Tufted Puffin (Fratercula cirrhata) Science Article 2 abstract In spite of their putative importance in the evolution of certain traits (e.g., nocturnality, coloniality, cliff nesting), the effects of aerial predators on behaviorof adult seabirds at colonies have been poorly investigated. We hypothesized that Tufted Puffins (Fratercula cirrhata) respond to danger posed by aerial predators by […]
Food intake rates and habitat segregation of Tufted Duck Aythya fuligula and Scaup Aythya marila exploiting Zebra Mussels Dreissena polymorpha.
Tufted Duck (Aythya fuligula) Science Article 1 abstract The foraging skills of Tufted Duck Aythya fuligula and Scaup Aythya marila feeding on Zebra Mussels Dreissena polymorpha were studied in experiments under semi-natural diving conditions with relevance to the IJsselmeer/Markermeer area (large lakes in the centre of The Netherlands, former Zuiderzee area), the major freshwater wintering […]
DIVING BEHAVIOUR AND HEART RATE IN TUFTED DUCKS (AYTHYA FULIGULA)
Tufted Duck (Aythya fuligula) Science Article 2 abstract Diving behaviour and heart rate were monitored in tufted ducks diving under circumstances which simulated various environmental conditions such as feeding under ice in winter R. STEPHENSON et al., J. exp. Biol. 126, 341-359 (1986) Download article download full text (pdf)
New records concerning range and altitudinal distribution ofTropical Mockingbird Mimus gilvus in Ecuador
Tropical Mockingbird (Mimus gilvus) Science Article 4 abstract Se reportan dos nuevas localidades para el Sinsonte Colilargo Mimus gilvus en Ecuador. Junto aestos registros la especie es conocida por cuatro observaciones en el pais, todas ubicadas en losAndes del norte de Ecuador. Se sugiere que Mimus gilvus puede estar extendiendo su rango dedistribucion desde Colombia, […]
THE NESTING OF SOME VENEZUELAN BIRDS
Tropical Mockingbird (Mimus gilvus) Science Article 3 abstract I passed the interval from 15 March to 24 July 1966 at ‘La Araguata,’ a large cattle farmsituated among the hills near Pirapira, some 20 miles south of Valencia in the state ofCarabobo, Venezuela. Although most of my time was devoted to the study of the RufousfrontedThornbird […]
Bigamy in a Male Mockingbird
Tropical Mockingbird (Mimus gilvus) Science Article 1 abstract Like many passerine species, the Mockingbird (Mimus polyglottos) is thought to be highly monogamous. Laskey (1935, Auk 52: 370), for example, reports perennial pair bonding between identified males and females, even though the female may leave for the fall and return to the same male during the […]
TIME AND ENERGY BUDGETS OF THE MOCKINGBIRD (MIMUS POLYGLOTTOS) DURING THE BREEDING SEASON
Tropical Mockingbird (Mimus gilvus) Science Article 2 abstract A time and energy budget of male and female Mockingbirds (Mimus polyglottos) in six phases of their breeding cycle was completed using the equivalent temperature model to predict perching metabolic rates. Recorded time-budget behaviors included perching, bipedal locomotion, flight, and the time spent in the sun and […]
Observations on the nesting and incubation behavior of the Tropical Gnatcatcher (Polioptila plumbea)
Tropical Gnatcatcher (Polioptila plumbea) Science Article 1 abstract OBSERVATIONS ON INCUBATION AND NESTING BEHAVIOR OF THE TROPICAL GNATCATCHER (POLIOPTILA PLUMBEA) IN EASTERN ECUADOR Erin C. Hannelly & Harold F. Greeney, Ornitologia Neotropical 15: 539-542 Download article download full text (pdf)
CAUSES AND CONSEQUENCES OF TREE SWALLOW(TACHYCINETA BICOLOR) DISPERSAL IN SASKATCHEWAN
Tree Swallow (Tachycineta bicolor) Science Article 12 abstract Poor breeding success often increases dispersal, but there is conflicting evidenceabout the putative adaptive benefi ts of dispersal behavior. Thus, observational and experimentaldata were analyzed to test whether breeding success (number of young fl edging) infl uencedbreeding and natal dispersal by Tree Swallows (Tachycineta bicolor), using information […]
Age-related differences in plumage characteristics of male treeswallows Tachycineta bicolor: hue and brightness signal differentaspects of individual quality
Tree Swallow (Tachycineta bicolor) Science Article 11 abstract Age-related differences in plumage characteristics of birds can be the result of differential survival of more ornamented individuals, within-individual changes in plumage attributes with age, or a combination of both. In this study, we investigated age-class related differences in plumage attributes of male tree swallows Tachycineta bicolor […]