Grasping ecological opportunities: not one but five paedophagous species of Haplochromis (Teleostei: Cichlidae) in the Lake Edward system

Vranken, Nathan; Steenberge, Maarten Van; Snoeks, Jos

doi:10.1007/s10750-018-3742-5

Cited by 17 publications

(31 citation statements)

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“…The taxonomy of the Haplochromis spp. from the Lake Edward system remains largely understudied and many of its species remain undescribed (Vranken et al ., ). As this group is currently under revision and exhibits a much higher species richness than reported before, we did not include them in this study.…”

Section: Introductionmentioning

confidence: 97%

Where ichthyofaunal provinces meet: the fish fauna of the Lake Edward system, East Africa

Decru

Vranken

Bragança

et al. 2019

Journal of Fish Biology

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Based on literature, museum collections and three recent expeditions, an annotated species list of the Lake Edward, East Africa, drainage system is presented, excluding the endemic haplochromines. A total of 34 non-Haplochromis species belonging to 10 families and 21 genera are recorded from the system. Three of these are endemic and two others have been introduced in the region. Six species are new records for the Lake Edward system. A species accumulation curve indicates that we probably covered most of the non-Haplochromis species in the area sampled during the recent expeditions, but undetected species might still be present in the Congolese part of the system, which is poorly sampled. A comparison of the species list with those of neighbouring basins confirmed the placement of the Lake Edward system within the east-coast ichthyofaunal province. K E Y W O R D Sbiogeography, East Coast Province, ichthyofaunal affinities, introduced species, Lake George

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Section: Introductionmentioning

confidence: 97%

Where ichthyofaunal provinces meet: the fish fauna of the Lake Edward system, East Africa

Decru

Vranken

Bragança

et al. 2019

Journal of Fish Biology

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“…Twenty‐eight measurements were taken as defined by Vranken et al . (): standard length ( L S ); head length ( L H ); body depth (BD); predorsal (PrD), preanal (PrA), prepectoral (PrP) and prepelvic distance (PrV); pectoral (PL) and pelvic‐fin length (VL); dorsal‐fin base length (DFB) and anal‐fin base length (AFB); caudal‐peduncle length (CPL) and depth (CPD); head width (HW); eye diameter (ED); interorbital width (IOW); snout length (SnL); lacrimal depth (LaD); cheek depth (ChD); premaxillary pedicle length (PPL); upper‐jaw length (UJL); lower‐jaw length (LJL); lower‐jaw width (LJW); lower pharyngeal length (LPL; n = 12); lower pharyngeal width (LPW; n = 12); dentigerous area length (DAL; n = 12); dentigerous area width (DAW; n = 12); and gut length (GL; n = 16). Snout and gape inclinations were measured in degrees using a protractor following the terminology of Barel et al .…”

Section: Methodsmentioning

confidence: 99%

“…Twenty‐one counts were taken as defined by Vranken et al . (): upper outer teeth (UOT); and lower outer teeth (LOT); upper and lower inner tooth rows (UTR/LTR); dorsal‐fin formula (DFR: DFRs/DFRr); anal‐fin formula (AFR: AFRs/AFRr); pectoral‐fin formula (PFR), consisting of spine and branched‐ray counts; gill raker formula (GR: GRc/1/GRe), consisting of cerato‐ and epibranchial gill raker counts; abdominal and caudal vertebrae (V: Va/Vc); longitudinal‐line scales (LongL); lateral‐line scales (LatL: LatLu/LatLl), consisting of upper and lower lateral line scale counts; upper transverse‐line scales (D‐ULL); lower transverse‐line scales (ULL‐A); scales between pectoral and pelvic fins (P‐V); infraorbital and postorbital cheek scales (ChS: ChSi/ChSp); and lower pharyngeal teeth in the posterior row (LPTp; n = 12).…”

Section: Methodsmentioning

confidence: 99%

“…Both lakes harbour a similar ichthyofauna and are treated as a single system: the Lake Edward system. This system is home to a large assemblage of cichlids of the genus Haplochromis Hilgendorf 1888, consisting of an estimated 60–100 species (Greenwood, ; Vranken et al ., ,b). These species are closely related to the species of Haplochromis from Lakes Albert, Kivu, Kyoga and Victoria and associated lakes and river systems and, together, form the Lake Victoria region superflock (LVRS; Salzburger et al ., ; Verheyen et al ., ).…”

Section: Introductionmentioning

confidence: 99%

“…() and Vranken et al . (,b) in retaining all haplochromines of the LVRS in Haplochromis . The definitions of most ‘genera sensu Greenwood ()’ are largely based on traits associated with the trophic morphologies ( e.g ., the oral and pharyngeal jaws and dentitions).…”

Section: Introductionmentioning

confidence: 99%

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Similar ecology, different morphology: Three new species of oral‐mollusc shellers from Lake Edward

Vranken

Steenberge

Snoeks

2019

Journal of Fish Biology

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Lake Edward, East Africa, harbours a largely understudied assemblage of haplochromine cichlids that displays a range of adaptions to various specialised trophic niches. In this system, we discovered specimens of Haplochromis with morphologies similar to those of oral-mollusc shellers from Lake Victoria. These morphologies are characterised by short oral jaws with stout teeth that are used either to crush molluscs or to grab the soft bodies of snails and wrench them out of their shells. A morphometric study on 47 specimens from Lake Edward revealed the presence of three new species with an oral-shelling morphology: Haplochromis concilians sp. nov., H. erutus sp. nov. and H. planus sp. nov. All three species are formally described.Stomach-content observations confirmed an opportunistic oral-shelling ecology for H. concilians sp. nov. and H. erutus sp. nov. Within H. planus sp. nov., only large specimens displayed a specialised oral-shelling morphology, but their stomachs were nearly empty, while small specimens consumed mainly Ostracoda and Hydrachnidia.Remarkably, the three species differed considerably in morphology from each other, but they each resembled oral-sheller species from

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State of knowledge of aquatic ecosystem and fisheries of the Lake Edward System, East Africa

Musinguzi,

Vranken,

Natugonza

et al. 2023

Aquaculture Fish & Fisheries

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Poor and unreliable knowledge of the status of freshwater fisheries limits their inclusion in governance processes, thereby impeding effective management measures. This threatens the livelihoods of people, particularly in developing countries. Improved knowledge is required to draw the attention of policymakers and stimulate effective management measures to accelerate the sustainability of the freshwater fisheries. In line with this requirement, this paper provides the state of knowledge of the aquatic ecosystem and fisheries of the Lake Edward system, East Africa, focusing on lakes Edward, George and the Kazinga channel. The state of knowledge was accomplished by reviewing existing data and information on aspects of primary productivity and water quality, invertebrates, fish fauna, fish life history and ecology, and fisheries. The waterbodies have been monitored since the 1930s, albeit sporadically, providing data on all the above aspects but with substantial temporal gaps. Adequate and updated data and information exist on the water quality status of the water bodies, extant aquatic taxa (including fishes) and fish catches but with uncertainties in the latter. Data and information gaps exist on the abundance of biotic communities, fish life history, quantitative trophic ecology and fisheries management reference points. The aggregated data and information can directly support decisions for fisheries management. We recommend regular monitoring to fill the data and information gaps, more comprehensive stock assessments and the development of aquatic ecosystem models.

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Grasping ecological opportunities: not one but five paedophagous species of Haplochromis (Teleostei: Cichlidae) in the Lake Edward system

Cited by 17 publications

References 30 publications

Where ichthyofaunal provinces meet: the fish fauna of the Lake Edward system, East Africa

Where ichthyofaunal provinces meet: the fish fauna of the Lake Edward system, East Africa

Similar ecology, different morphology: Three new species of oral‐mollusc shellers from Lake Edward

State of knowledge of aquatic ecosystem and fisheries of the Lake Edward System, East Africa

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