Morphological variation within Salvinia molesta D. S. Mitchell (Salviniaceae) populations in the Kinabatangan, Sabah
This study aimed to understand the principle of variation within the same species of plant, though it grew in a narrow environmental gradient area, such as the tropic. An aquatic fern species and has the potential to become a weed in the Sabah freshwater ecosystem was chose for this study: Salvin...
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | English |
| Published: |
2007
|
| Subjects: | |
| Online Access: | https://eprints.ums.edu.my/id/eprint/17634/1/Morphological%20variation%20within.pdf |
| _version_ | 1796909605980209152 |
|---|---|
| author | Ainon Hadim |
| author_facet | Ainon Hadim |
| author_sort | Ainon Hadim |
| collection | UMS |
| description | This study aimed to understand the principle of variation within the same species
of plant, though it grew in a narrow environmental gradient area, such as the
tropic. An aquatic fern species and has the potential to become a weed in the
Sabah freshwater ecosystem was chose for this study: Salvinia molesta D. S
Mitchell. Taxonomical and ecological informations of this species in Sabah were
still at the initial stage and very limited. The Lower Kinabatangan River is the
place when it was first recorded and became the focus area in this study.
Samples of S. molesta from twelve stations along the Lower Kinabatangan River
and three comparison stations from the Sandakan inland were analyzed to
determine morphological differences between: quadrates (within the same
population), between populations (from different stations), and between two types
of water bodies (open and closed water bodies). By considering the maximum
level of individual's maturity stage, the statistical analysis of One-way ANOVA
and t-test were used to compare the means of morphometric measurements and
meristic counts on six quantitative characters of this species. The quantitative
characters were from the vegetative structure (floating leaf length and width,
submerged leaf length, rhizome diameter) and reproductive structure (number of
fertile axis, number of sporocarps). All the samples analyzed showed that there
were morphological differences within the S. molesta populations in the study
area. Variation between quadrates was significant (p<0.001) within the S.
molesta populations with the size of more than five meter square. Variation
between populations along the Kinabatangan River resulted with a highly
significant (p<0.001) morphological differences from one stations to another.
Morphological differences for samples from the two type of water bodies (open
and closed water bodies) were also showed a highly significant (p<0.001)
different; samples from the open water body were bigger in sizes of leaves and
rhizome. Based on regression and correlation analysis, relationship between the
quantitative characters were positive and significant (p<0.01). However,
regression between the characters and the stations positioned showed that the
plants were bigger at the upper stream area. The cluster analysis of Ward's
method showed samples from the Sg. Koyah was a distinctive group among
others. No consistent morphological characters can be used to distinguish
between intraspecific populations of this species. The data obtained from this
present study agrees with the hypothesis that there was an intraspecific variation
occurred within the S. molesta populations in the Kinabatangan and rejected the
null hypothesis. This study also added evidence on S. molesta as a single
species of a highly morphological variability even in a narrow environmental
gradient area, such as the tropic. |
| first_indexed | 2024-03-06T02:52:36Z |
| format | Thesis |
| id | ums.eprints-17634 |
| institution | Universiti Malaysia Sabah |
| language | English |
| last_indexed | 2024-03-06T02:52:36Z |
| publishDate | 2007 |
| record_format | dspace |
| spelling | ums.eprints-176342017-11-23T05:14:31Z https://eprints.ums.edu.my/id/eprint/17634/ Morphological variation within Salvinia molesta D. S. Mitchell (Salviniaceae) populations in the Kinabatangan, Sabah Ainon Hadim QK Botany This study aimed to understand the principle of variation within the same species of plant, though it grew in a narrow environmental gradient area, such as the tropic. An aquatic fern species and has the potential to become a weed in the Sabah freshwater ecosystem was chose for this study: Salvinia molesta D. S Mitchell. Taxonomical and ecological informations of this species in Sabah were still at the initial stage and very limited. The Lower Kinabatangan River is the place when it was first recorded and became the focus area in this study. Samples of S. molesta from twelve stations along the Lower Kinabatangan River and three comparison stations from the Sandakan inland were analyzed to determine morphological differences between: quadrates (within the same population), between populations (from different stations), and between two types of water bodies (open and closed water bodies). By considering the maximum level of individual's maturity stage, the statistical analysis of One-way ANOVA and t-test were used to compare the means of morphometric measurements and meristic counts on six quantitative characters of this species. The quantitative characters were from the vegetative structure (floating leaf length and width, submerged leaf length, rhizome diameter) and reproductive structure (number of fertile axis, number of sporocarps). All the samples analyzed showed that there were morphological differences within the S. molesta populations in the study area. Variation between quadrates was significant (p<0.001) within the S. molesta populations with the size of more than five meter square. Variation between populations along the Kinabatangan River resulted with a highly significant (p<0.001) morphological differences from one stations to another. Morphological differences for samples from the two type of water bodies (open and closed water bodies) were also showed a highly significant (p<0.001) different; samples from the open water body were bigger in sizes of leaves and rhizome. Based on regression and correlation analysis, relationship between the quantitative characters were positive and significant (p<0.01). However, regression between the characters and the stations positioned showed that the plants were bigger at the upper stream area. The cluster analysis of Ward's method showed samples from the Sg. Koyah was a distinctive group among others. No consistent morphological characters can be used to distinguish between intraspecific populations of this species. The data obtained from this present study agrees with the hypothesis that there was an intraspecific variation occurred within the S. molesta populations in the Kinabatangan and rejected the null hypothesis. This study also added evidence on S. molesta as a single species of a highly morphological variability even in a narrow environmental gradient area, such as the tropic. 2007 Thesis NonPeerReviewed text en https://eprints.ums.edu.my/id/eprint/17634/1/Morphological%20variation%20within.pdf Ainon Hadim (2007) Morphological variation within Salvinia molesta D. S. Mitchell (Salviniaceae) populations in the Kinabatangan, Sabah. Masters thesis, Universiti Malaysia Sabah. |
| spellingShingle | QK Botany Ainon Hadim Morphological variation within Salvinia molesta D. S. Mitchell (Salviniaceae) populations in the Kinabatangan, Sabah |
| title | Morphological variation within
Salvinia molesta D. S. Mitchell (Salviniaceae)
populations in the Kinabatangan, Sabah |
| title_full | Morphological variation within
Salvinia molesta D. S. Mitchell (Salviniaceae)
populations in the Kinabatangan, Sabah |
| title_fullStr | Morphological variation within
Salvinia molesta D. S. Mitchell (Salviniaceae)
populations in the Kinabatangan, Sabah |
| title_full_unstemmed | Morphological variation within
Salvinia molesta D. S. Mitchell (Salviniaceae)
populations in the Kinabatangan, Sabah |
| title_short | Morphological variation within
Salvinia molesta D. S. Mitchell (Salviniaceae)
populations in the Kinabatangan, Sabah |
| title_sort | morphological variation within salvinia molesta d s mitchell salviniaceae populations in the kinabatangan sabah |
| topic | QK Botany |
| url | https://eprints.ums.edu.my/id/eprint/17634/1/Morphological%20variation%20within.pdf |
| work_keys_str_mv | AT ainonhadim morphologicalvariationwithinsalviniamolestadsmitchellsalviniaceaepopulationsinthekinabatangansabah |