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Morphological trophic variation of the cyprinid Megalobrama pellegrini (Tchang, 1930) with different keratinized beaks from upper reaches of the Yangtze River, China
Zhang, Zhi1,2; Yu, Dan1; Zhai, Dongdong1,2; Liu, Fei1; Liu, Huanzhang1
2020
Source PublicationENVIRONMENTAL BIOLOGY OF FISHES
ISSN0378-1909
Volume103Issue:1Pages:115-123
Abstract

Megalobrama pellegrini, a cyprinid endemic to the upper Yangtze River China, has thick keratinized beaks on the jaws and feeds on algae and molluscs. The size of keratinized beaks varies among different individuals. In the present study, two populations, from Longxihe (LXH) and Chishui (CSH) Rivers, were examined in order to explore the morphological variation of keratinized beaks, together with an analysis of intestine length and of stable isotopes. The results showed that the ratio of upper to lower keratinized beaks varied from 0.84 to 2.06. We defined the ratio < 1.25 as equal beak (EB) form, while >1.26 as thicker upper beak (TUB) form. In the LXH population, there were more TUB forms, while EB forms dominated in CSH population. Intestine length showed a negative relationship with the upper to lower beak ratio (Pearson correlation coefficient = -0.697, P < 0.01) indicating the possible adaptation of beak size to food type. In addition, analysis of stable isotope showed that these two populations differed in their food, and there was a positive relationship between trophic niche and size of beaks (R = 0.5530 and 0.4927, respectively). This further supported the suggestion that the beak size was possibly adapted to food type, with the TUB form to a higher trophic niche and the EB form to a lower trophic niche.

KeywordAdaptation Trophic differentiation Keratinized beak jaws Polymorphism Yangtze River
DOI10.1007/s10641-019-00937-9
Indexed BySCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology ; Marine & Freshwater Biology
WOS SubjectEcology ; Marine & Freshwater Biology
WOS IDWOS:000511976500009
WOS KeywordINDUCED PHENOTYPIC PLASTICITY ; STABLE-ISOTOPE ; FEEDING MORPHOLOGY ; CHISHUI RIVER ; CHARACTER DISPLACEMENT ; NATURAL-SELECTION ; INTESTINE LENGTH ; STOMACH CONTENT ; DIET ; EVOLUTIONARY
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/35019
Collection水生生物多样性与资源保护研究中心_期刊论文
Corresponding AuthorLiu, Huanzhang
Affiliation1.Chinese Acad Sci, Key Lab Aquat Biodivers & Conservat Chinese Acad, Inst Hydrobiol, Wuhan 430072, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Zhi,Yu, Dan,Zhai, Dongdong,et al. Morphological trophic variation of the cyprinid Megalobrama pellegrini (Tchang, 1930) with different keratinized beaks from upper reaches of the Yangtze River, China[J]. ENVIRONMENTAL BIOLOGY OF FISHES,2020,103(1):115-123.
APA Zhang, Zhi,Yu, Dan,Zhai, Dongdong,Liu, Fei,&Liu, Huanzhang.(2020).Morphological trophic variation of the cyprinid Megalobrama pellegrini (Tchang, 1930) with different keratinized beaks from upper reaches of the Yangtze River, China.ENVIRONMENTAL BIOLOGY OF FISHES,103(1),115-123.
MLA Zhang, Zhi,et al."Morphological trophic variation of the cyprinid Megalobrama pellegrini (Tchang, 1930) with different keratinized beaks from upper reaches of the Yangtze River, China".ENVIRONMENTAL BIOLOGY OF FISHES 103.1(2020):115-123.
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