مورد إلكتروني
Effects of population size, density and local environment on the population dynamics of the fragrant orchid (Gymnadenia conopsea)
العنوان: | Effects of population size, density and local environment on the population dynamics of the fragrant orchid (Gymnadenia conopsea) |
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بيانات النشر: | Uppsala universitet, Institutionen för biologisk grundutbildning 2021 |
تفاصيل مُضافة: | Kupka, Kasper |
نوع الوثيقة: | Electronic Resource |
مستخلص: | A wide majority of orchid populations are decreasing due to habitat fragmentation and to changes in land management. Population size, density and habitat quality are factors that are expected to be positively related to the viability and future growth of a population. We evaluated if population size, density and soil organic matter were good predictors of growth, survival, flowering, recruitment, and growth rate in 18 populations of the long-lived orchid Gymnadenia conopsea. We followed the populations for four years. Recruitment in 2020 increased with population size, and survival in 2018 was higher in denser populations. However, flowering probability and number of flowers both decreased with population size in 2018. Soil organic matter did not significantly influence any vital rate. In total, the studied population factors could explain very little of the variation in demography. The matrix modelling showed that 14 of the 18 populations had a positive stochastic growth rate, even with an increased probability of summer drought (scenario with 50% of the years equal to the dry summer of 2018). In the populations with negative growth rate, the probability of quasi-extinction in the next 50 years varied from 90 to 100%. Declining populations were characterized by low survival following the dry year. In sum, population size, density and soil organic matter did not convincingly explain variation in growth rate of G. conopsea, suggesting that other environmental factors are responsible of governing variation in vitals rates and population dynamics. |
مصطلحات الفهرس: | Demography, Gymnadenia conopsea, local habitat, matrix models, orchids, population density, population size, stochastic growth rate, soil organic matter, quasi-extinction probability, Ecology, Ekologi, Student thesis, info:eu-repo/semantics/bachelorThesis, text |
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الإتاحة: | Open access content. Open access content info:eu-repo/semantics/openAccess |
ملاحظة: | application/pdf English |
أرقام أخرى: | UPE oai:DiVA.org:uu-447703 1293974888 |
المصدر المساهم: | UPPSALA UNIV LIBR From OAIster®, provided by the OCLC Cooperative. |
رقم الأكسشن: | edsoai.on1293974888 |
قاعدة البيانات: | OAIster |
الوصف غير متاح. |