Publications by authors named "Stephanie J Bradbeer"
Invasive alien species negatively impact upon biodiversity and generate significant economic costs worldwide. Globally, amphibians have suffered considerable losses, with a key driver being predation by large invasive invertebrate and vertebrate predators. However, there is no research regarding the potential ecological impact of small invertebrate invaders.
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- Invasive Nile tilapia are hybridizing with native Korogwe tilapia in southern Tanzania, threatening unique genetic resources.
- Research shows that southern Korogwe tilapia populations are genetically distinct from those in northern Tanzania, having diverged around 140,000 years ago.
- Findings indicate the need for conservation efforts to protect these unique and vulnerable fish populations from hybridization and genetic dilution.
Biosecurity protocols designed to prevent the spread of invasive alien species (IAS) are now an essential aspect of IAS management. However, the effectiveness of various biosecurity treatments requires further exploration. Killer shrimp, Dikerogammarus villosus, a notoriously high impact and ecosystem destabilising invader, has rapidly spread across Europe, and is of concern to invade Northern America.
View Article and Find Full Text PDFHybridization between introduced and indigenous species can lead to loss of unique genetic resources and precipitate extinction. In Tanzania, the Nile tilapia () and blue-spotted tilapia () have been widely introduced to non-native habitats for aquaculture and development of capture fisheries. Here, we aimed to quantify interspecific hybridization between these introduced species and the indigenous species , and .
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- From the 1950s, East Africa has implemented aquaculture and fisheries programs focused on introduced species, though documentation in Tanzania has been lacking.
- A study conducted between 2011 and 2017 identified tilapia species across 123 locations, revealing 14 native taxa and three species, including one exotic (blue-spotted tilapia) that have expanded their range.
- Habitat modeling suggests that suitable conditions for these introduced species will persist and possibly expand due to changing climate projections, aiding in biodiversity management and informing future policies on aquaculture.
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- Hybridization between invasive tilapia species and indigenous Wami tilapia in Tanzania poses significant genetic and morphological risks, as indicated by studies conducted at Mindu Reservoir and Kidatu.
- The research utilized genetic screening and morphological assessments and found hybrids displaying a diverse range of physical traits that overlap with both parent species.
- The findings suggest that the introduction of invasive tilapia has greatly affected the gene pool and traits of indigenous tilapia populations, leading to recommendations for caution in further invasive species introductions, especially when no clear benefits exist.