Sub-Antarctic and High Antarctic Notothenioid Fishes: Ecology and Adaptational Biology Revealed by the ICEFISH 2004 Cruise of RVIB Nathaniel B. Palmer

Detrich, H. William; Buckley, Bradley A.; Doolittle, D.; Jones, Christopher D.; Lockhart, Susanne J.

doi:10.5670/oceanog.2012.93

Cited by 9 publications

(6 citation statements)

References 11 publications

(12 reference statements)

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“…Upon exposure of insects to various environmental stressors, synthesis of most proteins declines, but hsp expression usually increases (King & MacRae, ). Some species with a local adaptation history to cold environmental conditions show attenuated hsp levels or even lost this essential protective mechanism in response to elevated temperatures (Clark, Fraser, & Peck, ; Detrich, Buckley, Doolittle, Jones, & Lockhart, ; Oksala et al, ). Most hsps identified in all treatments showed no significant norm of reaction variability between temperature treatments, but generally high abundances at all three temperatures could be observed (Figure ).…”

Section: Discussionmentioning

confidence: 99%

Comparative proteomics of stenotopic caddisfly Crunoecia irrorata identifies acclimation strategies to warming

2019

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Species' ecological preferences are often deduced from habitat characteristics thought to represent more or less optimal conditions for physiological functioning. Evolution has led to stenotopic and eurytopic species, the former having decreased niche breadths and lower tolerances to environmental variability. Species inhabiting freshwater springs are often described as being stenotopic specialists, adapted to the stable thermal conditions found in these habitats. Whether due to past local adaptation these species have evolved or have lost intra‐generational adaptive mechanisms to cope with increasing thermal variability has, to our knowledge, never been investigated. By studying how the proteome of a stenotopic species changes as a result of increasing temperatures, we investigate if the absence or attenuation of molecular mechanisms is indicative of local adaptation to freshwater springs. An understanding of compensatory mechanisms is especially relevant as spring specialists will experience thermal conditions beyond their physiological limits due to climate change. In this study, the stenotopic species Crunoecia irrorata (Trichoptera: Lepidostomatidae, Curtis 1834) was acclimated to 10, 15 and 20°C for 168 hr. We constructed a homology‐based database and via liquid chromatography‐tandem mass spectrometry (LC‐MS/MS)‐based shotgun proteomics identified 1,358 proteins. Differentially abundant proteins and protein norms of reaction revealed candidate proteins and molecular mechanisms facilitating compensatory responses such as trehalose metabolism, tracheal system alteration and heat‐shock protein regulation. A species‐specific understanding of compensatory physiologies challenges the characterization of species as having narrow tolerances to environmental variability if that characterization is based on occurrences and habitat characteristics alone.

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Section: Discussionmentioning

confidence: 99%

Comparative proteomics of stenotopic caddisfly Crunoecia irrorata identifies acclimation strategies to warming

2019

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“…Several novel traits arose by mutation and natural selection during the 5-10 million years of isolation these animals experienced in their chronically icy environment. Prominent features include constitutive expression of protective antifreeze proteins (Chen et al, 1997;Cheng and Chen, 1999), modification of the microtubule cytoskeleton to function at low temperature (Detrich et al, 1989;Detrich et al, 2000;Redeker et al, 2004), and loss of an inducible heatshock protein response (Hofmann et al, 2000;Buckley et al, 2004;Detrich et al, 2012). In addition, the icefish clade of notothenioids lost hemoglobin expression (Cocca et al, 1995;Zhao et al, 1998;Near et al, 2006) and relinquished robustly mineralized skeletons (Albertson et al, 2009;Albertson et al, 2010;Eastman et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Embryogenesis and early skeletogenesis in the antarctic bullhead notothen, Notothenia coriiceps

Postlethwait

Yan

Desvignes

et al. 2016

Developmental Dynamics

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Background Environmental temperature influences rates of embryonic development, but a detailed staging series for vertebrate embryos developing in the sub-zero cold of Antarctic waters is not yet available from fertilization to hatching. Given projected warming of the Southern Ocean, it is imperative to establish a baseline to evaluate potential effects of changing climate on fish developmental dynamics. Results We studied the Bullhead notothen (Notothenia coriiceps), a notothenioid fish inhabiting waters between −1.9 and +2 °C. In vitro fertilization produced embryos that progressed through cleavage, epiboly, gastrulation, segmentation, organogenesis, and hatching. We compared morphogenesis spatially and temporally to zebrafish and medaka. Experimental animals hatched after about six months to early larval stages. To help understand skeletogenesis, we analyzed late embryos for expression of sox9, and runx2, which regulate chondrogenesis, osteogenesis, and eye development. Results revealed that, despite its prolonged developmental time course, N. coriiceps embryos developed similarly to those of other teleosts with large yolk cells. Conclusions Our studies set the stage for future molecular analyses of development in these extremophile fish. Results provide a foundation for understanding the impact of ocean warming on embryonic development and larval recruitment of notothenioid fish, which are key factors in the marine trophic system.

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“…During this prolonged cooling period, many taxa became locally extinct, liberating numerous ecological niches into which notothenioids could radiate ( Eastman 1993 ; Eastman and McCune 2000 ). As notothenioids conquered Antarctic waters, they evolved key innovations, including the origin of antifreeze glycoproteins (AFGPs) ( DeVries 1988 ; Chen et al 1997 ; Cheng and Chen 1999 ; Cheng and Detrich 2007 ) and a greatly altered inducible heat shock response ( Hofmann et al 2000 ; Place and Hofmann 2005 ; Huth and Place 2013 ; Buckley et al 2004 ; Buckley and Somero 2009 ; Detrich et al 2012 ).…”

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confidence: 99%

Cold Fusion: Massive Karyotype Evolution in the Antarctic Bullhead NotothenNotothenia coriiceps

Amores

Wilson

Allard

et al. 2017

G3 Genes|Genomes|Genetics

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Half of all vertebrate species share a series of chromosome fusions that preceded the teleost genome duplication (TGD), but we do not understand the causative evolutionary mechanisms. The “Robertsonian-translocation hypothesis” suggests a regular fusion of each ancestral acro- or telocentric chromosome to just one other by centromere fusions, thus halving the karyotype. An alternative “genome-stirring hypothesis” posits haphazard and repeated fusions, inversions, and reciprocal and nonreciprocal translocations. To study large-scale karyotype reduction, we investigated the decrease of chromosome numbers in Antarctic notothenioid fish. Most notothenioids have 24 haploid chromosomes, but bullhead notothen (Notothenia coriiceps) has 11. To understand mechanisms, we made a RAD-tag meiotic map with ∼10,000 polymorphic markers. Comparative genomics aligned about a thousand orthologs of platyfish and stickleback genes along bullhead chromosomes. Results revealed that 9 of 11 bullhead chromosomes arose by fusion of just two ancestral chromosomes and two others by fusion of three ancestral chromosomes. All markers from each ancestral chromosome remained contiguous, implying no inversions across fusion borders. Karyotype comparisons support a history of: (1) Robertsonian fusions of 22 ancestral chromosomes in pairs to yield 11 fused plus two small unfused chromosomes, like N. angustata; (2) fusion of one of the remaining two ancestral chromosomes to a preexisting fused pair, giving 12 chromosomes like N. rossii; and (3) fusion of the remaining ancestral chromosome to another fused pair, giving 11 chromosomes in N. coriiceps. These results raise the question of what selective forces promoted the systematic fusion of chromosomes in pairs and the suppression of pericentric inversions in this lineage, and provide a model for chromosome fusions in stem teleosts.

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Sub-Antarctic and High Antarctic Notothenioid Fishes: Ecology and Adaptational Biology Revealed by the ICEFISH 2004 Cruise of RVIB Nathaniel B. Palmer

Cited by 9 publications

References 11 publications

Comparative proteomics of stenotopic caddisfly Crunoecia irrorata identifies acclimation strategies to warming

Comparative proteomics of stenotopic caddisfly Crunoecia irrorata identifies acclimation strategies to warming

Embryogenesis and early skeletogenesis in the antarctic bullhead notothen, Notothenia coriiceps

Cold Fusion: Massive Karyotype Evolution in the Antarctic Bullhead NotothenNotothenia coriiceps

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