서해 중부 연안에 출현하는 쥐노래미(Hexagrammos otakii)의 성장과 계절에 따른 식성 변화 Size-related and Temporal Dietary Variations of Hexagrammos otakii in the Mid-western Coast of Korea원문보기
본 연구는 서해 중부 연안에 출현하는 쥐노래미 (Hexagrammos otakii)의 위내용물 분석을 통하여, 위내용물 조성과 성장 및 계절별 식성변화를 분석하였다. 쥐노래미의 전장 (total length, TL)은 5.6 cm에서 32.4 cm의 범위였다. 쥐노래미는 단각류 (amphipods), 새우류 (carid shrimps), 어류 (teleosts)를 주로 섭식하였고, 그 외 다양한 저서 갑각류와 무척추동물을 소량 섭식하였다. 새우류와 어류는 미성어 (immature)와 성어 (mature)의 위내용물에서 공통적으로 우점하였다. 단각류와 갯지렁이류 (polychaetes)는 그 다음으로 우점하였는데, 단각류는 작은 크기의 어류에서, 갯지렁이류는 큰 크기의 어류에서 그 비율이 더 높았다. DISTLM (distance-based linear modelling) 결과, 쥐노래미의 위내용물은 전장, 계절, 수온에 따라 유의하게 변하였지만, 성숙도와는 관련이 없었다.
본 연구는 서해 중부 연안에 출현하는 쥐노래미 (Hexagrammos otakii)의 위내용물 분석을 통하여, 위내용물 조성과 성장 및 계절별 식성변화를 분석하였다. 쥐노래미의 전장 (total length, TL)은 5.6 cm에서 32.4 cm의 범위였다. 쥐노래미는 단각류 (amphipods), 새우류 (carid shrimps), 어류 (teleosts)를 주로 섭식하였고, 그 외 다양한 저서 갑각류와 무척추동물을 소량 섭식하였다. 새우류와 어류는 미성어 (immature)와 성어 (mature)의 위내용물에서 공통적으로 우점하였다. 단각류와 갯지렁이류 (polychaetes)는 그 다음으로 우점하였는데, 단각류는 작은 크기의 어류에서, 갯지렁이류는 큰 크기의 어류에서 그 비율이 더 높았다. DISTLM (distance-based linear modelling) 결과, 쥐노래미의 위내용물은 전장, 계절, 수온에 따라 유의하게 변하였지만, 성숙도와는 관련이 없었다.
Stomach contents of Hexagrammos otakii collected from mid-western coast of Korea were analysed to determine dietary composition, and ontogenetic and temporal dietary variations. Fish total length (TL) ranged between 5.6 and 32.4 cm. H. otakii primarily consumed amphipods, carid shrimps and teleosts,...
Stomach contents of Hexagrammos otakii collected from mid-western coast of Korea were analysed to determine dietary composition, and ontogenetic and temporal dietary variations. Fish total length (TL) ranged between 5.6 and 32.4 cm. H. otakii primarily consumed amphipods, carid shrimps and teleosts, but also ate various benthic crustaceans and other invertebrates with small amounts. Carid shrimps and teleosts dominated the diet of both immature and mature fishes. Amphipods and polychaetes were secondary, and the former more frequently consumed by smaller specimens, while the latter was more abundant in the diets of larger fishes. DISTLM (distance-based linear modelling) showed diet composition of H. otakii varying significantly with TL, season and water temperature, but did not with maturity.
Stomach contents of Hexagrammos otakii collected from mid-western coast of Korea were analysed to determine dietary composition, and ontogenetic and temporal dietary variations. Fish total length (TL) ranged between 5.6 and 32.4 cm. H. otakii primarily consumed amphipods, carid shrimps and teleosts, but also ate various benthic crustaceans and other invertebrates with small amounts. Carid shrimps and teleosts dominated the diet of both immature and mature fishes. Amphipods and polychaetes were secondary, and the former more frequently consumed by smaller specimens, while the latter was more abundant in the diets of larger fishes. DISTLM (distance-based linear modelling) showed diet composition of H. otakii varying significantly with TL, season and water temperature, but did not with maturity.
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제안 방법
The order of stomachs to construct the cumulative prey curve was randomized 100 times to assess variability in the asymptote (Ferry and Cailliet, 1996). The cumulative prey curve was constructed by plotting the mean numbers of 13 prey taxa (polychaetes, gastropods, bivalves, cephalopods, isopods, amphipods, mysids, penaeid shrimps, carid shrimps, hermit crabs, crabs, stomatopods and teleosts) against the number of stomachs analysed. When as at least ten previous values of the total number of prey taxa were in the range of the asymptotic number of prey±0.
The objectives of this study were to determine dietary composition of H. otakii and to identify dietary variations with respect to fish size, maturity, season and water temperature. The results would be highly beneficial both for management purposes and future trophic community analyses in Korean waters.
이론/모형
maturity and season) from the DISTLM and ANOSIM. All of above tests were performed using the routines in the PRIMER v7 multivariate statistics package (www. primer-e.com) and the PERMANOVA+ add-on module (Anderson et al., 2008).
성능/효과
otakii was carnivorous fish that consumed various benthic invertebrates and teleosts (Table 1). Based on the %IRI values, the greatest contributors in the diets of H. otakii were epibenthic crustaceans (e.g. amphipods and carid shrimps) and teleosts, with the majority being benthic thus suggesting foraging close to or just above the surface of the substratum. The importance of these prey items in the diets was also reported elsewhere.
In conclusion, this study offers important insights into the diets of H. otakii that are abundant in the mid-western coast of Korea. Stomach contents indicated that they consume mainly epibenthic crustaceans and teleosts, with observing some ontogenetic and temporal changes in diets.
8%). Polychaetes and crabs were second in importance, comprising 3.4% and 1.9%, respectively, and all of remaining prey taxa constituted less than 1.0% in IRI.
otakii was related with season, temperature and total length, with the most parsimonious conditional model for diet composition including these three predictors (Table 2). The model explained only 15.3% of the data variability (conditional test), indicating most of the variability in diet could not be explained by the predictors. Two-way crossed ANOSIM showed that the dietary composition of H.
3% of the data variability (conditional test), indicating most of the variability in diet could not be explained by the predictors. Two-way crossed ANOSIM showed that the dietary composition of H. otakii differed with season (P=0.001), but not with maturity (P=0.122), and that the global R-statistic values were higher for season than maturity (global R=0.256 verse 0.062). Pairwise ANOSIM further demonstrated that all seasonal comparisons were significant, with being strongest between summer and autumn.
후속연구
Nonetheless, due to the lack of information on all season data and on seasonal abundance of prey items in the study area, our data did not show true temporal diet changes. Further studies are demanded to discover dietary habits of H. otakii in detail.
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