+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

The effect of bill structure on seed selection by granivorous birds

, : The effect of bill structure on seed selection by granivorous birds. African Zoology il; 37(1): 67-80

The effect of bill structure on seed preference and handling time in granivorous birds was determined for a long, slender dove bill, a conical finch bill, and a hooked parrot bill using diamond doves (Geopelia cuneata), Java sparrows (Padda oryzivora) and Fisher's lovebirds (Agapornis fischeri). Four seed species were used during trials: white millet (Panicum miliaceum), red manna (P. maximum), canary seed (Phalaris canariensis) and Japanese millet (Echinochloa frumentacea). Diamond doves handled all seed species significantly faster than sparrows and lovebirds, as they swallow seeds whole. Java sparrows and Fischer's lovebirds husked seeds prior to ingestion; lovebirds took significantly longer than Java sparrows in handling all seed species. Seed characteristics, size and shape affected handling time with reference to bill structure. Diamond doves took significantly longer to handle elongate seeds while Java sparrows handled round seeds slowly and Fischer's lovebirds required similar handling times for all seed species. Java sparrows and Fischer's lovebirds selected greater proportions of the same seed species, suggesting that birds which husk seeds prefer similar seed species. Seeds were not selected according to nutritional intake rate. Japanese millet was the preferred seed species of Fischer's lovebirds and Java sparrows, but provided few calories and little protein per unit time. Seed selection was influenced by bill structure, as seeds were selected, amongst others, according to handling time, and handling time was dependent on bill structure.


Other references

O'gower, A.K., 1955: The Influence of the physical Properties of a Water Container Surface upon its Selection by the gravid Females of Aedes scutcllaris scuteUaris (Walker) for Oviposition (Diptera, Culicidae). The larvae of mosquitos of the group of Aedes scutellaris (Wlk.) are always found in small accumulations of water, such as occur in tree holes, coconut shells, empty cans and similar containers, and Penn found that the breeding places of A. scutel...

Kiraly, L.N.; Differding, J.A.; Enomoto, T.Miko.; Sawai, R.S.; Muller, P.J.; Diggs, B.; Tieu, B.H.; Englehart, M.S.; Underwood, S.; Wiesberg, T.T.; Schreiber, M.A., 2006: Resuscitation with normal saline (NS) vs. lactated ringers (LR) modulates hypercoagulability and leads to increased blood loss in an uncontrolled hemorrhagic shock swine model. Background: Lactated ringers (LR) and normal saline (NS) are used interchangeably in many trauma centers. The purpose of this study was to compare the effects of LR and NS on coagulation in an uncontrolled hemorrhagic swine model. We hypothesized...

Ponzetto, A.; Cohen, B.J.; Vandervelde, E.M.; Mortimer, P.P., 1983: Delta agent in Britain. Lancet 2(8359): 1141-1142

Hunt, C.E., 1978: Unmasking the benefits of CDP. Pediatrics 61(2): 323-324

Shibata, K.; Fukuwatari, T., 2013: High d(+)-fructose diet adversely affects testicular weight gain in weaning rats─protection by moderate d(+)-glucose diet. The use of high D(+)-fructose corn syrup has increased over the past several decades in the developed countries, while overweight and obesity rates and the related diseases have risen dramatically. However, we found that feeding a high D(+)-fructo...

Collins C.M.; Collier R.J., 1987: Effects of acidic ph on the conformation and activity of diphtheria toxin. Bonavida, B And R J Collier (Ed ) Ucla (University Of California-Los Angeles) Symposia on Molecular And Cellular Biology New Series, Vol 45 Membrane-Mediated Cytotoxicity; Cetus-Ucla Symposium, Park City, Utah, Usa, March 9-16, 1986 Xxiii+586p Alan R Liss, Inc : New York, New York, Usa Illus 41-52

Parsons, R.J.; Barnes, J.G.; Higley, H.B., 1988: The community health center in a changing health care environment: the price of survival. Health Marketing Quarterly 6(4): 127-135

Joergensen, L.; Vestergaard, L., S.; Turner, L.; Magistrado, P.; Lusingu, J., P.; Lemnge, M.; Theander, T., G.; Jensen, A., T.R., 2007: 3D7-derived Plasmodium falciparum erythrocyte membrane protein 1 is a frequent target of naturally acquired antibodies recognizing protein domains in a particular pattern independent of malaria transmission intensity. Protection against Plasmodium falciparum malaria is largely mediated by IgG against surface Ags such as the erythrocyte membrane protein 1 family (PfEMP1) responsible for antigenic variation and sequestration of infected erythrocytes. PfEMP1 mole...

Malik, R.K.; Baylan, R.S.; Bhan, V.M., 1986: Sensitivity of wheat cultivars to 2,4-D + dicamba. Sixteeen wheat cv. differed in response to 2,4-D + Dicamba at 0.5 + 0.144 kg, resp., or and 1.0 + 0.288 kg/ha post-em., resp., in terms of reduction in ear length, malformation of spikes and reduction in grain yield. The tolerant and susceptible c...

Layton, K.F.; White, J.Bradley.; Cloft, H.J.; Kallmes, D.F.; Manno, E.M., 2006: Expanding the treatment window with mechanical thrombectomy in acute ischemic stroke. Acute ischemic stroke is a common disease associated with high mortality and significant long-term disability. Treatment options for acute ischemic stroke continue to evolve and include pharmaceutical and mechanical therapies. With the recent US F...