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Invertebrates in Idoro Community, Akwa Ibom State, Nigeria

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Invertebrates in Idoro Community, Akwa Ibom State, Nigeria Asian Journal of Environment & Ecology 3(4): 1-8, 2017; Article no.AJEE.34392 ISSN: 2456-690X Evaluating the Abundance of Soil Macro- Invertebrates in Idoro Community, Akwa Ibom State, Nigeria I. K. Esenowo1*, N. I. Udoidung1, A. U. Akpan1, D. E. Archibong1 and I. I. Umoh1 1Department of Zoology, University of Uyo, Uyo, Akwa Ibom State, Nigeria. Authors’ contributions This work was carried out in collaboration between all authors. Author IKE wrote the first draft of the manuscript and the protocol. Author NIU managed the literature searches. Author DEA designed the study and performed the statistical analysis. Author IIU managed the analyses of the study. All authors read and approved the final manuscript. Article Information DOI: 10.9734/AJEE/2017/34392 Editor(s): (1) George Tsiamis, Assistant Professor of Environmental Microbiology, Department of Environmental and Natural Resources Management, University of Patras, Agrinio, Greece. Reviewers: (1) Gleidson Gimenes Rieff, Federal University of Rio Grande do Sul, Brazil. (2) Ibrahim, Yusuf El-Ladan, Umaru Musa ‘Yar-adua University, Nigeria. (3) Rodrigo Camara de Souza, Federal Rural University of Rio de Janeiro, Brazil. Complete Peer review History: http://www.sciencedomain.org/review-history/20328 Received 26th May 2017 Accepted 22nd July 2017 Original Research Article Published 3rd August 2017 ABSTRACT A comparative study of the influence of farmland and waste dump on the abundance and diversity of soil macro invertebrates in Idoro community of Uyo, Akwa Ibom State, Nigeria was investigated between September 2015 and February, 2016. Soil samples were randomly collected at near soil surface layer (10 cm x 10 cm) by extraction using hand trowel into sterile polythene bags. The samples were analysed for macro-invertebrates using standard methods. A total of 249 soil macro invertebrate representing (13) invertebrate taxa belonging to nine (9) orders from six (6) classes and three (3) phyla (comprising of Arthropoda, Mollusca and Annelida) were encountered. In the wastes dump site, 114 invertebrates were encountered, while 135 were encountered in the cultivated farmland, The overall abundance of soil macro invertebrate phyla in both sampling sites were as follows; waste dumpsite (Arthropoda (65.5%) > Mollusca (25.5%) > Annelida (13.4%) and Cultivated farm land (Arthropoda (96.8%) > Mollusca (1.5%) > Annelida (3.0%). In the waste dump site, the percentage abundance of macro invertebrates were Arthropod larvae with (27.1%), Blaniulus _____________________________________________________________________________________________________ *Corresponding author: E-mail: [email protected]; Esenowo et al.; AJEE, 3(4): 1-8, 2017; Article no.AJEE.34392 guttulatus (22.8%) followed by Pachychilidae sp. (21.1%), while the least were Hogna sp. (Wolf spider) (0.7%). In the cultivated farmland, the percentage abundance of the recorded taxa were Blaniulus guttulatus (millipede) (54.1%), followed by Asiomorpha coarctata (11.1%), Oniscidea sp., Formica rufa, Crytocerus puntulatus, Hogna sp. with (4.4%) respectively, while the least were Veronicella sp. and Oxidus gracilis (0.7%) respectively. Conclusively, the difference in the abundance and diversity of the soil invertebrates between the contrasting habitats could be attributed to land use pattern which have greatly impacted on the soil biotic community structure. Keywords: Macro-invertebrate; waste dump; diversity; abundance. 1. INTRODUCTION temperature, moisture, compaction [13,14], and acidity [15], as well as chemical features of soil Tropical soil macro-invertebrate communities are [14]. highly diverse and provide a number of important ecosystem services, including the maintenance The increasing trend in human populations and of soil structure, regulation of hydrological land use intensity have placed an urgent demand processes, nutrient cycling and decomposition on a better understanding of the effects of [1]. Unfortunately, the deterioration of soil quality, anthropogenic activities on soil quality and soil which often lead to decrease in the abundance of fauna at different spatial-temporal scales. This is vegetation, has serious consequences on this critically important to the conservation of global area, such as its use for the open waste biodiversity. According to Santorufo et al. [16] dumping, a fact that has recently arouse public highly polluted soil is composed of macro interest [2]. In developing countries, open waste invertebrate community dominated by few dumping has been a common practice due to low species well adapted to extreme conditions, operational cost and ability to take all kinds of whereas the moderately polluted soils may have wastes. a community composition made of more homogenous and therefore more tolerant to The term open dump is used to characterize a fluctuating conditions. land disposal site, where the indiscriminate A consistent presence of a rich organic layer of deposit of solid domestic waste takes place with soil provides a more stable place for soil macro- either no, or at best very little measures to invertebrates to live [17]. This creates a positive control the operation and to protect the feedback mechanism, where the healthier soil surrounding environment. This affects the promotes the presence of macro invertebrate physico-chemical properties of soil and surface populations, which in turn continue to convert water thereby posing serious threats to ground litter into nutrient rich soil. However, population water resources and soil ecosystem productivity numbers of soil macro-invertebrates varies in [3,4]. Hence an open dump is not in tune with the accordance with natural changes in season, increasing public awareness of environmental temperature, amount of rainfall, and other issues and the demand for environmental environmental gradients [18,19]. Furthermore, improvement including the current focus on human interference, such as open dumping of sustainability and global climate change [5]. waste can cause drastic changes to soil Changes in climatic condition together with soil invertebrate population [20]. Hence, the dearth of use can directly alter soil properties such as information on the effects of farmland and waste temperature, moisture content, chemical dump site on the distribution, abundance and composition, and physical properties. These diversity of soil macro invertebrates forms the alterations consequently influence soil macro- rationale for this study. The aim of this study is to invertebrate community assemblage, and in turn, investigate the abundance and diversity of soil alter important ecosystem services such as litter macro-invertebrates in two contrasting habitats in decomposition and nutrient cycling [6,7]. Idoro community of Akwa Ibom State, Nigeria. There are various factors influencing the 2. MATERIALS AND METHODS composition, relative abundances, and dynamics of soil fauna. These includes biotic interactions 2.1 Study Area such as competition [8] and predation [9-11]; the presence or absence of organic matter [12], This study was carried out in Idoro community in physical features of the soil environment such as Uyo Local Government Area of Akwa Ibom state, 2 Esenowo et al.; AJEE, 3(4): 1-8, 2017; Article no.AJEE.34392 Southern part of Nigeria. It lies between latitude 2.3 Sample Collection 5°2’51” North and longitude 8°2’41” East (Fig. 1). The climatic condition of the study area is that of Sample collections were carried out once in a a typical tropical region, characterized by both week for a period of six months between rainy and dry seasons, which ranges between September, 2015 to February 2016. Four Soil March to October and from November to March samples were randomly collected from each of respectively. The annual rainfall is about 2500 the study sites, at near soil surface layer (10 cm mm with a mean annual temperature of 32°C x 10 cm) by extraction using hand trowel into a and a relative humidity of 75%. The vegetation of well labelled polythene bag. The soils samples the study sites were characterized by a great were immediately transported to the laboratory variety of grasses (Panicum maximum), herbs for processing, sorted for the soil macro- (Aspilia africana), shrubs (Chromolaena odorata) invertebrates and identified using guides and trees (Mangifera indica). Soils types found provided by Borror and White [21]. The around the open dumpsite and fallowed farm are numbers of each arthropod were counted and of loamy soil and sandy loamy respectively. recorded. 2.2 Sampling Sites 2.4 Physico-chemical Parameters of Soils Two sampling sites (waste dump site and The soil from waste dumpsite and cultivated cultivated farmland) were selected to compare farmland were collected and placed in separate the influence of human activities on soil macro polythene bags and taken to Department of invertebrate abundance and diversity. The waste Animal and Environmental Biology for analysis. dumpsite is a traditional one, not approved by the Soil temperature and pH were determined in situ State Government. with the use of mercury in glass thermometer Fig. 1. Map of Uyo local government area of Akwa Ibom State showing the selected study area (Afaha Odoro) 3 Esenowo et al.; AJEE, 3(4): 1-8, 2017; Article no.AJEE.34392 and buffered electronic pH meter (Kent 7020) Table 2. A total of 249 soil macro invertebrate respectively, while soil moisture content was representing 13 taxa were encountered. In the determined according to the method given by cultivated farmland, 135 individuals
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