Robert Clay

• Manomet

Population abundance and trend estimates are crucial to science, management, and conservation. Shorebirds, which are abundant in many coastal habitats and play important roles in coastal ecosystems, are facing some of the most dramatic population declines of any group of birds globally. However, accurate and up-to-date population estimates are lack...

Addressing urgent conservation issues, like the drastic declines of North American migratory birds, requires creative, evidence-based, efficient, and collaborative approaches. Over 50% of monitored North American shorebird populations have lost over 50% of their abundance since 1980. To address these declines, we developed a partnership of scientis...

La Revista del Museo de La Plata es editada por la Facultad de Ciencias Naturales y Museo de la Universidad Nacional de La Plata. Tiene por objetivo principal servir de vehículo de transmisión del conocimiento a la comunidad científica y académica que realiza su labor de investigación en el ámbito de las Ciencias Naturales. Desde su aparición en 18...

Maxent species distribution models (SDMs) for rare, migratory taxa can be hindered by methodological and analytical issues. To overcome these problems, we developed an analytical framework to build SDMs for key stages of the annual lifecycle of the Marsh Seedeater and the Black-bellied Seedeater, two Neotropical grassland bird species of conservati...

Final reports of projects Canopy 1992 and Yacutinga 1995

Final Report of Project Canopy 1992

Final report of Project Aguará Ñu 1997-1998

The first Paraguayan records of the Broad-win-ged Hawk Buteo platypterus are reported from Itapúa and Central departments.

Félix de Azara described five species of “Alondra” in his seminal work on birds of Paraguay in 1805. Two of these are pipits Anthus: No. 146 Alondra Chií and No. 147 Alondra Correndera. Vieillot (1818) then formally described the two based entirely on Azaraʼs descriptions, respectively Anthus chii and Anthus correndera. The former has long been con...

Many shorebirds (Order: Charadriiformes; Family: Charadriidae, Recurvirostridae, Scolopacidae, Haematopodidae, Jacanidae) are highly migratory, traversing thousands of kilometers between high latitude breeding and low latitude nonbreeding sites. In doing so, they are dependent on networks of coastal and interior wetland ecosystems. To aid in the ef...

A região de fronteira entre Brasil e Paraguai, no estado de Mato Grosso do Sul, encontra-se no centro de um dos Corredores Bioceânicos propostos e contempla áreas naturais de Chaco e Pantanal com exuberante biodiversidade. O ecoturismo tem na biodiversidade sua principal fonte de insumos, onde se destaca o turismo de observação de aves. Além de con...

Resumen.-El Corbatita amarillo Sporophila nigricollis se conocía en Paraguay de sólo tres reportes, todos ellos no documentados con evidencia física. En esta contribución presentamos información de los registros nacionales y la primera documentación fotográfica de la especie en Paraguay. Se considera a la especie como divagante en el país, probable...

We provide information on all birds known to date at Ypet Private Nature Reserve and Estancia Golondrina. We reviewed all ornithological records from 1997 to 2017, totaling 348 bird species for the area. Habitat preferences and relative abundance for each species are detailed. The avifauna of Ypet is composed of 58 Atlantic Forest endemics. At leas...

Paraguayan records of the recently described Ibera Seedeater Sporophila iberaensis are compiled and reviewed. Observations of birds identifiable to this species in Paraguay date from at least 1998, with the first photographic documentation in December 2004. The species has now been recorded at a minimum of 11 localities in the departments of Cordil...

Previously unpublished new and noteworthy Paraguayan reports of Anatidae, Ardeidae, Podicipedidae and Rallidae are provided. The first documented records of Speckled Teal Anas flavirostris, Yellow-billed Pintail Anas georgica, Blue-winged Teal Anas discors and Red-gartered Coot Fulica armillata are detailed with a review of previous undocumented re...

ABSTRACT: The Lari of Paraguay are poorly known and only three species in two families occur regularly (Large-billed Tern Phaetusa simplex, Yellow-billed Tern Sternula superciliaris and Black Skimmer Rynchops niger). However, recent field studies have revealed that diversity is much greater than previously thought, and several new species have been...

Semipalmated Sandpiper (Calidris pusilla) populations have undergone significant declines at core nonbreeding sites in northeastern South America. Breeding populations have also declined in the eastern North American Arctic, but appear to be stable or increasing in the central and western Arctic. To identify vulnerable populations and sites, we doc...

The Numeniini is a tribe of 13 wader species (Scolopacidae, Charadriiformes) of which seven are Near Threatened or globally threatened, including two Critically Endangered. To help inform conservation management and policy responses, we present the results of an expert assessment of the threats that members of this taxonomic group face across migra...

Galbula ruficauda es una especie que cuenta con pocos registros a lo largo de 20 años en Paraguay. La especie ha sido observada en la zona norte del Chaco y Pantanal paraguayo, departamento Alto Paraguay. En este trabajo reportamos los registros y localidades de ocurrencia de la especie en el país. Actualmente se encuentra en la categoría de Datos...

The Southern Pochard Netta erythrophthalma occurs in southern and eastern Africa, and in northern and eastern South America. It is widespread and common in Africa, where the population of the subspecies Netta e. brunnea is estimated at 30,000-70,000 individuals. Distribution of the nominate subspecies Netta e. erythrophthalma in South America is mo...

New Paraguayan departmental records are provided for six herptile species, five reptiles Apostolepis assimilis, Erythrolam-prus jaegeri, Lygophis meridionalis, Philo-dryas agassizii and Pseudoeryx plicatilis (Dipsadidae); and one amphibian: Lepto-dactylus labyrinthicus (Leptodactylidae).

The doraditos (Pseudocolopteryx spp.) are a little-known group of small, yellow-breasted tyrants, distributed mainly in southern South America. All five species occur in Paraguay, including Pseudocolopteryx citreola, here documented in the country for the first time. The distribution and habitat preferences of the species in Paraguay are clarified,...

The doraditos (Pseudocolopteryx spp.) are a little-known group of small, yellow-breasted tyrants, distributed mainly in southern South America. All five species occur in Paraguay, including Pseudocolopteryx citreola, here documented in the country for the first time. The distribution and habitat preferences of the species in Paraguay are clarified,...

We provide the first description of the nest site, eggs, and chick of the globally threatened White-winged Nightjar Eleothreptus candicans, based on observations in Aguara Ñu, Mbaracayú Forest Nature Reserve, Paraguay, made during November-December 1997. Two eggs were laid directly on the ground at the edge of a small clearing in campo-sujo grassla...

Protected areas (PAs) are a cornerstone of conservation efforts and now cover nearly 13% of the world's land surface, with the world's governments committed to expand this to 17%. However, as biodiversity continues to decline, the effectiveness of PAs in reducing the extinction risk of species remains largely untested. We analyzed PA coverage and t...

Coverage of IBAs and AZEs by PAs and by internationally designated sites, and site-scale conservation under climate change. (DOC)

Red List Index of species survival for species triggering IBAs of which over 50% are completely protected, compared with those for which≤50% are completely protected. Shading indicates the 95% confidence intervals based on uncertainty around the estimated value that is introduced by Data Deficient species. (TIF)

Observed annual percentage declines in Red List Index (RLI) are significantly different from those expected by chance based on 10,000 randomisations for (A) bird species (during 1988–2008) with>50% of IBAs completely protected (N = 1,004, P<0.001), and (B) for bird (1988–2008), mammal (1996–2008) and amphibian species (1980–2004) restricted to sing...

Completely protected IBAs (n = 737) are significantly less threatened than partially/unprotected IBAs (n = 1,263; chi-squared test: χ2 = 19.0, df = 3, P <0.001), but almost half (47%) face ‘high’ or ‘very high’ threats. (TIF)

Annual percentage decline in Red List Index for bird species (during 1988–2008) with different proportions of IBAs completely protected. Numbers within each bar refer to the number of species. Error bars show 95% confidence intervals based on uncertainty around the estimated value that is introduced by Data Deficient species. (TIF)

List of countries excluded from the analysis of PA coverage of IBAs owing to incomplete data on IBAs and/or their PA coverage. (DOCX)

Trends in mean % area protected for IBAs in different (A) habitats and (B) regions. Shading shows 95% confidence intervals based on uncertainty around date of protection (and, for a small subset of IBAs, proportion protected). (TIF)

PA coverage (% area) for IBAs in different ecosystems, habitats, regions, and relevant to different Multilateral Environmental Agreements. (DOCX)

Costs of IBA management. (DOCX)

Aim We aimed to complete the first systematic assessment of extinction risk based on projected population declines derived from spatially explicit habitat projections for any taxonomic group at a regional scale, to use the outputs to ascertain the efficacy of an existing protected area network in covering species of conservation concern, and identi...

El Chogüí Oliváceo (Thraupis palmarum) es una especie de amplia distribución y muy adaptable, asociada con hábitats abiertos o semi-abiertos con palmeras, incluyendo áreas urbanas (Isler & Isler 1999). Cuatro subespecies son reconocidas: atripennis desde el este de Nicaragua hasta el norte de Colombia y el extremo noroeste de Venezue-la, violilavat...

Coordinadores Nacionales de los Censos: Adrián Azpiroz y Gustavo Marino (Argentina), Rafael Antunes Dias (Brasil), Cristina Morales (Paraguay) y Joaquín Aldabe y Pablo Rocca (Uruguay). Participaron en las tareas de campo:: Las secciones introductorias de este informe (pp. 2-9) fueron tomadas y adaptadas de la versión anterior (2009) elaboradas por...

Comprehensive assessments of Paraguay's forest cover (FC) change from the 1970s to the 2000s using Landsat observations were conducted, including a wall-to-wall mapping of changes across the whole country between the 1990s and 2000s, and an assessment of forest area in the Atlantic Forest ecoregion in the 1970s using a systematic sampling approach....

Lek-mating Long-tailed Manakins (Chiroxiphia linearis) exhibit an unusual pattern of delayed plumage maturation. Each year, males progress through a series of predefinitive plumages before attaining definitive plumage in their fifth calendar year. Females also exhibit variation in plumage coloration, with some females displaying male-like plumage c...

Summary of the content of a compilation country by country of all IBAs existing in the Americas

We provide new information on all birds known from San Rafael National Park, Paraguay. Ornithological records from the period 1997 to 2006 have been reviewed, adding 112 new species to the reserve's avifauna. We provide data on the presence of 405 species in seven basic habitats types, and on their relative abundance. Biogeographically, San Rafael...

Habitat loss remains the major threat to birds in the Neotropics, although there are several additional specific threats, for example trade, nest parasitism, invasives on islands, and for seabirds, bycatch. Capacity building also remains a key issue for conservation in the area. Nevertheless, the region has benefited by a surge in research, with an...

Vinaceous Amazons (Amazona vinacea) are endemic to the Atlantic forest of southeastern Brazil, eastern Paraguay, and the province of Misiones in Argentina. We searched for Vinaceous Amazons throughout the western part of its range in Argentina and Paraguay during 1639 days of fieldwork from 1997 to 2006. These parrots have disappeared from most are...

Using Landsat images acquired since early 1970s, we have mapped the forest cover and change between 1989 and 2000, and estimated forest area in 1973 in Paraguay's Atlantic Forest Ecoregion (PAFE). The results revealed that as of 1973, 73.4% of the PAFE region was covered by forest. Since then, the proportion of forested area was quickly reduced to...

Lek-mating Long-tailed Manakins (Chiroxiphia linearis) exhibit an unusual pattern of delayed plumage maturation. Each year, males progress through a series of predefinitive plumages before attaining definitive plumage in their fifth calendar year. Females also exhibit variation in plumage coloration, with some females displaying male-like plumage c...

During the last 30 years, Paraguay underwent massive changes in the forest cover. Changes include the removal of the majority of the interior Atlantic Forest, an ecosystem with the highest levels of recorded biodiversity. This study quantified three decades of forest cover (FC) change in Paraguay using Landsat data. To assess FC change between the...

First Page of the Article

Recebido em 12 de setembro de 2003; aceito em 29 de outubro de 2004 Ararajuba 12 (2):153-155 Dezembro de 2004 The grasslands of central South America, and in particular the Cerrado, have recently been recognised as one of the highest conservation priorities in the Neotropics (Dinerstein et al. 1995, Wege and Long 1995, Collar 1996, Stotz et al. 199...

A Dunlin (Calidris alpina) in full breeding plumage was discovered at Laguna Ganso in the Paraguayan Chaco on 29 June 2001. This bird represents the first record of the species for the country and for the interior of South America. Although primarily a species of higher northern latitudes, there are a number of previous records from coastal South A...

Resumen. – Avifauna chaqueña del norte de Paraguay. – Inventarios llevaros a acabo en cinco sitios en el chaco del norte de Paraguay indicaron la presencia de 233 especies de aves, incluyendo a Mosqueta Boreal (Empidonax alnorum), la cual se registra por primera vez en el país. Se documentaron por primera vez tres especies por medio de especimenes...

Se conocen pocos detalles sobre la reproducción de i, de amplia distribución en el Neotrópico. Presentamos el primer reporte de nidificación de esta especie en Paraguay. Entre el 12 y el 17 de diciembre de 2001 realizamos observaciones esporádicas en un nido hallado en la Isla Ybycu’i, Departamento Itapúa, Paraguay. El nido consistía en una platafo...

— In western Panama, an unusual hybrid zone exists between white-collared manakins, Manacus candei, and golden-collared manakins, M. vitellinus. Unidirectional introgression of plumage traits from vitellinus into candei has created a region in which all definitively plumaged males have a collar that is lemon-colored. These males are nearly indistin...

In 1995, we discovered a population of the poorly known and critically endangered White-winged Nightjar (Caprimulgus candicans) in Yata'i (Butia paraguayensis) palm cerrado at the Mbaracayú Forest Nature Reserve, Paraguay. We provide the first description of the dislay of C. candicans, as observed in December 1995. The display, which appears to fun...

Paraguay is naturally divided into the Oriente and the Chaco by the río Paraguay. Hayes (1995) has further divided Paraguay into seven "geographical regions", primarily based on major vegetation units and geographical features. We provide important new records for Paraguay, the Oriente and the Chaco, and first records of species in the Alto Chaco,...

Emberizoides ypiranganus se encuentra incorrectamente descripto e ilustrado en las guías de campo disponibles. Como resultado, esta especie casi-amenazada habitante de bañados y pastizales puede ser pasada por alto, siendo de hecho, menos rara de lo que generalmente se piensa. Aún observándola posada y de lejos, o en vuelo, E. ypiranganus es notabl...

El primer nido conocido de Platyrinchus leucoryphus fue encontrado en la Estancia Parabel, Parque Nacional San Rafael, Paraguay el 4 noviembre 1996. Estaba situado a 2,45 m en la prominente horqueta de un renoval solitario en una selva relativamente alta (dosel de 25 m) en terreno llano. Casi no existía vegetación terrestre pero había una pronuncia...

El Bosque Atlántico del sudeste de Brasil, este de Paraguay y noreste de Argentina, se ha considerado como una de las regiones más amenazadas del Neotrópico, con un elevado número de aves endémicas y con problemas de conservación a nivel global. En Paraguay resta menos del 13% de la superficie boscosa original de este tipo de ambiente; la última op...