Andrew Ndhlovu

Stellenbosch University | SUN · Department of Botany and Zoology

Understanding the drivers of organic carbon (Corg) stock variability is key to improving the accuracy of seagrass blue carbon assessments and emphasizing their role as nature-based solutions to mitigate climate change. Using sediment coring (15 cm depth), we investigated Corg variability at fine spatial scales (< 110 m) and large spatial scales (~1...

Cape dwarf eelgrass Zostera capensis is the most abundant seagrass in South Africa, with some isolated populations occurring along the East African coastline. Providing numerous ecosystem services that support biodiversity and human wellbeing, it is endangered throughout its distribution. As such, the long-term persistence of Z. capensis is uncerta...

Background Seagrass and salt marsh ecosystems are recognised for their role in climate change mitigation and adaptation given their carbon storage potential. However, factors driving variability in blue carbon ecosystems are understudied, yet are important to account for. Aims Examine the variability of sediment organic carbon (SOC) and its driver...

Environmental DNA (eDNA) metabarcoding is a promising tool for monitoring marine biodiversity, but remains underutilised in Africa. In this study, we evaluated the ability of aquatic eDNA metabarcoding as a tool for detecting biodiversity associated with a South African kelp forest, an ecosystem that harbours high diversity of species, many of whic...

Environmental DNA metabarcoding is a powerful tool for monitoring marine biodiversity, yet several outstanding questions remain regarding the persistence of eDNA. In this study, we use fine-scale spatial (1 m, 8 m) and temporal sampling (every four hours for 24 hours), in combination with metabarcoding to test the effect of depth and time on commun...

Seagrasses are important marine ecosystem engineers but anthropogenic impacts and climate change have led to numerous population declines globally. In South Africa, Zostera capensis is endangered due to fragmented populations and heavy anthropogenic pressures on estuarine ecosystems that house the core of the populations. Addressing questions of ho...

The discovery of caspase homologs in bacteria highlighted the relationship between programmed cell death (PCD) evolution and eukaryogenesis. However, the origin of PCD genes in prokaryotes themselves (bacteria and archaea) is poorly understood and a source of controversy. Whether archaea also contain C14 peptidase enzymes and other death domains is...

Programmed cell death (PCD) in unicellular organisms is in some instances an altruistic trait. When the beneficiaries are clones or close kin, kin selection theory may be used to explain the evolution of the trait, and when the trait evolves in groups of distantly related individuals, group or multilevel selection theory is invoked. In mixed microb...

A non-toxic red tide with resulting anoxia was the cause of a major harmful algal bloom in St Helena Bay, South Africa, in February and March 2015. The red tide was observed along approximately 200 km of the Namaqua coastline extending well north of the Olifants River and southward into the bay. A maximum cell concentration of 14.32 × 10⁶ cells l⁻¹...

The H3ABioNet pan-African bioinformatics network, which is funded to support the Human Heredity and Health in Africa (H3Africa) program, has developed node-assessment exercises to gauge the ability of its participating research and service groups to analyze typical genome-wide datasets being generated by H3Africa research groups. We describe a fram...

Selective pressures at the DNA level shape genes into profiles consisting of patterns of rapidly evolving sites and sites withstanding change. These profiles remain detectable even when protein sequences become extensively diverged. A common task in molecular biology is to infer functional, structural or evolutionary relationships by querying a dat...

The evolutionary rate at codon sites across protein-coding nucleotide sequences represents a valuable tier of information for aligning sequences, inferring homology and constructing phylogenetic profiles. However, a comprehensive resource for cataloguing the evolutionary rate at codon sites and their corresponding nucleotide and protein domain sequ...