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dc.contributor.authorDiaz Pauli, Beatriz
dc.contributor.authorKolding, Jeppe
dc.contributor.authorJeyakanth, Geetha
dc.contributor.authorHeino, Mikko Petteri
dc.PublishedDiaz Pauli B, Kolding J, Jeyakanth G, Heino M. Effects of ambient oxygen and size-selective mortality on maturation and growth in guppies. Conservation Physiology. 2017;5(1):cox010eng
dc.description.abstractGrowth, onset of maturity and investment in reproduction are key traits for understanding variation in life-history strategies. Many environmental factors affect variation in these traits, but for fish, hypoxia and size-dependent mortality have become increasingly important because of human activities, such as increased nutrient enrichment (eutrophication), climate warming and selective fishing. Here, we study experimentally the effect of oxygen availability on maturation and growth in guppies (Poecilia reticulata) from two different selected lines, one subjected to positive and the other negative size-dependent fishing. This is the first study to assess the effects of both reduced ambient oxygen and size-dependent mortality in fish. We show that reduced ambient oxygen led to stunting, early maturation and high reproductive investment. Likewise, lineages that had been exposed to high mortality of larger-sized individuals displayed earlier maturation at smaller size, greater investment in reproduction and faster growth. These life-history changes were particularly evident for males. The widely reported trends towards earlier maturation in wild fish populations are often interpreted as resulting from size-selective fishing. Our results highlight that reduced ambient oxygen, which has received little experimental investigation to date, can lead to similar phenotypic changes. Thus, changes in ambient oxygen levels can be a confounding factor that occurs in parallel with fishing, complicating the causal interpretation of changes in life-history traits. We believe that better disentangling of the effects of these two extrinsic factors, which increasingly affect many freshwater and marine ecosystems, is important for making more informed management decisions.en_US
dc.publisherOxford University Pressen_US
dc.rightsAttribution CC BYeng
dc.subjectfishing selectioneng
dc.subjectlife historyeng
dc.subjectPoecilia reticulataeng
dc.subjectwater managementeng
dc.titleEffects of ambient oxygen and size-selective mortality on maturation and growth in guppiesen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2017 The Author(s)en_US
dc.source.journalConservation Physiology
dc.relation.projectBergens forskningsstiftelse: EvoFish
dc.relation.projectNorges forskningsråd: 214189

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