Patrick Pereira

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McGill University | McGill

Although Wilson ́s plovers (Charadrius wilsonia) are migratory, a resident population breeds in coastal northeastern Brazil and there population trend is described as decreasing by the IUCN Red List. Domestic dogs are a major predator of Wilson’s plover nests on an island in northeastern Brazil where dogs are kept to guard fishing equipment. Local...

The aim of the present work is to estimate the number of neurons in hipocampal formation of Charadrius semipalmatus, a neartic shorebird of the plover group (Charadriidae family). We used immunohistochemistry with anti NeuN (MAB377) to define the cytoarchitectonic boundaries and obtain the stereological estimate of the number of neurons and volume...

The aim of the present work is to describe the hipocampal formation of Charadrius semipalmatus, a neartic shorebird of the plover group (Charadriidae family). Using cresyl violet (Nissl technique) we defined the cytoarchitectonic boundaries and obtained the stereological estimate of the number of neurons, glial cells, total cells and the hipocampal...

The presence of dogs on Islands that have birds nesting causes very intense impact over the ground nesting birds community. In this video we recorded one dog eating several nests in only five minutes.

The semipalmated sandpiper Calidris pusilla and the spotted sandpiper Actitis macularia are long and short distance migrants, respectively. C. pusilla breeds in the sub-arctic and mid-arctic tundra of Canada and Alaska and winters on the north and east coasts of South America. A. macularia breeds in a broad distribution across most of North America...

Studies on fish viroses primarily focus on pathogens affecting symptomatic hosts. However, advances in metagenomic sequencing have revealed a much greater viral diversity in fish than previously thought. Viruses once considered exclusive to mammals have been found in bony fish, such as coronaviruses in salmon and hepadnaviruses in fish and amphibia...

This study investigated the effects of physical exercise on the hematology of tambaqui (Colossoma macropomum), a species of economic importance in aquaculture due to its rapid growth and adaptability. Fish from two environments were analyzed: one with exercise stimulation and another without. Blood samples were collected via intracardiac puncture a...

This study investigated the presence of hepaciviruses, including the hepatitis C virus (HCV), in the transcriptome of the Spotted Sandpiper (Actitis macularius), a migratory bird. The research was conducted on Otelina Island, in the Amazon estuary of Bragança-PA, using mist nets to capture the birds. After collection, the animals were anesthetized...

Animal migration is crucial for species survival and has significant public health implications due to the potential spread of zoonotic pathogens. Migratory birds like the Semipalmated Sandpiper (Calidris pusilla), which travel from Canada to South America, can facilitate the transcontinental dispersal of viruses. Studying viral metagenomes through...

Understanding zoonotic virus transmission is crucial for preventing future pandemics. Migratory birds like Actitis macularius serve as viral reservoirs, facilitating the spread of zoonotic pathogens. This study analyzed the bird's virome using next-generation sequencing (NGS), identifying 11 viral particles linked to human infections. Among these w...

This study investigated the virome of Carollia perspicillata, a bat species from the Phyllostomidae family found in the Bragança region. Using metagenomic techniques, various viruses were identified, including bacteriophages and an endogenous retrovirus. During collection, the bats were captured using mist nets, anesthetized, and perfused with sali...

Wild birds that migrate long distances can act as vectors for microorganisms, facilitating mutations and potential disease outbreaks. Actitis macularius, a migratory bird from the Bragantina region, travels from its Canadian breeding grounds to tropical regions due to food scarcity and low temperatures. Monitoring viral diversity in such species is...

The Tambaqui is one of the most representative Amazon fish species, being highly exploited in fisheries, aquaculture and as a research model. Nonetheless, data about functional genome are still required to evaluate reproductive and nutrition parameters as well as resistance to pathogens. The of next-generation sequencing has allows assessing the tr...

Normally, the host immunological response to viral infection is coordinated to restore homeostasis and protect the individual from possible tissue damage. The two major approaches are adopted by the host to deal with the pathogen: resistance or tolerance. The nature of the responses often differs between species and between individuals of the same...

Migrant birds prepare differently to fly north for breeding in the spring and for the flight to lower latitudes during autumn, avoiding the cold and food shortages of the Northern Hemisphere’s harsh winter. The molecular events associated with these fundamental stages in the life history of migrants include the differential gene expression in diffe...

Migrant birds prepare differently to fly north for breeding in spring, and for the flight to lower latitudes during autumn avoiding the cold and food shortages of the north hemisphere's harsh winter. The molecular events associated with these two fundamental stages in the life history of migrants include the differential expression of regulatory ge...

Background Migrant birds prepare differently to fly north for breeding in spring and for the flight to lower latitudes during autumn avoiding the cold and food shortages of the north hemisphere's harsh winter. The molecular events associated with these fundamental stages in the life history of migrants include the differential gene expression in di...

Migrant birds prepare differently to fly north for breeding in spring and for the flight to lower latitudes during autumn avoiding the cold and food shortages of the north hemisphere’s harsh winter. The molecular events associated with these fundamental stages in the life history of migrants include the differential gene expression in different tis...

For the epic journey of autumn migration, long-distance migratory birds use innate and learned information and follow strict schedules imposed by genetic and epigenetic mechanisms, the details of which remain largely unknown. In addition, bird migration requires integrated action of different multisensory systems for learning and memory, and the hi...

Background For the epic journey of autumn migration, long-distance migratory birds use innate and learned information and follow strict schedules imposed by genetic and epigenetic mechanisms, the details of which remain largely unknown. In addition, bird migration requires integrated action of different multisensory systems for learning and memory,...

The number of parvalbumin neurons can be modified by social, multisensory, and cognitive stimuli in both mammals and birds, but nothing is known about their plasticity in long-distance migratory shorebirds. Here, in the spotted sandpiper (Actitis macularius), we investigated the plasticity of parvalbumin neurons of two brain areas during this speci...

Microglial immunosurveillance of the brain parenchyma to detect local perturbations in homeostasis, in all species, results in the adoption of a spectrum of morphological changes that reflect functional adaptations. Here, we review the contribution of these changes in microglia morphology in distantly related species, in homeostatic and non-homeost...

Abstract Based on previous evidence that environmental enrichment is associated with telencephalic cellular proliferation and that stable visuotopic tectal circuits are essential for discrimination of placement and identity of stationary or moving objects in the visual field, differential plasticity is expected in these areas. Here we tested this...

Fish use spatial cognition based on allocentric cues to navigate, but little is known about how environmental enrichment (EE) affects learning and memory in correlation with hematological changes or gene expression in the fish brain. Here we investigated these questions in Colossoma macropomum (Teleostei). Fish were housed for 192 days in either EE...

Semipalmated sandpiper (Calidris pusilla) migration to the southern hemisphere includes a 5‐day non‐stop flight over the Atlantic Ocean, whereas semipalmated plover (Charadrius semipalmatus) migration, to the same area, is largely over land, with stopovers for feeding and rest. We compared the number and 3‐D morphology of hippocampal astrocytes of...

Little is known about environmental influences on radial glia-like (RGL) α cells (radial astrocytes) and their relation to neurogenesis. Because radial glia is involved in adult neurogenesis and astrogenesis, we investigated this association in two migratory shorebird species that complete their autumnal migration using contrasting strategies. Befo...

Carassius auratus is a teleost fish that has been largely used in behavioral studies. However, little is known about potential environmental influences on its performance of learning and memory tasks. Here, we investigated this question in C. auratus, and searched for potential correlation between exercise and visuospatial enrichment with the total...

Seasonal migratory birds return to the same breeding and wintering grounds year after year, and migratory long-distance shorebirds are good examples of this. These tasks require learning and long-term spatial memory abilities that are integrated into a navigational system for repeatedly locating breeding, wintering, and stopover sites. Previous inv...

Excel file shows all data related to astrocytes morphometric features with MMI > 0.55 and correspondent frequency distribution histograms for each morphometric variable. Because hierarchical cluster analysis was based on morphometric variables with multimodality index higher than 0.55, it is expected to find multimodal or at least bimodal distribut...

Stereological parameters for the GFAP positive neurons in the right hippocampal formation of C. pusilla. ∑Q- = equals the total number of objects of interest counted using the optical dissector, SSF = section sampling fraction, ASF = area sampling fraction, TSF = thickness sampling fraction, a(frame) = area of counting frame, A(x,y step) = grid siz...

Stereological parameters for the GFAP positive neurons in the left hippocampal formation of Calidris pusilla. ∑Q- = equals the total number of objects of interest counted using the optical dissector, SSF = section sampling fraction, ASF = area sampling fraction, LHF = left hippocampal formation.

Stereological parameters for the GFAP positive neurons in the right hippocampal formation of C. pusilla. ∑Q- = equals the total number of objects of interest counted using the optical dissector, SSF = section sampling fraction, ASF = area sampling fraction, TSF = thickness sampling fraction, a(frame) = area of counting frame, A(x,y step) = grid siz...

Stereological parameters for the GFAP positive neurons in the left hippocampal formation of C. pusilla. ∑Q- = equals the total number of objects of interest counted using the optical dissector, SSF = section sampling fraction, ASF = area sampling fraction, TSF = thickness sampling fraction, a(frame) = area of counting frame, A(x,y step) = grid size...

The analysis of large numbers of sequences requires the reduction of ambiguities during the analytical work to ensure that the effort will focus only on confirmed sequences. Performing this work automatically may help to minimize potential errors associated with tedious manual correction, allowing more effective results. Basic local alignment searc...

The analysis of large numbers of sequences requires the reduction of ambiguities during the analytical work to ensure that the effort will focus only on confirmed sequences. Performing this work automatically may help to minimize potential errors associated with tedious manual correction, allowing more effective results. Basic local alignment searc...

Long distance migratory birds find their way by sensing and integrating information from a large number of cues in their environment. These cues are essential to navigate over thousands of kilometers and reach the same breeding, stopover, and wintering sites every year. The semipalmated sandpiper (Calidris pusilla) is a long-distance migrant that b...

Supporting information. Tables A to G. (DOCX)

ARRIVE guidelines. ARRIVE guidelines form. (PDF)

The species Charadrius semipalmatus and Charadrius collaris are from the Plovers group (Charadriidae Family). These species are migratory and non-migratory birds, respectively. In the migratory birds, the hippocampus is important to recover memories related to the stopping places, details about the breeding and the wintering grounds. The hippocampu...

The aim of this paper is to quantify hippocampal formation neurogenesis of the spotted sandpiper (Actitis macularia) through stereological analyses during winter period. The immature neurons of hippocampal formation were immunolabelled by Anti-Doublecortin (C-18): SC-8066. The specimens were collected on Ilha de Canelas, Brazil (44°44'37.39"N e 66°...

Abstract. Although Wilson ́s plovers (Charadrius wilsonia) are migratory, a resident population breeds in coastal northeastern Brazil and there population trend is described as decreasing by the IUCN Red List. Domestic dogs are a major predator of Wilson’s plover nests on an island in northeastern Brazil where dogs are kept to guard fishing equipme...

The hippocampus is involved in spatial memory in birds and mammals and hence may be important in shorebirds for recalling landmarks and migratory routes. Studies about hippocampal changes induced by migration in sandpipers overwintering in tropical coastal regions are virtually nonexistent. The coastal regions of South America are relevant stopover...