West African Journal of Applied Ecology最新文献_第3页

Vascular Hydrophytes for Bioassay of Phosphate Enrichment in Fresh Waters: A Pilot Study 用于淡水中磷酸盐富集生物测定的维管水生植物:一项初步研究

West African Journal of Applied Ecology Pub Date : 2011-10-05 DOI: 10.4314/WAJAE.V18I1.70311

T. Mahami, R. Goulder

引用次数: 0

Length-Weight Relationship and Growth Parameters of Grey Mullets (Pisces: Mugilidae) in Two Estuaries in Ghana 加纳两个河口灰鲻鱼(双鱼座:鲻科)的长重关系和生长参数

West African Journal of Applied Ecology Pub Date : 2011-10-05 DOI: 10.4314/WAJAE.V18I1.70309

R. Dankwa

{"title":"Length-Weight Relationship and Growth Parameters of Grey Mullets (Pisces: Mugilidae) in Two Estuaries in Ghana","authors":"R. Dankwa","doi":"10.4314/WAJAE.V18I1.70309","DOIUrl":"https://doi.org/10.4314/WAJAE.V18I1.70309","url":null,"abstract":"Grey mullet populations in the rivers Pra and Volta estuaries in Ghana were studied to provide information on their length-weight relationship and growth parameters. Fish samples were collected monthly for 18 months from local fishermen using cast net, drag net and gill nets. Six species of grey mullets were identified: sickle fin mullet, Liza falcipinnis (Valenciennes, 1836), large-scaled mullet, Liza grandisquamis (Valenciennes, 1836), grooved mullet, Liza dumerilii (Steindachner, 1870), white mullet, Mugil curema Vallenciennes, 1836, banana mullet, Mugil bananensis (Pellegrin, 1928) and striped mullet, Mugil cephalus Linnaeus, 1758. Length-weight relationship for the various species in the Volta and Pra estuaries, respectively, were: L. falcipinnis , BW = 0.0158 SL3.06 and BW = 0.0255 SL2.85; L dumerillii , BW = 0098 SL3.24 and BW = 0.0223SL2.92; M. bananensis , BW = 0.0191SL3.03 and BW = 0.0175 SL3.10; M. cephalus , BW = 0.0574 SL3.14 and BW = 0.0134 SL3.17; M. curema , BW = 0.0311 SL2.85 and BW = 0.0247 SL2.5. That for L. grandisquamis , which was found only in the Pra estuary, was BW = 0.0204 SL3.01, indicating isometric growth since the regression coefficient b was not significantly different from 3.0 (P > 0.05). The regression coefficient b for the other species was either significantly higher or lower than 3.0 (P < 0.01), suggesting allometric growth. Except L. dumerilli , L¥ and K for the same species from the two estuaries differed. The highest L¥ of 56.6 cm (SL) and growth performance index (∅) of 4.99 were estimated for M. cephalus . The L¥ estimated in the study indicates that the sizes of grey mullets in the two estuaries were smaller compared to the same species from other countries in the tropics.","PeriodicalId":39286,"journal":{"name":"West African Journal of Applied Ecology","volume":"18 1","pages":"53-61"},"PeriodicalIF":0.0,"publicationDate":"2011-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4314/WAJAE.V18I1.70309","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70693910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Floral Diversity in the Wetlands of Apete River, Eleyele Lake and Oba Dam in Ibadan, Nigeria: Its Implication for Biodiversity Erosion 尼日利亚伊巴丹Apete河、Eleyele湖和Oba坝湿地植物多样性及其对生物多样性侵蚀的影响

West African Journal of Applied Ecology Pub Date : 2011-10-05 DOI: 10.4314/WAJAE.V18I1.70319

O. Olubode, R. Awodoyin, S. Ogunyemi

{"title":"Floral Diversity in the Wetlands of Apete River, Eleyele Lake and Oba Dam in Ibadan, Nigeria: Its Implication for Biodiversity Erosion","authors":"O. Olubode, R. Awodoyin, S. Ogunyemi","doi":"10.4314/WAJAE.V18I1.70319","DOIUrl":"https://doi.org/10.4314/WAJAE.V18I1.70319","url":null,"abstract":"Wetlands in Nigeria face constant threat of destruction by urbanization, road construction and agricultural activities, but the floristic compositions of these fragmented communities are unknown. A comparative assessment study of the floral of three wetlands in a forest-savanna transition ecological zone, Ibadan (70261 N, 30541 E), Oyo State, Nigeria was conducted in the dry and wet seasons of 2002 to assess their species richness, density, community structure and diversity. Thirty-eight plant species from 19 families were enumerated in the three wetlands in two seasons. Nineteen species from 13 families were enumerated in the dry season, while 14 species belonging to nine families were enumerated in the wet season. Eight families were common to both seasons. Eleyele and Apete wetlands had relatively stable flora for both seasons, while Oba dam exhibited pronounced shift in flora between the dry and wet seasons. Continuous perturbation of the three wetlands encouraged proliferation and dominance of some invasive species at the expense of indigenous species populations, leading to subtle biodiversity erosion.","PeriodicalId":39286,"journal":{"name":"West African Journal of Applied Ecology","volume":"18 1","pages":"109-119"},"PeriodicalIF":0.0,"publicationDate":"2011-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4314/WAJAE.V18I1.70319","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70693682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Prevalence of Snail Vectors of Schistosomiasis in the Kpong Head Pond, Ghana 加纳Kpong Head池塘血吸虫病蜗牛病媒流行情况

West African Journal of Applied Ecology Pub Date : 2011-09-05 DOI: 10.4314/WAJAE.V18I1.70310

D. Yirenya-Tawiah, A. Rashid, G. Futagbi, I. F. Aboagye, M. Dadé

{"title":"Prevalence of Snail Vectors of Schistosomiasis in the Kpong Head Pond, Ghana","authors":"D. Yirenya-Tawiah, A. Rashid, G. Futagbi, I. F. Aboagye, M. Dadé","doi":"10.4314/WAJAE.V18I1.70310","DOIUrl":"https://doi.org/10.4314/WAJAE.V18I1.70310","url":null,"abstract":"Schistosomiasis, a parasitic disease caused by the blood fluke Schistosoma sp. became a serious public health problem in Ghana after the Volta River was dammed in Akosombo in 1964. The formation of the Kpong head pond, about 25 km below the Akosombo dam, as a result of a second dam built at Kpong became an active schistosomiasis transmission site. The Volta River Authority (VRA) recently began an initiative of combining manual clearing of aquatic vegetation with chemotherapy as a way of managing the disease. However, no scientific monitoring of the effect of aquatic weed clearing on the vector population is being conducted. The study was initiated in the Kpong head pond to provide baseline data for subsequent monitoring and impact assessment of the initiative. It involved sampling of the banks of the head pond for aquatic snails at six different sampling sites of 1 m2 each, chosen at 100 m interval along the shoreline. Physicochemical factors which affect aquatic snail population were also determined. Aquatic snails sampled were Bulinus truncatus , Bulinus globosus , Biomphalaria pfeifferi , Melanoides spp, Physa waterlotti and Pila sp. where the first three are intermediate host of the schistosoma parasite. The study revealed B. truncates as the most frequent occurring vector (71.0%), followed by Biomphalaria (12.0%) and B. globosus (6.1%) The mean numbers of vector snails sampled per m2 were B. Truncates 61/m2, B. globosus 5/m2, and B. pfeifferi 11/m2. The presence of aquatic weeds and favourable physicochemical conditions of the water were found to provide a conducive environment for the vectors to thrive and hence sustain schistosomiasis transmission in the head pond. It is, therefore, recommended that a 5-year period of studies be undertaken to assess the impact of manual clearing of aquatic weeds on the snail population.","PeriodicalId":39286,"journal":{"name":"West African Journal of Applied Ecology","volume":"18 1","pages":"39-45"},"PeriodicalIF":0.0,"publicationDate":"2011-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4314/WAJAE.V18I1.70310","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70693929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 27

Records of Diatoms and Physicochemical Parameters of Seasonal Ponds in Zaria- Northern Nigeria 尼日利亚北部扎里亚季节池塘硅藻记录及理化参数

West African Journal of Applied Ecology Pub Date : 2011-09-05 DOI: 10.4314/WAJAE.V18I1.70314

A. Chia, S. Bako, .. S.O.Alonge, A. Adamu

引用次数: 7

The Boabeng-Fiema Monkey Sanctuary, Ghana: a case for blending traditional and introduced wildlife conservation systems. 加纳的Boabeng-Fiema猴子保护区:一个融合传统和引进的野生动物保护系统的案例。

West African Journal of Applied Ecology Pub Date : 2010-07-01 DOI: 10.4314/WAJAE.V17I1.65132

D. Attuquayefio, S. Gyampoh

{"title":"The Boabeng-Fiema Monkey Sanctuary, Ghana: a case for blending traditional and introduced wildlife conservation systems.","authors":"D. Attuquayefio, S. Gyampoh","doi":"10.4314/WAJAE.V17I1.65132","DOIUrl":"https://doi.org/10.4314/WAJAE.V17I1.65132","url":null,"abstract":"The introduction of nationally-managed “western”-style protected area systems in Africa often led to antagonism between government authorities and local communities, because rural communities, which were largely excluded and displaced, often resorted to unsustainable activities like encroachment for settlement, illegal hunting and farming. It is the view of most biodiversity conservationists, however, that the management of natural resources must take into consideration both the introduced “western” model and traditional or local knowledge. The study aimed at assessing the Boabeng-Fiema Monkey Sanctuary in Ghana, as an example of blending traditional and introduced wildlife conservation systems, using interviews and questionnaire to obtain information from a cross-section of inhabitants of the area. The results indicated that the dual management system in operation at present has been largely successful, as the inhabitants appear to support the mechanisms put in place to manage the Sanctuary. Policy recommendations proposed to further enhance this success are in the areas of research and monitoring, education and awareness, tourism improvement, and introduction of community incentive schemes.","PeriodicalId":39286,"journal":{"name":"West African Journal of Applied Ecology","volume":"17 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2010-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70693433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 27

Hunting Intensity in the Suhuma Forest Reserve in the Sefwi Wiawso District of the Western Region of Ghana: A Threat to Biodiversity Conservation 加纳西部地区Sefwi Wiawso地区Suhuma森林保护区的狩猎强度:对生物多样性保护的威胁

West African Journal of Applied Ecology Pub Date : 2010-07-01 DOI: 10.4314/WAJAE.V17I1.65142

B. Ofori, D. Attuquayefio

{"title":"Hunting Intensity in the Suhuma Forest Reserve in the Sefwi Wiawso District of the Western Region of Ghana: A Threat to Biodiversity Conservation","authors":"B. Ofori, D. Attuquayefio","doi":"10.4314/WAJAE.V17I1.65142","DOIUrl":"https://doi.org/10.4314/WAJAE.V17I1.65142","url":null,"abstract":"Hunting intensity in the Suhuma Forest Reserve (SFR) in the Sefwi Wiawso District of the Western Region of Ghana has been investigated. The methodology involved the recording of signs of hunting activity using linetransects, and interviews with hunters. A total of 157 spent cartridges, 21 wire snares, presence of 17 hunters, four hunting camps, and two gunshots were recorded over a total of 14 km of transects walked. Ten species of mammals were hunted, notably the brush-tailed porcupine ( Atherurus africanus) , Pel’s flying squirrel (Anomalurus peli) , long-tailed pangolin ( Uromanis tetradactyla) , giant rat ( Cricetomys gambianus ), Maxwell’s duiker ( Cephalophus maxwelli) , bushbuck ( Tragelaphus scriptus ), bay duiker ( Cephalophus dorsalis ), royal antelope ( Neotragus pygmaeus ), western tree hyrax ( Dendrohyrax dorsalis ), and grasscutter ( Thryonomys swinderianus ). Wire snares and shotguns were the two main hunting methods employed, the former being used by all, and the latter by 34% of the hunters interviewed. Between 60 and 200 wire traps were set by each hunter. The results indicated a high hunting intensity in the Suhuma Forest Reserve. Some corrective measures have been recommended to ameliorate the problem. These measures include the initiation of public education and awareness programmes, establishment of task forces to check bushmeat hunting, execution of stricter law enforcement, and more punitive sanctions for offenders.","PeriodicalId":39286,"journal":{"name":"West African Journal of Applied Ecology","volume":"17 1","pages":"135-142"},"PeriodicalIF":0.0,"publicationDate":"2010-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70693861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Integrated Organic-Inorganic Fertilizer Management for Rice Production on the Vertisols of the Accra Plains of Ghana 加纳阿克拉平原垂直土壤水稻有机无机肥料综合管理

West African Journal of Applied Ecology Pub Date : 2010-06-25 DOI: 10.4314/WAJAE.V16I1.55866

K. Nyalemegbe, Jw Oteng, S. Asuming-brempong

{"title":"Integrated Organic-Inorganic Fertilizer Management for Rice Production on the Vertisols of the Accra Plains of Ghana","authors":"K. Nyalemegbe, Jw Oteng, S. Asuming-brempong","doi":"10.4314/WAJAE.V16I1.55866","DOIUrl":"https://doi.org/10.4314/WAJAE.V16I1.55866","url":null,"abstract":"Studies were conducted at the Agricultural Research Centre, Kpong, of the University of Ghana, to find solution to the problem of low rice yields on the Vertisols of the Accra Plains. Rice yields from continuously cropped fields have been observed to decline with time, even with the application of recommended levels of inorganic fertilizers. The decline in yield has been attributed to low inherent soil fertility, which is partly the result of low levels of soil organic matter (OM). As part of the study, cow dung (CD) and poultry manure (PM) were separately applied to the soil at 20 t ha-1 solely and also 5, 10 and 15 t ha-1, in combination with urea fertilizer at 90, 60 and 30 kg N ha-1, respectively. Other treatments included a control and urea fertilizer at 30, 60, 90 and 120 kg N ha-1. There was a basal application of phosphorus and potassium to all plots at 45 kg P2O5 ha-1 and 35 kg K2O ha-1, respectively, based on the recommended fertilizer rate of 90 kg N ha-1, 45 kg P2O5 ha- 1 and 35 kg K2O ha-1, on the Vertisols of the Accra Plains. Studies were also conducted on the redox potential of CD, PM and rice straw (RS). The application of 10 t ha-1 CD and urea fertilizer (at 45 kg N ha-1) and 10 t ha-1 PM and urea (at 60 kg N ha-1) both gave paddy yields of 4.7 t ha-1, which did not differ significantly from the yield of 5.3 t ha-1, obtained under the recommended inorganic nitrogen fertilizer application of 90 kg N ha-1. This indicates a synergistic effect of OM and urea on soil fertility. The redox potential studies showed that RS had greater propensity to bring about reduced soil condition in paddy fields than CD and PM, while PM brought about greater reduction than CD.","PeriodicalId":39286,"journal":{"name":"West African Journal of Applied Ecology","volume":"16 1","pages":"23-31"},"PeriodicalIF":0.0,"publicationDate":"2010-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4314/WAJAE.V16I1.55866","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70685503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 28

Trace metal levels in water and sediment from the Sakumo II and Muni lagoons, Ghana 加纳Sakumo II和Muni泻湖水和沉积物中的痕量金属水平

West African Journal of Applied Ecology Pub Date : 2010-06-25 DOI: 10.4314/WAJAE.V16I1.55870

C. Tay, R. Asmah, C. Biney

引用次数: 36

Quality Protein Maize Response to Nitrogen Rate and Plant Density in the Guinea Savanna Zone of Ghana 加纳几内亚稀树草原优质蛋白玉米对施氮量和植株密度的响应

West African Journal of Applied Ecology Pub Date : 2010-06-25 DOI: 10.4314/WAJAE.V16I1.55865

S. Buah, L. N. Abatania, G. Aflakpui

{"title":"Quality Protein Maize Response to Nitrogen Rate and Plant Density in the Guinea Savanna Zone of Ghana","authors":"S. Buah, L. N. Abatania, G. Aflakpui","doi":"10.4314/WAJAE.V16I1.55865","DOIUrl":"https://doi.org/10.4314/WAJAE.V16I1.55865","url":null,"abstract":"Field experiments were conducted in the Guinea savanna ecology of Ghana to evaluate yield response of quality protein maize ( Zea mays L.) hybrid to plant density and nitrogen (N) fertilizer. The experiments were conducted at four locations on 16 farmers’ fields in 2002 and 2003. Three N rates (0, 90 and 135 kg/ha) were combined with three plant densities (50 000, 62 500 and 71 400 plants/ha) to constitute nine treatments which were tested in a randomized complete block design. Optimal N rate was not affected by plant density. There was no yield response to plant density. However, grain yield had a linear and quadratic response to N at all sites. Grain yield increases as a result of 90 kg N/ha applied over the farmers’ practice (0 kg N/ha) at Tumu, Jirapa, Kpongu and Wa were 39%, 85%, 101% and 303% in 2002, respectively. Grain yield increases for the same rate and sites in 2003 were 31%, 83%, 63% and 51%, respectively. Marginal rate of return (MMR) to 90 kg N/ha combined with 62 600 plants/ha was the highest (5564%). Increasing N rate beyond 90 kg/ha did not result in corresponding increase in yield nor net benefit to merit the extra cost that may be incurred. From the study, application of 90 kg N/ha to hybrid maize would give economic yield response and acceptable returns at low risk to farmers, regardless of plant density.","PeriodicalId":39286,"journal":{"name":"West African Journal of Applied Ecology","volume":"16 1","pages":"9-21"},"PeriodicalIF":0.0,"publicationDate":"2010-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4314/WAJAE.V16I1.55865","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70685615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18