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Potential Impacts of Climate Change on Phenology and Fitness in the Endangered Diving Beetle Laccophilus nakajimai.

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Title: Potential Impacts of Climate Change on Phenology and Fitness in the Endangered Diving Beetle Laccophilus nakajimai.
Authors: Uchiyama, Ryuto (AUTHOR), Watanabe, Kohei (AUTHOR), Tanino, Ayana (AUTHOR), Sato, Yukie (AUTHOR)
Source: Entomologia Experimentalis et Applicata. Jun2026, Vol. 174 Issue 6, p589-598. 10p.
Subjects: Phenology, Biological fitness, Dytiscidae, Insect development, Climate change, Endangered species, Global warming
Geographic Terms: Japan
Abstract: The effects of global warming on insects have been reported, including the expansion of their geographic range into cooler regions, as well as shifts in their range toward these regions. However, species that are unable to cope with climate change by shifting their geographic range, such as those inhabiting alpine zones or islands, may face habitat loss and serious consequences. Laccophilus nakajimai Kamite, Hikida and M. Satô (Coleoptera: Dytiscidae), a small diving beetle endemic to Yonaguni Island, Japan, is listed as "Vulnerable" on the national Red List. The insect occurs throughout the year and appears to be most numerous in early summer. However, little is known about its life history, including its voltinism and diapause characteristics. In this study, in order to clarify the effects of global warming on this species, we reared larvae and pupae of L. nakajimai under five constant temperature conditions—18°C, 22°C, 26°C, 30°C, and 34°C—and examined the relationships between temperature, developmental rate, body size, and survival rate. As a result, all three parameters—developmental rate, body size and survival rate—showed nonlinear relationships with temperature: developmental rate peaked at 30°C, body size was largest at 22°C, and survival rate was highest at 26°C. In addition, while the developmental rate increased above 22°C, newly emerged adults tended to be smaller, suggesting a trade‐off between developmental rate and adult body size. Considering the current breeding season in its natural habitat, ongoing global warming may shorten the development period, potentially altering its phenology. Moreover, a reduction in adult body size—critical for fecundity and predator avoidance—could negatively impact fitness. To develop effective conservation strategies, further investigation into the ecological consequences of these phenological shifts and body size is needed, both through field studies and laboratory experiments. [ABSTRACT FROM AUTHOR]
Copyright of Entomologia Experimentalis et Applicata is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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DbLabel: Psychology and Behavioral Sciences Collection
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PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Potential Impacts of Climate Change on Phenology and Fitness in the Endangered Diving Beetle Laccophilus nakajimai.
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  Data: <searchLink fieldCode="AR" term="%22Uchiyama%2C+Ryuto%22">Uchiyama, Ryuto</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Watanabe%2C+Kohei%22">Watanabe, Kohei</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tanino%2C+Ayana%22">Tanino, Ayana</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sato%2C+Yukie%22">Sato, Yukie</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Entomologia+Experimentalis+et+Applicata%22">Entomologia Experimentalis et Applicata</searchLink>. Jun2026, Vol. 174 Issue 6, p589-598. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Japan%22">Japan</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The effects of global warming on insects have been reported, including the expansion of their geographic range into cooler regions, as well as shifts in their range toward these regions. However, species that are unable to cope with climate change by shifting their geographic range, such as those inhabiting alpine zones or islands, may face habitat loss and serious consequences. Laccophilus nakajimai Kamite, Hikida and M. Satô (Coleoptera: Dytiscidae), a small diving beetle endemic to Yonaguni Island, Japan, is listed as "Vulnerable" on the national Red List. The insect occurs throughout the year and appears to be most numerous in early summer. However, little is known about its life history, including its voltinism and diapause characteristics. In this study, in order to clarify the effects of global warming on this species, we reared larvae and pupae of L. nakajimai under five constant temperature conditions—18°C, 22°C, 26°C, 30°C, and 34°C—and examined the relationships between temperature, developmental rate, body size, and survival rate. As a result, all three parameters—developmental rate, body size and survival rate—showed nonlinear relationships with temperature: developmental rate peaked at 30°C, body size was largest at 22°C, and survival rate was highest at 26°C. In addition, while the developmental rate increased above 22°C, newly emerged adults tended to be smaller, suggesting a trade‐off between developmental rate and adult body size. Considering the current breeding season in its natural habitat, ongoing global warming may shorten the development period, potentially altering its phenology. Moreover, a reduction in adult body size—critical for fecundity and predator avoidance—could negatively impact fitness. To develop effective conservation strategies, further investigation into the ecological consequences of these phenological shifts and body size is needed, both through field studies and laboratory experiments. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Entomologia Experimentalis et Applicata is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=pbh&AN=193690849
RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1111/eea.70088
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 10
        StartPage: 589
    Subjects:
      – SubjectFull: Phenology
        Type: general
      – SubjectFull: Biological fitness
        Type: general
      – SubjectFull: Dytiscidae
        Type: general
      – SubjectFull: Insect development
        Type: general
      – SubjectFull: Climate change
        Type: general
      – SubjectFull: Endangered species
        Type: general
      – SubjectFull: Global warming
        Type: general
      – SubjectFull: Japan
        Type: general
    Titles:
      – TitleFull: Potential Impacts of Climate Change on Phenology and Fitness in the Endangered Diving Beetle Laccophilus nakajimai.
        Type: main
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          Name:
            NameFull: Uchiyama, Ryuto
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            NameFull: Watanabe, Kohei
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            NameFull: Tanino, Ayana
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            NameFull: Sato, Yukie
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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              Value: 174
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            – TitleFull: Entomologia Experimentalis et Applicata
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