The Consequences of Anthropogenic Stressors on Cichlid Fish Communities: Revisiting Lakes Victoria, Kyoga, and Nabugabo

Natugonza, Vianny; Musinguzi, Laban; Kishes, Mary A.; Rijssel, J.C. van; Seehausen, Ole; Ogutu‐Ohwayo, R.

doi:10.1007/978-94-024-2080-7_7

Cited by 11 publications

(9 citation statements)

References 84 publications

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“…Then 20-15 years ago (1998)(1999)(2000)(2001)(2002)(2003) was the Ne recovery phase, and finally, Ne completely increased to the current size, again coinciding with when the partial resurgence of Haplochromine was reported (Witte et al 2007;Natugonza et al 2021). A Ne in the population contraction phase of bottleneck might reflect an excess number of homozygous loci as seen in an elevated inbreeding coefficient and ROH pattern (Fig.…”

Section: Discussionmentioning

confidence: 98%

“…On the contrary, more than 200 endemic Haplochromines were estimated as extinct after the expansion of the Nile perch (Ribbink 1987;Ogutu-Ohwayo 1990;Seehausen 1996). Many empirical and observational studies confirmed demographic changes in Haplochromines after the upsurge of Nile perch such as the decline of population size (Kaufman 1992;Wanink et al 2008;Witte et al 2008;McGee et al 2015;van Rijssel et al 2015;Kishe-Machumu et al 2017;Natugonza et al 2021) In 12 trophic groups of Haplochromines, piscivores, a trophic group mainly consuming fish, are considered as experienced a population decline Seehausen 1996;McGee et al 2015). However, these studies paid major attention to fish eaters as a representative of piscivores but not paedophages (egg-eater) , a trophic group that feeds eggs and fries by stealing them from female buccal (Greenwood 1959).…”

Section: Introductionmentioning

confidence: 94%

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A severe bottleneck impacted the genomic structure of egg-eating cichlids

Imamoto,

Nakamura,

Aibara

et al. 2023

Preprint

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The explosive adaptive radiation of Haplochromine cichlids in Lake Victoria, East Africa, produced 500 endemic species within only 15,000 years. A paedophage or an egg-eater is considered a unique example of trophic adaptation. Many field studies reported that more than 200 cichlids have extinct due to the upsurge of Nile perch, a carnivorous species introduced to the lake in the 1950s. Especially, piscivorous cichlids like paedophages were critically damaged by Nile perch predation. Here, we performed a genome-wide evolutionary study of the paedophages in Lake Victoria to understand their past demographic events and phylogenetic relationships. We discovered evidence of a recent, short-period, and severe bottleneck in a paedophage "matumbi hunter". Interestingly, the signature of a strong bottleneck, as observed in matumbi hunter, was not detected in other species including paedophagus species. In addition, it was revealed that the population size of matumbi hunter started to decline 30 years ago and recover from 20 to 10 years ago, corresponding to the time of both disappearance and resurgence of Lake Victoria Haplochromines were reported. Although population structure analyses showed that matumbi hunter is composed of a unique genetic component, phylogenetic analyses supported its strong monophyly with other paedophagus species. These results suggest that the paedophages originated only once in Lake Victoria followed by the decline of genetic diversity in matumbi hunter. This study succeeded to demonstrate the demographic events triggered by invasive species and associated genomic consequences of the unique trophic group, promoting a holistic understanding of adaptive radiation.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 94%

A severe bottleneck impacted the genomic structure of egg-eating cichlids

Imamoto,

Nakamura,

Aibara

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…For instance, all sh families occurring in the Lake Edward system occur in Lake Victoria, although four families that are native to Lake Victoria (i.e., Alestidae, Mastacembelidae, Mochokidae and Schilbeidae) are absent in the Edward system (Decru et al, 2020). The three systems are often collectively referred to as the Lake Victoria region (e.g., Greenwood, 1966;Natugonza et al, 2021). The connection between Lake Victoria and Kyoga is clear: the two systems are directly connected by Victoria Nile.…”

Section: Discussionmentioning

confidence: 99%

The non-Haplochromis fish fauna in Uganda: an update on the distribution and a review of data gaps

Akoth

Natugonza

Efitre

et al. 2023

Environ Monit Assess

Self Cite

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Freshwater shes are the second most threatened group of vertebrates after amphibians. In most developing countries, the conservation of freshwater shes is largely hampered by limited information and data. The Red List assessments by the International Union for Conservation of Nature (IUCN) provide a benchmark for conservation and planning, but these assessments require, inter alia, quantitative information on the species range in the wild. This information is largely missing for many species that face extinction threats. In this paper, we combined species occurrence data, expert knowledge, and literature to review and update the distribution of non-Haplochromis sh species native to Uganda and determine their geographical extent relative to the global range. Results showed that (i) at least 110 non-Haplochromis species occur in Uganda, (ii) the current status in the entire native range for more than 60% of these species is unknown; (iii) ve species previously known to occur in Uganda: Amphilius kivuensis, Bagrus degeni, Marcusenius macrolepidotus, Petrocephalus catostoma, and Lacustricola pumilus lack a native locus and hence not Ugandan shes, (iv) 17 species occur in areas beyond their previously known range, and therefore, their presence needs further investigations, preferably by examining specimen collections, and (v) majority of the non-Haplochromis species native to Uganda have a wide distribution outside the national boundaries. We anticipate this information to be relevant both for the national and global IUCN Red List assessments for the non-Haplochromis shes in Uganda. Furthermore, the identi ed data gaps will be relevant in prioritizing limited resources during surveys and collections.

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“…For instance, all sh families occurring in the Lake Edward system occur in Lake Victoria, although four families that are native to Lake Victoria (i.e., Alestidae, Mastacembelidae, Mochokidae and Schilbeidae) are absent in the Edward system (Decru et al 2019). The three systems are often collectively referred to as the Lake Victoria region (e.g., Greenwood 1966;Natugonza et al 2021). The connection between Lake Victoria and Kyoga is clear: the two systems are directly connected by Victoria Nile.…”

Section: Discussionmentioning

confidence: 99%

The non-Haplochromis fish fauna in Uganda: an update on the distribution and a review of data gaps

Akoth

Natugonza

Efitre

et al. 2022

Preprint

View full text Add to dashboard Cite

Freshwater fishes are the second most threatened group of vertebrates after amphibians. In most developing countries, the conservation of freshwater fishes is largely hampered by limited information and data. The International Union for Conservation of Nature (IUCN) Red List assessments provide a benchmark for conservation and development planning, but these assessments require, inter alia, quantitative information on the species range in the wild. This information is largely missing for many species that face extinction. In this paper, we combined species occurrence data, expert knowledge, and literature to review and update the distribution of non-Haplochromis fish species native to Uganda and determine their geographical extent relative to the global range. Results showed that (i) at least 110 non-Haplochromis species occur in Uganda, (ii) the current status in the entire native range for more than 60% of these species is unknown; (iii) five species previously known to occur in Uganda: Amphilius kivuensis, Bagrus degeni, Marcusenius macrolepidotus, Petrocephalus catostoma, and Lacustricola pumilus lack a native locus and hence not Ugandan fishes, (iv) 17 species occur in areas beyond their previously known range, and therefore, their presence needs further investigations, preferably by examining specimen collections, and (v) majority of the non-Haplochromis species native to Uganda have a wide distribution outside the national boundaries. We anticipate this information to be relevant both for the national and global IUCN Red List assessments for the non-Haplochromis fishes in Uganda. Furthermore, the identified data gaps will be relevant in prioritizing limited resources during surveys and collections.

show abstract

The Consequences of Anthropogenic Stressors on Cichlid Fish Communities: Revisiting Lakes Victoria, Kyoga, and Nabugabo

Cited by 11 publications

References 84 publications

A severe bottleneck impacted the genomic structure of egg-eating cichlids

A severe bottleneck impacted the genomic structure of egg-eating cichlids

The non-Haplochromis fish fauna in Uganda: an update on the distribution and a review of data gaps

The non-Haplochromis fish fauna in Uganda: an update on the distribution and a review of data gaps

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