Interspecific variation in hypoxia tolerance and hypoxia acclimation responses in killifish from the family Fundulidae

The brain gross morphology of Rhamdia quelen is described and compared with seven species of six genera of Heptapteridae. Interspecific variation in shape, size, and position of brain subdivisions was observed in all examined species. The posterior position of the hypophysis on the hypothalamus and presence of a lateral subdivision on the lobus facialis are shared by all examined heptapterids. Rhamdia quelen and Pimelodella gracilis, currently considered closely related within the family Heptapteridae, exhibit the anterior and posterior area of the telencephalon with equivalent widths, and the lateral line lobe reaching the anterior area of the lobus vagi. Members of the so called Nemuroglanis sub-clade (Cetopsorhamdia iheringi, Heptapterus mustelinus, Imparfinis mirini, and Phenacorhamdia tenebrosa) share the lobus vagi proportional smaller than the lobus facialis; the lateral line lobe reaching the half length of the lobus facialis; the tectum mesencephali in contact with the telencephalon, and thinner anterior area of the telencephalon. The results reveal several features that are phylogenetically informative among the heptapterids examined, and corroborate previous hypotheses based on other non-neural anatomical characters.

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Interspecific variation in life history traits of Elasmostethus (Hemiptera: Acanthosomatidae)

The Canadian Entomologist ◽

10.4039/tce.2018.56 ◽

2018 ◽

Vol 151 (1) ◽

pp. 69-72 ◽

Cited By ~ 1

Author(s):

S. Kudo ◽

Aki Yamamoto ◽

Tadao Ichita ◽

Haruki Tatsuta

Keyword(s):

Life History ◽

Clutch Size ◽

Maternal Care ◽

Female Body ◽

Egg Size ◽

Life History Traits ◽

Interspecific Variation ◽

Japanese Species ◽

Comparative Analyses ◽

The Family

AbstractLife history traits, such as clutch size, egg size (weight), developmental periods of eggs, and female body (abdomen) size, were investigated in Japanese species of the genus Elasmostethus Fieber (Hemiptera: Acanthosomatidae): E. amabilis Yamamoto, E. brevis Lindberg, E. humeralis Jakovlev, E. interstinctus (Linnaeus), E. kerzhneri Yamamoto, and E. nubilus (Dallas). With the exception of clutch size, significant differences were observed in the traits among species. No species exhibited maternal care of eggs. These data form a solid basis for future comparative analyses in the family Acanthosomatidae, which contains both subsocial and asocial species.

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Karyotypic characterization of some Liolaemus lizards in Chile (Iguanidae)

Genome ◽

10.1139/g89-461 ◽

1989 ◽

Vol 32 (3) ◽

pp. 393-403 ◽

Cited By ~ 12

Author(s):

Madeleine Lamborot ◽

E. Alvarez-Sarret

Keyword(s):

Population Genetics ◽

Pericentric Inversion ◽

Diploid Number ◽

Cytological Study ◽

Interspecific Variation ◽

Species Level ◽

Chromosomal Variation ◽

The Family ◽

Karyotypic Variation

A comparative cytological study of 10 taxa of Liolaemus from different localities in Chile shows that several of them display a conservative karyotype, with six pairs of macrochromosomes similar in size and shape to other species within Liolaemus that are believed to be primitive in the family. These karyotypes may exhibit interspecific variation in the number and shape of the microchromosome pairs 7, 8, and 9 and in the chiasmata characteristics, thus permitting chromosomal characterization at the species level. Other taxa show an increased diploid number of chromosomes, mainly explained by Robertsonian derivation, pericentric inversion, translocation, and triploidy. One species presents intraspecific chromosomal variation. Thus, chromosomes can serve as genetic markers and improve our understanding of the evolution, systematics, and population genetics of these iguanids.Key words: Liolaemus (Iguanidae), karyotypic variation, chiasmata, triploidy.

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Phenotypic differentiation of Barilius bendelisis (Cypriniformes: Cyprinidae) in four rivers from Central Indian Himalaya

Revista de Biología Tropical ◽

10.15517/rbt.v63i1.14252 ◽

2015 ◽

Vol 63 (1) ◽

pp. 165 ◽

Cited By ~ 2

Author(s):

Javaid Iqbal Mir ◽

Neha Saxena ◽

Rabindar Singh Patiyal ◽

Prabhati Kumari Sahoo

Keyword(s):

Factor Analysis ◽

Cold Water ◽

Univariate Analysis ◽

Interspecific Variation ◽

Head Region ◽

Morphometric Characters ◽

Indian Himalaya ◽

The Family ◽

Barilius Bendelisis ◽

Leave One Out

Barilius bendelisis, commonly known as Indian Hill Trout is an upland water fish of South East Asia. It belongs to the family Cyprinidae and dwells in shallow, clear and cold water. In this study, the intraspecific variation of Barilius bendelisis, on the basis of morphometric characters, was investigated. Altogether, 402 specimens were collected from four rivers in the Central Indian Himalaya. A truss network was constructed by interconnecting 12 landmarks to yield 30 distance variables that were extracted from digital images of specimens using tpsDig2 and PAST software. Allometric transformed truss measurements were subjected to univariate analysis of variance, factor analysis and discriminant analysis. All variables exhibited significant differences between the populations. Altogether 88% of the specimens were classified into their original populations (81.98% under a ‘leave-one-out’ procedure). With factor analysis measurements of the head region, the middle portion and the caudal region had high loadings on the first and second axis. The results indicated that B. bendelisis has significant phenotypic heterogeneity between the geographically isolated regions of Central Indian Himalaya. We hypothesize that the marked interspecific variation in B. bendelisis is the result of local ecological conditions.

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Hypoxia tolerance thresholds for post-smolt Atlantic salmon: Dependency of temperature and hypoxia acclimation

Aquaculture ◽

10.1016/j.aquaculture.2013.08.024 ◽

2013 ◽

Vol 416-417 ◽

pp. 41-47 ◽

Cited By ~ 40

Author(s):

Mette Remen ◽

Frode Oppedal ◽

Albert K. Imsland ◽

Rolf Erik Olsen ◽

Thomas Torgersen

Keyword(s):

Atlantic Salmon ◽

Hypoxia Tolerance ◽

Hypoxia Acclimation

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Mechanisms and evolution of hypoxia tolerance in fish

Proceedings of The Royal Society B Biological Sciences ◽

10.1098/rspb.2008.1235 ◽

2008 ◽

Vol 276 (1657) ◽

pp. 735-744 ◽

Cited By ~ 162

Author(s):

Milica Mandic ◽

Anne E Todgham ◽

Jeffrey G Richards

Keyword(s):

Whole Blood ◽

Hypoxia Tolerance ◽

Subtidal Zone ◽

Strongly Correlated ◽

Variable Environment ◽

Extraction Capacity ◽

Intertidal Zones ◽

The Family ◽

Blood Haemoglobin ◽

Gill Surface Area

The ability of an organism to acquire O 2 from its environment is key to survival and can play an important role in dictating a species' ecological distribution. This study is the first, to our knowledge, to show a tight, phylogenetically independent correlation between hypoxia tolerance, traits involved in dictating O 2 extraction capacity and the distribution of a group of closely related fish species, sculpins from the family Cottidae, along the nearshore marine environment. Sculpins with higher hypoxia tolerance, measured as low critical O 2 tensions ( P crit ), inhabit the O 2 variable intertidal zones, while species with lower hypoxia tolerance inhabit the more O 2 stable subtidal zone or freshwater. Hypoxia tolerance is phylogenetically independently associated with an enhanced O 2 extraction capacity, with three principal components accounting for 75 per cent of the variation in P crit : routine O 2 consumption rate; mass-specific gill surface area; and whole blood haemoglobin (Hb)–O 2 -binding affinity ( P 50 ). Variation in whole blood Hb–O 2 P 50 is strongly correlated with the intrinsic O 2 -binding properties of the purified Hb while the differences in the concentration of the allosteric Hb modulators, ATP and GTP, provide a Hb system with substantial plasticity for survival in a highly O 2 variable environment.

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