scholarly journals The avifauna of the Río Machariapo dry forest, northern La Paz department, Bolivia: a preliminary investigation

1993 ◽  
Vol 3 (2) ◽  
pp. 105-117 ◽  
Author(s):  
Mark Pearman
Keyword(s):  
Preliminary Investigation ◽  
Bird Species ◽  
Dry Forest ◽  
La Paz ◽  
High Conservation ◽  
Empidonax Traillii ◽  
Del Rio

SummaryIn March 1993, a survey of dry forest along the Río Machariapo, northern La Paz department, Bolivia, resulted in seven new bird species for the department, including some range extensions of several hundred kilometres: Coccyzus erythropthalmus, Otus guatemalae, Poecilurus scutatus, Formicivora melanogaster, Empidonax traillii alnorum, Nemosia pileata and Conirostrum speciosum. A probable new Herpsilochmus antwren was collected. These discoveries are of high conservation interest, especially as the La Paz - Cobija road is to be constructed through the Machariapo Valley, with work resuming in May 1993 and already very close to the head of the valley. Thus several new plant and bird taxa may be lost through deforestation even before they can be described.Un estudio del bosque seco a lo largo del Río Machariapo en el norte del Departamento de La Paz, Bolivia, realizado en marzo de 1993, trajo como resultado el descubrimiento de siete nuevas especies de aves en este departamento, incluyendo algunas ampliaciones, de unos cien kilómetros, del área de distribución conocida: Coccyzus erythropthalmus, Otus guatemalae, Poecilurus scutatus, Formicivora melanogaster, Empidonax traillii alnorum, Nemosia pileata y Conirostrum speciosum. También se recolectó un Herpsilochmus sp. que es probablemente una nueva especie. Estos nuevas descubrimientos son de alto interés para la conservación, especialmente porque se está construyendo una carretera desde La Paz a Cobija por el Valle Machariapo. La construcción va a continuar en mayo de 1993 y actualmente esta se encuentra muy cerca del principio del valle. De esta manera nuevos taxa de plantas y aves podrian desaparecer a causa de deforestación, incluso antes de que se pudieran describir totalmente.

scholarly journals Bolivia has the opportunity to create the planet's richest park for terrestrial biota

1995 ◽  
Vol 5 (2-3) ◽  
pp. 181-199 ◽  
Author(s):  
J. V. Remsen ◽  
T. A. Parker
Keyword(s):  
Amazon Basin ◽  
Bird Species ◽  
Montane Forest ◽  
Dry Forest ◽  
La Paz ◽  
Lowland Tropical Forest ◽  
The Andes ◽  
Tropical Areas ◽  
Threatened Habitats ◽  
Forest Habitats

SummaryEstablishing a reserve of approximately 10,000 km at a strategic location in depto. La Paz, northern Bolivia, would create the planet's richest park for birds and presumably all other forest-dwelling biota that reach peak diversity at tropical latitudes. By connecting puna and montane forest habitats of the Andes with lowland tropical forest and savannas of the Amazon basin, we predict that the proposed reserve would contain at least 1,088 bird species, or roughly 11% of all bird species on the planet. Among these are many threatened species and species with relatively small geographical ranges. The proposed reserve would also include threatened habitats, such as lower montane forest, dry forest, and grassland.El establecimiento de una reserva de aproximadamente 10.000 km en un lugar estratégico en el departamento de La Paz, Bolivia, crearía el parque de major riqueza de aves en el planeta. Así es de suponer que la flora y fauna que habitan en la área, llegan a su grado máximo de diversidad en las latitudes tropicales. Conectando puna, los hábitats de bosque tropical (áreas bajas) y sabanas de la cuenca del Amazonas, predecimos que la reserva que se propone tendría a lo menos 1.088 especies de aves, o aproximadamente 11% de todas las especies de aves del planeta. Dentro de estas hay muchas especies amenazadas y especies con áreas de rango geográfico muy restringido. Además la reserva que se propone también incluiría hábitats amenazados, como bosque montano, bosque seco y pajonales tropicales.

scholarly journals Fruiting phenology and consumption by birds in Ficus calyptroceras (Miq.) Miq. (Moraceae)

2002 ◽  
Vol 62 (2) ◽  
pp. 339-346 ◽  
Author(s):  
J. RAGUSA-NETTO
Keyword(s):  
Food Resource ◽  
Bird Species ◽  
Dry Season ◽  
Dry Forest ◽  
Wet Season ◽  
Frugivorous Birds ◽  
Fruiting Phenology ◽  
Dry Seasons ◽  
Seed Dispersers ◽  
Wet And Dry Seasons

Figs are a remarkable food resource to frugivores, mainly in periods of general fruit scarcity. Ficus calyptroceras Miq. (Moraceae) is the only fig species in a type of dry forest in western Brazil. In this study I examined the fruiting pattern as well as fig consumption by birds in F. calyptroceras. Although rainfall was highly seasonal, fruiting was aseasonal, since the monthly proportion of fruiting trees ranged from 4% to 14% (N = 50 trees). I recorded 22 bird species feeding on figs. In the wet season 20 bird species ate figs, while in the dry season 13 did. Parrots were the most important consumers. This group removed 72% and 40% of the figs consumed in the wet and dry seasons, respectively. No bird species increases fig consumption from dry to wet season. However, a group of bird species assumed as seed dispersers largely increases fig consumption from wet to dry season, suggesting the importance of this resource in the period of fruit scarcity. The results of this study points out the remarkable role that F. calyptroceras plays to frugivorous birds, in such a dry forest, since its fruits were widely consumed and were available all year round.

scholarly journals Testimonio y representación durante el Sitio de La Intendencia de La Paz en 1782 en las postrimerías de La insurgencia de Túpac Amaru II

2020 ◽  
Vol 63 (2) ◽  
pp. 166-174
Author(s):  
Ricardo Pinto-Bazurco Mendoza
Keyword(s):  
Rio De La Plata ◽  
Río De La Plata ◽  
La Paz ◽  
La Plata ◽  
Del Rio

Desde el punto de vista hist6rico el analisis de fuentes "no oficiales" permite escudriñar algunos hechos y personajes an6nimos inmersos en su propia dinamica y significado. Como es el caso que se recoge del testimonio epistolar de un poblador de la Intendencia de La Paz (Virreinato del Río de la Plata) en l782 durante la etapa final del levantamiento iniciado por Tupac Amaru II. Cuyo testimonio, ademas, contribuye y enriquece el analisis del proceso de construcci6n de los sistemas de representaciones en medio de un periodo de grandes cambios e impacto social en las postrimerías del siglo XVIII en el sur andino.

scholarly journals Description of New American Carduelis/Spinus Bird Species in La Paz (Bolivia): C./S. lapazensis.

2020 ◽  
Vol 13 (1) ◽  
pp. 24-33
Author(s):  
Antonio Arnaiz-Villena ◽  
Valentín Ruiz-del-Valle ◽  
Fabio Suarez-Trujillo ◽  
Adrian Lopez-Nares ◽  
Alvaro Callado ◽  
...  
Keyword(s):  
New Species ◽  
North America ◽  
Bird Species ◽  
South American ◽  
Cyt B ◽  
Species Definition ◽  
La Paz ◽  
Evolutionary Radiation ◽  
And Behavior ◽  
A New Species

Introduction: South American siskins (Genus Carduelis/Spinus) are the outcome of regional evolutionary radiation from an extant (or other extinct) species: C. notata, a North America siskin, which thrives in Mexico subtropical areas and is parental of one of the three described North American siskin radiations. Methods: Speciation and/or subspeciation of this South American siskin radiation have probably occurred during Pleistocene Epoch. In the present paper, a new species/subspecies akin to C./S. atrata is described by genetic and phenotypic parameters: this new species/subspecies was previously considered a subspecies of C./S. xanthogastra, which thrives further North and is separated about 1,762 km, 1,094 miles, from this described subspecies, Carduelis/ Spinus xanthogastra stejnegeri. Results: Our genetic study using mt cyt b, phenotypic and behavior observations show that this putative C./S. xanthogastra subspecies is either a different species or a C./S. atrata subspecies; we have proposed a provisional name for this finch, C./S. lapazensis, instead of C./S. x. stejnegeri. Conclusion: Species definition is movable and controversial, and it is uncertain in South American siskins, which all show a close genetic and phenotypical relationship, which may be still immersed in speciation processes since Pleistocene Epoch.

scholarly journals Contenido de Metales Pesados en Tejidos de Sábalos (Prochilodus Lineatus) del Río Pilcomayo, Misión La Paz, Provincia de Salta

2005 ◽  
Vol 2 (32) ◽  
pp. 141-145 ◽  
Author(s):  
Carolina Elena Rosenberg ◽  
Bruno Nicolás Carpinetti ◽  
Carina Apartín
Keyword(s):  
La Paz ◽  
Prochilodus Lineatus ◽  
Del Rio

Seasonal use of waterholes and pathways by macrofauna in the dry forest of Costa Rica

2019 ◽  
Vol 35 (2) ◽  
pp. 68-73 ◽  
Author(s):  
Victor H. Montalvo ◽  
Carolina Sáenz-Bolaños ◽  
Luis D. Alfaro ◽  
Juan C. Cruz ◽  
Flavio H. Guimarães-Rodrigues ◽  
...  
Keyword(s):  
Costa Rica ◽  
Linear Models ◽  
Bird Species ◽  
Dry Forest ◽  
Ecological Understanding ◽  
Large Bird ◽  
Temporal And Spatial ◽  
Trail Cameras ◽  
Almost All ◽  
North Western

AbstractTemporal and spatial scarcity of water in semi-arid and seasonal ecosystems often leads to changes in movements and behaviour of large vertebrates, and in the neotropics this dynamic is poorly understood due to logistical and methodological limitations. Here we used camera trapping to elucidate variation in patterns of seasonal use of waterholes and pathways by 10 large-mammal and four large-bird species in the dry forest of north-western Costa Rica. From 2011 to 2015, we deployed trail cameras at 50 locations, including waterholes and three types of pathway (roads, human trails and animal paths). We used Generalized Linear Models to evaluate the effect of location and seasonality on the rates at which independent photographs were taken. We found interacting effects of location and seasonality for the capuchin monkey (Cebus capucinus), the tiger heron (Trigrisoma mexicanum), the white-tailed deer (Odocoileus virginianus) and the tapir (Tapirus bairdii) suggesting that these species were the most influenced by waterholes during the dry season. Comparison of waterhole sites and specific types of pathways (roads, animal paths and human trails) showed that location influenced photo-capture rates of almost all species, suggesting a useful insight to avoid and account for bias in camera trap studies. Furthering our ecological understanding of seasonal water regimes and large vertebrates’ behaviours allow for better understanding of the consequences of climate change on them.

Hollow-using vertebrate fauna of Tasmania: distribution, hollow requirements and conservation status

2008 ◽  
Vol 56 (5) ◽  
pp. 323 ◽  
Author(s):  
Amelia J. Koch ◽  
Sarah A. Munks ◽  
Eric J. Woehler
Keyword(s):  
Conservation Status ◽  
National Level ◽  
Bird Species ◽  
The State ◽  
Dry Forest ◽  
Considerable Proportion ◽  
Vertebrate Fauna ◽  
Number Of Species ◽  
Arboreal Marsupials ◽  
Regional Forest

In Tasmania, a considerable proportion of the forested landscape is available for land clearance and production forestry, which has and will continue to result in a decline in hollow availability unless managed appropriately. All hollow-using species are listed as having priority status under the Tasmanian Regional Forest Agreement. To ensure the habitat for hollow-using fauna is managed effectively, we first have to understand the requirements of the species involved. This paper is a review of the distribution, hollow requirements and conservation status of the five species of arboreal marsupials, eight species of bats and 29 bird species that use hollows in Tasmania. The number of species that use hollows is lower than in many other areas of Australia, but these species represent a large proportion of the vertebrate fauna of Tasmania. Three of these species and nine subspecies are endemic to Tasmania and seven are exotic. Four bird species are listed as Threatened at the state and/or national level. Twenty-five of Tasmania’s hollow-using species are capable of using small hollows, 14 can use medium-sized hollows and three bird species are limited to using large hollows. Current records indicate that the highest diversity of hollow-using species is associated with dry forest areas.

scholarly journals Diets of Insectivorous Birds Along the Colorado River in Grand Canyon, Arizona

The Condor ◽  
2004 ◽  
Vol 106 (1) ◽  
pp. 106-115 ◽  
Author(s):  
Helen K. Yard ◽  
Charles Van Riper ◽  
Bryan T. Brown ◽  
Michael J. Kearsley
Keyword(s):  
Colorado River ◽  
Bird Species ◽  
Grand Canyon ◽  
Dendroica Petechia ◽  
Tamarix Chinensis ◽  
Vegetation Zone ◽  
Yellow Warbler ◽  
Icteria Virens ◽  
Del Rio ◽  
Prey Items

Abstract We examined diets of six insectivorous bird species (n = 202 individuals) from two vegetation zones along the Colorado River in Grand Canyon National Park, Arizona, 1994. All bird species consumed similar quantities of caterpillars and beetles, but use of other prey taxa varied. Non-native leafhoppers (Opsius stactagolus) specific to non-native tamarisk (Tamarix chinensis) substantially augmented Lucy's Warbler (Vermivora luciae) diets (49%), while ants comprised 82% of Yellow-breasted Chat (Icteria virens) diets. Yellow Warbler (Dendroica petechia) diets were composed of 45% aquatic midges. All bird species consumed the non-native leafhopper specific to tamarisk. Comparison of bird diets with availability of arthropod prey from aquatic and terrestrial origins showed terrestrial insects comprised 91% of all avian diets compared to 9% of prey from aquatic origin. Seasonal shifts in arthropod prey occurred in diets of three bird species, although no seasonal shifts were detected in arthropods sampled in vegetation indicating that at least three bird species were not selecting prey in proportion to its abundance. All bird species had higher prey overlap with arthropods collected in the native, mesquite-acacia vegetation zone which contained higher arthropod diversity and better prey items (i.e., Lepidoptera). Lucy's Warbler and Yellow Warbler consumed high proportions of prey items found in greatest abundance in the tamarisk-dominated vegetation zone that has been established since the construction of Glen Canyon Dam. These species appeared to exhibit ecological plasticity in response to an anthropogenic increase in prey resources. Dieta de Aves Insectívoras a lo largo del Río Colorado en el Gran Cañon, Arizona Resumen. Examinamos la dieta de seis especies de aves insectívoras (n = 202 individuos) de dos zonas de vegetación a lo largo del Río Colorado en el Parque Nacional del Gran Cañon, Arizona, en 1994. Todas las especies de aves consumieron cantidades similares de orugas y escarabajos, pero el uso de otras presas fue variable. Los Cicadellidae (Homóptera) exóticos (Opsius stactagolus) específicos del tamarisco exótico (Tamarix chinensis) comprendieron una parte sustancial de la dieta de Vermivora luciae (49%), mientras que las hormigas representaron el 82% de la dieta de Icteria virens. La dieta de Dendroica petechia incluyó un 45% de dípteros acuáticos de la familia Cecidomyiidae. Todas las especies de aves consumieron el cicadellide exótico específico del tamarisco. La comparación de las dietas de aves con la disponibilidad de presas de artrópodos de origen acuático y terrestre mostró que los insectos terrestres comprendieron el 91% de todas las dietas de aves, comparado con un 9% de presas de origen acuático. Se registraron cambios estacionales en los artrópodos de la dieta de tres especies de aves, aunque no se detectaron cambios estacionales en los artrópodos muestreados en la vegetación, indicando que al menos tres especies de aves no estuvieron seleccionando las presas en proporción a su abundancia. Todas las especies de aves presentaron mayor superposición de presas con los artrópodos colectados en la zona de vegetación nativa de mesquite (Prosopis) y Acacia, la cual contuvo mayor diversidad de artrópodos y presas de mejor calidad (i.e., Lepidoptera). V. luciae y D. petechia consumieron altas proporciones de presas encontradas en mayor abundancia en la zona de vegetación dominada por el tamarisco, que ha sido establecida desde la construcción de la Presa Glen Canyon. Estas especies parecieron exhibir plasticidad ecológica en respuesta a un incremento antropogénico en las presas como recuso alimenticio.

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