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A Comparative Analysis of the Nutritional Quality of Mixed and Exclusive Fruit Diets for Yellow-Vented Bulbuls

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A Comparative Analysis of the Nutritional Quality of Mixed and Exclusive Fruit Diets for Yellow-Vented Bulbuls The Condor 94:912-923 0 The Cooper Ornithological Society 1992 A COMPARATIVE ANALYSIS OF THE NUTRITIONAL QUALITY OF MIXED AND EXCLUSIVE FRUIT DIETS FOR YELLOW-VENTED BULBULS IDO IZHAKI Department of Biology, Universityof Halfa at Oranim, Tivon, 36910, Israel Abstract.Yellow-vented Bulbuls (Pycnonotusxanthopygos) were fed a mixed diet of four fruit species(Rhamnus alaternus,Lonicera etrusca,Rubia tenuifolia, Ephedra aphylla) and diets containing each of these four fruits separately. A mixed-fruit diet proved no more nutritious than a single-fruit diet, and all the birds lost weight at the same rate regardless of diet. Birds fed a mixed-fruit diet assimilated less protein than those fed exclusively on Rubia and Rhamnus fruits, and assimilated more energy than those fed exclusively on Ephedrafruits. The apparent metabolizable energy(AME) in bulbuls fed a mixed diet (0.73) was higher than in those fed on Rubia and Ephedra (0.69 and 0.61, respectively)but lower than in those fed on Rhamnus (0.82). Protein content alone does not explain loss of body mass. However, lack of specificamino acids, or high potassiumto sodium ratios, may cause mass loss. In addition, a mixed diet of four fruit speciesmay not prevent the accumulation of secondarycompounds to a damaginglevel resulting in low protein assimilation. Key words: frugivory;fruit preference:nutrition; Yellow-ventedBulbul; Pycnonotusxan- thopygos;digestion; metabolizability. and Safiiel 1985, 199 1, unpubl. data), mixed date INTRODUCTION palm-citrus orchards in Iraq (Al-Dabbagh et al. The relationship between plants which produce 1987), gardens and palm groves in western Ara- fleshy fruits and their dispersers is based partially bia (Meinertzhagen 1954) and the Ethiopian on the nutritional value of the fruit for the dis- lowland forest and non-forest habitats (Moreau perser. The ability to digest fruit is believed to 1972). The northern limit of the distribution of be an important constraint on the evolution of the Pycnonotidae in the Old World is in the Mid- the interaction between plants bearing fleshy- dle East which is populated by the Yellow- fruits and fi-ugivorous birds (e.g., Herrera 1984, vented Bulbul Pycnonotus xanthopygos. The bul- Jordan0 1988, Worthington 1989). bul consumes and dispersesseveral fruit species In previous experiments, frugivorous birds of in the Israeli scrublands (Izhaki 1986; Izhaki the eastern Mediterranean avifauna were fed on and Safriell985,1990b, 199 l), and is one of the a single fruit speciesexclusively (Izhaki and Saf- most important frugivorous birds in the Israeli riel 1989). Although birds ate large amounts of avifauna. In this study, I fed these bulbuls four fruit they nevertheless lost mass due to poor ni- fruit speciescommonly available from June to trogen assimilation. It was assumedthat nutrient August in the northern parts of Israel (Rhamnus intake would be better balanced by feeding the alaternus, Lonicera etrusca, Rubia tenuifolia, birds on several fruit species rather than on a Ephedra aphylla, unpubl. data). These foods are single one, since a mixed diet could increase the relatively poor in proteins and lipids, but rich in possibility of extracting specific nutrients (e.g., carbohydrates and water. The profitability of Jordan0 1988, Mack 1990) and could reduce ac- these fruits is reduced by their poor protein and cumulation of specific secondary compounds lipid content as well as their indigestible seeds (Jordan0 1988; Izhaki and Safiiel 1989, 1990a; (Herrera 1981, Levey 1986, Jordan0 1988). Levey and Karasov 1989). In the current paper, I investigate the following The Pycnonotidae are well-known frugivores questions. (1.) Are bulbuls fed on a mixed diet in regions of the Old World such as the Malay- of several fruit speciesbetter able to maintain a sian lowland rain forest (Lambert 1989) scrub constant body mass than bulbuls fed exclusively and bush-jungle in India (Whistler 1949) eastern on single fruit species?(2.) Does a mixed fi-uit- Mediterranean scrubland (Izhaki 1986; Izhaki diet improve protein, fat, carbohydrate, mineral and energy digestion? and (3.) Is the choice of a ’ Received 17 February 1992.Accepted 10 July 1992. fruit speciesby birds connected with a particular [9121 NUTRITIONAL QUALITY OF FRUIT DIET 913 nutritional or morphological characteristicof the daily from several different plants within each fruit? species. After the bulbuls’ mass stabilized, three groups METHODS of six different individuals were offered an ex- clusive diet of one fruit specieseach, and a fourth FEEDING TRIALS group of six birds was offered a mixed diet con- I collected fruits and birds for thesetrials around taining the four fruit species.In each experiment the University of Haifa at Oranim campus, Israel I used six birds picked randomly from the pool (32”43’N, 35”07’E), during the summer and fall of 30 bulbuls. Lonicera, however, was too rare of 1989 and 1990. Bulbuls were captured using in the area for an experiment to use this fruit mist netting and held in individual indoor cages exclusively. Each type of food was provided ad (40 x 50 x 80 cm) fitted with easily cleaned libitum for several days, as well as water ad li- undercarriages.The bulbuls were maintained at bitum, at 08:OOhours. In the trials using all four room temperature (25” * 3°C) with artificial light fruit species I offered an equal wet biomass of for 12 hr each day in addition to natural sunlight. each fruit speciesplaced randomly on the cage In captivity, the birds were fed domestic fruits floor at 08:OOhours every day. (apples, peaches, grapes, watermelons, and or- Each day I measured the total wet mass of the anges), vegetables (tomatoes, cucumbers, and fresh fruit provided, the total wet mass of fruits peppers), eggs,bread, and invertebrates (meal- left uneaten from the previous day’s provision, worms and locusts) for several days, until their the total wet mass of the excreted seeds,and the body mass stabilized, usually after lo-20 days. total wet massof the non-seed excreta (for a more There was no difference between the birds’ mass detailed description of this procedure see Izhaki when captured (37.7 ? 2.6 g) and on the first day and Safriel 1989). The non-seed excreta were of experiment (36.6 * 2.8 g, paired t-test t2, = oven-dried until they reached a constant mass 1.06, P > 0.05). and reweighed to obtain the dry mass of excreta Fecal analysis of 14 bulbuls captured in Beit per day (Qe). I weighed the birds daily at 08:OO Jimal, Judean Hills, Israel, between July and hr to determine whether or not to continue the February demonstrated that the birds ate five experiment. Trials lasted five to 10 days each. fruit species(Rubia tenuifolia, Asparagusaphyl- At the end of each trial, the bird was fed on the lus, Smilax aspera, Rhamnus palaestinus, and pre-experiment mixed diet. Its mass was moni- Pistacia lentiscus)with an average of 1.4 * 0.9 tored at five-day intervals for an additional 30 fruit speciesper bird (Izhaki 1986). Fecal analysis days. of 49 bulbuls captured at Ramat Hanadiv, Israel, between November and January revealed that NUTRITIONAL ANALYSIS the birds consumed five fruit species(Phillyrea Many fresh fruits (usually hundreds) were col- latifolia, A. aphyllus, Ephedra aphylla, R. pa- lected from each plant species.Fresh pulp from laestinus,P. lentiscus)with an average of 1.6 * the fruits were mixed, dried and divided into two 0.7 fruit speciesper bird (Adar 199 1). Two fruit samples. These samples of dried pulp from the speciesidentified by this analysis and one con- four fruit species and the dry feces from each generic specieswere used in the present study. experiment were analyzed for lipids, nitrogen, Becausebulbuls are frequently observed eating reducing sugars,ash, and several cations (Na, K, Lonicera fruits around our campus and in other Ca, P), according to AOAC (1975) procedures. locationsin Israel (Izhaki, pers. observ.), this fruit I estimated protein content of all speciesexcept was added to the diet. The data on fecal analyses Ephedra as total N x 6.25 (Bondi 1987). Ephed- covers a period of several months, but bulbuls ra is well known for its relatively high content actually consume fewer fruit speciesover shorter of alkaloids such as ephedrines (Herrera, pers. periodsof time, dependingon availability. Hence, comm.). Such nonprotein nitrogenous com- the four fruit speciesfed to bulbuls in this study pounds may cause overestimation of protein representgreater fruit diversity than exists in na- content when the traditional 6.25 factor is used ture. The four fleshy fruit species(madder, Rubia and so the protein content of Ephedra fruits was tenuifolia; buckthorn, Rhamnus alaternus;joint analyzed separately using Biotronic LC 5000 pine Ephedra aphylla; and honeysuckle, Lonic- Amino Acid Analyzer (Moore and Stein 195 1). era etrusca) used in feeding trials were picked This indicated that the correct conversion factor 914 ID0 IZHAIU for Ephedra fruits was 4.3, which was close to RESULTS 4.4, suggestedby Milton and Dintzis (198 1) for NUTRITIONAL CONTENT OF FRUITS tropical plants. I also measured the sugarcontent in the fruit juice in the field using a hand refrac- The four fruit specieshad a juicy pulp K = 70.3% tometer. The caloric content of dry pulps and + 7.8% water content), which was relatively poor feceswas estimated using the average grossen- in crude protein (4.6% + 1.6% of dry mass) and ergy equivalents of protein (17.2 kJ/g), fat (38.9 rich in carbohydrates (> 72% of dry mass, Table W/g) and carbohydrates (17.2 kJ/g, see Karlson 1). However, the pulps of Rhamnus and Ephed- 1972). ra contained almost twice as much protein as the pulps of Rubia and Lonicera. The pulp of METABOLIZABILITY COEFFICIENTS Rubia was relatively rich in lipids but relatively I calculated the Apparent Metabolizability (AM) poor in carbohydrates, and had no sugarsin its for each dietary constituent x, AMx by AMx = juice (Table 1).
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