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標題: | 年齡結構和緯度對於日本帶魚幼魚異速成長的影響 Demography and latitudes influence allometric growth for juvenile cutlassfish Trichiurus japonicus |
作者: | Ting-Yu Hsiao 蕭婷宇 |
指導教授: | 王慧瑜(Hui-Yu Wang) |
關鍵字: | 日本帶魚,幼魚,異速成長模式,成長率,日齡, Cutlassfish,juvenile fish,allometric growth model,growth rate,daily age, |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 幼魚的成長率攸關成魚的生存率,並且影響成熟年齡。較大的幼魚具有競爭優勢,並提高生存率,進而影響族群的成長。目前對於海洋魚類幼魚成長率的研究仍然很少,為了增進對幼魚成長率的了解,我們以廣佈在西北太平洋(熱帶至溫帶),並且全年產卵的日本帶魚作為研究的物種,研究日本帶魚幼魚在不同棲地和季節間的成長率的差異。我們根據生態代謝理論,建構異速成長模式來描述幼魚成長率(G)和體型(W)之間的異速關係(G=cW^β)。異速指數(β)代表生物透過分形結構的運輸系統運送必要養分或氧氣,我們假定為常數(β=0.75,遵循代謝率中的體重的四分之三次方定律),而異速係數(c)反映了淨能量攝入,它可能因個體發育或受溫度的影響。因此,我們假設個體發育和溫度升高將提高異速係數。我們從西北太平洋三個帶魚主要的卸魚港口:舟山,梗枋和梓官,收集幼魚樣本,以耳石日齡(日齡29至186天)與幼魚體重建構模式、估計異速係數。我們的結果不支持這些假說,我們發現個體發育與異速係數為負相關,並且族群中個體年齡組成的差異會混淆棲地和季節對異速係數的影響。此外,我們也發現舟山的幼魚體型較大。綜合這些結果顯示跨緯度的棲地間幼魚的異速係數恆定,但跨緯度的棲地間的幼魚體型不同,而且緯度對日本帶魚幼魚體型及族群成長率具有重要影響。 Because juvenile growth rates confer survival probability to the adult stage and determine the timing of maturation, variation in this trait should have an impact on population growth. However, evaluation of juvenile growth rates for most marine fishes is still scarce. To fill this knowledge gap, we investigated spatial and seasonal variation in juvenile growth rates for a cutlassfish Trichiurus japonicus, which have a broad range of distribution in the NW Pacific (tropical-to-temperate climatic regions) and a year-round spawning period. Based the Metabolic scaling theory, we developed a model depicting a general allometric relationship (G=cW^β) between growth rates (G) and body size (W). The allometric exponent β, representing the universal fractal structure of the biological transport systems for essential nutrients or oxygen, is assumed a constant (i.e., β = 0.75, following the ¾ power law for metabolic rates). On the other hand, coefficient c reflects the net energy intake, which may increase ontogenetically and is under the influence of temperature. Consequently, we hypothesized that ontogenetic effects and warmer temperature will lead to higher c. We estimated c using otolith-derived daily growth rates of juveniles (daily ages =29-186 days) from 3 landing ports of cutlassfishes: ZH (29⁰57’N, 122⁰12’E), KF (24⁰53'-54'N, 121⁰52'E) and TK (22⁰43'N, 120⁰15'E). Our results did not support these hypotheses, but revealing that a significant, negative ontogenetic effect, confounding the spatial and seasonal effects on c. Furthermore, juvenile body size is larger at ZH after accounting for the ontogenetic effects on c. Together, these results suggest constant growth rates but differential body size for juvenile cutlassfish across latitudes. Such latitudinal variation in juvenile body size has important implications for geographic differential population growth rates for the cutlassfish. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/19399 |
DOI: | 10.6342/NTU202003696 |
全文授權: | 未授權 |
顯示於系所單位: | 海洋研究所 |
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