Publication
Publisher:
Forestry Association Of Nigeria
Publication Type:
Conference
Publication Title:
Extraction Of High-Quality Genomic DNA From Sterculia Rhinopetala For Microsatellite Analysis
Publication Authors:
Lawal A., Oladele, O. O. And Adekunle V.J.A.
Year Published:
2022
Abstract:
NAN
Publisher:
Tanzania Journal Of Forestry And Nature Conservation
Publication Type:
Journal
Publication Title:
Comparison Of Carbon Stock Estimation Methods And Carbon Storage In A Nigerian Strict Nature Reserve And Enrichment Planting Forest.
Publication Authors:
Lawal A., Adekunle V.A.J. And Akinkunmi T.F.
Year Published:
2021
Abstract:
Forest ecosystem is a major biological
scrubber of atmospheric carbon dioxide.
Deforestation and forest degradation could
lead to the depletion of the ozone layer by
greenhouse gasses. Unfortunately, research
efforts to estimate carbon stock potential in
natural forest and forest regenerated through
enrichment planting in Nigeria have not
been intensified. More so, researches on the
evaluation of non-destructive carbon stock
estimation methods are scarce. In this study,
systematic line transect was employed in the
laying of the plots. A total of 8 sample plots
under each of the selected forest types were
used. For above-ground biomass estimation,
two non-destructive methods were used. The
amount of carbon stock obtained using
model and densisty method was
significantly higher in strict nature reserve
(21,112.50 ton/ha, 161.93 ton/ha) than the
forest established through enrichment
planting (3,018.07 ton/ha, 88.96 ton/ha).
Findings from this study revealed that the
total above-ground life carbon stock
obtained using model was significantly
higher in the strict nature reserve and
enrichment planted Forest than the total
above-ground life carbon stock obtained
using density method. Since the estimated
carbon stock using density method is closer
to the average aboveground biomass carbon
estimated around 248 tC ha-1 for tropical
rainforest, it was considered more
appropriate for non-destructive carbon stock
estimation and therefore recommended
Publisher:
International Journal Of Genetics And Genomics.
Publication Type:
Journal
Publication Title:
Impact Of Anthropogenic Activities On Genetic Diversity Of Celtis Zenkeri Engl In South-West Nigeria
Publication Authors:
Fasalejo O., Lawal A., Adekunle V.A.J.
Year Published:
2021
Abstract:
Celtis zenkeri is a valuable tropical tree species for industrial and domestic purposes. For several years,
exploitation of this species has not been sustainable and no reforestation or cultivation effort has been put in place both by
governmental and non-governmental agencies. Anthropogenic activities have resulted in deforestation and subsequent
reduction in the population size of important timber species. The research aim was to determine the impact of anthropogenic
activities on genetic diversity of Celtis zenkeri in South-West Nigeria. Extensive sampling of Celtis zenkeri was carried out
in four natural forest ecosystems. Two pristine forests (SNR, Akure forest and Osun Osogbo sacred grove) and two
degraded forests (OA3 and Eda forest reserve). Young leaves were collected from each tree found in each site and
preserved with silica gel for molecular analysis. In all, 130 accessions were sampled and were analyzed with five
chloroplast microsatellite markers. In the result, allelic richness, which is a measure of genetic diversity and an indicator of
a population's long-term potential for adaptability and persistence, was significantly higher in the two pristine forests than
the two degraded forests. Statistically, a significant difference was not recorded for the observed heterozygosities (Ho) in
the population of Celtis zenkeri in the pristine forests (Queen’s plot and Osun-Osogbo Sacred Grove) and a degraded forest
(OA3). The formal indicates the possibility of conserving genetic diversity using traditional conservation approaches such
as taboos and restrictions. Though OA3 is a degraded forest, the impact of the anthropogenic activities may not have been
severe when compared with Eda forest reserve. At present, the scale of human activities in Eda forest reserve and OA3
could pose a serious threat to the future viability of the species if unchecked. Therefore, ex-situ conservation and
sustainable harvesting of Celtis zenkeri are recommended.
Publisher:
Journal Of Research In Forestry, Wildlife And Environment.
Publication Type:
Journal
Publication Title:
Genetic Diversity Of Adansonia Digitata (L.) And Vitelleria Paradoxa (C.F. Gaertn) In Nigeria.
Publication Authors:
Boboye O.M., Lawal A., And Oyerinde O.V
Year Published:
2021
Abstract:
This study evaluated the genetic diversity of Adansonia digitata and Vitelleria paradoxa in
three savanna ecological zones of Nigeria using ten microsatellite markers. Leaf samples were
collected from three savanna ecological zones of Nigeria. Genomic deoxyribonucleic acid
(DNA) was extracted from 0.020g powder of silica gel dried leaves using the modified Doyle
and Doyle (1990) protocol. Polymerase Chain Reaction (PCR) was performed in a volume of
25µl in a DNA thermal cycler. PCR products were separated by electrophoresis using 2%
agarose gel inTBE buffer. Fragment sizes were estimated using ladder DNA sizing marker
and analysed using CERVUS. Averagely high genetic diversity (He) was recorded for A.
digitata and V. paradoxa genotypes for Sudan Savanna (0.6572, 0.5792) and Guinea Savanna
(0.6050, 0.5302) but significantly higher in Derived Savanna ecological zone (0.8093, 0.7372).
A good strategy to protect these endangered tree species is to protect more of their habitat and
also to develop their plantation outside their natural habitat.
Publisher:
Tanzania Journal Of Forestry And Nature Conservation
Publication Type:
Journal
Publication Title:
Assessment Of The Conservation Values Of Osun Osogbo Sacred Grove, Osun State, Nigeria
Publication Authors:
20. Oladeji S.O., Osanyinleye G.D. And Lawal A.
Year Published:
2021
Abstract:
High Conservation Values (HCV) are unique
biological, critical ecosystem functions,
cultural significant features of an ecosystem.
Paucity of knowledge on HCV of Osun
Osogbo Sacred grove, South western Nigeria
is a serious consideration for this study. Data
was generated through field survey,
interview and direct field observation.
Interview was conducted for the priests,
grove staff and traditionalists while
systematic line transect was employed in the
laying of plots to establish abundance and
diversity of the flora species. Feeding point
count was carried out for the observation of
fauna species at a particular period of the
study. Cercopithecus mona recorded the
highest frequency compared to Guenon
cercopithecus erythrogaster. A total of forty
(40) tree species were found with Margalef
and Shannon-Weiner index of 19.20 and 2.30
respectively. Celtis zenkeri had the highest
relative density (13.04) followed by Colla
hispida (9.42). Thematic analysis of the
cultural significance revealed that use and
non-use values were attached to the
resources in the grove. Combined efforts of
government officials, community guards and
traditionalist were employed as conservation
mechanism. It is recommended that
assessment of high conservation value of the
forest should be based on information on
diversity of species, critical ecosystem
functions and services.
Publisher:
Forests And Forest Products Journal
Publication Type:
Journal
Publication Title:
Resolving Taxonomic Uncertainties In Khaya Genus Using Foliar Anatomic Traits
Publication Authors:
Lawal, A.
Year Published:
2021
Abstract:
Identification of species in the genus khaya based on morphology has always been done with some level of
uncertainties. Leaf is perhaps anatomically most varied organ of angiosperms and its anatomical variations often
agree with generic and specific lines. Anatomic characters of vegetative parts of flowering plants have been
successfully employed to solve taxonomic problems and for the elucidation of phylogenetic relationships. This
research, therefore, was designed to reveal folia anatomic structure in the three species of Khaya in Ondo State,
Nigeria and compare their folia anatomic characteristics towards resolving their taxonomic uncertainties. Leaflets
of three khaya species (K. grandifoliola, K. seneglensis and K. ivorensis) were collected from different locations in
Ondo State. Sizeable (7cm x 3cm) portions of the leaflets from each of the species were taken from the standard
median portion and to evaluate their folia anatomic structure. Findings from the study revealed that the three species
were dorsiventral and were similar for all the anatomical traits investigated except for upper cuticle thickness in
Khaya ivorensis which was significantly lower (15.33µmm) than other two species, Khaya grandifoliola
(18.00µmm) and Khaya senegalensis (17.33µmm). This is an indication that folia anatomic characteristics alone
could not be sufficiently used to resolve these taxonomic uncertainties in Khaya genus in Ondo State. Therefore,
combination of anatomic characteristics with morphological traits could resolve this uncertainty and as such,
recommended.
Publisher:
Journal Of Research In Forestry, Wildlife & Environment
Publication Type:
Journal
Publication Title:
Extraction Of High-Quality Genomic DNA From Mansonia Altissima For Microsatellite Analysis.
Publication Authors:
Lawal, A. And Agbator, V.E.
Year Published:
2021
Abstract:
This study was carried out to compare the deoxyribonucleic acid (DNA) extracted from fresh and
dry leaves of Mansonia altissima with DNA extracted from fresh and dry cambium of the same
species. Genomic DNA was extracted using Cetyltrimethylammonium bromide (CTAB) and DNA
quantification was done using a UV Spectrometer. From the results obtained, fresh leaf and dried
cambium samples had the highest DNA purity of 1.18 and 1.19 (at an absorbance ratio of
A260/280) and 1.15 and 1.11 (at an absorbance ratio of A260/230), respectively. DNA obtained from
dried leaf samples had the lowest purity. The samples from fresh leaf and dried cambium had the
highest concentrations of 56.77µg/ml and 55.27µg/ml respectively, while samples from fresh
cambium had the lowest concentration of 13.47µg/ml. Subsequently, samples from fresh leaf and
dried cambium exhibited the highest yields of 2.84µg and 2.77µg respectively, with samples from
fresh cambium having the lowest yield of 0.67µg. This research therefore showed that samples
from dried cambium exhibited considerably high DNA concentration and yield, and hence
recommended for use for further molecular studies of the high-canopy trees of Mansonia
altissima.
Publisher:
Journal Of Research In Forestry, Wildlife & Environment
Publication Type:
Journal
Publication Title:
Tree Species Diversity, Abundance, And Soil Physico-chemical Status Of PSP 29, Akure Forest Reserve, Ondo State, Nigeria.
Publication Authors:
Akindele T. F., Adekunle, V. A. J And Lawal, A.
Year Published:
2021
Abstract:
Protected area is one of the in-situ methods of conservation that are needed to be protected from human
anthropogenic activities. The Vulnerability and failure of protected areas to achieve their primary
function due to evidence of increasing challenges in and outside these areas have been a major challenge
to Sustainable Forest Management in Nigeria. This study was conducted to assess tree species diversity
and abundance in the Permanent Sampling Plot 29 (PSP29) of the Akure Forest Reserve and relate them
with the soil physicochemical status. Tree diversity and soil assessment provide direction for the
management of forest areas and protect forests from degradation and deforestation. Sample plots were
laid using the systematic line transect method. Four sampling plots of 50 m × 50 m were laid using
systematic line transect. The sample plots laid were also used for soil collection. Soils were collected at
three depths (0-15 cm, 15-30 cm and 30-45 cm) along the diagonal in each of the sample plot with the
aid of soil auger. A total of 12 soil samples were collected from the study area. A total 210 stems
distributed among 54 species and 25 families were enumerated in this study. The study area had a
Shannon weinner index of 3.44. Celtis zenkeri was the dominant trees species. The soil was found to be
moderately acidic. Correlation analysis indicated that Potassium and Cation Exchangeable Capacity
(CEC) significantly (P>0.05) influenced tree species diversity in the forest. When subjected to Principal
Component Analysis, Na, P, Clay content and pH were found to be the fundamental soil properties that
represented what determined the quality of trees in the study sites. The study therefore recommended
that the remaining protected areas should be safeguarded from anthropogenic activities and more
protected areas be established.
Publisher:
Tropical Ecology
Publication Type:
Journal
Publication Title:
Understory Species Diversity, Regeneration And Recruitment Potential Of Sacred Groves In South West Nigeria.
Publication Authors:
Onyekwelu J.C., Lawal A., Mosandl R., Stimm B. And Agbelade A.D.
Year Published:
2021
Abstract:
Global species extinction rates due to forest conversions are increasing. Ecologists, conservationists and governments have
adopted various conservation methods. Sacred grove is one conservation option that has gained attention in recent time. We
assessed understory species diversity, regeneration and recruitment potentials of four sacred groves in southwestern Nigeria.
Overstory tree species were inventoried in eight 800 m2
temporary sample plots, systematically laid along two transects of
1000 m each. Understory tree species were assessed in 100 m2
plots for saplings and 25 m2
plots for seedlings in all sample
plots. Shannon–Wiener diversity index (1.8–3.46 (overstory); 2.65–3.55 (understory)), number of species (32–58 (overstory);
39–78 (understory)) and tree density (309–417 individuals/ha (overstory); 775–1445 individuals/ha (understory)) were
comparable and/or higher at the understories than the overstories. Dbh distribution curves showed highest stand density at
the lowest class (10–20 cm) and decreased with increasing dbh, indicating good regeneration status and healthy ecosystem.
Regeneration was considered good and fair, because in most cases, number of seedlings>saplings>overstory trees or number
of .....
Publisher:
Forestry Research Institute Of Nigeria
Publication Type:
Journal
Publication Title:
Early Growth Rate Disparity In Indigenous And Exotic Tree Species In Nigeria.
Publication Authors:
Lawal, A. And Bakare, S.
Year Published:
2020
Abstract:
The hypothesis that exotic trees have a fast growth rate and a very short gestation period could
be responsible for their preference as plantation species in Nigeria. However, research to
ascertain this hypothesis has been limited to a very few indigenous tree species. In this study, early growth rate disparity (GRD) between nine indigenous and two exotic tree species were
compared. The seedlings used for this study were obtained from the Forestry Research Institute
of Nigeria (FRIN) Ibadan and Ondo State Forestry Department, Akure. The seedlings were
randomly planted on a well-prepared site at Federal University of Technology, Akure (FUTA)
using a 3m × 3m espacement with 10 replicates per species. Their initial height, collar diameter
and the number of leaves were recorded. The growth characteristics of the seedlings (total
height, collar diameter and the number of leaves) were monitored and enumerated fortnightly for
six months. The data collected were subjected to the analysis of variance (ANOVA) and means
were separated with Duncan New Multiple Range Test. In this study, the total height was found
to be significantly higher in Gmelina arborea (64.14cm), followed by Ceiba pentandra
(45.84cm), Tectona grandis (42.53cm) and Adansonia digitata (38.02cm). T. grandis had the
highest diameter growth (3.88cm), followed by G. arborea (3.65cm), C. pentandra (3.23cm) and
Cordia millenii (3.22cm). However, the number of leaves recorded for A. digitata (52.96) was
significantly higher than the number of leaves recorded for the exotic tree species. G. arborea
was found to be 28.53% faster in height growth than C. pentandra. It was 33.69%, 40.72%, 43.69%, 55.85%, 57.61%, 74.51%, 75.41%, 75.58% and 86.61% faster in height growth than T.
grandis, A. digitata, Nauclea didderichii, Triplochiton scleroxylon, C. millenii, Khaya
senegalensis, Mansonia altisima, Terminalia superba and T. africana, respectively. C.
pentandra, the second best after G. arborea, was found to be 7.22% and 17.06% faster in height
growth than T. grandis and A. digitata. The growth disparities among the tree species could be
attributed to their genetic makeup. Therefore, efforts should be geared towards enhancing the
growth rate of indigenous tree species.