Comparison of Fatty Acid Patterns of Riparian Spiders (Family: Araneidae and Tetragnathidae) in Relation to Eutrophication Status of Lakes
- 주제(키워드) Aquatic-terrestrial ecosystem , Trophic transfer , Fatty acids , Riparian orb-weaving spiders
- 주제(DDC) 570
- 발행기관 아주대학교 일반대학원
- 지도교수 Sangkyu Park
- 발행년도 2025
- 학위수여년월 2025. 2
- 학위명 석사
- 학과 및 전공 일반대학원 생명과학과
- 실제URI http://www.dcollection.net/handler/ajou/000000034715
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Eutrophication alters the structure and function of aquatic ecosystems, potentially influencing energy transfer to terrestrial systems. This study investigates the transfer of fatty acids from aquatic primary producers (seston) to riparian spiders (Family: Araneidae and Tetragnathidae), with a focus on Eicosapentaenoic acid (EPA; 20:5ω3), a key long-chain polyunsaturated fatty acid (LC-PUFA). Using Locally weighted scatterplot smoothing (LOESS) analysis, I identified non-linear patterns between New Korean Trophic State Index (TSIKON) and specific seston fatty acids. Seston EPA showed a unimodal pattern peaking at intermediate TSI values before declining. Similar trends were observed in Araneidae EPA, though with a more gradual curvature, suggesting trophic transfer of fatty acids influenced by eutrophication. Mediation analysis confirmed that TSIKON indirectly affected Araneidae EPA through seston EPA, highlighting seston as a critical mediator in the fatty acid transfer pathway. While statistical correlations supported first producer-to-terrestrial second consumer fatty acid transfer, limitations in sample size, absence of intermediate trophic levels (e.g., aquatic insects), and reliance on literature-based calibration curves indicate the need for further research. This study provides insights into how eutrophication-driven changes in seston fatty acid composition impact riparian spider communities. By emphasizing the role of specific fatty acid pairs (e.g., seston EPA to Araneidae EPA), it provides basic data for understanding ecological consequences of eutrophication on cross-ecosystem energy flows.
more목차
1. Introduction 1
2. Materials and Methods 3
2.1 Study sites and sampling information 3
2.2 Fatty acid analysis 7
2.3 Chlorophyll a and total phosphorous analysis 8
2.4 TSIKON calculation 9
2.5 Statistical analysis 9
3. Results 11
3.1 Fatty acid composition patterns in seston and riparian spiders across lake sites 11
3.2 Comparison of fatty acid profiles in Araneidae and Tetragnathidae across sites 15
3.3 LOESS analysis of fatty acid patterns in three taxa 18
3.4 Linear regression analysis of fatty acid relationships between seston and spiders 24
3.5 Mediation analysis of eutrophication effects on fatty acids in Araneidae via seston 28
4. Discussion 32
References 35
국 문 요 약 38
