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Flowering Phenology, Floral Traits and Pollinator Composition in A

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Flowering Phenology, Floral Traits and Pollinator Composition in A View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Digital.CSIC Jordi Bosch · Javier Retana · Xim Cerda´ Flowering phenology, floral traits and pollinator composition in a herbaceous Mediterranean plant community Abstract The relationships between flowering plants indicate that the observed patterns of visitor distribution and their insect visitors were studied in a Mediterranean among plants were most affected by pollen-nectar grassland in north-east Spain. Floral traits (size, shape, rewards. symmetry, and colour), floral rewards (pollen and nec- tar), flowering period, and floral visitors were recorded Key words Plant community · Flower visitors · Flowering for the 17 most abundant plants in the community. periods · Flower traits · Flower rewards Flowering was year-round, but most species flowered in spring. The three species that flowered after spring had small flowers, but the distribution of floral features (in- Introduction cluding rewards offered) did not show a strong season- ality. Ants contributed 58.5% to the flower visits re- The spectra of visitors to flowering plants in a particular corded. Other frequent visitors were beetles (12%), flies area are determined by many factors, the most obvious (9.5%), honey bees (6.4%), wild bees (6.4%), and wasps of which is the overlap between the flowering periods of (5.2%). Honey bees were most abundant in April, wild each species and the activity periods of the anthophiles bees from April to July, beetles from May to July, and in that area. Given this overlap, each plant species pre- ants from May to September. The lack of tight plant- sents particular morphological and physiological char- insect associations was the rule, with most plant species acteristics that can attract certain groups of floral visited by a rather diverse array of insects representing visitors over others. Traditionally, this differential flower two or more orders. The plant species having narrower attractiveness has been given major importance in in- spectra of visitors either had flower rewards exposed or terpreting why particular visitors are observed on par- attracted mostly illegitimate visitors. By means of cor- ticular flowers and this has led to the establishment of respondence analysis four categories of plants were de- ‘‘pollination syndromes’’ (based on flower colour, shape, fined according to their main groups of visitors: (1) odour, rewards and breeding systems), supposedly honey bees and large wild bees; (2) large wild bees; (3) adapted to specific types of pollinators (Faegri and van ants and beetles; and (4) beetles and small-sized bees. der Pijl 1966). More recent anthecological studies have The Mantel test was used to calculate correlations emphasised the relationship between energetics of flower among four matrices representing similarities in visitors visitors and floral rewards (Heinrich and Raven 1972; attracted, floral morphological traits, pollen-nectar Heinrich 1975). Under this approach, flower rewards rewards, and blooming time, respectively. In spite of may be considered as the ultimate ‘‘attractants’’, seasonality shown by the different insect groups, results whereas colour, odour and shape would act rather as ‘‘cues’’ used by visitors to discriminate between the dif- ferent reward sources available (Waser 1983a). Many J. Bosch studies have confirmed the importance of nectar and/or Bee Biology and Systematics Laboratory, USDA-ARS, pollen offered by flowers in determining how available Utah State University, Logan, UT 84322-5310, USA anthophiles are partitioned between available flowering J. Retana (&) plants (e.g. Heinrich 1975; Tepedino and Parker 1982; Unidad de Ecologı´a y CREAF, Facultad de Ciencias, Universidad Auto´noma de Barcelona, E-08193 Bellaterra (Barcelona), Spain Bosch 1992). As pointed out by Waser (1983a), however, fax: (34 3) 581 13 12; e-mail: [email protected] pollinators with similar energetic or nutritional re- X. Cerda´ quirements have been shown to visit flower species Unidad de Ecologı´a Evolutiva, Estacio´n Biolo´gica de Don˜ ana, offering a very wide range of rewards, and the same plant CSIC, Apdo. 1056, E-41080 Sevilla, Spain species may receive quite different visitor assemblages 4 depending on the year (Tepedino and Stanton 1981; morphology, and the type of symmetry were recorded. Flower C.M. Herrera 1988), the habitat conditions (Primack forms were referred to those of Faegri and van der Pijl (1966). The number of flowers per inflorescence and the size (maximum 1978; Arroyo et al. 1982; C.M. Herrera 1988), or even transversal diameter) of flowers and/or inflorescence (pollination the individuals sampled within a same site and year units sensu Faegri and van der Pijl, 1966) was measured in samples (C.M. Herrera 1988; Ashman and Stanton 1991). of twenty pollination units for each plant species. Competition and facilitation between plants for visitors To investigate floral rewards, 20 flowers of each plant species (reviews in Pleasants 1983; Rathcke 1983; Waser 1983b), were covered with fine mesh gauze bags to exclude insects. Twenty- four hours after the flowers opened, the mesh bags were removed and competition for flowers between insects (Morse and accumulated nectar was extracted with micropipettes (0.25, 0.5, 1977; Inouye 1978, Pleasants 1981) have been shown to 1, 2, and 5 ml). About-to-dehisce anthers of each plant species were influence visitor distribution among flowers. While being collected, placed in small Petri dishes and allowed to dry until they always ultimately related to the energetic trade-offs be- dehisced to fully expose their pollen. Anther tissues were separated carefully and pollen production was estimated by weighing (to the tween flowers and their visitors, these phenomena have nearest 0.01 mg) the total amount of pollen in ten groups of fresh emphasised the need to study whole plant communities anthers from five to ten flowers (depending on plant species). to fully understand plant-pollinator interactions in an ecologically realistic situation. Flowering phenology and insect censuses The number of studies following the community ap- proach is increasing, but available information is frag- Three 25-m-long transects were laid across the study area, from mentary at best. As far as Mediterranean ecosystems are April to October 1986. To determine flowering periods, the number concerned, our knowledge is restricted to woody com- of pollination units with open flowers of each plant species was munities (J. Herrera 1988; McCall and Primack 1992; counted at every transect once every other week. On each sampling day, insect counts were made from 8.00 a.m. Dafni and O’Toole 1994; J. Bosch and A. Bonet, un- to 8.00 p.m. by slowly walking the transects every 2 h. All insects published work). Moreover, the majority of community- observed foraging on the flowers within 1 m either side of the level anthecological studies are basically descriptive, transect were identified by sight and recorded. For a few plant with few attempts made (e.g. McCall and Primack 1992; species poorly represented in the transects, additional plants were J. Herrera 1988; Petanidou and Vokou 1993) to quan- sampled to obtain comparative data of insect visits. Bees were visually determined to genus, and grouped in four categories: small- titatively evaluate the importance of the different factors sized bees (body length < 8 mm, including species of Ceratina, involved in determining anthophile distribution among Andrena, Lasioglossum, and Hylaeus), medium-sized bees (body plants. In this study, we describe the insect-flower rela- length 8–12 mm, including species of Osmia, Panurgus, Halictus, tionships in a herbaceous community of ruderal plants Megachile, Sphecodes, Colletes, Heliophila and Crocisa), large- sized bees (body length > 12 mm, including species of Bombus, on the Spanish Mediterranean coast, and we examine Xylocopa, Melitturga, Eucera, Amegilla, Anthophora and Ant- the importance of time of bloom, morphological flower hidium), and honey bees (Apis mellifera). Non-apoid visitors were traits (shape, size and colour) and rewards offered by the determined to family level. Data for each plant were summarised by plants (pollen and nectar) in determining the spectra of summing the number of floral visitors over all sampling dates and visitors monitored. pollination units. Data analysis Materials and methods The spectra of flower visitors of each plant species were processed Study area using correspondence analysis to generate a smaller number of factors from the original variables (insect groups), which better The study area site (c. 2000 m2) is located in Canet de Mar (Bar- explained the dispersion of the data (ter Braak 1987). From the co- celona, north-east Spain) (41°25′N, 23°7′E) at 50 m above sea level ordinates of the first axes obtained at the correspondence analysis, and 750 m inland. The climate is Mediterranean with a strong sea plants were grouped into classes of pollinator assemblages by influence. Mean annual temperature is 16.1°C, with January being cluster hierarchical methods. the coldest month (mean: 8.5°C) and July the hottest (mean: To investigate the relative importance of floral morphology, 24.1°C). Mean annual precipitation is 757 mm, of which 195 mm floral rewards and time of flowering of each plant species in de- accumulate during the spring and 277 mm in autumn. July is the termining what insects go to what plants, four different matrices driest month, but there is no severe summer drought. (named INSECTS, MORPHOLOGY, REWARDS and PHENO- The community
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