Argentina field notes, v1505
Page 379
Image from the Biodiversity Heritage Library. Contributed by Museum of Vertebrate Zoology, University of California, Berkeley. | www.biodiversitylibrary.org
Transcription
JPM Myers 1944 Journal Arraño Chico, Estancia Medeland 35 km S. of Juancho by road, Ptdo. de Madinanga, Provincia de Bs. Aires, Argentina 18 April (front) 3,5(8); Maguari Stork 0,8(8); Speckled teal 4,9(13); Brown hooded gull 0,1(1); Rifeus backed Negrito 5,1(2). Running down totals: White-rump 40,56(96); Hudsonian godwit 5,8(13); Southern lapwing 3,5(8); Charadrius falcklandius 24,35(59); Bonnibyx madeculus 7,12(19); Orcopholus ruficollis 4,0(4); Black- necked Stilt 18,15(31); Maguari Stork 0,3(3); W. faced Ibis 0,1(1); Speckled teal 4,7(11); Y-B. Pintail 3,3(6); Brown-headed gull 2,14(16); Cincloides fuscus 4,0(4); R-backed Negrib 1,0(1); Correboracraftit 0,1(1). By the end of these two samples the weather had taken a form very reminiscent of that typifying November- a strong SW wind with enormous cumulus formation sweeping over the grasslands. It began with a very extensive and high line of cumulus stretching NE-SW, covering the lower 3/4 of the SE horizon. This moved in a NE direction, and looked as if extensive rain were falling out to sea. Thin at about- 10:30 a.m., an E-W line appeared, with broken with us all morning afternoon. It is not a solid cover, cumulus but rather patchy bits of very heavy + rain laden (+loosing) clouds. They pass rapidly overhead, raining hard for 1-2 minutes. Then there is no rain for another 10-15-30 minutes; the wind reached a Beaufort scale 6 by 1400 and has remained there. This changed the distribution of H2O in the Arraño, particularly on N-S stretches: water was pulled to the N end. WR feathers were being blown out when they foraged in a down-wind direction. After finishing the grid sample at close out onto the llamas, and between the S gate and the N gate saw 28 Orcopholus, 2 bufflons, and 9 Bonnibyx, as well as 25 Vanellus, 150 Thinocorus, a large number (about 50-95) Leucosticte, and some Anthus. Then are now Cincloides fuscus foraging on the llamas as well. After re-entering the Arraño at subunit 4, I stopped to read Rp Lg’s USEFUL band # (to check for fading)—it won the appropriate number—and observed Ryl00 for 20 minutes (see sp. accent). Mar Chiquita at the mouth of canal 7, 21 km N. of Mar Chiquita, Ptdo. de Mar Chiquita, Provincia de Bs. Aires, Argentina 19 April Returning from Mar del Plata Lois let me off at the canal road while she went on to Tandil to collect apples. I walked out to the mouth of canal 7, arriving at the lake shore at 17:20. The WR habitat was completely gone—water level has risen over 3', to the point where it is entering into the reedbeds, and at the edge of the reedbeds it is deep enough for Hudsonian godwits—over 3'. The expanse of mud where we observed Histrionicus WR calliornis