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2015 | 84 | 3 |

Tytuł artykułu

Strong potential for endozoochory by waterfowl in a rare, ephemeral wetland plant species, Astragalus contortuplicatus (Fabaceae)

Treść / Zawartość

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
It was proposed previously that passive dispersal by migratory aquatic birds explain the widespread distribution of many wetland organisms. Several experimental studies have shown that many widespread wetland plant species can be readily dispersed within the guts of Anatidae. However, it is unclear whether plants with a more restricted distribution are able to disperse via waterbirds. This paper addresses the dispersal ability and germination ecology of the little-known Hungarian milkvetch Astragalus contortuplicatus, which occurs on banks of continental rivers and has a limited and unpredictable distribution. To test whether limited capacity for endozoochory by waterfowl could explain the sporadic appearance of this species, we force-fed ten captive mallards (Anas platyrhynchos) with 100 milkvetch seeds each. Droppings were collected for up to 45 h after feeding. Intact and viable seeds were found in the droppings of each mallard, and altogether 24.7% of seeds fed were recovered intact. The proportion of retrieved seeds that germinated (27.0%) was significantly higher than that of untreated control seeds (0.5%), but significantly lower than that of mechanically scarified seeds (96.0%). Retrieved seeds that germinated developed into healthy mature plants. Given the average flight velocity of mallards, seeds of A. contortuplicatus may travel up to 1600 km inside the digestive tract of migrating individuals. Our results suggest that avian vectors may be more important for the dispersal of rare higher plants (especially those with a hard seed-coat) than hitherto considered. Moreover, they suggest that rarity does not necessarily indicate limited dispersal ability, and may instead be explained by specific habitat requirements.

Wydawca

-

Rocznik

Tom

84

Numer

3

Opis fizyczny

p.321-326,fig.,ref.

Twórcy

  • Department of Botany, Unversity of Debrecen, Egyetem ter 1, Debrecen 4032, Hungary
autor
  • Department of Ecology, University of Debrecen, Egyetem ter 1, Debrecen 4032, Hungary
autor
  • MTA-DE "Lendulet" Behavioral Ecology Research Group, Department of Evolutionary Zoology and Human Biology, University of Debrecen, Egyetem ter 1, Debrecen 4032, Hungary
autor
  • Department of Wetland Ecology, Estacion Biologica de Donana, EBD-CSIC, Avenida Americo Vespucio s/n, 41092 Sevilla, Spain
autor
  • Department of Botany, Unversity of Debrecen, Egyetem ter 1, Debrecen 4032, Hungary
autor
  • Department of Botany, Unversity of Debrecen, Egyetem ter 1, Debrecen 4032, Hungary

Bibliografia

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Typ dokumentu

Bibliografia

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Identyfikator YADDA

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