One species for one island? Unexpected diversity and weak connectivity in a widely distributed tropical hydrozoan
Bautisse Postaire
(1, 2, 3)
,
Pauline Gélin
(2, 1)
,
J. Henrich Bruggemann
(1, 2)
,
Hélène Magalon
(1, 2)
Bautisse Postaire
- Fonction : Auteur
- PersonId : 1242839
- IdHAL : bautisse-postaire
- ORCID : 0000-0001-8566-1040
Pauline Gélin
- Fonction : Auteur
- PersonId : 12164
- IdHAL : pauline-gelin
- IdRef : 200868861
J. Henrich Bruggemann
- Fonction : Auteur
- PersonId : 9775
- IdHAL : henrich-bruggemann
- IdRef : 124140343
Hélène Magalon
- Fonction : Auteur
- PersonId : 6926
- IdHAL : helene-magalon
- ORCID : 0000-0002-7061-955X
- IdRef : 087988151
Résumé
Isolation by distance (IBD) is one of the main modes of differentiation in marine species, above all in species presenting low dispersal capacities. This study reports the genetic structuring in the tropical hydrozoan Lytocarpia brevirostris a (sensu Postaire et al, 2016b), a brooding species, from 13 populations in the Western Indian Ocean (WIO) and one from New Caledonia (Tropical Southwestern Pacific). At the local scale, populations rely on asexual propagation at short distance, which was not found at larger scales; identical genotypes were restricted to single populations. After the removal of repeated genotypes, all populations presented significant positive F-IS values (between 0.094*** and 0.335***). Gene flow was extremely low at all spatial scales, between sites within islands (<10 km distance) and among islands (100 to411 000 km distance), with significant pairwise F-ST values (between 0.012*** and 0.560***). A general pattern of IBD was found at the Indo-Pacific scale, but also within sampled ecoregions of the WIO province. Clustering analyses identified each sampled island as an independent population, whereas analysis of molecular variance indicated that population genetic differentiation was significant at small (within island) and intermediate (among islands within province) spatial scales. The high population differentiation might reflect the life cycle of this brooding hydrozoan, possibly preventing regular dispersal at distances more than a few kilometres and probably leading to high cryptic diversity, each island housing an independent evolutionary lineage.
Format du dépôt | Notice |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
One species for one island? Unexpected diversity and weak connectivity in a widely distributed tropical hydrozoan
|
Résumé |
en
Isolation by distance (IBD) is one of the main modes of differentiation in marine species, above all in species presenting low dispersal capacities. This study reports the genetic structuring in the tropical hydrozoan Lytocarpia brevirostris a (sensu Postaire et al, 2016b), a brooding species, from 13 populations in the Western Indian Ocean (WIO) and one from New Caledonia (Tropical Southwestern Pacific). At the local scale, populations rely on asexual propagation at short distance, which was not found at larger scales; identical genotypes were restricted to single populations. After the removal of repeated genotypes, all populations presented significant positive F-IS values (between 0.094*** and 0.335***). Gene flow was extremely low at all spatial scales, between sites within islands (<10 km distance) and among islands (100 to411 000 km distance), with significant pairwise F-ST values (between 0.012*** and 0.560***). A general pattern of IBD was found at the Indo-Pacific scale, but also within sampled ecoregions of the WIO province. Clustering analyses identified each sampled island as an independent population, whereas analysis of molecular variance indicated that population genetic differentiation was significant at small (within island) and intermediate (among islands within province) spatial scales. The high population differentiation might reflect the life cycle of this brooding hydrozoan, possibly preventing regular dispersal at distances more than a few kilometres and probably leading to high cryptic diversity, each island housing an independent evolutionary lineage.
|
Auteur(s) |
Bautisse Postaire
1, 2, 3
, Pauline Gélin
2, 1
, J. Henrich Bruggemann
1, 2
, Hélène Magalon
1, 2
1
ENTROPIE [Réunion] -
Ecologie marine tropicale dans les Océans Pacifique et Indien
( 418794 )
- UNIVERSITE DE LA REUNION
Faculté des Sciences et Technolo
15 Avenue René Casin
BP 92003
97744 ST DENIS CEDEX 9
- France
2
LabEX CORAIL -
Laboratoire d'Excellence CORAIL
( 209113 )
- 58 avenue Paul Alduy 66860 Perpignan CEDEX - Tél. : 04 30 19 23 32 - contact@labex-corail.fr
- France
3
IMBE -
Institut méditerranéen de biodiversité et d'écologie marine et continentale
( 188653 )
- Aix Marseille Université, Campus Etoile, Faculté St-Jérôme case 421 Av. . escadrille Normandie-Niemen 13397 MARSEILLE CEDEX 20
- France
|
Langue du document |
Anglais
|
Nom de la revue |
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Date de publication |
2017
|
Volume |
118
|
Numéro |
4
|
Page/Identifiant |
385-394
|
Domaine(s) |
|
DOI | 10.1038/hdy.2016.126 |
Base Horizon | fdi:010069434 |
PubMed Central | PMC5345608 |
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