scholarly journals Birds from the endangered Monte, the steppes and coastal biomes of the province of Río Negro, northern Patagonia, Argentina

Check List ◽  
2011 ◽  
Vol 7 (6) ◽  
pp. 782 ◽  
Author(s):  
Fabián A. Llanos ◽  
Mauricio Failla ◽  
Gustavo J. García ◽  
Pablo M. Giovine ◽  
Mirta Carbajal ◽  
...  
Keyword(s):  
Nature Reserve ◽  
San Antonio ◽  
Bird Species ◽  
Habitat Destruction ◽  
Native Vegetation ◽  
Breeding Behavior ◽  
Southern South America ◽  
Northern Patagonia ◽  
Rio Negro ◽  
Period Of Occurrence

The main ecosystem in northern Patagonia, Argentina, is the Monte, a semi-desert scrubland home to a high biodiversity. Monte is the most endangered ecosystem of southern South America, with an annual rate of clearance of the native vegetation estimated at 3.7%. Here we report the results of bird surveys carried out in the province of Río Negro, northern Patagonia. We surveyed four localities mostly dominated by the Monte ecosystem, between 1986 and 2010. Three localities are Important Bird Areas (IBAs): El Cóndor, San Antonio Oeste and Meseta de Somuncurá. The fourth locality is the Paso Córdoba nature reserve. We recorded a total of 263 bird species. The highest species richness was observed at San Antonio Oeste, followed by El Cóndor. Information regarding the period of occurrence and habitats are provided for all species and localities. Additionally, we indicated the cases in which breeding behavior was observed. This information is urgently needed for the evaluation of the consequences of habitat destruction and deterioration as well as for the success of intended remediation measures.

A New Early Danian Gastropod Assemblage From Northern Patagonia, Río Negro Province, Argentina

2012 ◽  
Vol 86 (6) ◽  
pp. 1002-1016 ◽  
Author(s):  
Claudia Julia del Rio
Keyword(s):  
New Species ◽  
New Zealand ◽  
South America ◽  
New Record ◽  
New Genus ◽  
Southern South America ◽  
Northern Patagonia ◽  
Rio Negro ◽  
Endemic Genera ◽  
Eleven Species

A new early Danian gastropod assemblage contained in the Roca Formation of Río Negro Province was analyzed. Eleven species are described and illustrated, the new genus Rocalaria is created, and six new species are recognized: Gyroscala daniana, Heteroterma carmeloi, Microfulgur concheyroae, Sulcobuccinum prominentum, Cidarina lenzaniyeuensis, and Rocalaria alani. The present research includes the first mention of Sulcobuccinum d'Orbigny, 1850, Priscoficus Conrad, 1866, Cavoscala Whitfield, 1892, Microfulgur Finlay and Marwick, 1937, and Cidarina Dall, 1909, for the Danian of Southern South America; the new record of Austrophaera Furque and Camacho, 1949, Fusinus Rafinesque, 1815 and Heteroterma Gabb, 1869 in northern Patagonia; and the oldest Paleogene record for the genus Gyroscala de Boury, 1887. The presence of the study assemblage in northern Patagonia indicates a more complex paleobiogeographic pattern for the area than previously thought, as shown by the record of endemic genera, cosmopolitan taxa, elements with Tethyan/ Indo-Pacific affinities, and genera related with “Wangaloan” faunas of the Paleocene of New Zealand.

scholarly journals The genus Chama Linné (Bivalvia) in the marine Quaternary of northern Patagonia, Argentina

1991 ◽  
Vol 65 (5) ◽  
pp. 756-760 ◽  
Author(s):  
Guido Pastorino
Keyword(s):  
San Antonio ◽  
Water Environment ◽  
First Record ◽  
Warm Water ◽  
Thick Shell ◽  
Northern Patagonia ◽  
Large Size ◽  
Rio Negro ◽  
The Family

Chama iudicai n. sp. is described from the Pleistocene of San Antonio Oeste, Rio Negro Province, Argentina. It is characterized by its large size, thick shell, and crenulated inner margin. Externally it has weak comarginal lamellae. It is indicative of a clear, stenohaline, warm-water environment. This is the first record for the family Chamidae in the Argentine Quaternary.

Taxonomy of Ctenomys (Rodentia: Ctenomyidae) in northwestern Patagonia, Argentina: the occurrence of the “mendocinus” lineage

Mammalia ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mauro N. Tammone ◽  
Ulyses F.J. Pardiñas
Keyword(s):  
South America ◽  
Molecular Data ◽  
Species Level ◽  
Subterranean Rodents ◽  
Mammalian Fauna ◽  
Southern South America ◽  
Monte Desert ◽  
Desert Shrub ◽  
Northern Patagonia ◽  
Northern Portion

Abstract Subterranean rodents Ctenomys are iconic representatives of the mammalian fauna from southern South America. Based on molecular data, eight lineages have been identified within the genus, although species-level identifications and relationships are still debated. Until now, the “magellanicus” clade has been the only lineage mentioned from arid, extra-Andean portions of Patagonia. Here, we report the presence of a Ctenomys population from northern Patagonia that is unambiguously associated with the Central Argentinean “mendocinus” lineage. Most of the 160,000 km2 comprising the northern portion of Patagonia – an area consisting primarily of Monte Desert shrub-land – are inhabited by Ctenomys populations of unknown taxonomy.

scholarly journals An Assessment on Bird’s Diversity in Bagmati River Corridor

1970 ◽  
Vol 2 (1) ◽  
pp. 34-40
Author(s):  
Saroj Thapa ◽  
Shambhu Paudel ◽  
Dipak BK
Keyword(s):  
Public Perception ◽  
Habitat Degradation ◽  
Bird Species ◽  
Habitat Destruction ◽  
Conservation Area ◽  
Point Count ◽  
The Public ◽  
One Year ◽  
Bagmati River ◽  
River Corridor

Bagmati River is considered as a potential conservation area in terms of the bio-diversity conservation due to its unique and diversified habitat distribution. Due to various causes, the river is being polluted and hence habitat degradation rate is increasing. As a consequence, the direct effect is seen on birds inhabiting there. Aiming the assessment of bird's diversity, one year survey was conducted in Bagmati River from Tilganga Bridge to chobhar Gorge Bridge (here after termed as Bagmati river corridor) by applying the point count method .In the total enumeration, 100 of birds species were recorded among which 7 are listed in CITES appendix. The bird species that are regarded as globally threatened are not recorded in the study area. In this report, some potential patches in the study area, are described as hot spots, considering the higher probability of recording maximum number of birds species. The public voice is also collected to find out the public perception on the present status of birds of Bagmati river corridor using the questionaire method. Some causes of habitat destruction and some potential conservation measures are also mentioned. Key Words: Bagmati river corridor, Birds, Conservation, Hotspots, Diversity, Habitat   DOI: 10.3126/init.v2i1.2520 The Initiation Vol.2(1) 2008 pp34-40

scholarly journals Patterns of bryophyte and lichen diversity in bogs and Tepualia stipularis forests of Northern Patagonia (Chile): evidence of a novel ecosystem in southern South America

2016 ◽  
Vol 94 (3) ◽  
pp. 441 ◽  
Author(s):  
Carolina A. León ◽  
Gisela Oliván-Martínez ◽  
Gisela Oliván-Martínez ◽  
Juan Larraín ◽  
Juan Larraín ◽  
...  
Keyword(s):  
South America ◽  
Novel Ecosystem ◽  
Southern South America ◽  
Northern Patagonia ◽  
Lichen Diversity

scholarly journals Evaluación de la actividad de carnívoros en un entierro secundario individual en la Bahía San Antonio, Provincia de Rio Negro

2021 ◽  
Vol 25 (1) ◽  
pp. 5-23
Author(s):  
Rocío Guichón Fernández ◽  
Florencia Borella ◽  
Solana García Guraieb
Keyword(s):  
San Antonio ◽  
Rio Negro

La acción de los carnívoros sobre restos humanos presenta escasos antecedentes en las investigaciones bioarqueológicas patagónicas.  La incidencia de este agente ha sido abordada principalmente en estudios forenses que han generado una robusta metodología aplicable a casos arqueológicos. Se presenta aquí el análisis de un individuo adulto incompleto con modificaciones generada por carnívoros, hallado en el sitio Centro Minero-Criadero de Ostras (costa norte del Golfo San Matías, Río Negro), con cronología del Holoceno tardío final. Se trata de un individuo representado  por 25 elementos, en buen estado de preservación y algunos con notables evidencias del accionar carnívoro. Dadas las características de su disposición, un estudio previo presentó una interpretación preliminar de su formación que sugería que la acción de este agente había actuado sobre el paquete funerario con remanentes de tejido blando. Combinando los modelos forenses y los estudios tafonómicos del tipo y localización del daño provocado por carnívoros, se plantea aquí una interpretación  alternativa que sugiere que el paquete secundario se habría conformado con los remanentes óseos modificados previamente por cánidos. Estos resultados favorecen al conocimiento de la diversidad de prácticas mortuorias en la costa del Golfo San Matías y del accionar  de carnívoros en el registro bioarqueológico en ambientes de dunas litorales.

Additive negative effects of Philornis nest parasitism on small and declining Neotropical bird populations

2018 ◽  
Vol 29 (03) ◽  
pp. 339-360 ◽  
Author(s):  
MARIANA BULGARELLA ◽  
MARTÍN A. QUIROGA ◽  
GEORGE E. HEIMPEL
Keyword(s):  
Bird Species ◽  
Field Studies ◽  
Habitat Destruction ◽  
Biological Information ◽  
Mortality Factor ◽  
Healthy Population ◽  
Small Populations ◽  
Negative Effects ◽  
Nest Parasitism ◽  
Bird Populations

SummaryThe declining-population paradigm holds that small populations are particularly vulnerable to anthropogenic influences such as habitat destruction, pollution and species introductions. While the effects of particular stressors, such as parasitism, may be unimportant in a large, healthy population, they can be serious and even devastating in situations characterised by a restricted geographic range, or by fragmented or reduced population sizes. We apply this idea to nest parasitism of threatened Neotropical bird species that exist in small populations, focusing on dipteran nest parasites in the genusPhilornis. We review the literature onPhilornisparasitism exerting negative pressure on bird populations that have become small and isolated due to human actions and present a new case ofPhilornisparasitism of a threatened hummingbird species. Our aim is to raise awareness about the exacerbating effect that nest parasites can have on small and declining bird populations; especially when biological information is scarce. The five reviewed cases involve two species of Darwin’s Finches in the Galápagos Islands attacked by the invasiveP. downsi, two species of hawks on islands in the Caribbean attacked by the nativeP. piciandP. obscura, and the Yellow CardinalGubernatrix cristatain southern South America attacked by an unknownPhilornisspecies. We also present new documentation of parasitism of a threatened hummingbird species in mainland Ecuador by an unidentifiedPhilornisspecies. We recommend more field studies to determine the presence of nest parasites in bird populations worldwide to improve understanding how nest parasites affect bird fitness and population viability and to allow time to act in advance if needed. Parasitism byPhilornismay represent a severe mortality factor in most already threatened bird species, putting them at greater risk of extinction. Therefore, parasitism management should be included in all threatened species recovery plans.

scholarly journals Diversity, Uses, and Threats in the Ghodaghodi Lake Complex, a Ramsar Site in Western Lowland Nepal

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Pramod Lamsal ◽  
Krishna Prasad Pant ◽  
Lalit Kumar ◽  
Kishor Atreya
Keyword(s):  
Aquatic Macrophytes ◽  
Irrigation System ◽  
Local Level ◽  
Bird Species ◽  
Habitat Destruction ◽  
Population Pressure ◽  
Conservation Strategies ◽  
Seepage Water ◽  
Ramsar Site ◽  
Anthropogenic Threats

This study documents aquatic and terrestrial/riparian biodiversity in an anthropogenically disturbed Ramsar site, the Ghodaghodi Lake complex, in the Western Nepal surveyed during the summer season (March-April) of 2007. The study site comprises three major interconnected lakes: Ghodaghodi (138 ha), Nakharodi (70 ha), and Bainshwa (10 ha). Five transect lines for aquatic macrophytes and three transect lines and 37 sampling plots were laid to sample terrestrial/riparian plants, birds, and animals. Five sample plots were established for fish and aquatic bird. A total of 45 species of aquatic macrophytes, 54 species of terrestrial/riparian vegetation, 19 fish species, 41 bird species, 17 mammals (endangered and vulnerable), and 5 reptiles (critically endangered, vulnerable, and near threatened) were recorded at the lake complex. Local people have used most of the aquatic and terrestrial plants for different purposes while many of the potential medicinal plant species were still untapped. Persistent anthropogenic threats, like excessive harvesting and poaching, habitat destruction—population pressure, forest fragmentation, siltation, fertilizer and pesticide seepage, water pollution, overgrazing, and unmanaged irrigation system found over the lake complex, endangered the existing biodiversity. The suggested remedial measures are further exploration of medicinal potential, prioritization of in situ biodiversity conservation strategies, and implementation of awareness program at local level against anthropogenic threats.

scholarly journals Conservation success for two Bermudan bird species

Oryx ◽  
1984 ◽  
Vol 18 (3) ◽  
pp. 138-143
Author(s):  
Christopher Lever
Keyword(s):  
Bird Species ◽  
Habitat Destruction ◽  
Forthcoming Book ◽  
The World ◽  
Successful Rehabilitation ◽  
Rats And Mice ◽  
Domestic Stock

The plight of indigenous birds on oceanic archipelagoes often makes depressing reading, as the author points out in his forthcoming book, Naturalized Mammals of the World. Habitat destruction by domestic stock and predation by accidentally introduced rats and mice are the major causes. In Bermuda this discouraging trend has been reversed by the successful rehabilitation of two species within the space of a quarter of a century.

Two new species of free-living marine nematodes of the family Oxystominidae Chitwood, 1935 (Enoplida) with a review of the genus Thalassoalaimus de Man, 1893 from the Argentine coast 

Zootaxa ◽  
2017 ◽  
Vol 4250 (4) ◽  
pp. 347
Author(s):  
ANTONELA MARTELLI ◽  
VIRGINIA LO RUSSO ◽  
GABRIELA VILLARES ◽  
CATALINA T. PASTOR DE WARD
Keyword(s):  
New Species ◽  
San Antonio ◽  
Marine Nematodes ◽  
San Jose ◽  
Key To Species ◽  
Free Living ◽  
Rio Negro ◽  
The Family ◽  
Two New Species ◽  
De Man

Two new free-living marine nematodes of the family Oxystominidae are described from San Antonio Bay (Río Negro) and San José Gulf (Chubut). Litinium australis sp. n., is characterized by having a rounded tail, by the first and second crown of cephalic setae with different lengths, gubernaculum with apophysis and by the presence of at least four precloacal papillae; Thalassoalaimus nestori sp. n., is characterized by having a conical tail, cephalic setae equal in length, gubernaculum with rounded and dorso-caudally directed apophysis and two precloacal papillae. An emended diagnosis of the genus Thalassoalaimus and a key to species are given. 

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