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Classification and Ecological Relationships of Seed Dormancy in a Seasonal Moist Tropical Forest, Panama, Central America

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Classification and Ecological Relationships of Seed Dormancy in a Seasonal Moist Tropical Forest, Panama, Central America Seed Science Research (2007) 17, 127-140 DOI: 10.1017/S0960258507708127 Classification and ecological relationships of seed dormancy in a seasonal moist tropical forest, Panama, Central America Adrians Sautu1'2, Jerry M. Baskin1*, Carol C. Baskin1'3, Jose Deago2 and Richard Condit2 ^ Department of Biology, University of Kentucky, Lexington, KY 40506-0225 USA; ^Smithsonian Tropical Research Institute, Panama City 34002-0948, Panama; ^Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY 40546-0312 USA Abstract Introduction This is the first study to determine the class of seed Considerable diversity in the kinds of seed dormancy dormancy (or non-dormancy) of a large number of exists among plants (Nikolaeva, 1977; Nikolaeva et ah, native tree species in a tropical forest, the seasonal 1985; Baskin and Baskin, 1998; 2004). Yet, most moist tropical forest of the Panama Canal Watershed publications on seed dormancy have not indicated, (PCW), or to test the relationships between class of or even suggested, the kind of dormancy that is dormancy (or non-dormancy) and various seed and investigated (Baskin and Baskin, 2004), and certainly ecological characteristics of the constituent species. there are no such studies at the community or Fresh seeds of 49 of 94 tree species were non- vegetation-type level. Baskin and Baskin (2004) dormant (ND), and 45 were dormant (D). Seeds of 23 proposed a hierarchical classification system for seed species had physiological dormancy (PD), 13 dormancy, based on Nikolaeva (1977), that attempts to physical dormancy (PY), two morphological dormancy accommodate the diversity of the kinds of dormancy (MD), 7 morphophysiological dormancy (MPD) and among seeds worldwide. The proposed system none combinational dormancy (PY + PD). Seeds with includes five classes (physiological, morphological, PY were significantly smaller (<0.1g) and drier morphophysiological, physical and combinational) of (moisture content <16%) at maturity than those that dormancy and, within some of the classes, levels and were ND or in the other D classes. Seeds of 62, 42 and types, i.e. levels within classes and types within levels. 53% of species dispersed in the early rainy, late rainy Baskin and Baskin (2005) determined the pro- (LRS) and dry seasons, respectively, were ND. The portion of tree species with non-dormant seeds, and of majority (61 %) of species with PD seeds, but only 17% those within each of the five classes of dormancy, in of those with PY seeds, were dispersed in the LRS. The the evergreen to deciduous tropical forest gradient on proportion of species with ND seeds was higher in a worldwide scale from a list of >2000 species large-size (63%) than in mid-size (35%) and under- compiled from the literature. However, heretofore, no storey (17%) trees, but differed only slightly between one has determined how non-dormancy and each of non-pioneers (58%) and pioneers (54%). The pro- the five classes of dormancy are proportioned among portion of species with 0 seeds increased only slightly species in a given (contiguous) area of tropical forest through a precipitation gradient of about 3100 to of any type. Neither has anyone investigated the 1900 mm in the PCW; however, PY increased from 19 relationship between the kind of seed dormancy (or to 32% and PD decreased from 63 to 44%. non-dormancy) and the various seed or ecological characteristics of the constituent species at the Keywords: Panama Canal Watershed, precipitation gradient, seasonal moist tropical forest, seed dormancy community/vegetation-type level. classes, seed ecology There are clear patterns of floristic spatial organization and of deciduousness, and other leaf traits, of species along the 1200 mm steep rainfall gradient of the 60 km of continuous seasonal moist tropical forest in the Panama Canal Watershed (PCW) (Pyke et ah, 2001; Condit et ah, 2004; Santiago et al., "Correspondence 2004). The gradient across the PCW presents an Fax: +1859 2571717 excellent opportunity, not only to determine how seed Email: [email protected] non-dormancy and the five classes of seed dormancy 128 A. Sautu et al. are distributed among species within a tropical forest, (sensu Grushvitsky, 1967)], regardless of median but also to test the relationship between the kinds of length of germination time (MLG), or if the seeds dormancy and climatic wetness / dryness within this had a fully developed embryo and MLG >30d forest. The purposes of this study were to: (1) classify without any pretreatment. Seeds were considered as (sensu Baskin and Baskin, 2004) the kinds of dormancy non-dormant if the embryos were fully developed and (and of non-dormancy) in seeds of the seasonal moist MLG was <30d. Then, following Baskin and Baskin tropical forest of the PCW; (2) test the relationship (2004), we further grouped the species with dormant between class of dormancy and seed mass, seed seeds into five classes: (1) physical dormancy (PY), moisture content, dispersal season, tree colonizing species with a water impermeable seed (or fruit) coat status and tree growth form; and (3) test the (always with a fully developed, non-dormant relationship between the kind of dormancy and embryo); (2) morphological dormancy (MD), species mean annual precipitation along the rainfall gradient. with an underdeveloped embryo and an MLG < 30 d; (3) morphophysiological dormancy (MPD), those with an undeveloped embryo and an MLG >30d; (4) Materials and methods physiological dormancy (PD), those that have a water- permeable seed (or fruit) coat, a fully developed Site description embryo and an MLG >30d; and (5) combinational dormancy (PY + PD), species with a water-imperme- The PCW encompasses 2892 km2 of land at 9° north able seed (or fruit) coat and a physiologically dormant latitude in the seasonal tropics. The mean annual (always fully developed) embryo. temperature is 27°C. Mean annual rainfall varies from A seed was considered to have PY or (PY + PD) if about 1600 mmyr-1 on the Pacific coast to > 3000 mm it did not imbibe water without pretreatment, and/or on the Caribbean coast. The dry season lasts 3-4 if the species belongs to a family or to one of its months from mid-December to mid-April (Condit, taxonomic subdivisions (e.g. Anacardiaceae, Rhus 1998). In this study, we divided the year into three complex) known to have a water-impermeable seed precipitation seasons: dry (January-March), early (or fruit) coat (Baskin et al, 2000). Water uptake rainy (April-July) and late rainy (August - December). (imbibition) was compared in scarified seeds (dipped The justification for doing this is discussed in Sautu in boiling water or mechanically scarified with a file or et al. (2006). Most of the watershed is <300m above knife) versus non-scarified seeds of six species (Apeiba sea-level, but elevation rises to 1000 m on three peaks aspera, Colubrina glandulosa, Enterolobium cyclocarpum, to the south-west and east (Condit et al, 2001). E. schomburgkii, Luehea seemannii and Ormosia macro- In spite of the considerable variation in amount of calyx) suspected to have PY (because of the families to rainfall and length of the dry season, mean annual which they belong), and for which enough seeds were precipitation is high enough to sustain a tall forest available for testing. Imbibition studies were also throughout the region. The general structure of forests conducted on five additional species (Andira inermis, of the canal area is quite similar, except for small areas Amaioua corymobosa, Ficus insipida, Heisteria concinna of mangrove, freshwater swamps and mountain and Trema macrantha) to resolve conflicting literature peaks. A closed canopy, 20-40 m tall with emergent reports of water impermeability versus water per- trees reaching 50 m in height, and a dense understorey meability of their seeds. The diaspores (dispersal of saplings, treelets, palms and lianas can be found in units) were weighed and placed on moist filter paper well-drained sites (Condit et al., 2001). The majority of at room temperature (c. 22°C). Then, at time 0, and at the watershed (90%) is classified as tropical moist various intervals for 24-48 h, seeds were removed forest in the Holdridge (1967) system (Tosi, 1971). from the wet paper, blotted dry and reweighed. Large disturbances, such as hurricanes and fires, are Percentage water uptake was calculated as the actual absent; thus, individual treefalls and small increase in fresh seed mass, based on seed mass at windstorms are the sole natural source of canopy time 0: turnover. Sautu et al. (2006) contains a more detailed %W, [(Wi - Wo)/Wo] X100, summary-description of the PCW. where %WS = percentage increase in seed mass, W; = mass after a given interval of time and W0 = seed Assignment to seed dormancy class mass at time 0. A considerable increase in mass indicates that the seed has a water-permeable coat, First, we grouped species into two categories: those whereas no increase in mass indicates that it has a with non-dormant seeds and those with dormant water-impermeable coat. seeds. A seed was considered to be dormant if it had The effect of scarification on germination was also an underdeveloped embryo [i.e. one that must grow tested on seeds of the six species listed above inside the seed before the radicle can emerge suspected to have PY, for which imbibition curves Seed dormancy of tropical Panamanian forest trees 129 were prepared, and for Guazuma ulmifolia, Luehea 2125-2360mm; zone 3, 2361-2598mm; zone 4, 2599- speciosa and Sapindus saponaria that also belong to 2835 mm; and zone 5, 2836-3072 mm. The number of families in which seeds of some species have PY. our study species in the plots for each of the five zones Germination and imbibition curves for scarified was 53, 63, 76, 57 and 63, respectively. Then, the versus non-scarified seeds, MLG and information in proportion of species with seeds in each class of the literature on seed germination and /or taxonomic dormancy (including ND) was calculated for each relationships were used to determine if a species had a rainfall zone along the gradient.
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