Cephalic morphological variation in freshwater silversides Odontesthes hatcheri
 and Odontesthes bonariensis
 in Patagonia: introgression and ecological relationships

S. Crichigno; C. Conte-Grand; M. Battini; V. Cussac

doi:10.1111/jfb.12191

Cephalic morphological variation in freshwater silversides Odontesthes hatcheri and Odontesthes bonariensis in Patagonia: introgression and ecological relationships

Journal of Fish Biology ◽

10.1111/jfb.12191 ◽

2013 ◽

Vol 83 (3) ◽

pp. 542-559 ◽

Cited By ~ 8

Author(s):

S. Crichigno ◽

C. Conte-Grand ◽

M. Battini ◽

V. Cussac

Keyword(s):

Morphological Variation ◽

Ecological Relationships ◽

Odontesthes Bonariensis ◽

Odontesthes Hatcheri

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Temperature effects on sex differentiation of the reciprocal hybrids of Odontesthes bonariensis and Odontesthes hatcheri (Atherinopsidae)

Aquaculture Research ◽

10.1111/j.1365-2109.2010.02757.x ◽

2011 ◽

Vol 42 (6) ◽

pp. 746-753 ◽

Cited By ~ 7

Author(s):

Junpei Inazawa ◽

Ricardo Shohei Hattori ◽

Miho Oura ◽

Masashi Yokota ◽

Carlos Augusto Strüssmann

Keyword(s):

Temperature Effects ◽

Sex Differentiation ◽

Reciprocal Hybrids ◽

Odontesthes Bonariensis ◽

Odontesthes Hatcheri

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Effect of salinity on the oxygen consumption of larvae of the silversides Odontesthes hatcheri and O. bonariensis (Osteichthyes, Atherinopsidae)

Brazilian Archives of Biology and Technology ◽

10.1590/s1516-89132008000300017 ◽

2008 ◽

Vol 51 (3) ◽

pp. 563-567 ◽

Cited By ~ 6

Author(s):

Mônica Yumi Tsuzuki ◽

Carlos Augusto Strüssmann ◽

Fumio Takashima

Keyword(s):

Oxygen Consumption ◽

Yolk Sac ◽

Metabolic Demand ◽

Odontesthes Bonariensis ◽

Consumption Rates ◽

Odontesthes Hatcheri ◽

Reduced Activity

Starved larvae of the silversides O. hatcheri (2- and 5-days-old) and Odontesthes bonariensis (5-days-old) were used to compare the oxygen consumption rates at 0, 5, 10, 20 and 30 ppt salinity. Oxygen consumption of O. hatcheri and O. bonariensis was minimal at 0 and 10 ppt, respectively, salinities close to those encountered in areas inhabited by these fishes. In both species, oxygen consumption rates thereafter increased with increasing salinity, and then abruptly decreased at 30 ppt. Lower consumption at extreme salinities might be a result of reduced activity, which in itself was salinity-modulated. Differences in activity may explain the fact that oxygen consumption rates of 5-day-old larvae were higher than 2-day-old larvae, which still possess yolk-sac. In this case, starved larvae incurred in higher metabolic demand due to the continuous swimming in the search for food.

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Early morphological variation and induction of phenotypic plasticity in Patagonian pejerrey

Neotropical Ichthyology ◽

10.1590/s1679-62252012005000007 ◽

2012 ◽

Vol 10 (2) ◽

pp. 341-348 ◽

Cited By ~ 10

Author(s):

Sonia A. Crichigno ◽

Miguel A. Battini ◽

Víctor E. Cussac

Keyword(s):

Phenotypic Plasticity ◽

Morphological Variation ◽

Morphological Changes ◽

Developmental Time ◽

Shape Variation ◽

Linear Measurements ◽

Feeding Experiments ◽

Different Temperatures ◽

Higher Temperature ◽

Odontesthes Hatcheri

The aim of this work was to study two aspects of phenotypic plasticity in the Patagonian pejerrey Odontesthes hatcheri (Teleostei: Atherinopsidae) the dependence of the early morphology on developmental time and temperature, and the induction of morphological changes by controlled feeding in juveniles. Newly hatched free embryos, incubated at two different temperatures (13 and 18oC), and juveniles were used for the study and induction of phenotypic plasticity. Body and head shapes were analyzed with geometric morphometrics and linear measurements. Our results showed that shape variation at hatching was related to the bending of the embryo head on the yolk sac, increasing the head-trunk angle due to progressive straightening of the embryo. The head-trunk angle was related with temperature at incubation, with embryos incubated at higher temperature being more bent. Embryos that hatched earlier had bigger yolk sacs than those that hatched later. In juveniles, controlled feeding experiments added new morphological variation to that of wild juveniles. In all comparisons, the slenderness of the head, the size of premaxilla and jaw, and the position of the eye showed an enlarged variation due to controlled feeding. These results will contribute to comprehending the complexity of the morphological variation of O. hatcheri.

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