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Verification of lipofuscin-based crustacean ageing: seasonality of lipofuscin accumulation in the stomatopod Oratosquilla oratoria in relation to water temperature
Kodama, K.; Shiraishi, H.; Morita, M.; Horiguchi, T. (2006). Verification of lipofuscin-based crustacean ageing: seasonality of lipofuscin accumulation in the stomatopod Oratosquilla oratoria in relation to water temperature. Mar. Biol. (Berl.) 150(1): 131-140. hdl.handle.net/10.1007/s00227-006-0337-x
In: Marine Biology. Springer: Heidelberg; Berlin. ISSN 0025-3162, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Kodama, K.
  • Shiraishi, H.
  • Morita, M.
  • Horiguchi, T.

Abstract
    To verify the lipofuscin-based age estimation of crustaceans of unknown age from wild populations, we conducted a modal analysis of lipofuscin-concentration histograms in the stomatopod Oratosquilla oratoria seasonally collected from Tokyo Bay, Japan. Confocal microscopy and subsequent image analysis were used to quantify lipofuscin concentrations in the protocerebral bridge cell mass in the brain. Conventional body length frequency analysis failed to detect modes corresponding to =1 year old. In contrast, four or five distinct modes were found in the lipofuscin-concentration histograms, in which modes could be readily traced across months, suggesting that each mode represented an independent age group. The lipofuscin accumulation rate fluctuated seasonally: it was high in summer (June–July) and low in winter (December–January). Cross-correlation analysis showed that the highest instantaneous lipofuscin accumulation rate was achieved in early summer before maximum bottom temperatures were reached and when the temperature was increasing most rapidly. Our findings support the usefulness of lipofuscin concentration analysis in age estimation in wild crustacean populations.

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