Pollinator limitation affects low reproductive success in populations of nectarless orchid in the Biebrza National Park

Warianty tytułu

PL

Deficyt zapylaczy przyczyną niskiego sukcesu reprodukcyjnego w populacjach nienektarycznego storczyka w Biebrzańskim Parku Narodowym

• Języki publikacji: EN

Abstrakty

EN

The deficiency of pollinators is indicated as the main factor limiting fruit set in orchids. Nectariferous species are more successful in setting fruits than nectarless species. In the present study, we tested whether pollinator limitation lowers reproductive success in populations of Cypripedium calceolus on environmental islands in the Biebrza National Park, NE Poland. Moreover, we analyzed how population size and structure affect pollination success. Our observations and results of experiments document the low level of fruiting in populations of nectarless C. calceolus (9.2% on average) and strong pollen limitation. Generally, we noted a positive relationship between pollination success and all parameters of population size (measured by both occupied area and number of clumps or shoots) and parameters measuring floral display (number of flowers in population, number of flowers in clumps, spatial structure of flowering shoots). We suggest that information about factors influencing the reproductive success of this endangered species may be useful for planning appropriate conservation actions.

PL

Jedną z głównych przyczyn niskiego poziomu owocowania u storczyków jest deficyt zapylaczy. Generalnie, storczyki nektaryczne charakteryzują się niższym owocowaniem niż nienektaryczne. Celem badań było sprawdzenie czy niski sukces reprodukcyjny w populacjach Cypripedium calceolus na wyspach mineralnych w Biebrzańskim Parku Narodowym spowodowany jest niedostatkiem zapylaczy. Ponadto, analizowano wpływ wielkości i struktury populacji tego gatunku na sukces zapyleniowy. Obserwacje i wyniki eksperymentów dokumentują niski poziom owocowania w populacjach C. calceolus (średnio 9.2%) oraz limitację pyłkiem. Odnotowano pozytywne zależności między sukcesem zapyleniowym a badanymi wskaźnikami wielkości populacji (mierzonymi zarówno wielkością zajmowanego areału, jak też liczbą kęp i pędów) oraz wielkością wystawy kwiatowej (liczba kwiatów w populacji, liczba kwiatów/ kępę, rozmieszczenie pędów kwitnących). Znajomość czynników wpływających na sukces reprodukcyjny zagrożonego gatunku jest bardzo istotna w planowaniu odpowiednich działań konserwatorskich.

• Wydawca: -
• Czasopismo: Acta Agrobotanica
• Rocznik: 2017
• Tom: 70
• Numer: 1
• Opis fizyczny: Article 1706 [10p.], fig.,ref.

Twórcy

Bibliografia

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Identyfikatory

DOI

10.5586/aa.1706