Can Oxygen Set Thermal Limits in an Insect and Drive Gigantism?
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{"title"=>"Can Oxygen set thermal limits in an insect and drive gigantism?", "type"=>"journal", "authors"=>[{"first_name"=>"Wilco C E P", "last_name"=>"Verberk", "scopus_author_id"=>"55889412300"}, {"first_name"=>"David T.", "last_name"=>"Bilton", "scopus_author_id"=>"55667424600"}], "year"=>2011, "source"=>"PLoS ONE", "identifiers"=>{"pmid"=>"21818347", "sgr"=>"79960766904", "doi"=>"10.1371/journal.pone.0022610", "scopus"=>"2-s2.0-79960766904", "pui"=>"362224338", "isbn"=>"1932-6203", "issn"=>"19326203"}, "id"=>"e7898e57-d35a-3c8b-84a4-4d228d48a6b4", "abstract"=>"BACKGROUND: Thermal limits may arise through a mismatch between oxygen supply and demand in a range of animal taxa. Whilst this oxygen limitation hypothesis is supported by data from a range of marine fish and invertebrates, its generality remains contentious. In particular, it is unclear whether oxygen limitation determines thermal extremes in tracheated arthropods, where oxygen limitation may be unlikely due to the efficiency and plasticity of tracheal systems in supplying oxygen directly to metabolically active tissues. Although terrestrial taxa with open tracheal systems may not be prone to oxygen limitation, species may be affected during other life-history stages, particularly if these rely on diffusion into closed tracheal systems. Furthermore, a central role for oxygen limitation in insects is envisaged within a parallel line of research focussing on insect gigantism in the late Palaeozoic.\\n\\nMETHODOLOGY/PRINCIPAL FINDINGS: Here we examine thermal maxima in the aquatic life stages of an insect at normoxia, hypoxia (14 kPa) and hyperoxia (36 kPa). We demonstrate that upper thermal limits do indeed respond to external oxygen supply in the aquatic life stages of the stonefly Dinocras cephalotes, suggesting that the critical thermal limits of such aquatic larvae are set by oxygen limitation. This could result from impeded oxygen delivery, or limited oxygen regulatory capacity, both of which have implications for our understanding of the limits to insect body size and how these are influenced by atmospheric oxygen levels.\\n\\nCONCLUSIONS/SIGNIFICANCE: These findings extend the generality of the hypothesis of oxygen limitation of thermal tolerance, suggest that oxygen constraints on body size may be stronger in aquatic environments, and that oxygen toxicity may have actively selected for gigantism in the aquatic stages of Carboniferous arthropods.", "link"=>"http://www.mendeley.com/research/oxygen-set-thermal-limits-insect-drive-gigantism", "reader_count"=>104, "reader_count_by_academic_status"=>{"Unspecified"=>2, "Professor > Associate Professor"=>6, "Researcher"=>18, "Student > Doctoral Student"=>7, "Student > Ph. D. Student"=>22, "Student > Postgraduate"=>6, "Student > Master"=>12, "Other"=>3, "Student > Bachelor"=>21, "Lecturer > Senior Lecturer"=>1, "Professor"=>6}, "reader_count_by_user_role"=>{"Unspecified"=>2, "Professor > Associate Professor"=>6, "Researcher"=>18, "Student > Doctoral Student"=>7, "Student > Ph. D. Student"=>22, "Student > Postgraduate"=>6, "Student > Master"=>12, "Other"=>3, "Student > Bachelor"=>21, "Lecturer > Senior Lecturer"=>1, "Professor"=>6}, "reader_count_by_subject_area"=>{"Unspecified"=>7, "Engineering"=>1, "Environmental Science"=>13, "Biochemistry, Genetics and Molecular Biology"=>1, "Agricultural and Biological Sciences"=>68, "Medicine and Dentistry"=>1, "Arts and Humanities"=>1, "Physics and Astronomy"=>1, "Earth and Planetary Sciences"=>11}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>1}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>1}, "Physics and Astronomy"=>{"Physics and Astronomy"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>11}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>68}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>1}, "Unspecified"=>{"Unspecified"=>7}, "Environmental Science"=>{"Environmental Science"=>13}, "Arts and Humanities"=>{"Arts and Humanities"=>1}}, "reader_count_by_country"=>{"Canada"=>1, "Argentina"=>1, "United States"=>3, "Denmark"=>1, "Brazil"=>1, "Poland"=>1, "United Kingdom"=>2, "South Africa"=>1, "Italy"=>1, "Germany"=>1}, "group_count"=>2}

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  • {"files"=>["https://ndownloader.figshare.com/files/751781"], "description"=>"<p>Ancova statistics on critical thermal maxima. Significant results are indicated in bold. Thermal maxima were highest for hyperoxia (36 kPa) and lowest for hypoxia (14 kPa). In addition thermal maxima were lowest for larvae which consumed more oxygen at higher temperatures. (SS = Sum of squares; d.f. = degrees of freedom).</p>", "links"=>[], "tags"=>["thermal", "maxima", "ambient", "larval"], "article_id"=>422152, "categories"=>["Physiology", "Biochemistry", "Ecology", "Developmental Biology", "Evolutionary Biology"], "users"=>["Wilco C. E. P. Verberk", "David T. Bilton"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0022610.t001", "stats"=>{"downloads"=>1, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Statistical_analysis_of_critical_thermal_maxima_in_relation_to_ambient_oxygen_levels_larval_oxygen_consumption_and_body_mass_/422152", "title"=>"Statistical analysis of critical thermal maxima in relation to ambient oxygen levels, larval oxygen consumption and body mass.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-02-20 16:18:43"}
  • {"files"=>["https://ndownloader.figshare.com/files/751697"], "description"=>"<p>Differences in <i>CT</i><sub>max</sub> were consistent with the mechanism of oxygen limitation: hypoxia lowered <i>CT</i><sub>max</sub>, while hyperoxia increased <i>CT</i><sub>max</sub> (a) and thermal maxima were lower for individuals which strongly increased their oxygen consumption rates at higher temperatures (high Q<sub>10</sub> values). Each bar represents the average (± s.e.) of 15 nymphs. Letters indicate significant differences (<i>P<0.05</i>; Tukey HSD post hoc test following an anova including only oxygen treatment: F<sub>2,41</sub> = 44·06, P<0·001).</p>", "links"=>[], "tags"=>["thermal", "maxima", "stonefly", "levels", "nymphs"], "article_id"=>422068, "categories"=>["Physiology", "Biochemistry", "Ecology", "Developmental Biology", "Evolutionary Biology"], "users"=>["Wilco C. E. P. Verberk", "David T. Bilton"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0022610.g001", "stats"=>{"downloads"=>1, "page_views"=>22, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Differences_in_critical_thermal_maxima_CT_max_in_the_stonefly_Dinocras_cephalotes_at_three_different_levels_of_oxygen_a_the_relationship_between_CT_max_of_the_stonefly_nymphs_and_their_thermal_sensitivity_in_oxygen_consumption_b_and_their_body_mass_c_/422068", "title"=>"Differences in critical thermal maxima (<i>CT</i><sub>max</sub>) in the stonefly <i>Dinocras cephalotes</i> at three different levels of oxygen (a), the relationship between <i>CT</i><sub>max</sub> of the stonefly nymphs and their thermal sensitivity in oxygen consumption (b) and their body mass (c).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 16:18:13"}

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Relative Metric

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