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233 results for “Congo Basin”
FIGURE 4. A in A new small barb (Cyprininae: Smiliogastrini) from the Louesse, Lekoumou (upper Niari basin), and Djoulou (upper Ogowe basin) rivers in the Republic of Congo, west-central Africa
FIGURE 4. A, Known distributional range of Enteromius walshae; yellow stars indicate collection sites and red star indicates collection locality of holotype (AMNH 266856). B, Type locality of holotype, in a small tributary of the Mandoro River (upper Louesse River basin).
FIGURE 1 in A new small barb (Cyprininae: Smiliogastrini) from the Louesse, Lekoumou (upper Niari basin), and Djoulou (upper Ogowe basin) rivers in the Republic of Congo, west-central Africa
FIGURE 1. Enteromius species sampled (table 1), photographed immediately postmortem or in preservation: A, kuiluensis; B, martorelli; C, prionacanthus; D, rouxi, E, rubrostigma; F, trispilomimus; G, walshae new species; H, nigroluteus; I, brichardi; J, camptacanthus; K, chiumbeensis; L, diamounanganai; M, guirali; N, holotaenia; O, jae; P, catenarius; Q, castrasibutum. No tissues are currently available for E. catenarius. Photograph of E. castrasibutum courtesy of Jon Armbruster.
Figure 11 in Six new dactylogyrid species (Platyhelminthes, Monogenea) from the gills of cichlids (Teleostei, Cichliformes) from the Lower Congo Basin
Figure 11. Haptoral and genital hard parts of Onchobdella ximenae n. sp. from Hemichromis elongatus. Accessory piece of the MCO in grey, to highlight the plate-like structure of the accessory piece. I-VI, hooks; AP, accessory piece; DA, dorsal anchors; DB, dorsal transverse bar; MCO, male copulatory organ; Pe, penis; VA, ventral anchors; VB, ventral transverse bars; Vg, vagina. Scale bar: 20 µm, scale bar of the MCO 10 µm.
Figure 9 in Six new dactylogyrid species (Platyhelminthes, Monogenea) from the gills of cichlids (Teleostei, Cichliformes) from the Lower Congo Basin
Figure 9. Haptoral and genital hard parts of Cichlidogyrus omari n. sp. from Tylochromis praecox. Accessory piece of the MCO in grey, to highlight the plate-like structure of the accessory piece. I–VII, hooks; AP, accessory piece; DA, dorsal anchors; DB, dorsal transverse bar; MCO, male copulatory organ; Pe, penis; VA, ventral anchors; VB, ventral transverse bar. Scale bar: 20 µm.
Figure 3 in Six new dactylogyrid species (Platyhelminthes, Monogenea) from the gills of cichlids (Teleostei, Cichliformes) from the Lower Congo Basin
Figure 3. Haptoral and genital hard parts of Cichlidogyrus bixlerzavalai n. sp. from Tylochromis praecox. Accessory piece of the MCO in grey, to highlight the plate-like structure of the accessory piece. I–VII, hooks; AP, accessory piece; DA, dorsal anchors; DB, dorsal transverse bar; MCO, male copulatory organ; Pe, penis; VA, ventral anchors; VB, ventral transverse bar. Scale bar: 20 µm.
Figure 2 in Six new dactylogyrid species (Platyhelminthes, Monogenea) from the gills of cichlids (Teleostei, Cichliformes) from the Lower Congo Basin
Figure 2. Schematic representation of the measurements taken of the hard parts of specimens of Cichlidogyrus and Onchobdella. Structures from top left to bottom right: anchor, ventral transverse bar, MCO, dorsal transverse bar, vagina and hook. Abbreviations: I–VII, hook length; a, total anchor length; Ap, length of accessory piece; b, blade length; c, shaft length; d, guard length, e, point length; h, auricle length; He, Heel length; l, vagina width; L, vagina length; Pe, penis length; W, maximum width of ventral transverse bar; w, maximum width of dorsal transverse bar; X, branch length of ventral transverse bar; x, total length of dorsal transverse bar; y, distance between auricles.
Figure 6 in Six new dactylogyrid species (Platyhelminthes, Monogenea) from the gills of cichlids (Teleostei, Cichliformes) from the Lower Congo Basin
Figure 6. Haptoral and genital hard parts of Cichlidogyrus polyenso n. sp. from Hemichromis elongatus. Accessory piece of the MCO in grey, to highlight the plate-like structure of the accessory piece. I–VII, hooks; AP, accessory piece; DA, dorsal anchors; DB, dorsal transverse bar; MCO, male copulatory organ; Pe, penis; VA, ventral anchors; VB, ventral transverse bar; Vg, vagina. Scale bar: 20 µm.
Figure 1 in Six new dactylogyrid species (Platyhelminthes, Monogenea) from the gills of cichlids (Teleostei, Cichliformes) from the Lower Congo Basin
Figure 1. Overview of sampling localities (red dots) with the ecoregions in italics. Localities 3 and 5 are located within the cities MbanzaNgungu and Kisantu, respectively. The inset shows the Lower Congo region on the African continent. Sampling localities: 1, Tondé Estuary near Muanda (05°57035.900 S 12°21058.400 E); 2, Muila Kaku, mangroves near Lower Congo River (05°5903300 S 12°35003.200 E); 3, Ndimba Leta ponds, Mbanza-Ngungu, in between the Lunzadi and Lukasi rivers of which the latter flows into the Kwilu and Likunga (05°1501000 S 14°5102400 E); 4, Pond near Kila Kindinga and Lukasi river (5°290700 S 14°530400 E); 5, Inkisi River, off the Jardin botanique de Kisantu (05°0800200 S 15°0305200 E); 6, Mvuazi River, Inkisi (5°190 S 15°70 E); 7, Mbola River near Tshianya village (05°52009.800S 12°39052.600 E); 8, Congo River near Nganda Flash station (06°02001.800 S 12°31048.200E), 9, Muila Nzenze, Kibamba village, mangroves near Congo River (06°00006.800 S 12°4002700 E). Rivers in blue.
Figure 10 in Six new dactylogyrid species (Platyhelminthes, Monogenea) from the gills of cichlids (Teleostei, Cichliformes) from the Lower Congo Basin
Figure 10. Haptoral and genital hard parts of Cichlidogyrus reversati from Coptodon tholloni. Accessory piece of the MCO in grey, to highlight the plate-like structure of the accessory piece. I–VII, hooks; AP, accessory piece; DA, dorsal anchors; DB, dorsal transverse bar; MCO, Male Copulatory Organ; Pe, penis; VA, ventral anchors; VB, ventral transverse bar. Scale bar: 20 µm.
Figure 7 in Six new dactylogyrid species (Platyhelminthes, Monogenea) from the gills of cichlids (Teleostei, Cichliformes) from the Lower Congo Basin
Figure 7. Haptoral and genital hard parts of Cichlidogyrus kmentovae n. sp. from Hemichromis stellifer. Accessory piece of the MCO in grey, to highlight the plate-like structure of the accessory piece. I-VII, hooks; AP, accessory piece; DA, dorsal anchors; DB, dorsal transverse bar; MCO, male copulatory organ; Pe, penis; VA, ventral anchors; VB, ventral transverse bar; Vg, vagina. Scale bar: 20 µm.
Figure 5 in Six new dactylogyrid species (Platyhelminthes, Monogenea) from the gills of cichlids (Teleostei, Cichliformes) from the Lower Congo Basin
Figure 5. Haptoral and genital hard parts of Cichlidogyrus calycinus n. sp. from Hemichromis elongatus. Accessory piece of the MCO in grey, to highlight the plate-like structure of the accessory piece. I–VII, hooks; AP, accessory piece; DA, dorsal anchors; DB, dorsal transverse bar; MCO, male copulatory organ; Pe, penis; VA, ventral anchors; VB, ventral transverse bar; Vg, vagina. Scale bar: 20 µm.
Figure 8 in Six new dactylogyrid species (Platyhelminthes, Monogenea) from the gills of cichlids (Teleostei, Cichliformes) from the Lower Congo Basin
Figure 8. DIC micrographs of (a–b) Cichlidogyrus kmentovae n. sp. from Hemichromis stellifer: haptor (a), MCO (b); of (c–d) Cichlidogyrus omari n. sp. from Tylochromis praecox: haptor of holotype (c), MCO of holotype (d); compound micrographs of (e–f) Onchobdella ximenae n. sp. from Hemichromis elongatus: haptor (e), MCO (f). Scale bar 20 µm, except for (e) 50 µm.
Figure 4 in Six new dactylogyrid species (Platyhelminthes, Monogenea) from the gills of cichlids (Teleostei, Cichliformes) from the Lower Congo Basin
Figure 4. Compound micrographs of (a–c) Cichlidogyrus bixlerzavalai n. sp. from Tylochromis praecox: haptor of holotype (a), MCO of holotype (b) and MCO of paratype (c); of (d–f) Cichlidogyrus calycinus n. sp. from Hemichromis elongatus: haptor of holotype (d), MCO of holotype (e), vagina of holotype (f); of (g–h) Cichlidogyrus polyenso n. sp. from Hemichromis elongatus: haptor (g), MCO (h). Scale bar 20 µm, except for (g) 50 µm.
Figure 2 in AfriBasins: a new framework in FishBase for the analysis of African fresh and brackish water fish distributions, with a discussion on the Congo basin fauna
Figure 2. – Family level composition of the fish fauna of the Congo Basin s.s. "Other" includes the following families: Tetraodontidae, Bagridae, Citharinidae, Dasyatidae, Hepsetidae, Protopteridae, Syngnathidae, Mugilidae, Notopteridae, Channidae, Ariidae, Cynoglossidae, Elopidae, Pristigasteridae, Latidae, Megalopidae, Ophichthidae, Pantodontidae, Phractolaemidae, Pristidae and Carangidae.
Figure 5 in AfriBasins: a new framework in FishBase for the analysis of African fresh and brackish water fish distributions, with a discussion on the Congo basin fauna
Figure 5. – Cluster analysis on the fish distribution data for the Congo Basin s.s., based on (A) the Ochiai coefficient and (B) the correlation ratio.
Figure 7 in AfriBasins: a new framework in FishBase for the analysis of African fresh and brackish water fish distributions, with a discussion on the Congo basin fauna
Figure 7. – Evolution of the estimated number of species based on various definitions of the Congo basin: Central Congo, i.e. Kinshasa to Kisangani, without Kasai upstream from Mushie (Poll and Gosse, 1963); without lakes Bangweulu and Mweru (Roberts, 1972); entire Congo (Poll, 1973); excluding Lake Tanganyika (Lowe-McConnell, 1987); excluding lakes Tanganyika and Mweru, primary freshwater species (Teugels and Guégan, 1994); Zaïre, probably only includes primary freshwater species (Lévêque, 1997); Zaïre, probably includes primary, secondary and peripheral species (Lévêque, 1997); Congo River system, at least 700 species (Skelton, 2001); Congo and Lake Tanganyika (Revenga and Kura, 2003); Congo River system (Thieme et al., 2005); the Congo (Dumont, 2009); Congo basin including the Rift Valley region with lakes Tanganyika and Kivu and the Malagarasi basin (Snoeks et al., 2011).
Figure 3 in Fish community assemblages in relation to environmental variables in the Lefini River, middle Congo River basin (Republic of Congo)
Figure 3. – RDA ordination of species, stations and the three forward selected environmental variables. A: Biplot of stations and environment variables (1-5: habitats 1-5); B: Biplot of stations and species. ▲: grass bank stations; ●: forest bank stations.
Figure 1 in Fish community assemblages in relation to environmental variables in the Lefini River, middle Congo River basin (Republic of Congo)
Figure 1. – Sampling stations (1-12). Grass bank stations: 1, 4, 5, 6, 10 and 11; Forest bank stations: 2, 3, 7, 8, 9 and 12; LFR: Lefini Faunal Reserve; LLGNR: the Lesio-Louna Gorilla Natural Reserve.
Inbreeding depression, functional traits and phenotypic plasticity in an endangered tree species from Congo basin with a mixed mating system
<h3><span>Inbreeding depression, functional traits and phenotypic plasticity in an endangered tree species from Congo basin with a mixed mating system</span></h3> <h1><a name="_Hlk166486742"></a><strong><span>Abstract</span></strong></h1> <p><span><span>1. Most tree species can suffer from inbreeding depression (ID), which they escape by reproducing predominantly through outcrossing. A remarkable exception is <em>Pericopsis elata</em>, an African timber species naturally producing 54% of self-fertilized seeds in the eastern Congo Basin. This species is highly logged and suffers from a deficit of natural regeneration, so that silviculture is needed for its sustainable management. While selecting good genetic material can increase the value of plantations, we lack fundamental biological knowledge on the effect of inbreeding and competition on growth potential, variability in leaf traits and phenotypic plasticity. We hypothesize that ID in <em>P. elata</em> could result from the expression of deleterious mutations affecting functional traits, or from a reduction of adaptive phenotypic plasticity in inbred genotypes.</span></span></p> <p><span><span>2. To test our hypotheses, 540 <em>P. elata</em> seedlings were monitored for 4 years in a Nelder-type device located in the DRC, in which trees were planted along concentric circles to generate a density gradient. Nine leaf morphological traits (including specific leaf area, stomata density and size), eight leaf chemical traits, diameter, and total height were measured regularly, while paternity analyses allowed distinguishing inbred and outbred plants. To explain the observed ID on growth, we tested whether inbreeding affected leaf traits and/or their plasticity expressed across years, across the density gradient or across sunlight exposure. </span></span></p> <p><span><span>3. Outbred plants grew faster than inbred ones, demonstrating ID for each level of competition. Despite the significant correlation found between specific leaf area and growth, and the impact of planting density, plant age, and leaf exposure to sunlight on multiple traits, mean leaf trait values did not differ according to inbreeding. However, </span></span><span><span>a few leaf traits (chlorophyl content, </span></span><span><span>maximum stomatal water vapor conductance</span></span><span><span>, and leaf fresh mass) showed significantly higher plasticity in outbred than inbred plants. </span></span></p> <p><span><span>4. Synthesis: the observed ID on growth was not explained by a direct effect of inbreeding on the mean values of functional traits but possibly by a reduction of phenotypic plasticity with inbreeding. Additional studies on the interplay between ID, functional traits and plasticity should be conducted at the intra-specific level to identify general patterns<em>.</em></span></span></p> <p><span><strong><span>Key-words : </span></strong></span><span><span>Inbreeding depression, phenotypic plasticity, silviculture, functionals traits, <em>Pericopsis elata</em>, mating system, Nelder device.</span></span></p>
pXRF investigation of copper objects from the Congo Basin (Museum of Anthropology and Archaeology (MAA), University of Cambridge)
<p>This dataset contains the data related to the pXRF analyses conducted on copper objects from the Congo Basin curated at the Museum of Anthropology and Archaeology (MAA), University of Cambridge in December 2020. The study has been done in the framework of the H2020-MSCA-IF-2019 Project Number 890896 ‘An Archaeology of Exchange Networks in Central Africa. The Cases of the Copperbelt and Niari Basin Copper Deposits’ (ArCAN).</p> <p><a href="http://cordis.europa.eu/project/id/890896">https://cordis.europa.eu/project/id/890896</a></p> <p>All information about the dataset can be found in the readme file.</p>
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