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hydrobiological
hydrobiological adj.
Brit. 
/ˌhʌɪdrə(ʊ)bʌɪəˈlɒdʒᵻkl/
, /ˌhʌɪdrə(ʊ)bʌɪəˈlɒdʒᵻkl/U.S. /ˌhaɪdroʊˌbaɪəˈlɑdʒək(ə)l/
/ˌhaɪdroʊˌbaɪəˈlɑdʒək(ə)l/ΘΚΠ
the world > life > biology > study > [adjective] > ecology > specific habitats
marine biological1876
limnobiologic1899
cryobiological1922
hydrobiological1933
saprobiological1960
1933 Geogr. Jrnl. 81 533 It [sc. the Arctic Institute of the U.S.S.R.]..carries on geological, geomorphological, hydrological and hydrobiological investigations.
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