However, evidence for such a gradient is ambiguous; Gyrodactylidae have not yet been found in the deep sea.
2.
Explanation 6 is unlikely, because small organisms are common in cold seas, Gyrodactylidae are among the smallest Monogenea ( 7 ), and Monogenea do not possess calcareous skeletons ( 8 ).
3.
Most of these explanations can be excluded for the Monogenea, whose larvae are never planktotrophic ( therefore eliminating explanations 1 and 2 ), their larvae are always short-lived ( 3 ), Gyrodactylidae are most common not only close to melting ice but in cold seas generally ( 5 ).
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