Diet overlap between the newly introduced Lamprichthys tanganicanus and the Tanganyika sardine in Lake Kivu, Eastern Africa

Masilya, M. P.; Darchambeau, François; Isumbisho, Mwapu; Descy, Jean-Pierre

doi:10.1007/s10750-011-0797-y

Cited by 10 publications

(6 citation statements)

References 37 publications

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“…Limnothrissa may therefore suffer from a lack of dietary resources during a major part of the year. This hypothesis is supported by observations of the fi sh ingestion rate: Masilya ( 2011 ) found that Limnothrissa ingested daily three times more copepods in the dry season than in the rainy season. In contrast, the mesozooplankton communities of both Lakes Malawi and Tanganyika comprise a large-bodied calanoid copepod, which is an ef fi cient grazer.…”

Section: The Food Web Structuresupporting

confidence: 59%

“…What is its impact on littoral and pelagic species? These issues have only been partially addressed so far, revealing the possibility of interspeci fi c competition between Limnothrissa and Lamprichthys from exploitation of the same planktonic and benthic preys (Masilya 2011 ;Masilya et al 2011 ) , calling for monitoring of the recent invader.…”

Section: Discussionmentioning

confidence: 99%

“…6 ). Still, phytoplankton composition matters, as it determines to a large extent the fate of primary production: the large diatoms dominating in the dry season tend to settle, while cyanobacteria, dominating in the rainy season, seem not to be consumed by mesozooplankton, as revealed by analysis of fatty acid markers (Masilya 2011 ) . Therefore, a substantial part of the primary production contributes to a downward nutrient and carbon fl ux (Chap.…”

Section: The Food Web Structurementioning

confidence: 99%

“…In Lake Kivu, the growth of Limnothrissa larvae and juveniles takes place in the inshore zone, which is spatially reduced and where fi shermen often use inappropriate fi shing techniques for catching the young fi sh. This activity, coupled with the incidence of predation by Limnothrissa adults and other fi sh species in inshore areas (De Iongh et al 1983 ;Masilya et al 2011 ) , might signi fi cantly reduce larvae survival. Likewise, little access to benthic resources, which are signi fi cant food items for Limnothrissa in both Lake Kivu (De Iongh et al 1983 ;Masilya 2011 ;Masilya et al 2011 ) and in Lake Tanganyika (Matthes 1968 ) , may not allow feeding the spawning stock and fry during the rainy season, when planktonic resources are low (Chap.…”

Section: The Food Web Structurementioning

confidence: 99%

“…Indeed, Lake Kivu phytoplankton comprises a large proportion of grazing-resistant forms, such as very long diatoms ( Nitzschia and Fragilaria ) or very small cyanobacteria ( Synechococcus ), both out of the typical size range (5-50 m m) of the copepod preys. Accordingly, the mesozooplankton diet consists of diatoms, chrysophytes and cryptophytes, plus some bacterivorous microzooplankton, but almost no cyanobacteria, as indicated by recent data based on fatty acid analysis in components of the pelagic food web (Masilya 2011 ) .…”

Section: Consequences Of the Sardine Introduction On Biogeochemical Pmentioning

confidence: 96%

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Lake Kivu Research: Conclusions and Perspectives

2012

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In this chapter the knowledge gained from the interdisciplinary research on Lake Kivu presented in the previous chapters is synthesized. The importance of the sublacustrine springs as a driving force for physical and biogeochemical processes is highlighted, the special properties of the lake's food web structure are discussed, and the consequences and impacts of both the introduction of a new fi sh species and methane extraction are evaluated. Finally, a list of open research questions illustrates that Lake Kivu has by far not yet revealed all of its secrets. Conclusions The Dynamics of the System: The Importance of the Subaquatic SpringsObservations of vertical pro fi les of temperature, conductivity and solutes in Lake Kivu show a remarkable horizontal homogeneity and temporal constancy. At fi rst sight, these observations may suggest that Lake Kivu is a relatively simple, near-steady-state

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Section: The Food Web Structuresupporting

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: The Food Web Structurementioning

confidence: 99%

Section: The Food Web Structurementioning

confidence: 99%

Section: Consequences Of the Sardine Introduction On Biogeochemical Pmentioning

confidence: 96%

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Lake Kivu Research: Conclusions and Perspectives

2012

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Species specificity and sexual dimorphism in tooth shape among the three sympatric haplochromine species in Lake Kivu cichlids

Munyandamutsa

Jere

Kassam

et al. 2020

Ecology and Evolution

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Tooth shape is used to differentiate between morphologically similar species of vertebrates, including fish. This study aimed to quantify tooth shape of three sympatric species: Haplochromis kamiranzovu, H. insidiae, and H. astatodon endemic to Lake Kivu, whose existing identification criteria are currently only qualitative. A quantitative tooth shape analysis was performed based on digitized tooth outline data with a subsequent elliptic Fourier analysis to test for differences among the three species. We looked at crown shape and size differences within H. kamiranzovu and H. insidiae at geographical, habitat, and gender levels. No comparison at habitat level was done for H. astatodon because it is found only in littoral zone. The analysis revealed significant tooth shape differences among the three species. Haplochromis astatodon had a significantly longer major cusp height and a longer and larger minor cusp than that of H. insidiae. It had also a longer major cusp height and a longer and larger minor cusp than that of H. kamiranzovu. Tooth shape differences of H. kamiranzovu and H. insidiae species were not significantly different between littoral and pelagic fish (p > .05) while differences were significant between southern and northern Lake Kivu populations (p < .05). Tooth sizes in H. kamiranzovu and H. insidiae were significantly different, both in height and width as well as in their ratios, and this was true at sex and geographic levels (p < .05), but not at habitat level (p > .05). Tooth shape was also significantly different with sharp teeth for males compared with females of southern populations versus northern ones. These shape‐ and size‐related differences between sexes suggest differences in the foraging strategies toward available food resources in the lake habitat. Further research should explain the genetic basis of the observed pattern.

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