First records of Calidris canutus Linnaeus , 1758 ( Charadriiformes , Scolopacidae ) and Trogon surrucura Vieillot , 1817 ( Trogoniformes , Trogonidae ) for Entre Ríos province ( Argentina ) , and noteworthy reports of other birds in protected areas

We recorded 2 new bird species in Entre Ríos province, Argentina: Calidris canutus (Linnaeus, 1758) and Trogon surrucura Vieillot, 1817. In addition, we present 25 noteworthy records for bird species in El Palmar National Park, Pre Delta National Park, and other parts of the province.


Introduction
In Entre Ríos province, Argentina, the advance of the agricultural frontier and increasing urbanization have left few remaining natural habitats, with varying degrees of modification (Brown et al. 2006).Protected areas (PAs) play an important role in maintaining regional biodiversity (Arzamendia and Giraudo 2004).In this context, it is important to establish PAs using scientific criteria based on gradients in species richness, ecosystem representativeness, areas of endemism, and biodiversity hotspots (Richardson andWhittaker 2010, Arzamendia andGiraudo 2012).Several works have been published on the birds of Entre Ríos (e.g.Freiberg 1943, Beltzer 1980, Salvador et al. 1985, Abadie 1988, 1993, Camperi 1992, De la Peña 1996, 1997, 2012, Beltzer et al. 2006).Additionally, lists of bird species have been published for the 2 national parks (NP) in the province: Pre Delta NP (Alonso 2008) and El Palmar NP (Marateo et al. 2009).These inventories, however, were made with limited territorial and methodological planning, as is the case for most of the Neotropical region (Bini et al. 2006).As a result, inventories of bird species in Entre Ríos and PAs within the province are still incomplete.Consequently, taxonomic and biogeographic studies continue to present changes in the composition and distribution of the avifauna of Entre Ríos (e.g.Areta et al. 2004, Bodrati and Sierra 2008, Aves Argentinas 2009, Alvarado and La Grotteria 2011, Passafaro 2012, Fernández Guaraz 2013, Cantador 2014, Reales et al. 2015).In fact, the total number of bird species present in the province is not yet known.Decisions on biodiversity conservation must be made considering the distribution of species (Brooks et al. 2006).Therefore, as part of a continuous effort and in the framework of a project that aims to assess the effectiveness of PAs for bird conservation, we present records of 2 new bird species for Entre Ríos province and noteworthy records of other birds, mainly in PAs.

Methods
The Entre Ríos province has an area of 78.781 km 2 and its extreme points are: -30.1547, -58.6539 to the north; -34.041944, -58.6367 to the south; -31.9928, -60.7225 to the east, and -30.9331, -57.8086 to the west (Fig. 1; datum WGS84).It is limited to the north by the Guayquiraró River, the Basualdo Creek, the Mocoretá River, and the Las Tunas Stream, to the south and west by the Paraná River, and to the east by the Uruguay River (Beltzer et al. 2006).Entre Ríos encompasses 3 biogeographical provinces: Paranaense (dominated by subtropical forest and riparian forest), Espinal (savannas, grasslands, temperate dry forests, and shrublands) and Pampean (mostly grasslands) (Cabrera 1976).
Data was recorded at different times and locations in the last 25 years (from 1991 to 2015) and collected in the national parks and gap areas as part of a project to define priority areas for the conservation of birds in Entre Ríos (Table 1).The goal was to produce an inventory of the avifauna of the province, focusing on threatened and poorly known birds.We reviewed the data from different lists (Freiberg 1943, Beltzer 1980, Salvador et al. 1985, Abadie 1988, 1993, Camperi 1992, De la Peña 1996, 1997, 2012, Beltzer et al. 2006, Alonso 2008, Marateo et al. 2009) to determine which species were not recorded previously in PAs.The taxonomy and nomenclature of the birds in the study follows the classification of the South American Checklist Committee (Remsen et al. 2017).
Identification.Birds were recorded visually or aurally, with the assistance of binoculars, tape recorders, and cameras (whenever possible).We identified species using field guides and taxonomic keys (Olrog 1959(Olrog , 1968,   (Marino et al. 2013).

Trogonidae
Trogon surrucura Vieillot, 1817 The male of this species can be distinguished by its metallic blue hood and breast, black cheeks and throat, and dark green back, while the rest of the underparts are red and the undertail is white (Figs 7-8) (Narosky and Yzurieta 2010).This latter character was observed, but it is not distinguishable in the photographs.The most similar species in Argentina is T. currucui (Linnaeus, 1766), but it is found only in the Yungas region (northern Argentina, in the provinces of Tucumán, Salta, and Jujuy) and in eastern in Formosa province (Olrog 1979, Narosky andYzurieta 2010).In addition, T. currucui presents black and white barring in the outer rectrices and the undertail (Olrog 1968(Olrog , 1979)).
The new record of Trogon surrucura significantly increases the distribution range of this species.This species inhabits the central and southern parts of Brazil (states of Rio de Janeiro, Minas Gerais, Goiás, São Paulo, Mato Grosso do Sul, Paraná, Santa Catarina, and Rio Grande do Sul), and eastern Paraguay, while in Argentina it is present in Misiones, northern Corrientes, eastern Formosa and Chaco, and northern Santa Fe.This observation represents the southernmost record of this species, 390 km south of its previously known distribution in Argentina (Ramsar Site Jaaukanigás, Reconquista, Santa Fe) (Giraudo et al. 2008) and 650 km southwest from Cerro Largo, Uruguay (Claramunt and Cuello 2013).
Calidris canutus breeds in the Arctic region of North America and Asia and spends the non-breeding period in more southern latitudes of the Northern Hemisphere and in the Southern Hemisphere.Calidris canutus is found almost exclusively in marine coasts, although there are records in inland water environments (Piersma et al. 1996).For example, C. canutus was recorded in the continental Lagoons of Melincué and El Cristal, in the neighboring province of Santa Fe (Rozzatti and Mosso 1997, Blanco et al. 2001, Romano et al. 2005).This subspecies is found in southern South America (C.canutus rufa) migrates long distances, from the arctic tundra to Tierra del Fuego, making a few stops on its journey south (Piersma et al. 1996).It can be found on the marine coasts of southern South America during the nonbreeding period (especially in Las Lomas Bay and San Sebastián, in Tierra del Fuego).In the southern autumn, it can also be found on the Uruguayan, Argentinean, and southern Brazilian coasts during its migration to the north (Piersma et al. 1996).
Additionally, we also obtained new records for 25 poorly known species in the Pre Delta NP and El Palmar NP and other locations in the province (Table 1) (Freiberg 1943, De la Peña 1996, 2012, Beltzer et al. 2006, Alonso 2008, Marateo et al. 2009).Seven of these species are categorized as Vulnerable (Charadrius modestus, Spartonoica maluroides, and Sporophila ruficollis), Endangered (Calidris canutus and Sporophila palustris) and Threatened (Sarkidiornis melanotos and Dolichonyx oryzivorus) according to the national list of threatened birds of Argentina (López-Lanús et al. 2008).For Entre Ríos, Freiberg (1943) indicates a total of 301 species and De la Peña (1997) a total of 333, although the latter indicates a total of 261 species 16 years later, considering only his empirical data (De la Peña 2012).On the other hand, Beltzer et al. (2006) present a total of 291 species in the province.We remark that the total number of bird species in Entre Ríos is still uncertain.According to the data from 25 years of our own field sampling, literature research with reliable data and the review of 7 museum collections, the total number of bird species that inhabit Entre Ríos province probably surpasses 350 species, including the new data herein.The new records presented in this study are a contribution to the knowledge of the distribution of birds in Entre Ríos.We confirmed the presence of 22 bird species in the national parks, which were not recorded before in any protected area in the province.