Insular Biogeography of Birds on Mountain-Tops in North Western Argentina

Nores, Manuel

doi:10.2307/2846073

Cited by 50 publications

(39 citation statements)

References 47 publications

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“…Infrequent immigration and rescue of dwindling populations can also limit species diversity on isolated islands. This simple conceptual model has been invoked widely to explain patterns of variation in species richness among oceanic and habitat islands differing in either size or isolation (Vuilleumier 1970, Brown 1971, Brown and Dinsmore 1988, Lomolino et al 1989, Nores 1995. This model has also been applied in conservation, particularly in studies of the consequences of habitat fragmentation (Simberloff and Gotelli 1984) and the design of natural reserves (Higgs 1981).…”

Section: Introductionmentioning

confidence: 99%

Direct effects of habitat area on interaction diversity in pollination webs

Sabatino

Maceira

Aizen

2010

Ecological Applications

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Abstract. Island biogeography theory predicts that species richness increases with habitat area and declines with isolation. We expand this framework to address changes in the number of links and species in pollination webs from 12 isolated hills, ranging in area from tens to thousands of hectares, immersed in the agriculture matrix of the Argentine Pampas. We also studied whether total interaction frequency is partitioned more evenly among individual links in richer webs. Our results reveal a direct effect of area on the number of links and species present in each pollination web. However, link richness increased twofold faster than species richness with area. These area effects were not confounded by sampling effort or correlated incidence of exotic species, despite widespread habitat disturbance. Habitat proximity, an inverse measure of isolation, had a marginally significant influence on link but not on species richness. Increased link number was associated with decreasing dominance by any particular interaction and increasing interaction evenness. Despite the strong area effect, a rich pollination web sampled from a small, protected sierra suggests that simple conservation measures, such as reduced grazing and fire suppression, may effectively preserve much local interaction diversity.

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Section: Introductionmentioning

confidence: 99%

Direct effects of habitat area on interaction diversity in pollination webs

Sabatino

Maceira

Aizen

2010

Ecological Applications

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“…Si comparamos estos resultados con el presente estudio, existe una baja similitud específica (21 %), aun así, estos autores mencionan que la avifauna tanto en número de especies residentes como migratorias de la región chaqueña, está asociada a la presencia de ciertos ambientes (sierras con arroyos y bosques nativos) que no se encuentran en otras provincias fitogeográficas. Por otra parte, Nores (1995) estudió la avifauna en ambientes puneños y del espinal en el sector sur-oeste del Parque Natural Provincial Valle Fértil, durante un hidroperíodo lluvioso (entre marzo 1990 y febrero 1991, con 510 mm de precipitación), y la riqueza específica que registró (18 especies) fue baja en similitud (27 %) con respecto a nuestros resultados. Por lo tanto, se reafirma la hipótesis de que entre ambientes característicos del Chaco Serrano y conservados, como los de este estudio, se esperan valores similares de riqueza y abundancia de aves.…”

Section: Discussionunclassified

“…En el Chaco Serrano de Argentina existen varios registros documentados sobre los aspectos biogeográficos de la avifauna (Ochoa de Masramón, 1983;Nores & Yzurieta, 1983;Olrog & Capllonch, 1986;Capurro & Bucher, 1988;Haene, Krapovickas, Moschione, & Gómez, 1995;Nores, 1995;Cid & Caviedes Vidal, 2005;Camperi, Darrieu & Juárez, 2008). Sin embargo, poco se conoce sobre las especies que componen la comunidad de aves en su sector austral; hasta el momento, no se dispone de estudios acerca de la variación estacional en función del hidroperíodo.…”

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Efecto de la estacionalidad y lluvias en la avifauna del Chaco Serrano Austral, Argentina

Fava

Acosta

Blanco

2017

RBT

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The effects of seasonality and precipitation in the avifauna of the Argentine Southern Chaco Serrano. In subtropical regions like the Chaco Serrano (33° S), rainfall has a marked seasonality, and water flood, caused by heavy rains, may have important consequences for dependent ecosystems. Conversely, the high pressure on available resources during dry periods can also affect the fauna diversity and distribution. Even though birds have shown to be excellent ecological indicators of these shifts in the environment, currently little is known about the avifauna of the Argentine Chaco Serrano phytogeographic district. Our aim was to study the resident bird population status in the Southern Chaco Serrano, its fluctuations in richness and abundance, and its relationship to seasonal variations, in monthly and annual hydroperiods. In order to assess the resident bird status over a two year period (2011 Mar.-2013 we carried out 18 sampling surveys during pre-breeding (spring), breeding (summer) and non breeding periods (autumn-winter), in the Northeastern part of the Valle Fértil Natural Park, San Juan province, Argentina. During each site survey, we recorded bird assemblages found in six transects, and obtained bird abundance and species diversity. A mixed general linear model was employed to evaluate relationships between the studied variables. We found a total of 98 species of birds belonging to 33 families (44 resident species, 23 spring visitors, six summer visitors, two winter visitors and 23 with scarce registers). We also registered 68 of these species in both hydroperiods, 28 only during rainy periods and only two during the dry period. Both richness and abundance showed the highest values during the pre-breeding and rainy seasons, while different tendencies were detected during the isolated monthly rainfalls. These changes in bird densities were associated with the arrival of migratory species, mainly spring visitors, and probably in relationship with their reproductive activity, and to seasonal fluctuations in food resources. The Southern Chaco Serrano is a subtropical semiarid place that seems to be an important breeding habitat for many migrant bird species, which in turn promoted seasonal changes in species density and diversity, mainly during rainy years. This work contributed to our understanding on the causes of richness and abundance variations on birds, and will contribute to this important group management and conservation in this area. Rev. Biol. Trop. 65 (3): 953-961. Epub 2017 September 01.

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“…Sin embargo, la correspondencia de los límites altitudinales del área ocupada y potencial y la caída de la probabilidad de ocurrencia fuera de esos límites, sugeriría que el rango geográfico de S. linearifolia respondería a algún tipo de condicionamiento ligado a la altitud, como se evidencia en otros sistemas altitudinalmente restringidos (e.g., Chunco et al, 2013). En relación a la distribución potencial inferida para las sierras de Córdoba, si bien se observa una continuidad climática y topográfica entre ambas serranías hacia el extremo norte de las Sierras Grandes, parecería que este cordón serrano puede constituir, en su porción de mayor altitud, una barrera a la dispersión entre las Sierras Chicas y las Cumbres de Gaspar, como ha sido previamente propuesto (Nores 1995). Es importante mencionar, que el área de ocurrencia predicha para la especie hacia el norte de las Sierras Grandes es un área intensamente estudiada en la que no se ha encontrado a S. linearifolia.…”

Section: Discussionunclassified

Rango geográfico y estructura espacial de linajes genéticos en Sophora linearifolia (Fabaceae), un arbusto endémico de las sierras centrales de Argentina.

Alercia

Giorgis

Funes

et al. 2017

Bol. Soc. Argent. Bot.

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Summary: Geographical range and spatial structure of genetic lineages in Sophora linearifolia (Fabaceae), an endemic shrub of Central Argentina. A large number of endemic species occur in the Sierras of Córdoba and San Luis. A significant group of them shows a disjunct geographic distribution between these two mountain regions. Until the present study, there were none genetic studies that allow us to infer historical processes underlying this geographical pattern. For this purpose, we characterize the distribution area and phylogeographic patterns of Sophora linearifolia, across its geographic range which includes Sierras Chicas (SC) and Cumbres de Gaspar (CG) in Córdoba and in the southwestern area of Sierras of San Luis (SL). We compared the current with the predicted species area of distribution using ecological niche modelling analysis. We also analyzed genetic variability and spatial structure of the DNA chloroplast marker trnH-psbA, and reconstructed the genealogical relationships among the retrieved haplotypes. Current and the predicted distribution agreed in showing a climatic/topographic disjunction between Sierras of Cordoba and San Luis hills, although the current distribution presents a disjunction between SC and CG in Córdoba, not shown in the potential distribution map. We obtained eight haplotypes with restricted distribution and low levels of genetic differentiation that were grouped into four phylogroups: SC, CG and two in SL. Our results indicate that S. linearifolia presents low dispersal ability and it would have recently diversified, suggesting a neoendemic taxon.Key words: Chloroplastidial DNA, biogeography, disjunct, distribution, ecological niche modelling, phylogeography, neoendemic, Sierras Pampeanas.Resumen: Las sierras de Córdoba y San Luis albergan una gran riqueza de especies endémicas. Un grupo importante de ellas muestra una distribución disyunta entre ambas serranías. Hasta la actualidad no existían estudios genéticos que permitieran inferir procesos históricos asociados a este patrón. Con este propósito caracterizamos el área de distribución y el patrón filogeográfico de Sophora linearifolia, abarcando todo su rango geográfico que incluye las Sierras Chicas (SC) y las Cumbres de Gaspar (CG) en Córdoba y el suroeste de las Sierras de San Luis (SL). Contrastamos la distribución actual con la distribución predicha a partir del modelado del nicho ecológico. Analizamos el nivel de variabilidad genética, la estructuración espacial del marcador de ADN plastidial trnH-psbA y reconstruimos las relaciones genealógicas entre los haplotipos. La distribución actual y la predicha mostraron una disyunción entre Córdoba y San Luis, pero la distribución actual presentó una disyunción entre SC y CG que no fue modelada en la distribución potencial. Se obtuvieron 8 haplotipos de distribución restringida con bajos niveles de diferenciación genética agrupados en 4 filogrupos: SC, CG y dos en SL. Nuestros resultados indican que S. linearifolia presentaría baja capacidad de dispersión y que se habría d...

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Insular Biogeography of Birds on Mountain-Tops in North Western Argentina

Cited by 50 publications

References 47 publications

Direct effects of habitat area on interaction diversity in pollination webs

Direct effects of habitat area on interaction diversity in pollination webs

Efecto de la estacionalidad y lluvias en la avifauna del Chaco Serrano Austral, Argentina

Rango geográfico y estructura espacial de linajes genéticos en Sophora linearifolia (Fabaceae), un arbusto endémico de las sierras centrales de Argentina.

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