to high-latitude environments, increased seasonal variability at higher latitudes is assumed to have resulted in broader thermal tolerances and consequently larger ranges: i.e., Rapoport's rule 11 .

Pohlia section Apalodictyon is taxonomically studied for Central and South America. Three species... more Pohlia section Apalodictyon is taxonomically studied for Central and South America. Three species are recognized in the study area (Pohlia lonchochaete, P. magnifica and P. wahlenbergii). Mniobryum bolivianum from Bolivia is proposed as a new synonym of P. wahlenbergii. Three new lectotypes are designated. We provide the first illustrations of P. lonchochaete and P. magnifica, two neglected species from southern South America and describe and illustrate all species observed. Distribution maps of the taxa in Latin America are presented.

Bryophyte Diversity and Evolution, 2005

Bryophyte Diversity and Evolution, 2003

Boletin de la Sociedad Argentina de Botanica

Rauiella niveo-calycina (Müll. Hal) Wijk & Marg. is proposed as a new synonym of R. praelonga (Sc... more Rauiella niveo-calycina (Müll. Hal) Wijk & Marg. is proposed as a new synonym of R. praelonga (Schimp. ex Besch) Wijk & Marg. The species treated is discussed briefly. Resumen: Rauiella niveo-calycina es un sinónimo nuevo de R. praelonga. R. niveo-calycina (Müll. Hal) Wijk & Marg. es propuesta en este trabajo como un sinónimo nuevo de R. praelonga (Schimp. ex Besch) Wijk & Marg. La especie tratada es brevemente discutida. Palabras clave: Rauiella niveo-calycina, R. praelonga, Thuidiaceae, Neotrópico. BUCK, W. R. 1991. The generic placement of Anomodon lagoensis. The Bryologist 94: 82-83.

The genus Holomitrium Brid. is recorded for first time from Argentina and Uruguay. Only one speci... more The genus Holomitrium Brid. is recorded for first time from Argentina and Uruguay. Only one species, H. arboreum, is present in the study area. A brief description, photographs and illustrations of the species are provided.

The genus Pohlia is reported as new genus for Uruguay; where it is represented by two species: P.... more The genus Pohlia is reported as new genus for Uruguay; where it is represented by two species: P. wahlenbergii (F.Weber & D.Mohr) A.L.Andrews and P. tenuifolia (A. Jaeger) Broth. P. tenuifolia is also recorded as new to Bolivia and Colombia. P. loriformis (Herzog) F.J. Herman, a poorly known species, described from Bolivia, is proposed as a new synonym of P. tenuifolia. A lectotype for P. loriformis is here designed. A key to the species from Uruguay is given. The South American synonyms, brief comments, distribution and illustrations for P. tenuifolia are presented.

The Bryologist, 2010

New combinations are proposed for three Neotropical moss species following the transfer of Barbul... more New combinations are proposed for three Neotropical moss species following the transfer of Barbula uncinicoma to Gertrudiella and of Cyrto-hypnum sharpii to Pelekium.

Boletín de la Sociedad Argentina …, 2010

Darwiniana, 2009

El género Pilopogon esta representado por dos especies en Argentina: P. schilleri y P. guadalupen... more El género Pilopogon esta representado por dos especies en Argentina: P. schilleri y P. guadalupensis. Pilopogon schilleri es conocido desde Río Negro hasta Tierra del Fuego y P. guadalupensis para Jujuy. Este último constituye el primer registro para la Argentina, y se designa aquí su lectotipo. Se incluyen descripciones, fotomicrografías de caracteres específicos, mapas de distribución y una clave para las especies argentinas.

It remains hotly debated whether latitudinal diversity gradients are common across taxonomic grou... more It remains hotly debated whether latitudinal diversity gradients are common across taxonomic groups and whether a single mechanism can explain such gradients. Investigating species richness (SR) patterns of European land plants, we determine whether SR increases with decreasing latitude, as predicted by theory, and whether the assembly mechanisms differ among taxonomic groups. SR increases towards the south in spermatophytes, but towards the north in ferns and bryophytes. SR patterns in spermatophytes are consistent with their patterns of beta diversity, with high levels of nestedness and turnover in the north and in the south, respectively, indicating species exclusion towards the north and increased opportunities for speciation in the south. Liverworts exhibit the highest levels of nestedness, suggesting that they represent the most sensitive group to the impact of past climate change. Nevertheless, although the extent of liverwort species turnover in the south is substantially and significantly lower than in spermatophytes, liverworts share with the latter a higher nestedness in the north and a higher turnover in the south, in contrast to mosses and ferns. The extent to which the similarity in the patterns displayed by spermatophytes and liverworts reflects a similar assembly mechanism remains, however, to be demonstrated. The existence of a latitudinal diversity gradient (LDG) peaking near the equator and decreasing towards the poles has been a persistent feature during the history of life on earth 1 (but see ref. 2). This gradient has been quoted as one of the few laws in ecology 3 , and it demonstrates remarkable consistency across geographic areas, scales, habitats , and taxonomic groups 4–7. Mounting evidence suggests that this convergence of distribution patterns across taxonomic groups is due to environmental forcing 8. On the one hand, macroclimate (primarily energy and water) is postulated to control species richness through the ecological sorting of regional and global species pools according to species climatic tolerances or by affecting rates of speciation 9. In particular, dry or cold environments are specifically challenging for plants because adaptations must evolve to enable the tolerance or avoidance of extremely low water potentials 10. In lineages that have successfully adapted to high-latitude environments, increased seasonal variability at higher latitudes is assumed to have resulted in broader thermal tolerances and consequently larger ranges: i.e., Rapoport's rule 11 .

Pohlia section Apalodictyon is taxonomically studied for Central and South America. Three species... more Pohlia section Apalodictyon is taxonomically studied for Central and South America. Three species are recognized in the study area (Pohlia lonchochaete, P. magnifica and P. wahlenbergii). Mniobryum bolivianum from Bolivia is proposed as a new synonym of P. wahlenbergii. Three new lectotypes are designated. We provide the first illustrations of P. lonchochaete and P. magnifica, two neglected species from southern South America and describe and illustrate all species observed. Distribution maps of the taxa in Latin America are presented.

Bryophyte Diversity and Evolution, 2005

Bryophyte Diversity and Evolution, 2003

Boletin de la Sociedad Argentina de Botanica

Rauiella niveo-calycina (Müll. Hal) Wijk & Marg. is proposed as a new synonym of R. praelonga (Sc... more Rauiella niveo-calycina (Müll. Hal) Wijk & Marg. is proposed as a new synonym of R. praelonga (Schimp. ex Besch) Wijk & Marg. The species treated is discussed briefly. Resumen: Rauiella niveo-calycina es un sinónimo nuevo de R. praelonga. R. niveo-calycina (Müll. Hal) Wijk & Marg. es propuesta en este trabajo como un sinónimo nuevo de R. praelonga (Schimp. ex Besch) Wijk & Marg. La especie tratada es brevemente discutida. Palabras clave: Rauiella niveo-calycina, R. praelonga, Thuidiaceae, Neotrópico. BUCK, W. R. 1991. The generic placement of Anomodon lagoensis. The Bryologist 94: 82-83.

The genus Holomitrium Brid. is recorded for first time from Argentina and Uruguay. Only one speci... more The genus Holomitrium Brid. is recorded for first time from Argentina and Uruguay. Only one species, H. arboreum, is present in the study area. A brief description, photographs and illustrations of the species are provided.

The genus Pohlia is reported as new genus for Uruguay; where it is represented by two species: P.... more The genus Pohlia is reported as new genus for Uruguay; where it is represented by two species: P. wahlenbergii (F.Weber & D.Mohr) A.L.Andrews and P. tenuifolia (A. Jaeger) Broth. P. tenuifolia is also recorded as new to Bolivia and Colombia. P. loriformis (Herzog) F.J. Herman, a poorly known species, described from Bolivia, is proposed as a new synonym of P. tenuifolia. A lectotype for P. loriformis is here designed. A key to the species from Uruguay is given. The South American synonyms, brief comments, distribution and illustrations for P. tenuifolia are presented.

The Bryologist, 2010

New combinations are proposed for three Neotropical moss species following the transfer of Barbul... more New combinations are proposed for three Neotropical moss species following the transfer of Barbula uncinicoma to Gertrudiella and of Cyrto-hypnum sharpii to Pelekium.

Boletín de la Sociedad Argentina …, 2010

Darwiniana, 2009

El género Pilopogon esta representado por dos especies en Argentina: P. schilleri y P. guadalupen... more El género Pilopogon esta representado por dos especies en Argentina: P. schilleri y P. guadalupensis. Pilopogon schilleri es conocido desde Río Negro hasta Tierra del Fuego y P. guadalupensis para Jujuy. Este último constituye el primer registro para la Argentina, y se designa aquí su lectotipo. Se incluyen descripciones, fotomicrografías de caracteres específicos, mapas de distribución y una clave para las especies argentinas.