Phylogenomics of the critically endangered Harttiella (Siluriformes, Loricariidae) based on complete mitochondrial genomes

Ichthyological Research, Journal Year: 2025, Volume and Issue: unknown

Published: May 7, 2025

Abstract The genus Harttiella , belonging to the armoured catfish family Loricariidae subfamily Loricariinae (Siluriformes), comprises species with narrow geographical ranges, predominantly endemic river basins in French Guiana and Suriname. Despite recent taxonomic advancements, including description of new species, faces conservation challenges due its rarity, limited dispersal capacities, habitat fragmentation. To elucidate evolutionary history aid efforts, we sequenced complete mitochondrial genomes for all known species. Our analysis revealed distinctive molecular features, unique stop codon usage positioning, potentially serving as synapomorphies genus. Phylogenetic reconstructions supported previous findings highlighted complex relationships within Furthermore, our study provides foundational genomic resources developing targeted environmental DNA approaches monitor conserve populations effectively. These contribute a comprehensive understanding evolution inform strategies aimed at preserving this group freshwater fish.

Language: Английский

Evaluating the eDNA spatial signal in natural populations and its application for the monitoring of the threatened Harttiella (Siluriformes, Loricariidae)

Limnology and Oceanography Methods, Journal Year: 2024, Volume and Issue: 22(9), P. 660 - 669

Published: July 3, 2024

Abstract To face the current downward trajectory of freshwater biodiversity loss, implementation effective monitoring programs is utmost importance. Environmental DNA offers unprecedented opportunities for this aim but several challenges still need to be addressed before implementing efficient species using eDNA. One them optimizing eDNA sampling scheme maximize detection probability. For instance, in flowing freshwaters, transport downstream from its source can impact probability, and blur link between local occurrence species. Here, we investigated spatial range Harttiella lucifer (Siluriformes, Loricariidae), a threatened neotropical siluriform fish inhabiting French Guianese mountain streams, confined waterfalls fast‐flowing environments. samples were collected at 11 sites H. population 2000 m downstream. A species‐specific dPCR approach was applied quantify amount present each sample evaluate probability according distance source. Results showed an accumulation 50 100 population. The evaluation probabilities revealed that 300 population, drops 50%. This study suggests drift small streams limited few tens meters These findings demonstrate provides picture fauna rather than integrating information over large scales.

Language: Английский

Genomic resources for the monitoring and management of Tometes trilobatus, Hoplias aimara and Myloplus rhomboidalis, three exploited freshwater fish species in French Guiana

Knowledge and Management of Aquatic Ecosystems, Journal Year: 2024, Volume and Issue: 425, P. 17 - 17

Published: Jan. 1, 2024

The Neotropical region, hosts a quarter of all freshwater fish species, while providing important food resources for local human populations. management neotropical ecosystems is thus primary importance both biodiversity conservation and sustainability. Recent technological advances in the field genomics offer new tools managers practitioners to monitor entire assemblages using environmental DNA (eDNA) metabarcoding, or detect specific species populations targeted eDNA. availability information crucial implement eDNA monitoring methods. Nevertheless, primers allowing species-centred approaches are lacking most species. In French Guiana, only 18 mitochondrial genomes fishes have been published out more than 400 known from Guiana. this study, we provide genomic Myloplus rhomboidalis (locally called Koumarou), Hoplias aimara (Aimara) Tometes trilobatus (Pakou), three exploited We complete detection by developing approach digital PCR (dPCR) each

Language: Английский