Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/97719
標題: 桃園海岸棲地對大型底棲無脊椎動物群集的影響
Effects of habitat type on benthic macroinvertebrate community on the coast of Taoyuan
作者: 尤心俞
Hsin-Yu Yu
關鍵字: 藻礁
棲地複雜度
粗糙度
大型底棲無脊椎動物
群集組成
Algal reefs
Habitat complexity
Rugosity
Benthic macroinvertebrate
Community composition
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摘要: 海岸生態系受海浪、潮汐、人為干擾等因素形成複雜多變的棲地類型。大型底棲無脊椎動物在多變的海岸棲地中扮演重要的角色,除了可以反映底質環境變化,也會影響高階物種的分布。在探討棲地與生物之間關係的同時,棲地複雜度可能是重要因素。本研究量化粗糙度(rugosity)及基質多樣性作為棲地複雜度的指標,研究桃園海岸四種主要棲地類型,分別為藻礁(R)、藻礁與礫石混生(RG)、沙地與礫石混生(SG)及沙地(S),並同時進行大型底棲無脊椎動物豐度與群集的量化調查。結果顯示,只有粗糙度指數能反映生物多樣性。在R有最高的棲地複雜度,其他依序為RG、SG、S,並且棲地複雜度越高,大型底棲無脊椎動物的豐富度與類群數皆越高,呈顯著正相關。多毛綱、雙殼綱、十足目及等足目的豐富度在棲地間有顯著差異,大型底棲無脊椎動物群集組成在棲地間亦有顯著差異。造成差異的主要因子為物理性的粗糙度及相對流速,而水質的影響相對較小。相對流速高的地方有利於水體有機質經過濾食者,因此相對流速高的R棲地,有較多的雙殼綱及濾食性的多毛綱;較高粗糙度有利於提供體型小的裂蟲科及小型小相手蟹良好的庇護所;而珠螺與海葵偏好基質多樣性較高的礫石混生棲地RG及SG。整體而言,桃園海岸水體相對流速造就多樣的棲地類型,其中以R有最高的棲地複雜度及最高的生物多樣性。因藻礁立體結構及多孔隙,高粗糙度及相對流速使群集組成相較其他棲地類型獨特。不僅提供體型小之生物躲藏,也有較多食物可供濾食性多毛類、雙殼類利用,相對凸顯了藻礁的重要性。而基質多樣性高的SG及RG可能因漂沙,而使生物多樣性相較於R低。因此,漂沙的影響應為未來藻礁保育須重視的議題。
Coastal ecosystems are affected by waves, tides, human disturbances and other factors that form complex habitat types. Benthic macroinvertebrates play an important role in coastal ecosystems, as well as reflecting changes in sediment. They also affect the distribution of high-level comsumers. While exploring the relationship between habitats and organisms, habitat complexity provides an important concept. In this study, the rugosity and substrate diversity were used as an index to quantify the complexity of habitats, and the four main habitat types on the coast of Taoyuan were quantified. They were algal reefs (R), algal reefs and gravel mixed (RG), sand and gravel mixed (SG) and Sand (S), together with quantitative surveys of benthic macroinvertebrates. The results showed that only rugosity can reflect biodiversity. The R habitat has the highest habitat complexity, followed by RG, SG, and S. The higher the habitat complexity, the greater the abundance of the benthic macroinvertebrates and the number of taxa. They showed a significant positive correlation. There are significant differences in abundance of polychaeta, bivalvia, decapoda and isopoda among habitat types. There are also significant differences in benthic macroinvertebrates community composition among habitat types. The main factors causing the differences were physical rugosity and flow velocity, while the effect of water quality was relatively minor. Where the flow velocity was high, the organic matter in the water can be filtered and consumed. Therefore, the R habitat with a relatively high flow velocity has more abundant bivalvia and filter-feeding polychaeta. The higher rugosity facilitated the provision of a small-sized Syllidae and Nanosesarma minutum a good refuge. The RG and SG of gravel mixed habitats with high substrate diversity are favored by Actiniaria and Lunella coronata. Overall, flow velocity created variable habitat types on the coast of Taoyuan, in which the R had the highest habitat complexity and the highest biodiversity. Due to the three-dimensional structure and porosity of the algal reef, the high rugosity and flow velocity led the composition of the community unique than other habitat. It not only provided small organisms to hide, but also supplied more food for filter-feeding polychaetes and bivalves. Highlighting the relative importance of algal reef. However, the SG and RG with high substrate diversity had lower biodiversity than the R, which may be due to the drift sand. Therefore, the impact of drift sand should be an issue while conducting the conservation of algal reef in the future.
URI: http://hdl.handle.net/11455/97719
文章公開時間: 2021-08-27
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