Chulalongkorn University Theses and Dissertations (Chula ETD)
Other Title (Parallel Title in Other Language of ETD)
Comparative feeding ecology between Nuchequula gerreoides (Bleeker, 1851) and Eubleekeria splendens (Cuvier, 1829) from Pranburi river estuary, Thailand
Year (A.D.)
2018
Document Type
Thesis
First Advisor
เจษฎ์ เกษตระทัต
Second Advisor
วรรณีย์ จิรอังกูรสกุล
Faculty/College
Faculty of Science (คณะวิทยาศาสตร์)
Department (if any)
Department of Marine Science (ภาควิชาวิทยาศาสตร์ทางทะเล)
Degree Name
วิทยาศาสตรมหาบัณฑิต
Degree Level
ปริญญาโท
Degree Discipline
วิทยาศาสตร์ทางทะเล
DOI
10.58837/CHULA.THE.2018.1147
Abstract
Description of the resource partitioning (or niche differentiation) among fish is an essential part of substantial difference in a resources used for coexisting species for reducing competition. Food and reproductive activity are the most important factor concerning the resource partitioning among fishes. Decorated ponyfish (Nuchequula gerreoides) and splendid ponyfish (Eubleekeria splendens) are the two abundantly co-occurring leiognathid’s species in the Pranburi river estuary. The coexistence of these two species may promote resource partitioning. To examine this hypothesis, two important ponyfishes were collected from the Pranburi river estuary in this study. All fish specimens collection were carried out during dry (February to April) and rainy seasons (September to November) 2017. Several methods including morphometry, reproductive biology in relation to size distribution and stomach content analyses were compared to assess the extent of niche overlap and coexistence between fish species. Nuchequula gerreoides was significantly different (p<0.05), from Eubleekeria splendens in most morphometric traits with exception to total length and standard length. The analysis of the reproductive features of these fishes was shared between the morphology and histology. All female were classified juvenile due to the fact that only undeveloped stages (stage 0) were found in the ovary, while male below 3.4 cm is all juvenile individual and male above 3.4 cm only consists of mature individuals which were related to the early spermatogenic stage (stage 1). Measurable characteristics and digestive system, found that there are similarities between both ponyfishes except the gill raker and intestinal coefficient. Based on the intestinal coefficient of 1.08±0.01 (N. gerreiode) and 2.16±0.02 (E. splendens). N. gerroides occupied different feeding type from E. splendens. Based on IRI, The two species shared the main food items especially zooplankton (crustacean group). It was possible that the prey selection strategy might be relied on the season, the body size distribution and the food density in the natural environment. The feeding habit of the two species follows of the optimal foraging theory. Niche partitioning between N. gerroides and E. splendens were shown by seasonal shifts in relative importance of different components in diets. Niche overall indices suggested niches overlap and coexistence through diet partitioning, temporal partitioning and spatial partitioning. The larvae of these two ponyfishes do not found in this study. In short, these two fish species were marine migrant species which use the Pranburi river estuary as a nursery for juvenile fish.
Other Abstract (Other language abstract of ETD)
Description of the resource partitioning (or niche differentiation) among fish is an essential part of substantial difference in a resources used for coexisting species for reducing competition. Food and reproductive activity are the most important factor concerning the resource partitioning among fishes. Decorated ponyfish (Nuchequula gerreoides) and splendid ponyfish (Eubleekeria splendens) are the two abundantly co-occurring leiognathid’s species in the Pranburi river estuary. The coexistence of these two species may promote resource partitioning. To examine this hypothesis, two important ponyfishes were collected from the Pranburi river estuary in this study. All fish specimens collection were carried out during dry (February to April) and rainy seasons (September to November) 2017. Several methods including morphometry, reproductive biology in relation to size distribution and stomach content analyses were compared to assess the extent of niche overlap and coexistence between fish species. Nuchequula gerreoides was significantly different (p<0.05), from Eubleekeria splendens in most morphometric traits with exception to total length and standard length. The analysis of the reproductive features of these fishes was shared between the morphology and histology. All female were classified juvenile due to the fact that only undeveloped stages (stage 0) were found in the ovary, while male below 3.4 cm is all juvenile individual and male above 3.4 cm only consists of mature individuals which were related to the early spermatogenic stage (stage 1). Measurable characteristics and digestive system, found that there are similarities between both ponyfishes except the gill raker and intestinal coefficient. Based on the intestinal coefficient of 1.08±0.01 (N. gerreiode) and 2.16±0.02 (E. splendens). N. gerroides occupied different feeding type from E. splendens. Based on IRI, The two species shared the main food items especially zooplankton (crustacean group). It was possible that the prey selection strategy might be relied on the season, the body size distribution and the food density in the natural environment. The feeding habit of the two species follows of the optimal foraging theory. Niche partitioning between N. gerroides and E. splendens were shown by seasonal shifts in relative importance of different components in diets. Niche overall indices suggested niches overlap and coexistence through diet partitioning, temporal partitioning and spatial partitioning. The larvae of these two ponyfishes do not found in this study. In short, these two fish species were marine migrant species which use the Pranburi river estuary as a nursery for juvenile fish.
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Recommended Citation
กาญจนเรขา, ทัศพร, "นิเวศวิทยาการกินอาหารเชิงเปรียบเทียบระหว่างปลาแป้นจมูกสั้น Nuchequula gerreoides (Bleeker, 1851) และปลาแป้นกระสวย Eubleekeria splendens (Cuvier, 1829) จากปากแม่น้ำปราณบุรี ประเทศไทย" (2018). Chulalongkorn University Theses and Dissertations (Chula ETD). 3278.
https://digital.car.chula.ac.th/chulaetd/3278