The Quiet Crisis

Harrison, Ian; Stiassny, Melanie L. J.

doi:10.1007/978-1-4757-5202-1_12

Cited by 83 publications

(6 citation statements)

References 67 publications

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“…Meaningful conservation efforts, at the minimum, require knowledge on the diversity, distribution and habitat requirements of species. However, data on freshwater biodiversity is poor, so that undetected species extinctions are common, particularly for invertebrate taxa and in tropical habitats (Harrison and Stiassny, 1999;Dudgeon et al, 2006). At the same time, available data indicate that freshwater species-richness and levels of endemism peak in the tropics (Dudgeon et al, 2006 and references therein).…”

Section: Introductionmentioning

confidence: 99%

Changes and drivers of freshwater mussel diversity and distribution in northern Borneo

Zieritz

Bogan

Rahim

et al. 2018

Biological Conservation

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Human activities are threatening Borneo's unique biodiversity, but little is known on the status of freshwater invertebrates. We assessed changes in diversity and distribution of freshwater mussels (Bivalvia: Unionida) in northern Borneo, and identified drivers of present distribution and threats. Past distribution data were collected from literature and museum resources. Present distribution data were collected from 21 river basins, and 47 water quality, climatic, landscape and human variables explored as potential predictors of species presence/ absence. Species delimitations were identified by morphology and COI barcoding, and haplotype networks generated. Our data indicate that over the past 50 years, four of originally five native species have become very rare or possibly locally extirpated. Since these four species are endemic to Borneo, other Bornean river basins should urgently be surveyed to identify any remaining populations. In the same time span, the non-native Sinanodonta woodiana has become the most widespread freshwater mussel in northern Borneo. The fifth native species was identified as Rectidens sumatrensis and found in four Sarawakian river basins, thus contradicting previous assumptions of an endemic Bornean Rectidens species. Although a number of stable R. sumatrensis populations are retained across Sarawak, the species' strong spatial contraction in mainland Sundaland and apparent low tolerance to eutrophication suggest that it is vulnerable to further habitat alteration. Our results indicate that Borneo's (endemic) freshwater invertebrate biodiversity is declining rapidly. Comprehensive surveys targeting an array of invertebrate and vertebrate taxa are needed to identify Borneo's freshwater biodiversity hotspots, where conservation efforts should be concentrated.

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Section: Introductionmentioning

confidence: 99%

Changes and drivers of freshwater mussel diversity and distribution in northern Borneo

Zieritz

Bogan

Rahim

et al. 2018

Biological Conservation

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“…Results from this study are in line with Nwani et al [68] for attributing detected ambiguities to taxonomic over-splitting, introgressive hybridization, recent radiation or incomplete lineage sorting. Harrison & Stiassny [69] also ascribed the loss of diversity in freshwater fish to unprecedented hybridizations from introductions of interrelated species. These observations stress the need for DNA barcoding to be tentatively embraced and form part of the routine monitoring tool, complementing officially recognised traditional methods in Zambia.…”

Section: Discussionmentioning

confidence: 99%

DNA barcoding affirms the presence of invasiveParachanna obscuraand new records of some species in the Mweru-Luapula fishery

Seemani,

Katongo,

Bloomer

et al. 2024

Preprint

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DNA barcoding has recently been instrumental in identifying both invasive and undetected species in aquatic environments. This study aimed at analysing collected fish fin clips to ascertain the identity of native species and the Parachanna species that have invaded the Mweru-Luapula (ML) fishery of Zambia. The identification process was carried out through field phenotypic analysis using species guides and DNA barcoding, with the mitochondrial DNA (mtDNA) cytochrome C oxidase 1 (COI) gene fragment. Of the 28 specimens for which DNA was successfully PCR amplified, five matched the reference sequences of species and 22 matched the reference sequences of genera on the NCBI GenBank. Five unexpected species, namely Oreochromis niloticus, Coptodon zillii, Mormyrus kannume, Thoracochromis buysi and Tylochromis polylepis were identified. The study further affirmed the presence of invasive Parachanna obscura in the fishery and its interconnected water bodies. Parachanna obscura invaded the fishery through annual flooding from aquacultural facilities in the Democratic Republic of Congo (DRC). There is a need to investigate this invasion further by using large sample sizes and also by applying the gonadosomatic index (GSI) to determine invasive species occupancy and impact on native species throughout the fishery. This study provides a platform for further detailed taxonomic verification and species inventory of the entire ML fishery. This will facilitate the development of a viable and sustainable strategy to appropriately curb the impact of invasive species, and will thus contribute to the conservation of the ML aquatic biodiversity.

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“…However, 99.7% of the freshwater is frozen in glaciers and polar ice caps, stored as groundwater, or trapped in permafrost or soil moisture (Harrison, 1999.) [3] In actuality, the more than 10,250 freshwater fish species (as well as all other animals with a freshwater habitat restriction) only have access to around 0.009% of the total amount of water on Earth. We face competition from other organisms like fish for this finite supply of freshwater.…”

Section: Introductionmentioning

confidence: 99%

Conservation strategies for fish biodiversity to maintain healthy ecosystem

Pawde¹,

Thaware²,

Paul³

2023

Int. J. Fish. Aquat. Stud.

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Fish is a distinctive aquatic food item that benefits both physical and mental health. Fish serves as a useful diet that contributes to human growth and development as well as the prevention and treatment of many ailments that are linked to modern civilization. High quality protein, fat, carbohydrate, minerals, and vitamins found in fish are all beneficial to human nutrition. The most important requirement for sustainable development is to eradicate hunger and malnutrition. As a result, numerous methods of ensuring food and nutritional security are being investigated. Anthropogenic activities such as urbanization, industrialisation, agriculture, cultural deterioration, and overpopulation have had a particularly negative impact on aquatic habitats. The available data clearly suggests that human populations and damaging activities, including as fishing, are growing at the same time as fish numbers and variety are declining. Thus, this study focused on Conservation strategies for fish biodiversity to maintain healthy ecosystem.

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The Quiet Crisis

Cited by 83 publications

References 67 publications

Changes and drivers of freshwater mussel diversity and distribution in northern Borneo

Changes and drivers of freshwater mussel diversity and distribution in northern Borneo

DNA barcoding affirms the presence of invasiveParachanna obscuraand new records of some species in the Mweru-Luapula fishery

Conservation strategies for fish biodiversity to maintain healthy ecosystem

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