Evidence for Long Isolation Among Populations of a Pacific Cycad: Genetic Diversity and Differentiation in Cycas seemannii A.Br. (Cycadaceae) | Zendy

Gunnar Keppel | Zendy; S-W Lee | Zendy; Paul D. Hodgskiss | Zendy

Open Access

Evidence for Long Isolation Among Populations of a Pacific Cycad: Genetic Diversity and Differentiation in Cycas seemannii A.Br. (Cycadaceae)

Author(s) -

Gunnar Keppel,

S-W Lee,

Paul D. Hodgskiss

Publication year - 2002

Publication title -

journal of heredity

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.99

H-Index - 92

eISSN - 1471-8505

pISSN - 0022-1503

DOI - 10.1093/jhered/93.2.133

Subject(s) - biology , genetic diversity , gene flow , inbreeding , cycad , isolation by distance , abundance (ecology) , genetic drift , genetic structure , evolutionary biology , ecology , range (aeronautics) , zoology , genetic distance , genetic variation , population , genetics , gene , demography , materials science , sociology , composite material

The genetic structure of Cycas seemannii A.Br. (Cycadaceae), sampled throughout its range in Vanuatu, New Caledonia, Fiji, and Tonga, was studied using starch-gel electrophoresis. Twenty enzyme loci in 13 enzyme systems were examined. Low genetic diversity within populations (A = 1.2, P = 21.3, Ho = 0.047, and He = 0.057) and a high degree of differentiation among populations (F(ST) = 0.594) were found. This, together with low gene flow estimates, suggests genetic drift by isolation to have been most critical to the current genetic structure of the species. Inbreeding may occur to some extent (F(IS) = 0.165). The decline in abundance of C. seemannii, coupled with the low level of genetic diversity, suggest that conservation strategies are urgently needed.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research