Adaptive radiation in the Hawaiian Silversword Alliance (Compositae-Madiinae). I. Cytogenetics of spontaneous hybrids

Author:

Carr, Gerald D., Kyhos, Donald W.

Title:

Adaptive radiation in the Hawaiian Silversword Alliance (Compositae-Madiinae). I. Cytogenetics of spontaneous hybrids

Periodical:

Evolution

Year:

1981

Volume:

35

Pages:

543-556

Subject:

Silverswords Argyroxiphium sandwicense Dubautia Adaptive radiation (Evolution)

Summary:

Field observations of the Hawaiian silversword alliance indicate that hybridization between species is very common and that the number of hybrids produced at a given site is likely to be highest in instances where internal isolation is lowest. Apparent interspecific recombinants are frequent at sites of sympatry involving species with little or no internal isolation and the potential for gene flow even between well-marked genera has been retained. Thus, even among members of the Hawaiian silversword alliance that possess chromosomal isolation, hybridization has very likely been an important mechanism for the generation of recombinants capable of exploiting the myriad of highly diversified, yet closely spaced habitats in the Hawaiian environment. There can be little doubt that hybridization has been at least equally important in other Hawaiian groups where except for the extremely low incidence of polyploidy, significant internal isolation is unreported.

Label:

Silverswords

URL:

http://cletus.uhh.hawaii.edu:2075/stable/2408201

Date:

1981

Collection:

Periodicals