Population viability analysis predicts decreasing genetic diversity in ex situ populations of the Itasenpara bitterling Acheilognathus longipinnis from the Kiso River, Japan

Yamazaki, Y.; Ikeya, Koki; Goto, Kouichi; Chimura, Yoshizumi

doi:10.1007/s10228-016-0540-9

Cited by 5 publications

(1 citation statement)

References 34 publications

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“…However, there was almost no Itasenpara bitterling in the Yodo River (Osaka plain, no fluctuating environments in recent years) and in the Nakayachi River (no fluctuating environments) adjacent to the study section (Nishio et al, ). Additionally, Itasenpara bitterling is on the verge of extinction (Nishio et al, ; Ogawa et al, ; Yamazaki, Ikeya, Goto, & Chimura, ). Therefore, we suggest that the morphological changes detected in the present study are an acquired character, but are adapted to the fluctuating environments with local adaptation (i.e.…”

Section: Resultsmentioning

confidence: 99%

Morphological changes and habitat shifts with growth of endangered floodplain fish: Possible adaptations to fluctuating environments

Nishio

Edo

Kawakami³

et al. 2019

Ecology of Freshwater Fish

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Adaptations that maximise food intake are dependent on food and/or habitat types. However, there have been few studies on the ability of floodplain primary freshwater fish to rapidly change their morphology, especially the internal one, to maximise utilisation efficiency of food resources in response to environmental fluctuations during their life history. We investigated morphological changes of an Acheilognathinae species (Acheilognathus longipinnis) that inhabits creeks in Japan to determine whether body shape variation correlated with environmental characteristics, including water depth, current velocity, vegetation cover and food availability. When shifting from floodwater‐level to low‐water‐level season, the current velocity of the study area increased as the water level decreased, causing a significant increase in periphyton and a significant decline in zooplankton and phytoplankton. Concurrently, during the short period when A. longipinnis grow from the juvenile to the premature stage, changes in internal morphology, that is intestinal elongation, and changes in external morphology such as an increase of body depth were observed. In contrast, intestinal length significantly decreased in the adult stage. Our findings suggest that morphological changes between floodwater‐level and low‐water‐level seasons associated with juvenile to premature development are an adaptation to changes in food availability due to environmental fluctuations. Additionally, the shortening of the intestine from the premature to the adult stage may be an adaptive strategy for reproduction.

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Section: Resultsmentioning

confidence: 99%