New insights from fine‐scale spatial genetic structure analyses in plant populations

Vekemans, Xavier; Hardy, Olivier J.

doi:10.1046/j.1365-294x.2004.02076.x

Cited by 1,124 publications

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“…This is the most common pattern found in plants (Ashley 2010), and our observations are also consistent with the pattern frequently reported for insect‐pollinated species (Austerlitz et al. 2004; Smouse and Sork 2004; Vekemans and Hardy 2004). But in H. oldfieldii , most pollen movements were not to nearest neighbors but to plants >10 m away, including significant pollination from distant (>50 m away) sources.…”

Section: Discussionmentioning

confidence: 99%

Limiting inbreeding in disjunct and isolated populations of a woody shrub

Sampson

Byrne

Gibson

et al. 2016

Ecology and Evolution

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Pollen movements and mating patterns are key features that influence population genetic structure. When gene flow is low, small populations are prone to increased genetic drift and inbreeding, but naturally disjunct species may have features that reduce inbreeding and contribute to their persistence despite genetic isolation. Using microsatellite loci, we investigated outcrossing levels, family mating parameters, pollen dispersal, and spatial genetic structure in three populations of Hakea oldfieldii, a fire‐sensitive shrub with naturally disjunct, isolated populations prone to reduction in size and extinction following fires. We mapped and genotyped a sample of 102 plants from a large population, and all plants from two smaller populations (28 and 20 individuals), and genotyped 158–210 progeny from each population. We found high outcrossing despite the possibility of geitonogamous pollination, small amounts of biparental inbreeding, a limited number of successful pollen parents within populations, and significant correlated paternity. The number of pollen parents for each seed parent was moderate. There was low but significant spatial genetic structure up to 10 m around plants, but the majority of successful pollen came from outside this area including substantial proportions from distant plants within populations. Seed production varied among seven populations investigated but was not correlated with census population size. We suggest there may be a mechanism to prevent self‐pollination in H. oldfieldii and that high outcrossing and pollen dispersal within populations would promote genetic diversity among the relatively small amount of seed stored in the canopy. These features of the mating system would contribute to the persistence of genetically isolated populations prone to fluctuations in size.

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Section: Discussionmentioning

confidence: 99%

Limiting inbreeding in disjunct and isolated populations of a woody shrub

Sampson

Byrne

Gibson

et al. 2016

Ecology and Evolution

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“…excluding the population from the island of Mallorca) and for each lineage and the hybrid zone separately. Regression was performed for the kinship coefficient between pairs of individuals (fij) (Loiselle et al, 1995) and their geographical distance (dij), to give a regression slope lnbd and its statistical significance (Vekemans & Hardy, 2004). Also, spatial autocorrelation methods were applied to examine spatial genetic structure (Smouse & Peakall, 1999).…”

Section: Statistical Analysesmentioning

confidence: 99%

Spatial genetic structure across a hybrid zone between European rabbit subspecies

Alda

Doadrio

2014

Preprint

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View the peer-reviewed version (peerj.com/articles/582), which is the preferred citable publication unless you specifically need to cite this preprint.Alda F, Doadrio I. 2014. Spatial genetic structure across a hybrid zone between European rabbit subspecies. PeerJ 2:e582 https://doi.org/10.7717/peerj.582 S p a t i a l g e n e t i c s t r u c t u r e a c r o s s a h y b r i d z o n e b e t we e n E u r o p e a n r a b b i t s u b s p e c i e sT h e I b e r i a n P e n i n s u l a i s t h e o n l y r e g i o n i n t h e wo r l d wh e r e t h e t wo e x i s t i n g s u b s p e c i e s o f t h e E u r o p e a n r a b b i t ( Or y c t o l a g u s c u n i c u l u s ) n a t u r a l l y o c c u r a n d h y b r i d i z e . I n t h i s s t u d y we e x p l o r e t h e r e l a t i v e r o l e s o f h i s t o r i c a l a n d c o n t e mp o r a r y p r o c e s s e s i n s h a p i n g t h e s p a t i a l g e n e t i c s t r u c t u r e o f t h e r a b b i t a c r o s s i t s n a t i v e d i s t r i b u t i o n r a n g e , a n d h o w t h e y d i ff e r e n t l y a ff e c t e a c h s u b s p e c i e s a n d t h e h y b r i d z o n e . F o r t h a t p u r p o s e mu l t i l o c u s g e n o t y p e s a n d mi t o c h o n d r i a l DNA d a t a we r e o b t a i n e d f o r 7 7 1 r a b b i t s a c r o s s mo s t o f t h e s p e c i e s ' d i s t r i b u t i o n r a n g e i n S p a i n . Nu c l e a r ma r k e r s d e fi n e d a h i e r a r c h i c a l g e n e t i c s t r u c t u r e fi r s t l y c o mp r i s e d b y t wo g e n e t i c g r o u p s , l a r g e l y c o n g r u e n t wi t h t h e mi t o c h o n d r i a l l i n e a g e s a n d s u b s p e c i e s d i s t r i b u t i o n s ( O. c . a l g i r u s a n d O. c . c u n i c u l u s ) , wh i c h we r e s u b s e q u e n t l y s u b d i v i d e d i n t os e v e n g e n e t i c g r o u p s p r o b a b l y s h a p e d b y e n v i r o n me n t a l o r e c o l o g i c a l f a c t o r s . Ge o g r a p h i c d i s t a n c e a l o n e e me r g e d a s a n i mp o r t a n t f a c t o r e x p l a i n i n g g e n e t i c d i ff e r e n t i a t i o n a c r o s s t h e wh o l e r a n g e , wi t h o u t t h e n e e d t o i n v o k e f o r t h e e ff e c t f o r g e o g r a p h i c a l b a r r i e r s . T h u s , wh e n c o n s i d e r i n g t h e o v e r a l l g e n e t i c s t r u c t u r e , d i ff e r e n c e s a t a l o c a l l e v e l s e e m t o b e o f g r e a t e r i mp o r t a n c e . T h e s i g n i fi c a n t l y p o s i t i v e s p a t i a l c o r r e l a t i o n u p t o a d i s t a n c e o f o n l y 1 0 0 k m s u p p o r t e d t h i s h y p o t h e s i s . Ho we v e r , n o r t h e r n p o p u l a t i o n s o f O. c . c u n i c u l u s s h o we d mo r e s p a t i a l g e n e t i c s t r u c t u r e a n d d i ff e r e n t i a t i o n t h a n O. c . a l g i r u s , wh i c h c o u l d b e d u e t o l o c a l g e o g r a p h i c b a r r i e r s , l i mi t e d r e s o u r c e s , s o i l t y p e a n d / o r s o c i a l b e h a v i o u r s l i mi t i n g d i s p e r s a l .T h e h y b r...

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“…Studies have shown that taxa with high dispersal capabilities maintain high levels of gene flow and express low levels of geographic structuring due to the homogenization of genetic diversity (Grant & Bowen, 1998; Beheregaray & Sunnucks, 2001; Manel, Schwartz, Luikart, & Taberlet, 2003; Gotoh, Chiba, Goto, Tamate, & Hanzawa, 2011; Manel & Holderegger, 2013). However, reduced dispersal capabilities minimize the amount of gene flow between populations, which may result in a nonrandom distribution of alleles (Templeton, Routman, & Phillips, 1995; Avise, 2000; Hanski, Erälahti, Kankare, Ovaskainen, & Sirén, 2004; Vekemans & Hardy, 2004). …”

Section: Introductionmentioning

confidence: 99%

Insight into the population structure of hardhead silverside,Atherinomorus stipes(Teleostei: Atherinidae), in Belize and the Florida Keys usingnd2

Nash

Kraczkowski

Chernoff

2017

Ecology and Evolution

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Little is known about the natural history, biology, and population genetic structure of the Hardhead Silverside, Atherinomorus stipes, a small schooling fish found around islands throughout the Caribbean. Our field observations of A. stipes in the cays of Belize and the Florida Keys found that populations tend to be in close association with the shoreline in mangrove habitats. Due to this potential island‐based population structuring, A. stipes represents an ideal system to examine questions about gene flow and isolation by distance at different geographic scales. For this study, the mitochondrial gene nd2 was amplified from 394 individuals collected from seven different Belizean Cays (N = 175) and eight different Floridian Keys (N = 219). Results show surprisingly high haplotype diversity both within and between island‐groups, as well as a high prevalence of unique haplotypes within each island population. The results are consistent with models that require gene flow among populations as well as in situ evolution of rare haplotypes. There was no evidence for an isolation by distance model. The nd2 gene tree consists of two well‐supported monophyletic groups: a Belizean‐type clade and a Floridian‐type clade, indicating potential species‐level differentiation.

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New insights from fine‐scale spatial genetic structure analyses in plant populations

Cited by 1,124 publications

References 81 publications

Limiting inbreeding in disjunct and isolated populations of a woody shrub

Limiting inbreeding in disjunct and isolated populations of a woody shrub

Spatial genetic structure across a hybrid zone between European rabbit subspecies

Insight into the population structure of hardhead silverside,Atherinomorus stipes(Teleostei: Atherinidae), in Belize and the Florida Keys usingnd2

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