Resumo
We review existing data on the distribution of the Least Tern, Sternula antillarum along the Brazilian coast, based on the literature and museum specimens, and present results of a year-long study (October 2008 to September 2009) on the seasonal abundance of this species on a large tidal flat area, Cajuais Bank, in the State of Ceará, north-eastern Brazil. We evaluate whether the observed variation in the abundance of terns is due to the occurrence of an undocumented breeding colony, or alternatively, whether it results from an influx of migrants from the Northern Hemisphere. The recovery of historical data revealed that all literature references on the distribution of birds in the Americas, published up to the late 1990s include Brazil in the non-breeding range of the Least Tern. This inclusion is based on a few, old (late 19th and early 20th centuries) museum specimens, all of which have been collected on the northern and north-eastern coasts of this country'. From the late 1980s, birds continued to be occasionally recorded along the coastline, running from the State of Amapá (01°N) up to the State of Bahia (10°S), with records of single individuals in south-eastern and southern Brazil. An alleged record from Rocas Atoll, 260 km off the Brazilian mainland, might tentatively refer to the Old World Little Tern S. albifrons. At Cajuais Bank, Least Terns occurred from October 2008 to April 2009, and in September 2009. The highest numbers (> 800 individuals) were recorded in January-February (Southern Hemisphere's summer). The species was observed in rather small numbers ( 30) in March-April (early-mid Southern Hemisphere fall) and in September (early Southern Hemisphere spring), being absent from the area in May-August (Southern Hemisphere's fall and winter). In October-December 2008 (Southern Hemisphere's spring), and September 2009 (early Southern Hemisphere's summer), no birds were in breeding plumage. In January, about 32% of the birds were in breeding plumage, while from February-April (Southern Hemisphere's summer to mid fall) all were in breeding plumage. This pattern is consistent with what would be expected for migratory birds. The Cajuais Bank itself (and adjacent beaches and inland environments) holds the largest numbers of Least Terns recorded in Brazil, thus being one of the most significant sites along the migratory route of the species.
Resumo
We review existing data on the distribution of the Least Tern, Sternula antillarum along the Brazilian coast, based on the literature and museum specimens, and present results of a year-long study (October 2008 to September 2009) on the seasonal abundance of this species on a large tidal flat area, Cajuais Bank, in the State of Ceará, north-eastern Brazil. We evaluate whether the observed variation in the abundance of terns is due to the occurrence of an undocumented breeding colony, or alternatively, whether it results from an influx of migrants from the Northern Hemisphere. The recovery of historical data revealed that all literature references on the distribution of birds in the Americas, published up to the late 1990s include Brazil in the non-breeding range of the Least Tern. This inclusion is based on a few, old (late 19th and early 20th centuries) museum specimens, all of which have been collected on the northern and north-eastern coasts of this country'. From the late 1980s, birds continued to be occasionally recorded along the coastline, running from the State of Amapá (01°N) up to the State of Bahia (10°S), with records of single individuals in south-eastern and southern Brazil. An alleged record from Rocas Atoll, 260 km off the Brazilian mainland, might tentatively refer to the Old World Little Tern S. albifrons. At Cajuais Bank, Least Terns occurred from October 2008 to April 2009, and in September 2009. The highest numbers (> 800 individuals) were recorded in January-February (Southern Hemisphere's summer). The species was observed in rather small numbers (< 30) in March-April (early-mid Southern Hemisphere fall) and in September (early Southern Hemisphere spring), being absent from the area in May-August (Southern Hemisphere's fall and winter). In October-December 2008 (Southern Hemisphere's spring), and September 2009 (early Southern Hemisphere's summer), no birds were in breeding plumage. In January, about 32% of the birds were in breeding plumage, while from February-April (Southern Hemisphere's summer to mid fall) all were in breeding plumage. This pattern is consistent with what would be expected for migratory birds. The Cajuais Bank itself (and adjacent beaches and inland environments) holds the largest numbers of Least Terns recorded in Brazil, thus being one of the most significant sites along the migratory route of the species.
Assuntos
Animais , Distribuição Animal , Migração Animal , Aves/classificação , Ecossistema/análiseResumo
We review existing data on the distribution of the Least Tern, Sternula antillarum along the Brazilian coast, based on the literature and museum specimens, and present results of a year-long study (October 2008 to September 2009) on the seasonal abundance of this species on a large tidal flat area, Cajuais Bank, in the State of Ceará, north-eastern Brazil. We evaluate whether the observed variation in the abundance of terns is due to the occurrence of an undocumented breeding colony, or alternatively, whether it results from an influx of migrants from the Northern Hemisphere. The recovery of historical data revealed that all literature references on the distribution of birds in the Americas, published up to the late 1990s include Brazil in the non-breeding range of the Least Tern. This inclusion is based on a few, old (late 19th and early 20th centuries) museum specimens, all of which have been collected on the northern and north-eastern coasts of this country'. From the late 1980s, birds continued to be occasionally recorded along the coastline, running from the State of Amapá (01°N) up to the State of Bahia (10°S), with records of single individuals in south-eastern and southern Brazil. An alleged record from Rocas Atoll, 260 km off the Brazilian mainland, might tentatively refer to the Old World Little Tern S. albifrons. At Cajuais Bank, Least Terns occurred from October 2008 to April 2009, and in September 2009. The highest numbers (> 800 individuals) were recorded in January-February (Southern Hemisphere's summer). The species was observed in rather small numbers (< 30) in March-April (early-mid Southern Hemisphere fall) and in September (early Southern Hemisphere spring), being absent from the area in May-August (Southern Hemisphere's fall and winter). In October-December 2008 (Southern Hemisphere's spring), and September 2009 (early Southern Hemisphere's summer), no birds were in breeding plumage. In January, about 32% of the birds were in breeding plumage, while from February-April (Southern Hemisphere's summer to mid fall) all were in breeding plumage. This pattern is consistent with what would be expected for migratory birds. The Cajuais Bank itself (and adjacent beaches and inland environments) holds the largest numbers of Least Terns recorded in Brazil, thus being one of the most significant sites along the migratory route of the species.(AU)
Assuntos
Animais , Distribuição Animal , Migração Animal , Aves/classificação , Ecossistema/análiseResumo
Background: Cuterebrosis is a furuncular myiasis caused by a dipterous from the genus Cuterebra. These flies are highly species-specific in relation to their hosts, being mostly common to rodents, lagomorphs and marsupials, with the development of a large subcutaneous furuncle as the main clinical manifestation. The most important microscopic alterations are the invasion of the damaged area by neutrophils, lymphocytes, macrophages, eosinophils and mast cells and the proliferation of fibroblasts and endothelial cells. However, the Cuterebrosis can occur in domestic animals, causing the formation of an atypical parasitic cycle, with the development of significant and severe clinical signs due to the erroneous migration of larvae, a situation not observed in typical hosts. Neuritis has been verified in cats due to the migration triggered by the larvae, causing irreversible damage to the central nervous system. In Brazil no reports of cases of myiasis in dogs and cats have been reported for any species of Neotropical Cuterebra. One of the species most commonly found in studies parasitizing mammals in the Midwest is Cuterebra apicalis. However, this Diptera has only been found parasitizing marsupials Didelphidae rodents and rodent Cricetidae. This study notifies the first case of furuncular obligatory myiasis in a dog in Central Brazil, in the Federal District, caused by Cuterebra apicalis. Case: In November 2009, an adult female Poodle dog (eight years old), was received from an urban area of the Federal District (Vicente Pires), an area close to large remnants of Cerrado stricto sensu. The dog was treated at a private veterinary clinic in Brasilia. The animal presented a furuncular myiasis in the lumbar region. Larvae were detected at the lesion site, which was collected for clinical veterinary analysis and sent for identification, on a 20 mL container with a third of its volume filled with vermiculite to safeguard the integrity of the material. [...]
Assuntos
Animais , Cães , Especificidade de Hospedeiro/fisiologia , Miíase/veterinária , Ectoparasitoses/veterináriaResumo
Background: Cuterebrosis is a furuncular myiasis caused by a dipterous from the genus Cuterebra. These flies are highly species-specific in relation to their hosts, being mostly common to rodents, lagomorphs and marsupials, with the development of a large subcutaneous furuncle as the main clinical manifestation. The most important microscopic alterations are the invasion of the damaged area by neutrophils, lymphocytes, macrophages, eosinophils and mast cells and the proliferation of fibroblasts and endothelial cells. However, the Cuterebrosis can occur in domestic animals, causing the formation of an atypical parasitic cycle, with the development of significant and severe clinical signs due to the erroneous migration of larvae, a situation not observed in typical hosts. Neuritis has been verified in cats due to the migration triggered by the larvae, causing irreversible damage to the central nervous system. In Brazil no reports of cases of myiasis in dogs and cats have been reported for any species of Neotropical Cuterebra. One of the species most commonly found in studies parasitizing mammals in the Midwest is Cuterebra apicalis. However, this Diptera has only been found parasitizing marsupials Didelphidae rodents and rodent Cricetidae. This study notifies the first case of furuncular obligatory myiasis in a dog in Central Brazil, in the Federal District, caused by Cuterebra apicalis. Case: In November 2009, an adult female Poodle dog (eight years old), was received from an urban area of the Federal District (Vicente Pires), an area close to large remnants of Cerrado stricto sensu. The dog was treated at a private veterinary clinic in Brasilia. The animal presented a furuncular myiasis in the lumbar region. Larvae were detected at the lesion site, which was collected for clinical veterinary analysis and sent for identification, on a 20 mL container with a third of its volume filled with vermiculite to safeguard the integrity of the material. [...](AU)