Narrowly (neo)endemic species often attract special attention in conservation contexts, because their restricted distributions render them more vulnerable than most widespread species. However, little attention is given to the question whether time since speciation is the (only) factor responsible for the narrow ranges of neoendemics, or if biological or ecological factors are (also) involved. The Southeast Asian orchid genus Sirindhornia comprises three terrestrial species. In Thailand, we compared demographic and reproductive characteristics between the local endemics S. mirabilis and S. pulchella and the widespread S. monophylla. The three species had similar demographic characteristics, but different reproductive attributes. In most contexts where they differed, the local endemics were more reproductively restricted than the widespread S. monophylla. Thus, the latter exhibited higher relative fruit set, higher seed production per inflorescence and more equal individual contributions of progeny. However, recruitment appeared to be more efficient in S. pulchella than in the other two species.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 47 • No. 6