scholarly journals Cambios temporales de la avifauna acuática en el sitio Ramsar “Presa de Valsequillo”, Puebla, México

2017 ◽  
Vol 18 (2) ◽  
Author(s):  
Atenea Berumen Solórzano ◽  
María Rosa Maimone Celorio ◽  
Jorge Agustín Villordo Galván ◽  
Carlos I. Olivera Ávila ◽  
José Antonio González Oreja
Keyword(s):  
Fulica Americana ◽  
Anas Clypeata ◽  
Oxyura Jamaicensis

La Convención de Ramsar busca promover la conservación y el uso sostenible de los humedales de importancia internacional y sus recursos biológicos. En 2012, la Presa de Valsequillo (Puebla, México) fue aceptada como sitio Ramsar, pero se desconocen aún aspectos de la ecología de su avifauna. Con este estudio se incrementó el conocimiento sobre la importancia ornitológica de este sitio Ramsar en el que evaluamos la variación temporal de la estructura de la comunidad de aves acuáticas. Primero, desde febrero de 2014 a enero de 2015, estimamos mensualmente la riqueza y abundancia de aves acuáticas de la Presa desde una embarcación con motor fuera borda, y se usó esta información para analizar los cambios en la riqueza y la diversidad. Después, mediante técnicas de análisis multivariante, obtuvimos grupos de meses con base en su similitud y comprobamos su significación estadística. Finalmente, identificamos las especies responsables de tales cambios. En total, observamos 30 especies de aves acuáticas, pero la riqueza mensual (estandarizada a 768 individuos) varió entre 12 y 20. En ‘primavera-verano’, la comunidad de aves acuáticas fue más sencilla (i.e., con menores valores de abundancia, riqueza y diversidad) que en ‘otoño-invierno’. Los principales cambios en la estructura de la comunidad se debieron a variaciones en la abundancia de unas pocas especies: la gallareta americana (Fulica americana), el pato cucharón (Anas clypeata) y el pato tepalcate (Oxyura jamaicensis). Sin excluir otras posibilidades para estos cambios, nuestro estudio sugiere que los patos (Anatidae) utilizan principalmente la Presa de Valsequillo como un sitio de invernada, mientras que las garzas (Ardeidae) la utilizan como una escala en sus movimientos migratorios otoñales. Nuestros datos pueden aplicarse en programas de ecoturismo (observación de aves), buscando las fechas que permitan maximizar el número de especies observadas, su diversidad o su abundancia.

American Coot (Fulica americana) and Hawaiian Coot (Fulica alai)

2002 ◽  
Author(s):  
I. Lehr Brisbin ◽  
H. Douglas Pratt ◽  
Thomas B. Mowbray
Keyword(s):  
Fulica Americana ◽  
American Coot

scholarly journals Catatropis pakistanensis n. sp. (Trematoda: Notocotylidae) from Northern shovelers, Anas clypeata (Anatidae: Aves) from Pakistan with some remarks on the history of Catatropis species

2012 ◽  
Vol 49 (1) ◽  
pp. 43-48 ◽  
Author(s):  
R. Schuster ◽  
G. Wibbelt
Keyword(s):  
Electron Microscopy ◽  
Histological Evaluation ◽  
Thin Sections ◽  
Genital Opening ◽  
Morphological Studies ◽  
Anas Clypeata ◽  
History Of ◽  
Free Ranging ◽  
A New Species ◽  
Scanning Electron

AbstractFive out of 15 free-ranging Northern shovelers (Anas clypeata Linneus) caught in Pakistan were infected with notocotylid trematodes. Out of the 31 flukes, 10 specimens were used morphological studies, 4 others were also examined by scanning electron microscopy and one remaining trematode was cut in serial semi-thin sections for histological evaluation in order to describe a new species. Like all species of this genus, Catatropis pakistanensis n. sp has a median ridge starting posterior to the basis of the cirrus sac and extends posterior to the ovary. Bilateral to this ridge there are two rows of 9–10 ventral papillae each. Metraterm and cirrus sac are equally in length. In contrast to most other Catatropis spp. the genital opening in C. pakistanensis is situated between the oral sucker and bifurcation of the caeca.

Detection and Molecular Identification of Sarcocystis rileyi (Apicomplexa: Sarcocystidae) From a Northern Shoveler (Anas clypeata) in Mexico

2016 ◽  
Vol 52 (4) ◽  
pp. 931-935
Author(s):  
Patricia Padilla-Aguilar ◽  
Evangelina Romero-Callejas ◽  
David Osorio-Sarabia ◽  
José Ramírez-Lezama ◽  
Nohemi Cigarroa-Toledo ◽  
...  
Keyword(s):  
Molecular Identification ◽  
Anas Clypeata ◽  
Sarcocystis Rileyi

Effect of Weekly Hunting Frequency on Rate of Ducks Harvested

2014 ◽  
Vol 6 (1) ◽  
pp. 247-254
Author(s):  
Elizabeth A. St. James ◽  
Michael L. Schummer ◽  
Richard M. Kaminski ◽  
Edward J. Penny ◽  
L. Wesley Burger
Keyword(s):  
North America ◽  
Wildlife Management ◽  
Anas Platyrhynchos ◽  
Public Lands ◽  
Anas Crecca ◽  
Waterfowl Hunting ◽  
Anas Clypeata ◽  
Hunting Frequency ◽  
Wildlife Management Areas ◽  
The Relationship

Abstract Waterfowl hunting is important culturally and economically in North America. Few studies have evaluated the relationship between weekly hunting frequency and rate of ducks harvested. We evaluated the effect of hunting 2 or 4 d/wk on rate of ducks harvested on three Mississippi Wildlife Management Areas, USA, during three waterfowl hunting seasons, December–January 2008–2011. Harvest of all ducks combined, mallard Anas platyrhynchos, northern shoveler Anas clypeata, or green-winged teal Anas crecca per hunter day did not differ between areas hunted 2 or 4 d/wk, but increased with hours spent afield. We suggest Wildlife Management Areas may be hunted 4 d/wk without reducing duck harvest per hunter day. We recommend continued evaluations of weekly hunting frequency on rate of ducks harvested to sustain science-guided management of waterfowl hunting on Mississippi public lands and elsewhere.

scholarly journals Nutrient Reserves and Clutch-Size Regulation of Northern Shovelers in Alaska

The Auk ◽  
2000 ◽  
Vol 117 (4) ◽  
pp. 971-979 ◽  
Author(s):  
Margaret C. MacCluskie ◽  
James S. Sedinger
Keyword(s):  
Clutch Size ◽  
Egg Production ◽  
Prairie Pothole Region ◽  
Prairie Pothole ◽  
High Productivity ◽  
Brood Rearing ◽  
Nutrient Reserve ◽  
Anas Clypeata ◽  
Nutrient Reserves ◽  
Nest Initiation

Abstract We determined patterns of nutrient-reserve use by female Northern Shovelers (Anas clypeata) nesting at Minto Flats, Alaska, and compared them with those of female shovelers nesting in the Prairie Pothole Region of Manitoba, Canada. Individual variation in somatic lipid was best explained by nest initiation date; females that initiated nests early had larger lipid reserves than females that delayed nest initiation. These results contrast with those from Manitoba, which showed that females used lipid reserves and stored protein during egg production. Incubating females from Alaska did not use protein or mineral reserves, but lipid reserves decreased significantly throughout incubation. Females in Alaska and Manitoba used lipid reserves similarly during incubation. We conclude that endogenous nutrient availability does not proximately limit clutch size during laying for this population of shovelers, possibly due to the high productivity of wetlands in interior Alaska and/or the long photoperiod that allow females to forage extensively. Successful completion of incubation or brood rearing may be an ultimate factor that controls clutch size for this population of shovelers.

Avian schistosomes in French aquatic birds: a molecular approach

2009 ◽  
Vol 83 (2) ◽  
pp. 181-189 ◽  
Author(s):  
D. Jouet ◽  
H. Ferté ◽  
C. Hologne ◽  
M.L. Kaltenbach ◽  
J. Depaquit
Keyword(s):  
First Record ◽  
Aquatic Birds ◽  
Anser Anser ◽  
Anas Crecca ◽  
Cygnus Olor ◽  
Natural Hosts ◽  
Anas Clypeata ◽  
Grus Grus ◽  
Second Internal Transcribed Spacer ◽  
The Impact

AbstractThe prevalence of human cercarial dermatitis (HCD) caused by bird schistosomes appears to be increasing in France, in light of the impact of tourism combined with high densities of wild aquatic hosts in freshwater areas. The present work expands our knowledge of schistosome systematics by including samples of bird schistosomes collected from their natural hosts in France. Heads (318) and viscera (81) of aquatic birds belonging to 16 species from five orders, collecting during the hunting seasons or found dead, were autopsied for nasal and visceral schistosomes. Eggs and/or adults were analysed by molecular methods using the D2 domain and the second internal transcribed spacer (ITS-2) region of rDNA to determine species. Even if nasal eggs were polymorphic according to the host, all haplotypes were similar to that of Trichobilharzia regenti. Marked diversity of visceral species was observed. Final hosts under natural conditions were reported. For the first time, Trichobilharzia franki is reported in its natural bird hosts, Anas platyrhynchos, Anas crecca, Aythya fuligula and Cygnus olor. We also identified T. szidati in A. crecca and Anas clypeata. Bilharziella polonica was found in six species of aquatic birds, including Grus grus. This finding is the first record of bird schistosomes in this aquatic bird. Three new taxa of visceral schistosomes in Anser anser are strongly suspected according to their haplotypes. Futhermore, a new haplotype of visceral schistosomes isolated in Cygnus olor and similar to Allobilharzia visceralis was identified.

scholarly journals A flyway perspective of foraging activity in Eurasian Green-winged Teal, Anas crecca crecca

2007 ◽  
Vol 85 (1) ◽  
pp. 81-91 ◽  
Author(s):  
C. Arzel ◽  
J. Elmberg ◽  
M. Guillemain
Keyword(s):  
Early Spring ◽  
Breeding Strategy ◽  
Foraging Activity ◽  
Long Distance ◽  
Time Activity ◽  
Anas Crecca ◽  
Income Breeding ◽  
Nocturnal Foraging ◽  
Anas Clypeata ◽  
Foraging Time

Time–activity budgets in the family Anatidae are available for the wintering and breeding periods. We present the first flyway-level study of foraging time in a long-distance migrant, the Eurasian Green-winged Teal, Anas crecca crecca L., 1758 (“Teal”). Behavioral data from early and late spring staging, breeding, and molting sites were collected with standardized protocols to explore differences between the sexes, seasons, and diel patterns. Teal foraging activity was compared with that of the Mallard, Anas platyrhynchos L., 1758 and Northern Shoveler, Anas clypeata L., 1758, and the potential effects of duck density and predator-caused disturbance were explored. In early spring, foraging time was moderate (50.5%) and mostly nocturnal (45%). It increased dramatically in all three species at migration stopovers and during molt, mostly because of increased diurnal foraging, while nocturnal foraging remained fairly constant along the flyway. These patterns adhere to the “income breeding” strategy expected for this species. No differences between the sexes were recorded in either species studied. Teal foraging time was positively correlated with density of Teal and all ducks present, but negatively correlated with predator disturbance. Our study suggests that Teal, in addition to being income breeders, may also be considered as income migrants; they find the energy necessary to migrate at staging sites along the flyway.

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