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Ants, Rodents and Seed Predation in Proteaceae

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Ants, Rodents and Seed Predation in Proteaceae Ants, rodents and seed predation in Proteaceae W.J. Bond and G.J. Breytenbach Saasveld Forestry Research Centre, George Many species of Cape Proteaceae have seeds dispersed by Mynnecochory, the mutualistic dispersal of seed by ants, is ants. Ants may reduce seed predation by rapidly transporting common in fynbos, and particularly well developed in the Pro­ and burying seeds in their nests. Three field experiments using teaceae (Slingsby & Bond 1983; Bond & Slingsby 1983). The ant and vertebrate exclosures were set up to determine whether predation of Mimetes pauciflorus and Leucospermum g/abrum fruits of Leucospermum, Mimetes, Orothamnus, and Parano­ fruits is significant, whether ants reduce it, and whether the mus typically have large elaiosomes (food lxxlies) which attract food body (elaiosome) is important in the interaction. Results ants and are eaten by them. Ants discover, transport and bury showed that seed predation could be as high as 100%, but that the fruits in their nests extremely rapidly. ants usually discover and remove seeds before vertebrates. Significantly fewer seeds were dispersed by ants when One benefit of the ant-plant interaction may be seed escape elaiosomes were removed. Vertebrate removal rates also from predators. Elaiosome-gathering ants do not eat mynne­ declined. Laboratory experiments with caged small mammals cochorous seed which is usually smooth coated, thick walled showed that intact seeds were found more readily than seeds from which elaiosomes had been removed and that seed dis· and difficult for ants to manipulate after the elaiosome is eaten covery improved with experience. Different species varied in (Berg 1975; Bond & Slingsby 1983). Ant dispersal may, how­ their ability to detect seeds. Our results suggest that seed ever, result in reduced predation by vertebrates, because of dispersal by ants has a direct effect on the number of seeds . rapid seed burial in ant nests (O'Dowd & Hay 1980; Heithaus, ) entering the soil seed bank by reducing predation, that 0 Culver & Beattie 1980; Heithaus 1981; Culver & Beattie 1978). 1 myrmecochorous seeds produce a signal which attracts both 0 ants and small mammals, and that once seeds are buried in ant We studied the role of ants in reducing predation on Protea­ 2 nests predation is probably minimal. ceae seed in hygrophilous fynbos by addressing the questions: d e t S. Afr. J. Zool. 1985,20: 150-154 (i) Do vertebrates, especially small mammals, eat significant a d numbers of Proteaceae seed? ( Verskeie Kaapse Proteaceae se sade word deur miere versprei. r Aangesien miere die sade vinnig opspoor en in hulle neste (ii) Does seed dispersal by ants reduce seed loss to ver­ e h begrawe, verlaag hulle waarskynlik predasie deur ander tebrates? s i l organismes. Drie eksperimente is in die. veld uitgevoer (iii) Do elaiosomes attract ants or small vertebrate seed b waartydens miere en/of vertebrate uitgesluit was, om vas te stel u predators? of vertebrate Mimetes pauciflorus en Leucospermum g/abrum P (iv) Can small mammals locate buried seed? e vrugte kan opspoor en sal vreet, of miere die predasie verlaag, h en of die voedselliggaampie (elaiosoom) 'n belangrike rol in t Field experiments y hierdie verband speel. Resultate toon dat saadpredasie deur b vertebrate baie hoog is en dat tot 100% saadverlies voorkom. Methods d Miere ontdek en verwyder egter gewoonlik sade voordat verte· e t brate dit vind. Beduidend minder sade word deur miere versprei Leucospermum glabrum and Mimetes pauciflorus both occur n a en/of deur vertebrate opgevreet indien die elaiosoom verwyder in hygrophilous fynbos of the Outeniqua mountains. Both r word. Laboratoriumeksperimente met sade wat op verskillende g have achenes (hereafter referred to as seeds) with prominent e dieptes begrawe is, het getoon dat kleinsoogdiere sade met c elaiosome makliker vind as sade sonder elaiosome en dat hulle elaiosomes formed by fleshy swellings beneath the pericarp n e meer sade uitgrou met opeenvolgende pogings. Die effektiwiteit at the base of the fruit and below the style. The entire pericarp c i l van'saaqopsporing deur die kleinsoogdiere het gewissel van is often eaten by ants. Both species are killed by fire and , r sp.esie. tot spesie. Sade met elaiosome produseer 'n reuk wat e regenerate only from seed stored in the soil. •. d deur b~de lIie miere en muise erken word. Nadat sade in ;'. n miemeste begrawe is, is saadpredasie waarskynlik minimaal. The study was conducted on Tierkop (33°55 'S/22°31 'E), in u ., . Miere het dus 'n direkte invloed op die aantal sade wat tot die the Outeniqua mountains, near George. The vegetation was a y \. 'sali«ti~nKa toegevoeg word deurdat hulle sade begrawe en so· dense 12-year-old shrubland, mid-height ca. I m and dominat­ " w doende saadpredasie verlaag. e ed by Penaea cneorum, Grubbia tomentosa, Erica arachnoi­ . "5.;Ak.t ·TYdskr. Dierk. 1985, 20: 150 -154 a dea, and Restio compressus with scattered M. pauciflorus and G t L. glabrum on steep, mesic, south-facing aspects. Soils were e n moist loams with a black, organic matter rich A horiwn over­ i b lying Table Mountain Sandstone at 40 - 60 em. a S The rate of seed removal by ants was compared with rate y b W.J. Bond· and G.J. Breytenbach of seed loss to vertebrates using exclosure experiments. d Saasveld F.R.C., Private Bag X6515, George, 6530 Republic of South Exclosures were replicated at 10-15 stations placed at least e c Africa. 10 m apart in a grid. At each station, three exclosure treat­ u d ments were used: o "To whom correspondence should be addressed r (i) Ants were excluded from access by a) glueing seed to p e Received I3 June 1984; accepted 16 January 1985 wooden blocks (ca. 10 x 10 cm) with a colourless, R S. Afr. J. Zoo!. 1985,20(3) 151 (odourless to humans when dry) household glue or, b) counting vertebrate predation only from depots at which placing seed in a Petri dish with the rim smeared with opened seed husks were found. Formex, a sticky grease. Small mammals seem to be the major vertebrate seed preda­ (ii) Vertebrates were excluded by a) wire mesh exclosures tors. All seed remnants were typical of those produced by the size and shape of inverted waste paper baskets or small mammals in laboratory feeding experiments. Granivo­ b) by securing a lid 5 mm above a Petri dish so that rous birds are rare in the southern Cape mountain fynbos ants had access to seeds but vertebrates did not. and none were seen in the study area. (iii) Controls excluding both ants and vertebrates were used Results of the three experiments are shown in Tables 1-3. to test the efficiency of the exclosures using a combination Ants removed more than 95070 of intact seed within 24 h (from of the above. depots to which they had access) in the first and last experi­ Eight to 10 seeds were used for each treatment. ment and 79070 in the second. Small mammals ate a large pro­ We report the results of three experiments the frrst of which portion of the seed unavailable to ants but were slower at used freshly collected seed of L. glabrum and was conducted discovering seed in the first and last experiment (Tables I & from 3 - 5 December 1981. The second was from II - 13 De­ 3: p < 0,01 for ants versus small mammals after one day, both cember 1981, also using L. glabrum, but with seed that had experiments, Fisher's Exact Test). Small-mammal activity been refrigerated for three days (until the weather cleared). could be easily identified by neatly opened or crushed seed Seed with elaiosomes present was used at 10 stations, each husks near depots. They also typically removed all seed from alternating with another 10 at which we used seed from which a depot once it had been discovered. In the second experiment, elaiosomes had been removed (by hand). The third experiment seed predation exceeded seed removal by ants from the first used freshly collected, intact seed of Mimetes paucijlorus and day (Table 2: p < 0,05 after one day, Fisher's Exact Test). was conducted from 10 to II March 1982. Wire mesh and Since this experiment was repeated at the same stations and glued seed exclosures were used in the first and third within a few days of the frrst, small mammals may have learnt experiment and Petri dish exclosures in the second. the location of the depots. Non-parametric tests are used in statistical tests since seed predation data do not meet assumptions of normality and Importance of elaiosomes equality of variance. We have however used standard mea­ Rates of seed removal by ants were significantly reduced when sures of dispersion. elaiosomes were removed (Table 2: p < 0,01 after one day, Fisher's Exact Test). Some ant dispersal still took place, how­ Results ever, since ants were able to eat and transport seed by adhering Ants responded very rapidly to fresh seed with elaiosomes, as pericarp fragments that had not been removed. Both the peri­ . is usual for myrmecochorous fynbos Proteaceae (Slingsby & carp and fleshy swellings of Mimetes and Leucospermum ) 0 Bond 1983). Many seed depots were swanning with ants before fruits therefore function as 'overall elaiosomes' (Slingsby & 1 0 the layout of exclosures was completed. Response was not as Bond 1983). Interestingly, small-mammal predation was also 2 d rapid with the seed that had been stored in a refrigerator before e t use. Ants are very sensitive to weather conditions and activity a Table 1 d ceases if the vegetation is wettened by mist or rain.
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