Abstract
The recruitment pattern of Satureja thymbra (Lamiaceae), in a single and isolated population in Sardinia, was experimentally investigated by human-mediated sowing in the field: 12 plants in two habitats (inside and outside of “phrygana” habitat) were randomly selected as the source of seeds and a total of 2160 seeds were buried in two microhabitats, under the canopy and in open areas (3 replicas × 30 seeds × 12 plants × 2 microhabitats). The experiment was monthly monitored over a 2-year period. Germination and recruitment of S. thymbra were extremely low. Significant differences in the interaction among habitat and cohorts in seedling emergence were found. Differences between cohorts are due to the early emergence, which protected seedlings from seasonal drought. Seedling emergence in both microhabitats was recorded, although no significant differences were found. Additionally, significant differences in survived seedlings for habitat and cohort and for the interaction among them were found. The phrygana habitat showed a positive effect on the persistence of S. thymbra, by protecting plants from human disturbance, hence its conservation is essential to increase the population size of S. thymbra. Our findings, increasing the knowledge of the recruitment pattern of S. thymbra, provide also useful information for its conservation.
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References
Andivia E, Villar-Salvador P, Tovar L, Rabasa S, Rey Benayas JM (2017) Multiscale assessment of woody species recruitment in Mediterranean shrublands: facilitation and beyond. J Veg Sci 28:639–648. https://doi.org/10.1111/jvs.12520
Ballantyne M, Pickering CM (2015) The impacts of trail infrastructure on vegetation and soils: current literature and future directions. J Environ Manag 164:53–64. https://doi.org/10.1016/j.jenvman.2015.08.032
Biondi E, Mossa L (1992) Studio fitosociologico del promontorio di Capo S. Elia e dei colli di Cagliari (Sardegna). Doc Phytosoc 14:1–44
Bocchieri E, Fogu MC, Bacchetta G, Mossa L (2000) Le piante rare e/o in pericolo di estinzione della provincia di Cagliari e la strategia dell’Orto Botanico per la conservazione della biodiversità. Boll Soc Sarda Sci Nat 32:157–167
Bond WJ, Honig M, Maze KE (1999) Seed size and seedling emergence: an allometric relationship and some ecological implications. Oecologia 120:132–136
Bryant MM (2006) Urban landscape conservation and the role of ecological greenways at local and metropolitan scales. Landsc Urban Plan 76:23–44. https://doi.org/10.1016/j.landurbplan.2004.09.029
Callaway RM (1995) Positive interactions among plants. Bot Rev 61:306–349
Castilla AR, Alonso C, Herrera CM (2011) Exploring local borders of distribution in the shrub Daphne laureola: individual and population traits. Acta Oecol 37:269–276. https://doi.org/10.1016/j.actao.2011.02.011
Çatav ŞS, Bekar I, Ateş BS, Ergan G, Oymak F, Ülker ED et al (2012) Germination response of five eastern Mediterranean woody species to smoke solutions derived from various plants. Turk J Bot 36:480–487. https://doi.org/10.3906/bot-1111-12
Çatav ŞS, Küçükakyüz K, Akbaş K, Tavşanoğlu Ç (2014) Smoke-enhanced seed germination in Mediterranean Lamiaceae. Seed Sci Res 24:257–264. https://doi.org/10.1017/S0960258514000142
Çatav ŞS, Küçükakyüz K, Tavşanoğlu Ç, Pausas JG (2018) Effect of fire-derived chemicals on germination and seedling growth in Mediterranean plant species. Basic Appl Ecol 30:65–75. https://doi.org/10.1016/j.baae.2018.05.005
Cerabolini B, Ceriani RM, Caccianiga M, De Andreis R, Raimondi B (2003) Seed size, shape and persistence in soil: a test on Italian flora from Alps to Mediterranean coasts. Seed Sci Res 13:75–85. https://doi.org/10.1079/SSR2002126
Cogoni D, Mattana E, Fenu G, Bacchetta G (2012) From seed to seedling: a critical transitional stage for the Mediterranean psammophilous species Dianthus morisianus (Caryophyllaceae). Plant Biosyst 146:910–917. https://doi.org/10.1080/11263504.2011.647106
Cogoni D, Fenu G, Bacchetta G (2013) Effects of timing of emergence and microhabitat conditions on the seedling performance of a coastal Mediterranean plant. Ecoscience 20:131–136. https://doi.org/10.2980/20-2-3583
Cogoni D, Sulis E, Bacchetta G, Fenu G (2019) The unpredictable fate of the single population of a threatened narrow endemic Mediterranean plant. Biodivers Conserv 28:1799–1813. https://doi.org/10.1007/s10531-019-01757-0
de Villalobos AE, Pelaez DV, Boo RM, Mayor MD, Elia OR (2002) Effect of high temperatures on seed germination of Prosopis caldenia Burk. J Arid Environ 52:371–378. https://doi.org/10.1006/jare.2002.1004
Dell’Agli M, Sanna C, Rubiolo P, Basilico N, Colombo E, Scaltrito MM et al (2012) Anti-plasmodial and insecticidal activities of the essential oils of aromatic plants growing in the Mediterranean area. Malar J 11:219. https://doi.org/10.1186/1475-2875-11-219
Euro+Med PlantBase (2020) The information resource for Euro-Mediterranean plant diversity. http://ww2.bgbm.org/EuroPlusMed/. Accessed 27 Jan 2020
Fenu G, Cogoni D, Navarro FB, Concas E, Bacchetta G (2017) The importance of the Cisto-Lavanduletalia coastal habitat on population persistence of the narrow endemic Dianthus morisianus (Caryophyllaceae). Plant Spec Biol 32:156–168. https://doi.org/10.1111/1442-1984.12138
Fenu G, Bacchetta G, Charalambos SC, Fournaraki C, Giusso del Galdo GP, Gotsiou P et al (2019) An early evaluation of translocation actions for endangered plant species on Mediterranean islands. Plant Divers 41:94–104. https://doi.org/10.1016/j.pld.2019.03.001
Gargano D, Fenu G, Medagli P, Sciandrello S, Bernardo L (2007) The status of Sarcopoterium spinosum (Rosaceae) at the western periphery of its range: ecological constraints lead to conservation concerns. Isr J Plant Sci 55:1–13
Géhu JM (1986) Des complexes de groupements végétaux à la phytosociologie paysagère contemporaine. Ital Bot [Inform Bot Ital] 18:53–83
Giménez-Benavides L, Escudero A, Iriondo JM (2007) Local adaptation enhances seedling recruitment along an altitudinal gradient in a high mountain Mediterranean plant. Ann Bot 99:723–734. https://doi.org/10.1093/aob/mcm007
Golan S, Waitz Y, Ziffer-Berger J, Barzilai M, Hanin N, Henkin Z et al (2019) Germination behavior of Sarcopoterium spinosum in response to smoke chemicals indicates adaptation to fire in the south-eastern Mediterranean. Isr J Plant Sci 66:103–111. https://doi.org/10.1163/22238980-00001069
Gómez JM, Hódar JA, Zamora R, Castro J, García D (2001) Ungulate damage on Scots pines in Mediterranean environments: effects of association with shrubs. Can J Bot 79:739–746. https://doi.org/10.1139/b01-055
Gómez-Aparicio L, Valladares F, Zamora R, Quero JL (2005) Response of tree seedlings to the abiotic heterogeneity generated by nurse shrubs: an experimental approach at different scales. Ecography 28:757–768. https://doi.org/10.1111/j.2005.0906-7590.04337.x
Gulias J, Traveset A, Riera N, Mus M (2004) Critical stages in the recruitment process of Rhamnus alaternus L. Ann Bot Lond 93:723–731. https://doi.org/10.1093/aob/mch100
He Q, Bertness MD, Altieri AH (2013) Global shifts towards positive species interactions with increasing environmental stress. Ecol Lett 16:695–706. https://doi.org/10.1111/ele.12080
Herranz JM, Ferrandis P, Martínez-Sánchez JJ (1998) Influence of heat on seed germination of seven Mediterranean Leguminosae species. Plant Ecol 136:95–103. https://doi.org/10.1023/A:1009702318641
Howell N (1981) The effect of seed size and relative emergence time on fitness in a natural population of Impatiens capensis Meerb. (Balsaminaceae). Am Midl Nat. https://doi.org/10.2307/2424749
Ibáñez I, Schupp EW (2001) Positive and negative interactions between environmental conditions affecting Cercocarpus ledifolius seedling survival. Oecologia 129:543–550. https://doi.org/10.1007/s004420100757
Itani M, Al Zein M, Nasralla N, Talhouk SN (2020) Biodiversity conservation in cities: defining habitat analogues for plant species of conservation interest. PLoS ONE 15:e0220355. https://doi.org/10.1371/journal.pone.0220355
Kadis C, Georghiou K (2010) Seed dispersal and germination behavior of three threatened endemic labiates of Cyprus. Plant Spec Biol 25:77–84. https://doi.org/10.1111/j.1442-1984.2009.00265.x
Keeley JE, Bond WJ (1997) Convergent seed germination in South African fynbos and Californian chaparral. Plant Ecol 133:153–167. https://doi.org/10.1023/A:1009748603202
Leck MA, Parker VT, Simpson RL (2008) Seedling ecology and evolution. Cambridge University Press, Cambridge
Martinoli G (1950) Satureja thymbra L., elemento Mediterraneo-Orientale della Sardegna. Ital Bot [Inform Bot Ital] 56:576–592. https://doi.org/10.1080/11263505009431488
Mendoza I, Zamora R, Castro J (2009) A seeding experiment for testing tree-community recruitment under variable environments: implications for forest regeneration and conservation in Mediterranean habitats. Biol Conserv 142:1491–1499. https://doi.org/10.1016/j.biocon.2009.02.018
Moles AT, Westoby M (2004) What do seedlings die from and what are the implications for evolution of seed size? Oikos 106:193–199
Moreira B, Pausas JG (2018) Shedding light through the smoke on the germination of Mediterranean Basin flora. S Afr J Bot 115:244–250. https://doi.org/10.1016/j.sajb.2016.10.008
Moreira B, Tormo J, Estrelles E, Pausas J (2010) Disentangling the role of heat and smoke as germination cues in Mediterranean Basin flora. Ann Bot Lond 105:627–635. https://doi.org/10.1093/aob/mcq017
Navarro-Cano JA, Verdú M, García C, Goberna M (2015) What nurse shrubs can do for barren soils: rapid productivity shifts associated with a 40 years ontogenetic gradient. Plant Soil 388:197–209. https://doi.org/10.1007/s11104-014-2323-2
Pickering CM, Hill W (2007) Impacts of recreation and tourism on plant biodiversity and vegetation in protected areas in Australia. J Environ Manag 85:791–800. https://doi.org/10.1016/j.jenvman.2006.11.021
Pickering CM, Hill W, Newsome D, Leung YF (2010) Comparing hiking, mountain biking and horse-riding impacts on vegetation and soils in Australia and the United States of America. J Environ Manag 91:551–562. https://doi.org/10.1016/j.jenvman.2009.09.025
Pignatti S, Guarino R, La Rosa M (2017) Flora d’Italia, vol 4, 2nd edn. Edagricole—Edizioni Agricole di New Business Media, Bologna
Pinna MS, Cañadas EM, Bacchetta G (2014) Initial constraints in seedling dynamics of Juniperus macrocarpa Sm. Plant Ecol 215:853–861. https://doi.org/10.1007/s11258-014-0337-8
Pinna MS, Fenu G, Cogoni D, Bacchetta G (2015) Schede per una lista rossa della flora vascolare e crittogamica italiana Satureja thymbra L. Ital Bot [Inform Bot Ital] 47:245–289
Pisanu S, Farris E, Filigheddu R, García MB (2012) Demographic effects of large, introduced herbivores on a long-lived endemic plant. Plant Ecol 213:1543–1553. https://doi.org/10.1007/s11258-012-0110-9
Pouget M, Youssef S, Migliore J, Juin M, Médail F, Baumel A (2013) Phylogeography sheds light on the central–marginal hypothesis in a Mediterranean narrow endemic plant. Ann Bot Lond 112:1409–1420. https://doi.org/10.1093/aob/mct183
Pugnaire FI, Armas C, Maestre FT (2011) Positive plant interactions in the Iberian Southeast: mechanisms, environmental gradients, and ecosystem function. J Arid Environ 75:1310–1320. https://doi.org/10.1016/j.jaridenv.2011.01.016
Quézel P, Médail F (2017) Ecologie et biogéographie des forêts du bassin Méditerranéen, Editions scientifiques. Elsevier, Paris
Rey PJ, Alcántara J (2000) Recruitment dynamics of a fleshy fruited plant (Olea europaea): connecting patterns of seed dispersal to seedling establishment. J Ecol 88:622–633. https://doi.org/10.1046/j.1365-2745.2000.00472.x
Schenk HJ, Mahall BE (2002) Positive and negative plant interactions contribute to north–south–patterned association between two desert shrub species. Oecologia 132:402–410. https://doi.org/10.1007/s00442-002-0990-9
Sexton JP, McIntyre PJ, Angert AL, Rice KJ (2009) Evolution and ecology of species range limits. Annu Rev Ecol Evol Syst 40:415–436. https://doi.org/10.1146/annurev.ecolsys.110308.120317
Sulis E, Bacchetta G, Cogoni D, Fenu G (2017) Reproductive performance of Helianthemum caput-felis along its fragmented distribution in the Mediterranean coasts. Flora 234:24–33
Sulis E, Bacchetta G, Cogoni D, Fenu G (2018) Short-term population dynamics of Helianthemum caput-felis, a perennial Mediterranean coastal plant: a key element for an effective conservation program. Syst Biodivers 16:774–783. https://doi.org/10.1080/14772000.2018.1492469
Sulis E, Bacchetta G, Cogoni D, Gargano D, Fenu G (2020) Assessing the global conservation status of the rock rose Helianthemum caput-felis. Oryx 54:197–205. https://doi.org/10.1017/S0030605318001424
Thanos CA, Doussi MA (1995) Ecophysiology of seed germination in endemic labiates of Crete. Isr J Plant Sci 43:227–237
Thanos CA, Kadis CC, Skarou F (1995) Ecophysiology of germination in the aromatic plants thyme, savory and oregano (Labiatae). Seed Sci Res 5:161–170. https://doi.org/10.1017/S0960258500002786
Thompson JD (2005) Plant evolution in the Mediterranean. Oxford University Press, Oxford
Turkington R, Goldberg DE, Olsvig-Whittaker L, Dyer AR (2005) Effects of density on timing of emergence and its consequences for survival and growth in two communities of annual plants. J Arid Environ 61:377–396. https://doi.org/10.1016/j.jaridenv.2004.09.016
Weekley CW, Menges ES, Quintana-Ascencio PF (2007) Seedling emergence and survival of Warea carteri (Brassicaceae), an endangered annual herb of the Florida scrub. Can J Bot 85:621–628. https://doi.org/10.1139/B07-061
Widawski K, Jary Z (2019) Mass tourism in protected areas—underestimated threat? Polish National Parks case study. Open Geosci 11:1046–1060. https://doi.org/10.1515/geo-2019-0081
Yakimowski SB, Eckert CG (2007) Threatened peripheral populations in context: geographical variation in population frequency and size and sexual reproduction in a clonal woody shrub. Conserv Biol 21:811–822. https://doi.org/10.1111/j.1523-1739.2007.00684.x
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Pinna, M.S., Bacchetta, G., Cogoni, D. et al. Recruitment pattern in an isolated small population of the Mediterranean dwarf shrub Satureja thymbra L. and implication for conservation. Rend. Fis. Acc. Lincei 32, 205–213 (2021). https://doi.org/10.1007/s12210-021-00978-2
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DOI: https://doi.org/10.1007/s12210-021-00978-2