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2007

Conservation of biodiversity and ecosystem services at Altos de Chicauma, central Chile

  • L. Urbina, G. Martinez

  • 2007

In the past 50 years, humans have dramatically altered the natural landscape, causing the irreversible loss of biodiversity worldwide. This has been true for the densely population central region of Chile, which has been declared one of the 25 global biodiversity conservation hotspots. The El Roble region in central Chile has been designated by the federal government as a priority… Read Project SummaryConservation of biodiversity and ecosystem services at Altos de Chicauma, central Chile

Interactions between top predators and the coastal net fishery based in Mar del Plata, Buenos Aires Province, Argentina

Nets used in fishing operations worldwide are known to kill a variety of non-target organisms, including non-commercial fishes, seabirds, marine mammals and sea turtles worldwide. Argentine coastal waters are intensively used as a foraging area by a large number of marine top predators and also attract a large and diverse fishing fleet, resulting in documented seabird bycatch. Although there is… Read Project SummaryInteractions between top predators and the coastal net fishery based in Mar del Plata, Buenos Aires Province, Argentina

Assessing the importance of natural and human factors affecting the distribution of the lesser rhea and upland goose

The lesser rhea (Pterocnemia pennata pennata) is distributed across wide expanses of Argentina’s sparsely populated regions. However, their populations have been in decline with hypothesized causes including environmental factors such as food competition with greater rheas and livestock, as well as direct human impacts such as hunting and egg poaching. The upland goose (Chloephaga picta) inhabits similar regions but feeds… Read Project SummaryAssessing the importance of natural and human factors affecting the distribution of the lesser rhea and upland goose

The role of waterbird communities in the Pampas lagoons of Buenos Aires, Argentina: A study of their structure, impact and seasonality

The Pampas region of Argentina is dominated by shallow lagoons that may be either temporary or permanent and have complex ecological patterns driven by very local conditions. Birds are one of the most conspicuous fauna in these aquatic environments, and as a group they serve as both indicators of lagoon conditions and major players in lagoon nutrient cycling. Researchers proposed to study the structure and seasonality of waterbird assemblages in three lagoons with different limnological characteristics, and to characterize habitat use by these waterbird communities in reproductive colonies and roosting sites. In addition, they intended to estimate the seasonal contribution of waterbirds to the nitrogen, phosphorus and organic material profiles in the lagoons. As with many regions worldwide, the Pampas are becoming fragmented by human development while also being recognized for their intrinsic, tourism and recreational values. Knowledge of waterbird assemblages, diversity, habitat use, and role in nutrient cycles is essential to developing and updating conservation and management plans for habitats with resident and migratory species.Read Project SummaryThe role of waterbird communities in the Pampas lagoons of Buenos Aires, Argentina: A study of their structure, impact and seasonality

Migration patterns and population connectivity of the Black Skimmer in South America: a continental approach

  • R. Mariano-Jelicich

  • 2007

The South American subspecies of Black Skimmer, Rynchops niger intercedens, is an important neotropical bird, widely distributed from Venezuela to the southeastern coast of Argentina. Population information for this subspecies is scarce and restricted to local distribution sites, making their conservation status difficult to determine. In Argentina, anecdotal information on breeding grounds suggest small colonies of R. niger intercedens next to rivers, contrasting with the high numbers registered on non-breeding grounds on the southeastern coast of Argentina (up to 10,000 non-breeders in Mar Chiquita Coastal Lagoon). This observed contrast in bird abundances raises the question of the existence of a non-breeding mixture of birds from breeding colonies distributed throughout the main South American hydrological basins. In this study researchers analyzed the genetic differences between skimmers’ populations from Brazil and Argentina, sampling individuals at breeding sites in Brazil and Argentina, and the large non-breeding site at Mar Chiquita (Argentina). Read Project SummaryMigration patterns and population connectivity of the Black Skimmer in South America: a continental approach

Protection of white-tailed tropicbirds and Audubon’s shearwaters in the Bahamas: Addressing the effects of rats, avian predators, and lack of nest sites

Cavity nesting seabirds in the Bahamas and other tropical archipelagos have declined sharply since humans arrived. Although biologists have attempted to find and protect the remaining populations, even on uninhabited and formally protected islands scientists have recently documented large declines in local populations of Audubon’s shearwaters (Puffinus lherminieri lherminieri) and white-tailed tropicbirds (Phaethon lepturus catesbyii). Halting the declines of these… Read Project SummaryProtection of white-tailed tropicbirds and Audubon’s shearwaters in the Bahamas: Addressing the effects of rats, avian predators, and lack of nest sites

Pelagic ecology of diving seabirds: Determination of their movements and behavior by means of high resolution remote sensing devices

The Patagonian shelf constitutes and important reproductive and foraging habitat for several seabird species. Imperial cormorants (Phalacrocorax atriceps) are important top predators of the Patagonian Shelf ecosystem and face significant threats such as the incidental mortality in fishing nets and other operational interactions. Many of the solutions to these problems require accurate knowledge of their behavior and at-sea distribution. Research… Read Project SummaryPelagic ecology of diving seabirds: Determination of their movements and behavior by means of high resolution remote sensing devices