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Distribution and Habitat Use by Sheldgeese Populations Wintering in Buenos Aires Province, Argentina

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Distribution and Habitat Use by Sheldgeese Populations Wintering in Buenos Aires Province, Argentina Distribution and habitat use by Sheldgeese populations wintering in Buenos Aires province, Argentina SUSANA I. MARTIN, NELDO TRACANNA and RON SUMMERS Introduction flower Helianthus annuus. Wheat Triticum aestivum is the most important cereal crop The southern part of Buenos Aires province in the area, although a few fields of oats in Argentina (Fig. 1) is one of the main Avena sativa, barley Hordeum vulgare and wintering areas for three species of sheld­ rye Secale cereale are also found. geese (Tadornini), the Lesser Magellan or Managed pastures make up a consider­ Upland Goose Chloëphaga picta, the Ashy­ able proportion of the area. These, as well headed Goose C. poliocephala and the as natural grassland and crop stubbles are Ruddy-headed Goose C. rubidiceps. Most used for grazing cattle and sheep. of the birds arrive in April and depart in The following field types were recognised August (Humphrey et al. 1970; Niello 1966). in the study area: Here the geese feed on the leaves of autumn 1) Ploughed fields. sown cereal and grass pastures, a situation 2) Wheat stubble with a good coverage of that causes concern amongst farmers. As annual rye-grass and reseeded wheat. well as killing the geese, one of the main These fields are often grazed by cattle. methods to deal with this problem is to scare 3) Wheat stubble lightly ploughed in them with aircraft. Collectively the farmers January or February to allow for better hire an aircraft to round up and drive the growth of annual rye-grass and re­ flocks elsewhere (Pergolani da Costa 1958). seeded wheat and used for winter Sometimes the flocks are driven out to sea in grazing. an attempt to drown them. However, as the 4) Wheat fields with plants which have had geese are used to over-sea migration up to 25 days of growth (two or three (Plotnick 1961) it is likely that they regain leaves). land. Thus this solution is only temporarily 5) Wheat fields with plants which have had effective and only serves to transfer the more than 25 days of growth (already problem elsewhere. tillered). No work has been carried out to establish 6) Young pastures, usually of white clover the amount of damage the geese are doing Trifolium repens, alfalfa Medicago or the best method to deal with the sativa and fescue Festuca arundinacea problem. Therefore, as a first step in trying sown between March and May and first to understand and quantify the problem, a grazed lightly in September. comprehensive survey was carried out in 7) Established pastures of more than one Buenos Aires province in winter to describe year old and grazed annually. They are the distribution and numbers of the geese ploughed and re-established approx­ and their habitat use. imately every eight years. One of the species, the Ruddy-headed 8) Winter oats, sown in March and grazed Goose, has become very rare in Argentina between May and August. (Rumboll 1975) and winters only in this 9) Natural grassland with indigenous area. Thus there is a need to determine its vegetation composed mainly of Stipa present status and distribution so that the sp. which has not been used for any species can be protected and to ensure that other purpose other than for grazing. goose control measures are not directed They often occur in low lying salty soils against it. where Disticlis sp. is also abundant. 10) Paddocks of natural vegetation which are lightly ploughed annually or every Study area two years to favour good reseeding of natural grasses, usually used for sheep The study area is composed of low-lying grazing, and cleared of bushes and land divided into large farms where cereal shrubs. crops are grown, as well as maize Zea mays, 11) Maize, sunflower and sorghum stubble. sorghum Sorghum graniferum, and sun­ 55 Wildfowl 37 (1986): 55-62 56 Susana I. Martin, Neldo Tracanna and Ron Summers Methods km (1984) were surveyed throughout the main wintering area during 10 consecutive The survey was carried out between 17 and days. The length of each transect varied 26 July 1983, and 21 and 31 July 1984. Road between 200 and 500 km. The following transects totalling 3787 km (1983) and 3615 information was collected along the transect Sheldgeese wintering in Argentina 57 to a distance of 500 m on either side of the mined by dividing the proportion of birds vehicle: numbers of each species of goose, found on a particular field type by the their location on the transect and the type of proportion of that field type available in the field on which they occurred. Also, the two area. Values over 1 indicate positive colour morphs of the male Upland Geese, selection and values less than 1 indicate barred and white-breasted were recorded. negative selection (Newton & Campbell The proportion of each field type present 1973). along the transect was determined from sample sections totalling 606 km in 1983 (16% of the total surveyed length) and 2089 Results km in 1984 (58%). Plots were similar in size and independent of the use assigned to Numbers and distribution them. Indices of habitat selection were deter­ The total numbers of geese counted were Figure 2. Number and relative abundance of sheldgeese (Buenos Aires, 1983). 58 Susana I. Martin, Neldo Tracanna and Ron Summers 15,600 in 1983 (4.1 geese/km of transect) The distribution of the three types varied; and 16,560 in 1984 (4.5 geese/km of tran­ Ashy-headed and Ruddy-headed Geese sect). Only 12 Ruddy-headed Geese were were more abundant in the east of the study sighted in 1983 and 44 in 1984, most of which area compared with the west (Fig. 2 and 3). occurred south of Tres Arroyos. The rest Circles in Figures 2 and 3 represent geese were Upland Geese (88.0% in 1983 and found within approximately 100 km sections 93.8% in 1984) and Ashy-headed Geese in each transect. Geese were not observed (12% in 1983 and 6.2% in 1984). The in all of these sections for both years. relative proportion of Upland and Ashy­ The population sizes of the two colour headed Geese in the 1984 survey was cal­ morphs of the Upland Goose were different culated for 12,200 of the 16,560 individuals and they had a different distribution; 62.2% censused since the distance to some groups and 60.9% of the males were barred, and did not permit their correct identification. 37.8% and 39.1% white-breasted in 1983 Figure 3. Number and relative abundance of sheldgeese (Buenos Aires, 1984). Sheldgeese wintering in Argentina 59 and 1984 respectively. The barred birds 6.6% and 4.6% of the total counted predominated around the coast whilst the whereas the very few flocks of over 500 white-breasted males were proportionately accounted for 12.2% and 12.3%. Never­ more common in the northern part (Fig. 4). theless, it can be said that a majority of the The different species and two morphs of birds (64.3% and 54.1%) occurred in flocks Upland Goose formed mixed flocks in these of under 250. areas where they occurred together. Flock sizes were variable in size, but never larger Habitat use than 1000 birds (Fig. 5). The most frequent flock size was 1-25 birds though the Most of the geese occurred on stubble numbers they contained only represented fields, newly sown pastures and pastures Carhue iuarez \iC n l. Pringles * îBTornquist San Cayetano ¡Tres Arroyos Bahia Blanca f CnLDorrego' ,/Pedro ( Luro barred morph white-breasted morph ’atogones Figure 4. Distribution of C. picta (barred and white-breasted morphs). 60 Susana I. Martin, Neldo Tracanna and Ron Summers composed of natural vegetation or sheld-geese surveyed was similar for both paddocks. Relatively few occurred on surveys. Upland Geese were widely spread autumn sown wheat (Tables 1 and 2). In throughout all the area surveyed, whereas both years Upland Geese selected wheat both Ashy-headed and Ruddy-headed stubble fields, natural grassland and maize, Geese were found almost exclusively in the sunflower and sorghum stubbles, and Ashy­ main wheat growing area to the east. It was headed Geese selected for newly sown not possible to distinguish differences in pastures and maize, sunflower and sorghum relative abundance of habitats which could stubbles. Ruddyheaded Geese selected for account for this distribution. However, the newly sown pastures in both years and for east is more productive as a result of better wheat fields, natural grasslands or maize, soils and higher rainfall; wheat production is sunflower and sorghum stubbles in either more important in this area and plot sizes one of the surveys. However, these last are on the whole smaller than in the west. indices were derived from the observation Plotnick (1961) had suggested that barred of very few individuals. birds formed almost the entire population in Densities were calculated for a few fields area B (Fig. 4), that white breasted birds of known area, values varying between 1.2 were also present in area A, and area C had and 3.5 geese per ha in wheat fields of less many Ashy-headed and Ruddy-headed than 25 days growth, and between 0.5 and Geese. 3.5 geese per ha in wheat fields of more than The three species remain in Buenos Aires 25 days growth. province from April to August. In winter a large proportion of the habitats available are wheat stubbles, which in some cases are Discussion used for grazing cattle or sheep, or maize, sorghum and sunflower stubbles. Geese The distribution of the three species of selectively used these habitats where they 90 80- 70- 60- 1983 50- 40- 3 0 - 20- 10- 0.
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