Molecular Phylogenetics of Gobiid Fishes

Molecular phylogenetics has transformed the understanding of gobiid diversification by leveraging DNA sequence data to reconstruct evolutionary relationships within one of the most speciose vertebrate families. Initial studies employing single mitochondrial markers such as cytochrome b and cytochrome c oxidase I unveiled deep divergences among subfamilies and challenged traditional morphology-based classifications. The advent of high-throughput sequencing facilitated generation of complete mitochondrial genomes alongside multi-locus nuclear datasets, greatly enhancing resolution of both recent radiations and ancient splits. These data have pinpointed Miocene-era invasions of freshwater habitats, revealed Gondwanan vicariance events underlying trans-oceanic sister-group pairs of cave-adapted gobiids, and documented multiple independent transitions into specialised niches such as interstitial gravel beds and subterranean karst systems. By integrating molecular clocks with fossil calibration points derived from otolith-bearing specimens, researchers have refined divergence-time estimates for key lineages. More recently, total-evidence frameworks combining genetic and morphological characters now allow living and extinct taxa to be placed within a unified phylogeny. This comprehensive approach has clarified lineage boundaries, illuminated patterns of adaptive radiation across marine, brackish and freshwater realms, and informed conservation strategies for invasive species while deepening insights into the evolutionary processes driving gobiid ecological and biogeographical diversity.

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Molecular Phylogenetics of Gobiid Fishes publication trend

The graph below shows the total number of articles in molecular phylogenetics of gobiid fishes across all publications each year (not limited to Nature Index journals).

Technical terms

Molecular phylogenetics: The study of evolutionary relationships by comparing DNA or protein sequences among organisms.

Mitochondrial genome (mitogenome): The circular DNA molecule found in mitochondria, often used as a marker for inferring phylogeny due to its high mutation rate and maternal inheritance.

Total-evidence framework: A phylogenetic approach that integrates molecular data and morphological characters, including fossil traits, into a single analysis to infer evolutionary relationships.

Fossil calibration: The process of using dated fossil occurrences to constrain molecular clock estimates of divergence times within a phylogenetic tree.

References

1. The mitochondrial genome sequences of the round goby and the sand goby reveal patterns of recent evolution in gobiid fish. BMC Genomics (2017).
2. Otoliths in situ from Sarmatian (Middle Miocene) fishes of the Paratethys. Part III: tales from the cradle of the Ponto-Caspian gobies. Swiss Journal of Palaeontology (2016).
3. Adaptive radiation of gobies in the interstitial habitats of gravel beaches accompanied by body elongation and excessive vertebral segmentation. BMC Ecology and Evolution (2009).
4. The First Record of a Trans-Oceanic Sister-Group Relationship between Obligate Vertebrate Troglobites. PLOS ONE (2012).
5. Freshwater gobies 30 million years ago: New insights into character evolution and phylogenetic relationships of †Pirskeniidae (Gobioidei, Teleostei). PLOS ONE (2020).
6. The lost freshwater goby fish fauna (Teleostei, Gobiidae) from the early Miocene of Klinci (Serbia). Swiss Journal of Palaeontology (2019).
7. An integrative phylogenetic approach for inferring relationships of fossil gobioids (Teleostei: Gobiiformes). PLOS ONE (2022).