A molecular phylogeny of the spiny lobster Panulirus homarus highlights a separately evolving lineage from the Southwest Indian Ocean

PeerJ

article

Sohana P. Singh¹  Johan C. Groeneveld¹  Abdulaziz Al-Marzouqi³  Sandi Willows-Munro² 

[1] Oceanographic Research Institute;School of Life Sciences, University of KwaZulu-Natal;Marine Science and Fisheries Centre, Ministry of Agriculture and Fisheries

关键词: Decapoda;    Spiny lobster;    Phylogeny;    Species concept;    Coalescence;    Divergence dating;   

DOI  :  10.7717/peerj.3356

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Accurate species description in the marine environment is critical for estimating biodiversity and identifying genetically distinct stocks. Analysis of molecular data can potentially improve species delimitations because they are easily generated and independent, and yield consistent results with high statistical power. We used classical phylogenetic (maximum likelihood and Bayesian inference) and coalescent-based methods (divergence dating with fossil calibrations and coalescent-based species delimitation) to resolve the phylogeny of the spiny lobster Panulirus homarus subspecies complex in the Indo-West Pacific. Analyses of mitochondrial data and combined nuclear and mitochondrial data recovered Panulirus homarus homarus and Panulirus homarus rubellus as separately evolving lineages, while the nuclear data trees were unresolved. Divergence dating analysis also identified Panulirus homarus homarus and Panulirus homarus rubellus as two distinct clades which diverged from a common ancestor during the Oligocene, approximately 26 million years ago. Species delimitation using coalescent-based methods corroborated these findings. A long pelagic larval life stage and the influence of ocean currents on post-larval settlement patterns suggest that a parapatric mode of speciation drives evolution in this subspecies complex. In combination, the results indicate that Panulirus homarus rubellus from the Southwest Indian Ocean is a separately evolving lineage and possibly a separate species.

【 授权许可】

CC BY