PSU Knowledge Bank Community:
http://kb.psu.ac.th:80/psukb/handle/2010/5556
2024-03-28T21:17:56ZSEM studies on the radula of the marine shelled gastropods in the potamididae
http://kb.psu.ac.th:80/psukb/handle/2016/19362
Title: SEM studies on the radula of the marine shelled gastropods in the potamididae
Authors: Jintamas Suwanjarat
Abstract: The radular teeth of Telescopium telescopium, Cerithidea obtusa, Cerithidea cingulata and Cerithidea rhizoporarum in Potamididae have been studied by SEM. They are taenioglossate. Each row of radular teeth of Telescopium telescopium and Cerithidea cingulata consists of seven primary teeth, while those of Cerithidea obtusa and Cerithidea rhizoporarum have nine primary teeth. The four species are similar in that the rachidian has a prominent median cusp and the laterals have spatula shaped main cusps which are much larger than the denticles flanked on each side Cerithidea rhizoporarum differs from the other Potamididae studied in the reduction of the central tooth. The difference of cusp arrangement is found in the inner and outer flanking denticles of the lateral teeth among these Potamididae. The marginal teeth of Cerithidea obtusa and Cerithidea rhizoporarum are essentially identical, while those of Telescopium telescopium and Cerithidea cingulata are different.
Morphological variation of the radula was not found in this study, but it is too early to conclude that there is no intraspecies variation of the radular element of these species. It is suggested that further investigation in order to compare the radula of the Potamidid snails from different areas is necessary.1993-01-01T00:00:00ZEffects of age on calling and mating behavior or the sapodilla fruit borer, Nepthopterix sp.(Lepidoptera : Pyralidae) / Boongeua Witethom
http://kb.psu.ac.th:80/psukb/handle/2016/19356
Title: Effects of age on calling and mating behavior or the sapodilla fruit borer, Nepthopterix sp.(Lepidoptera : Pyralidae) / Boongeua Witethom
Authors: Boongeua Witethom
Abstract: The calling and mating behavior of Nephopterix moths was observed in the laboratory. The patterns of calling and mating behavior varied with age. Moths were most likely to call and mate when 2 to 5 days old. The effects of age on the onset of calling and the time spent calling were non-linear. The onset of mating also changed non-linearly with age, but time spent mating linearly decreased with age. It appears that the change of calling and mating patterns with age is correlated with increased reproductive maturity of females.
Key words Nephopterix, sapodilla fruit borer, Pyralidae, calling behavior, mating behavior, sex pheromone1991-01-01T00:00:00ZEffects of Salinity on Distribution of Alien Invasive and Indigenous Byssally-attached Bivalves in the Songkhla Lake Basin
http://kb.psu.ac.th:80/psukb/handle/2016/19327
Title: Effects of Salinity on Distribution of Alien Invasive and Indigenous Byssally-attached Bivalves in the Songkhla Lake Basin
Authors: Nattacha Khanthasimachalerm
Abstract: Mytilopsis sallei (Récluz, 1849) and Mytella strigata (Hanley, 1843) are
alien invasive byssally-attached bivalves that invaded Songkhla Lake which is a part of
the largest lagoon system in Thailand. Another bivalve, a native Perna viridis
(Linnaeus, 1758) was commonly found in the lake before, but it has been very rare in
recent years, instead it occurs seasonally on the coast near the mouth of the lake. This
work investigated distribution pattern and recruitment variability of these dominant
bivalves in the Songkhla Lake with a focus on the effects of salinity which fluctuates
greatly in this estuarine system. Growth rate, condition index and survival of juvenile
bivalves rearing at different salinities (0, 20, 35) were also monitored to examine
mechanisms influencing distribution of these bivalves. Spatial pattern of bivalve
recruitment and adult distributions were congruent. Recruits of M. sallei and adults
were found at salinities ranging from freshwater to mid-range salinity. M. strigata
recruited at salinities from brackish to saline condition, where the adults were present.
Recruits and adults of P. viridis were found at the mouth of the lake and on the shore
of the Gulf of Thailand where salinity was high. Observations around the lake also
showed that the distribution of the adult bivalves changed due to the seasonal variations
of salinity in the lake. M. strigata and P. viridis seemed to migrate to the inner part of
the lake when salinity became higher. From the experiment, M. sallei survived at all
salinities and having the highest condition index at salinity 35. M. strigata and P. viridis
survived only at salinity 20 and 35. The study suggests that salinity is the key factor
influencing recruitment process that regulates distribution of the dominant byssallyattached bivalves in this estuarine system
Description: Master of Science in Biology (International Program), 20232023-01-01T00:00:00Zกายวิภาคศาสตร์ใบและสัณฐานวิทยาเรณูของพืชสกุลตําหยาว (วงศ์กระดังงา) ในประเทศไทย
http://kb.psu.ac.th:80/psukb/handle/2016/19217
Title: กายวิภาคศาสตร์ใบและสัณฐานวิทยาเรณูของพืชสกุลตําหยาว (วงศ์กระดังงา) ในประเทศไทย
Authors: อริสา สมพรหม
Abstract: Leaf epidermal anatomy and pollen morphology of the genus Alphonsea Hook.f. & Thomson in Thailand were studied. The comparative anatomy of leaf in 15 species by the peeling method. The common characteristics are as follows: There are two types of epidermal cell shape are amorphous with sinuate anticlinal walls and jigsaw-like with cleft concave anticlinal walls. Two stomatal types are paracytic and para-tetracytic. Stomatal length ranges from 21.15±1.69 to 26.85±2.30 micrometers. The stomatal density varies from 155.00±23.21 to 373.00±88.58 stomata per area. The stomatal index varies from 12.60±1.87 to 19.41±0.77%. Two types of crystal are druse and prismatic crystal. One type of hair is multicellular, which is found in most species of uniseriate hair. The comparative anatomy of the leaf by paraffin technique of the leaf blade and petiole is as follows: most of the plants that were examined have one cell layer in the upper epidermis. Only one species has 1-2 cell layers. The height of a cell ranges from 12.50 to 42.50 micrometers. The epidermal cell of the midrib of most plants has 1-2 cell layers; six species have only one cell layer. The height of a cell ranges from 5.00-37.50 micrometers. There is only one cell layer on the lower epidermis of the leaf blade and midrib. Leaf blade: the height of a cell ranges from 17.50 to 12.50 micrometers. Midrib: the height of a cell ranges from 5.00 to 12.50 micrometers. Two types of leaf margins are curve downward and straight leaf margins. All the plants studied had thick cuticles. Vascular tissue is a collateral vascular bundle. An overview of the vascular bundle has two characteristics are viewed in a heart-like and semicircular shape. Four types of petiole shape in cross section are terete, cordate, semi-terete, and butterfly-like.
The pollen morphology of 14 species in the genus Alphonsea were observed by using light and scanning electron microscopes. The common characters of pollen are monad, apolar, radial symmetry and inaperturate. The length of the average diameter is between 41.00±1.75 to 50.00±3.33 micrometers. The shape of pollen is spheroidal. The exine is thick and ranges 1.38±0.40 to 3.50±1.29 micrometers. Three types of exine ornamentation are fossulate, rugulate, and fossulate mixed with scabrate. This study revealed the following results: the leaf anatomy of the genus can help identify species with similar external morphology. Study of the pollen morphology of plants in this genus cannot be clearly identified the species level, although a pattern on exine ornamentation can be used to classify plants into 3 groups. Therefore, the investigation of leaf anatomy and pollen morphology in the genus Alphonsea in Thailand can be applied to support the taxonomic and other studies into more complete knowledge.
Description: วิทยาศาสตรมหาบัณฑิต (ชีววิทยา (นานาชาติ)), 25662023-01-01T00:00:00Z