During scientific research in the northern Pantanal between the 20th of December 2012 and the 10th of January 2013 I often observe Solitary Sandpipers along the muddy ditches on a farm. Of the two subspecies of the solitary sandpiper recognized the subspecies present probably was Tringa solitaria solitaria which usually has a more well-defined streak between the eye and the bill which are clearly visible on the images shot. On the other hand Tringa solitaria cinnamomea typically lacks these streaks, being more finely spotted and speckled instead. First I saw the Solitary Sandpiper (Tringa solitaria) on the muddy fringes of small pools, where you could see them from wooden bridges crossing these waters. There were no more but 3 individuals which you could see at one time. In between 10 days the water level rose by about half a meter. After that you only saw Solitary Sandpipers on muddy pieces of grassland between leaves of grass. These patches were characterized by highly degraded grassland, where cattle used to feed on quite recently.
Der Prärieläufer (Bartramia longicauda) wird ja nur gelegentlich in der Westpläarktis beobachtet worden. Wenn es richtig recherchiert ist, strandet diese Limikole am ehesten auf Inseln im Atlantik, wie auf St. Mary’s auf den Scilly-Inseln oder zuletzt Mitte September 2013 auf Fair Isle, was zu den Shetland-Inseln gehört. Es gibt auch eine Meldung von der baskischen Küste von der Estaca de Bares, in Galizien. Vielleicht kommt er auch mal nach Deutschland. So ganz auszuschließen ist das nicht und er ist einfach ein super Vogel. Der Vogelbeobachter, der den Prärieläufer aber mal ohne langes Warten auf diesen Alert sehen möchte, sei ein Trip nach North Carolina empfohlen. Und zwar im Spätsommer/ Herbst. Jedes Jahr machen sich nämlich im Spätsommer Millionen von Vögel auf um entlang alter Routen von der Arktik, der Prärie oder den nördlichen Küsten nach Süden zu gelangen. Die Überwinterungsorte können vom Süden der Vereinigten Staaten, über Mittelamerika, bis zu den südlichen Ausläufern Südamerikas reichen. Einer der wandernden Limikolen ist der Prärieläufer (Bartramia longicauda) im englischen Upland Sandpiper genannt. Aber auch der bekannte Continue reading Prärieläufer (Bartramia longicauda) an der Ostküste der USA→
Every evening a very special spectacle occurs in this beautiful Wildlife Refuge in the south of New Mexico. Sandhill cranes (Grus canadensis) arrive at the “crane pools” at the Bosque del Apache National Wildlife Refuge each evening. Having spent the day feeding in nearby corn fields, they will overnight standing in the shallow pools of the Reserve. This presumably so that they can rest in the dark with minimal threat to be attacked by coyotes. As the sun rises the next morning, they eventually depart to the corn fields again. The pond which the Cranes prefer, is perhaps my favorite spot in the whole area of the Bosque del Apache NWR. I spend the first days in January 1999 in the Bosque Del Apache NWR after a business trip to Texas. My main targets were Snow Goose (Chen caerulescens), Hooded Merganser (Lophodytes cucullatus), Bald Eagle (Haliaeetus leucocephalus), Greater Yellowlegs (Tringa melanoleuca), Lesser Yellowlegs (Tringa flavipes), Continue reading Sandhill Cranes in Bosque Del Apache NWR at Sunset→
Early morning, 5:30 am. Haze over the water and I am watching through my camouflage tent here on the edge of Laguna Alalay on 2,600 m (asl). Waders are my main interest. At 4:30 am I got up already. The starry sky promised a nice day. In fact, at 5:00 am I pitched my tent in the dark. I pitched it on a site at the Laguna, which I had chosen yesterday. Great Continue reading Pectoral Sandpiper (Calidris melanotos) on Laguna Alalay – Bolivia→
Whereas long-distance bird migration for aquatic bird species is roughly understood there are other movements of birds between especially the lower Paraná River valley wetlands in Argentina, and the south Brazil/Pantanal wetlands which are far from clear.
Besides the fact, that the global patterns of Summer/ Winter north and south of the equator determines the arrival and departure of arctic migrants and Patagonian guests, there are two major inherent factors which drive birds moving in and out the Pantanal. The one is the regular change in flooding and dryness or even droughts. The other factor is the different food mix embedded in that pattern of seasonal flooding. Whereas most birds move in with the floods in September/ October others move in when the floods retreat using food resources e.g. on small pools left after the waters has covered the most part of the Pantanal.
A good example are the Jabirus, Jabiru mycteria, big storks, which are not present in the Pantanal during the flooding season. Obviously they move to higher grounds to sites outside the Pantanal area. Availability of food for the adult individuals to raise their young are the driving factor. The birds prefer low water levels, especially in lagoons and ponds, in order to obtain the food they can catch with their specialized beaks. Besides by watching for preys while walking they also hunt by tactile prey location, thanks to the sensible bill tip. The Jabiru feeds on various aquatic preys such as fish, molluscs, crustaceans, amphibians, snakes, even young caimans and insects. They walk slowly in shallow water, regularly stabbing and pecking at preys with the bill. One of their fish species preferred are mussum fish (Symbranchus marmoratus), which can stay dormant and encapsulated in the mud throughout the dry season. They are reactivated by the humidity of the rain and start to swim again when the water rises in the rainy season. The Jabiru is a specialist in detecting and catching the dormant fish in the muddy ground of the dried ponds.
Another example of birds using the environmental conditions during the dry season are huge concentrations in nesting sites in the gallery forest, to take advantage of the seasonal resources available. The breeding colonies are formed by hundreds of nesting birds, such as Wood stork (Mycteria americana), egrets (Snowy Egret, Egretta thula, Great White Egret, Casmerodius albus and the Capped Heron, Pilherodius pileatus) and the Roseate Spoonbill, Ajaia ajaja. In this galleryyou will find some more examples of bird moving in the Pantanal or adjacent Southern Brazil or migrate to these wetlands.