Organizing Maps and Machine Learning Models to Assess Mollusc Community Structure in Relation to Physicochemical Variables in a West Africa River–Estuary System
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Habitat Preference of Freshwater Snails in Relation to Environmental Factors
Mem Inst Oswaldo Cruz, Rio de Janeiro, Vol. 100(2): 169-176, April 2005 169 Habitat preference of freshwater snails in relation to environmental factors and the presence of the competitor snail Melanoides tuberculatus (Müller, 1774) Alexandre Giovanelli, Cesar Luiz Pinto Ayres Coelho da Silva/+, Geórgia Borges Eccard Leal, Darcílio Fernandes Baptista Laboratório da Avaliação e Promoção da Saúde Ambiental, Departamento de Biologia, Instituto Oswaldo Cruz-Fiocruz, Av. Brasil 4365, 21045-900 Rio de Janeiro, RJ, Brasil Our objective is to evaluate the habitat preference of freshwater snails in relation to environmental factors and the presence of the competitor snail Melanoides tuberculatus. In the first phase, snails was collected at 12 sites. This sampling sites presented a degree of organic input. In the second phase 33 sampling sites were chosen, covering a variety of lotic and lentic environments. The snail species found at Guapimirim, state of Rio de Janeiro, displayed a marked habitat preference, specially in relation to the physical characteristics of each environment. Other limit- ing factors for snail distribution at the studied lotic environments were the water current velocity and the amount of organic matter, mainly to Physa marmorata, M. tuberculatus, and Biomphalaria tenagophila. The absence of interac- tions between M. tuberculatus and another snails could be associated to the distinct spatial distribution of those species and the instability of habitats. This later factor may favor the coexistence of M. tuberculatus with B. glabrata by reduction of population density. In areas of schistosomiasis transmission some habitat modification may add to the instability of the environment, which would make room for the coexistence of M. -
Molecular Characterization of Liver Fluke Intermediate Host Lymnaeids
Veterinary Parasitology: Regional Studies and Reports 17 (2019) 100318 Contents lists available at ScienceDirect Veterinary Parasitology: Regional Studies and Reports journal homepage: www.elsevier.com/locate/vprsr Original Article Molecular characterization of liver fluke intermediate host lymnaeids (Gastropoda: Pulmonata) snails from selected regions of Okavango Delta of T Botswana, KwaZulu-Natal and Mpumalanga provinces of South Africa ⁎ Mokgadi P. Malatji , Jennifer Lamb, Samson Mukaratirwa School of Life Sciences, College of Agriculture, Engineering and Science, University of KwaZulu-Natal, Westville Campus, Durban 4001, South Africa ARTICLE INFO ABSTRACT Keywords: Lymnaeidae snail species are known to be intermediate hosts of human and livestock helminths parasites, Lymnaeidae especially Fasciola species. Identification of these species and their geographical distribution is important to ITS-2 better understand the epidemiology of the disease. Significant diversity has been observed in the shell mor- Okavango delta (OKD) phology of snails from the Lymnaeidae family and the systematics within this family is still unclear, especially KwaZulu-Natal (KZN) province when the anatomical traits among various species have been found to be homogeneous. Although there are Mpumalanga province records of lymnaeid species of southern Africa based on shell morphology and controversial anatomical traits, there is paucity of information on the molecular identification and phylogenetic relationships of the different taxa. Therefore, this study aimed at identifying populations of Lymnaeidae snails from selected sites of the Okavango Delta (OKD) in Botswana, and sites located in the KwaZulu-Natal (KZN) and Mpumalanga (MP) provinces of South Africa using molecular techniques. Lymnaeidae snails were collected from 8 locations from the Okavango delta in Botswana, 9 from KZN and one from MP provinces and were identified based on phy- logenetic analysis of the internal transcribed spacer (ITS-2). -
The Ecology and Natural Food Components of Pachymelania Aurita MÜLLER (Gastropoda: Melaniidae) in a Coastal Lagoon
Report and Opinion. 2009; 1(5) Uwadiae, et al. Ecology and Natural Food of P.aurita The ecology and natural food components of Pachymelania aurita MÜLLER (Gastropoda: Melaniidae) in a Coastal lagoon *Uwadiae RE, *Edokpayi CA and **Egonmwan RI *Department of Marine sciences, University of Lagos, Akoka , Yaba, Lagos, Nigeria. **Department of Zoology, University of Lagos, Akoka , Yaba, Lagos, Nigeria. Email: [email protected]. Tel: +2348063145723 Abstract: The ecology and natural food of Pachymelania aurita MỨLLER in a coastal Nigerian lagoon are reported. Ecological parameters were investigated by monthly sample collection from September, 2004 to August, 2006. Natural food components were identified by microscopic examination of the feacal matter. The abundance of the P. aurita was related to salinity, total organic content (TOC) and grain size of sediment at the study stations. Greater densities of P. aurita occurred at stations with relatively higher salinity (>1.77‰), low TOC (<10%), high sand (>60%) and low mud (<30%) contents. A range of 0.01 – 19.72‰ for water salinity was observed during this study, while sediment sand and mud recorded ranges of 65.8-92.8% and 7.8-29.4% respectively. The TOC of sediment ranged between 2.05 and 98.5%. Sediments at the study stations were predominantly sand intermixed with varied proportions of mud and varied rapidly within relatively short distances along the study stretch. A total of 6,869 individuals were recorded during the study, with wet and dry season contributions of 3,693 and 3,176 individuals respectively. Population of P. aurita was highest (490 individuals) in the month of January, 2005, while the lowest (230 individuals) was recorded in October, 2005. -
Gastropod Fauna of the Cameroonian Coasts
Helgol Mar Res (1999) 53:129–140 © Springer-Verlag and AWI 1999 ORIGINAL ARTICLE Klaus Bandel · Thorsten Kowalke Gastropod fauna of the Cameroonian coasts Received: 15 January 1999 / Accepted: 26 July 1999 Abstract Eighteen species of gastropods were encoun- flats become exposed. During high tide, most of the tered living near and within the large coastal swamps, mangrove is flooded up to the point where the influence mangrove forests, intertidal flats and the rocky shore of of salty water ends, and the flora is that of a freshwater the Cameroonian coast of the Atlantic Ocean. These re- regime. present members of the subclasses Neritimorpha, With the influence of brackish water, the number of Caenogastropoda, and Heterostropha. Within the Neriti- individuals of gastropod fauna increases as well as the morpha, representatives of the genera Nerita, Neritina, number of species, and changes in composition occur. and Neritilia could be distinguished by their radula Upstream of Douala harbour and on the flats that lead anatomy and ecology. Within the Caenogastropoda, rep- to the mangrove forest next to Douala airport the beach resentatives of the families Potamididae with Tympano- is covered with much driftwood and rubbish that lies on tonos and Planaxidae with Angiola are characterized by the landward side of the mangrove forest. Here, Me- their early ontogeny and ecology. The Pachymelaniidae lampus liberianus and Neritina rubricata are found as are recognized as an independent group and are intro- well as the Pachymelania fusca variety with granulated duced as a new family within the Cerithioidea. Littorini- sculpture that closely resembles Melanoides tubercu- morpha with Littorina, Assiminea and Potamopyrgus lata in shell shape. -
Constructional Morphology of Cerithiform Gastropods
Paleontological Research, vol. 10, no. 3, pp. 233–259, September 30, 2006 6 by the Palaeontological Society of Japan Constructional morphology of cerithiform gastropods JENNY SA¨ LGEBACK1 AND ENRICO SAVAZZI2 1Department of Earth Sciences, Uppsala University, Norbyva¨gen 22, 75236 Uppsala, Sweden 2Department of Palaeozoology, Swedish Museum of Natural History, Box 50007, 10405 Stockholm, Sweden. Present address: The Kyoto University Museum, Yoshida Honmachi, Sakyo-ku, Kyoto 606-8501, Japan (email: [email protected]) Received December 19, 2005; Revised manuscript accepted May 26, 2006 Abstract. Cerithiform gastropods possess high-spired shells with small apertures, anterior canals or si- nuses, and usually one or more spiral rows of tubercles, spines or nodes. This shell morphology occurs mostly within the superfamily Cerithioidea. Several morphologic characters of cerithiform shells are adap- tive within five broad functional areas: (1) defence from shell-peeling predators (external sculpture, pre- adult internal barriers, preadult varices, adult aperture) (2) burrowing and infaunal life (burrowing sculp- tures, bent and elongated inhalant adult siphon, plough-like adult outer lip, flattened dorsal region of last whorl), (3) clamping of the aperture onto a solid substrate (broad tangential adult aperture), (4) stabilisa- tion of the shell when epifaunal (broad adult outer lip and at least three types of swellings located on the left ventrolateral side of the last whorl in the adult stage), and (5) righting after accidental overturning (pro- jecting dorsal tubercles or varix on the last or penultimate whorl, in one instance accompanied by hollow ventral tubercles that are removed by abrasion against the substrate in the adult stage). Most of these char- acters are made feasible by determinate growth and a countdown ontogenetic programme. -
Freshwater Snails of Biomedical Importance in the Niger River Valley
Rabone et al. Parasites Vectors (2019) 12:498 https://doi.org/10.1186/s13071-019-3745-8 Parasites & Vectors RESEARCH Open Access Freshwater snails of biomedical importance in the Niger River Valley: evidence of temporal and spatial patterns in abundance, distribution and infection with Schistosoma spp. Muriel Rabone1* , Joris Hendrik Wiethase1, Fiona Allan1, Anouk Nathalie Gouvras1, Tom Pennance1,2, Amina Amadou Hamidou3, Bonnie Lee Webster1, Rabiou Labbo3,4, Aidan Mark Emery1, Amadou Djirmay Garba3,5 and David Rollinson1 Abstract Background: Sound knowledge of the abundance and distribution of intermediate host snails is key to understand- ing schistosomiasis transmission and to inform efective interventions in endemic areas. Methods: A longitudinal feld survey of freshwater snails of biomedical importance was undertaken in the Niger River Valley (NRV) between July 2011 and January 2016, targeting Bulinus spp. and Biomphalaria pfeiferi (intermedi- ate hosts of Schistosoma spp.), and Radix natalensis (intermediate host of Fasciola spp.). Monthly snail collections were carried out in 92 sites, near 20 localities endemic for S. haematobium. All bulinids and Bi. pfeiferi were inspected for infection with Schistosoma spp., and R. natalensis for infection with Fasciola spp. Results: Bulinus truncatus was the most abundant species found, followed by Bulinus forskalii, R. natalensis and Bi. pfeiferi. High abundance was associated with irrigation canals for all species with highest numbers of Bulinus spp. and R. natalensis. Seasonality in abundance was statistically signifcant in all species, with greater numbers associated with dry season months in the frst half of the year. Both B. truncatus and R. natalensis showed a negative association with some wet season months, particularly August. -
Resistant Pseudosuccinea Columella Snails to Fasciola Hepatica (Trematoda) Infection in Cuba : Ecological, Molecular and Phenotypical Aspects Annia Alba Menendez
Comparative biology of susceptible and naturally- resistant Pseudosuccinea columella snails to Fasciola hepatica (Trematoda) infection in Cuba : ecological, molecular and phenotypical aspects Annia Alba Menendez To cite this version: Annia Alba Menendez. Comparative biology of susceptible and naturally- resistant Pseudosuccinea columella snails to Fasciola hepatica (Trematoda) infection in Cuba : ecological, molecular and phe- notypical aspects. Parasitology. Université de Perpignan; Instituto Pedro Kouri (La Havane, Cuba), 2018. English. NNT : 2018PERP0055. tel-02133876 HAL Id: tel-02133876 https://tel.archives-ouvertes.fr/tel-02133876 Submitted on 20 May 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Délivré par UNIVERSITE DE PERPIGNAN VIA DOMITIA En co-tutelle avec Instituto “Pedro Kourí” de Medicina Tropical Préparée au sein de l’ED305 Energie Environnement Et des unités de recherche : IHPE UMR 5244 / Laboratorio de Malacología Spécialité : Biologie Présentée par Annia ALBA MENENDEZ Comparative biology of susceptible and naturally- resistant Pseudosuccinea columella snails to Fasciola hepatica (Trematoda) infection in Cuba: ecological, molecular and phenotypical aspects Soutenue le 12 décembre 2018 devant le jury composé de Mme. Christine COUSTAU, Rapporteur Directeur de Recherche CNRS, INRA Sophia Antipolis M. Philippe JARNE, Rapporteur Directeur de recherche CNRS, CEFE, Montpellier Mme. -
Introduction to Physidae (Gastropoda: Hygrophila); Biogeography, Classification, Morphology
Rev. Biol. Trop. 51 (Suppl. 1): 1-287, 2003 www.ucr.ac.cr www.ots.ac.cr www.ots.duke.edu Introduction to Physidae (Gastropoda: Hygrophila); biogeography, classification, morphology Dwight W. Taylor1 1 Mailing address: P.O. Box 5532, Eugene, Oregon 97405. Abstract: Physidae, a world-wide family of freshwater snails with about 80 species, are reclassified by pro- gressive characters of the penial complex (the terminal male reproductive system): form and composition of penial sheath and preputium, proportions and structure of penis, presence or absence of penial stylet, site of pore of penial canal, and number and insertions of penial retractor muscles. Observation of these characters, many not recognized previously, has been possible only by the technique used in anesthetizing, fixing, and preserving. These progressive characters are the principal basis of 23 genera, four grades and four clades within the family. The two established subfamilies are divided into seven new tribes including 11 new genera, with diagnoses and lists of species referred to each. Proposed as new are: in Aplexinae, Austrinautini, with Austrinauta g.n. and Caribnauta harryi g.n., nom.nov.; Aplexini; Amecanautini with Amecanauta jaliscoensis g.n., sp.n., Mexinauta g.n., and Mayabina g.n., with M. petenensis, polita, sanctijohannis, tempisquensis spp.nn., Tropinauta sinusdul- censis g.n., sp.n.; and Stenophysini, with Stenophysa spathidophallus sp.n.; in Physinae, Haitiini, with Haitia moreleti sp.n.; Physini, with Laurentiphysa chippevarum g.n., sp.n., Physa mirollii nom.nov.; and Physellini, with Chiapaphysa g.n., and C. grijalvae, C. pacifica spp.nn., Utahphysa g.n., Archiphysa g.n., with A. -
Evaluation of Heavy Metals in Tissue of Tympanotonus Fuscatus Sold in Some Markets in Port Harcourt Metropolis, Nigeria
MOJ Toxicology Research Article Open Access Evaluation of heavy metals in tissue of Tympanotonus fuscatus sold in some markets in Port Harcourt metropolis, Nigeria Abstract Volume 4 Issue 5 - 2018 Tympanotonus fuscatus is found in mangrove swamps of the coastal region of the Niger Delta Nigeria. It is a source of protein, Hence it is used in the preparation of Ayobami Omozemoje Aigberua,1 Sylvester delicacies. This study evaluated the level of heavy metals in tissues of Tympanotonus Chibueze Izah2 fuscatus sold in some markets in Port Harcourt, Rivers state, Nigeria. Triplicate 1Department of Chemical Sciences, Niger Delta University, samples of Tympanotonus fuscatus was purchased from seven different markets Nigeria within Port Harcourt metropolis. The samples were digested and analyzed using a 2Department of Biological Sciences, Niger Delta University, Flame atomic absorption spectrometer. Results showed that the concentration of Nigeria the heavy metals ranged from 0.76–1.56mg/kg (nickel), 22.36–29.28mg/kg (zinc), 185.07–921.49mg/kg (iron), 0.05–0.56mg/kg (lead), 80.96–102.62 mg/kg (cobalt) and Correspondence: Sylvester C Izah, Department of Biological 19.04–69.45 mg/kg (manganese). Moisture and organic matter contents ranged from Sciences, Faculty of Science, Niger Delta University, Wilberforce 78.88–85.87% and 86.06–92.23% respectively. Analysis of variance showed that there Island, Bayelsa State, Nigeria, Tel +2347030192466, is significant difference (P<0.05) in most of the locations for each of the parameters. Email [email protected] The variation that exists could be due to differences in the pollution load of the aquatic Received: December 22, 2017 | Published: September 25, habitats from which the samples were harvested. -
Molluscs at the Kafa Biosphere Reserve
NABU’s Biodiversity Assessment at the Kafa Biosphere Reserve, Ethiopia Molluscs at the Kafa Biosphere Reserve Thies Geertz 96 MOLLUSCS Highlights ´ As far as the author is aware, this is the first systematic assessment of terrestrial molluscs in an Ethiopian rainforest, if not the whole of Ethiopia. ´ A total of 32 species of terrestrial molluscs were recorded. ´ Knowledge of the ecology and conservation status of Ethiopian land snails is very poor at present. Further research is required to complete the checklist of land snails in the Kafa BR. ´ None of the recorded species has been assessed by the IUCN Red List. ´ Boginda Forest in the core zone was the most species-rich forest, with 16 recorded snail species. ´ Freshwater molluscan diversity is very poor in the Kafa BR, with only nine species recorded in rivers, streams and ponds. ´ One pea clam (Pisidium sp.) was discovered that is most probably new to science. Freshwater gastropods are absent from almost all investigated ponds and streams, despite seemingly good habitat conditions. This could be due to biogeographic factors or chemical water parameters and requires further research. ´ Freshwater mussels (Unionoida) would be a good indicator group for the ecosystem health of streams and rivers. ´ The carnivorous Streptaxidae are a potential indicator group for the ecological integrity of rainforests, although further research is required. ´ Molluscs face an unprecedented rate of extinction, with 83% of East African land snails restricted to the endangered rainforests. Further research and conservation measures to curb deforestation are urgently required if these species are to survive. ´ Future research should focus on identifying forest endemics in the Kafa BR, as these are potentially good indicator species and especially prone to extirpation. -
A Review on Persisting Threats to Snail's Diversity and Its Conservation Approaches
Archives of Agriculture and Environmental Science 5(2): 205-217 (2020) https://doi.org/10.26832/24566632.2020.0502019 This content is available online at AESA Archives of Agriculture and Environmental Science Journal homepage: journals.aesacademy.org/index.php/aaes e-ISSN: 2456-6632 REVIEW ARTICLE A review on persisting threats to snail’s diversity and its conservation approaches Varun Dhiman1* , Deepak Pant2, Dushyant Kumar Sharma3 and Prem Prakash4 1Waste Management Laboratory, School of Earth & Environmental Sciences, Central University of Himachal Pradesh, Shahpur - 176206 (Himachal Pradesh), INDIA 2School of Chemical Sciences, Central University of Haryana, Jant-Pali, Mahendergarh, Haryana-123031, INDIA 3Department of Tree improvement and Genetic resources, College of Horticulture and Forestry, Neri, Hamirpur (Himachal Pradesh) – 177001, INDIA 4Department of Silviculture and Agroforestry, College of Horticulture and Forestry, Neri, Hamirpur (Himachal Pradesh) – 177001, INDIA *Corresponding author’s E-mail: [email protected] ARTICLE HISTORY ABSTRACT Received: 24 March 2020 Snails are important part of our terrestrial, freshwater and marine ecosystems. They are Revised received: 15 May 2020 molluscian members having their effective role in biomonitoring, nutrient cycling and medici- Accepted: 26 May 2020 nal development. They are integral part of food chain system and have direct or indirect impact in maintaining ecological functioning. Besides their importance, they are documented with largest extinction rate as compared to other existed taxa. This is due to the fact that, Keywords unexploration and poor attention has been given in the research and development by the scientific world. Till now, a little information is available related to systematics, life history, Conservation Diversity population biology, threats and conservation status of these slimy organisms. -
Comparing the IUCN's EICAT and Red List to Improve
A peer-reviewed open-access journal NeoBiota 62: 509–523Comparing (2020) the IUCN’s EICAT and Red List to improve impact assessments 509 doi: 10.3897/neobiota.62.52623 RESEARCH ARTICLE NeoBiota http://neobiota.pensoft.net Advancing research on alien species and biological invasions Comparing the IUCN’s EICAT and Red List to improve assessments of the impact of biological invasions Dewidine Van der Colff1,2, Sabrina Kumschick1,2, Wendy Foden3,4, John R. U. Wilson1,2 1 South African National Biodiversity Institute, Kirstenbosch Research Centre, Cape Town, South Africa 2 Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Stellenbosch, South Africa 3 Cape Research Centre, South African National Parks, Tokai, 7947, Cape Town, South Africa 4 Global Change Biology Group, Department of Botany and Zoology, Stellenbosch University, South Africa Corresponding author: Dewidine Van der Colff ([email protected]) Academic editor: S. Bacher | Received 27 March 2020 | Accepted 13 August 2020 | Published 15 October 2020 Citation: Van der Colff D, Kumschick S, Foden W, Wilson JRU (2020) Comparing the IUCN’s EICAT and Red List to improve assessments of the impact of biological invasions. In: Wilson JR, Bacher S, Daehler CC, Groom QJ, Kumschick S, Lockwood JL, Robinson TB, Zengeya TA, Richardson DM (Eds) Frameworks used in Invasion Science. NeoBiota 62: 509–523. https://doi.org/10.3897/neobiota.62.52623 Abstract The IUCN recommends the use of two distinct schemes to assess the impacts of biological invasions on biodiversity at the species level. The IUCN Red List of Threatened Species (Red List) categorises native species based on their risk of extinction.