J. Youson

Publications272
h-index40
Citations6,439
Highly Influential Citations210
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Phylogeny of the lamprey genus Lampetra inferred from mitochondrial cytochrome b and ND3 gene sequences
Mitochrondrial DNA analysis resolved many previously unanswered questions concerning the phylogeny of the lamprey genus Lampetra (comprising the subgenera Entosphenus, Lethenteron, and Lampetra). A… Expand
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Morphology and Physiology of Lamprey Metamorphosis
Metamorphosis is highly synchronized in both landlocked and anadromous sea lampreys, Petromyzon marinus, and can be divided into seven clearly defined stages. Although there may be some subtle… Expand
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What is metamorphosis?
Metamorphosis (Gr. meta- "change" + morphe "form") as a biological process is generally attributed to a subset of animals: most famously insects and amphibians, but some fish and many marine… Expand
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A description of the stages in the metamorphosis of the anadromous sea lamprey, Petromyzon marinus L
A large number of larval, metamorphosing, and young feeding adults of the anadromous sea lamprey, Petromyzon marinus L., have been used to provide a detailed description of the external alterations… Expand
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2 First Metamorphosis
Publisher Summary This chapter describes the different aspects of metamorphosis and fish ontogeny. The term “metamorphosis,” when considered in the broadest sense in the animal kingdom, refers to any… Expand
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Analysis of lamprey and hagfish genes reveals a complex history of gene duplications during early vertebrate evolution.
It has been proposed that two events of duplication of the entire genome occurred early in vertebrate history (2R hypothesis). Several phylogenetic studies with a few gene families (mostly Hox genes… Expand
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The Biology of Metamorphosis in Sea Lampreys: Endocrine, Environmental, and Physiological Cues and Events, and Their Potential Application to Lamprey Control
The present study describes 20 years of research driven by the view that new control methods may be a product of an extensive examination of the cues and events of sea lamprey (Petromyzon marinus)… Expand
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Morphology of the gills of larval and parasitic adult sea lamprey, Petromyzon marinus L.
The general morphology of the gills is similar in larval (ammocoetes) and parasitic adult sea lampreys, Petromyzon marinus, despite different methods of ventilation necessitated by their feeding… Expand
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Importance of Condition Factor and the Influence of Water Temperature and Photoperiod on Metamorphosis of Sea Lamprey Petromyzon marinus
The incidence of metamorphosis of larval sea lamprey, Petromyzon marinus, was strongly affected by water temperature but not photoperiod. In a 1991 experiment, the development of metamorphosing… Expand
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Lamprey parasitism of sharks and teleosts: high capacity urea excretion in an extant vertebrate relic.
We observed 10 sea lampreys (Petromyzon marinus) parasitizing basking sharks (Cetorhinus maximus), the world's second largest fish, in the Bay of Fundy. Due to the high concentrations of urea in the… Expand
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