Artikler, rapporter og annet (arktisk og marin biologi)

DSpace/Manakin Repository

• Home
• Fakultet for biovitenskap, fiskeri og økonomi
• Institutt for arktisk og marin biologi
• Artikler, rapporter og annet (arktisk og marin biologi)

Artikler, rapporter og annet (arktisk og marin biologi)

The collection contains 122 document(s)

Browse by: Titles | Dates | Authors

Show author list

Share on Facebook

 

Recent additions

• Invasion genetics of vendace (Coregonus albula (L.)) in the Inari-Pasvik watercourse: revealing the origin and expansion pattern of a rapid colonization event

  Præbel, Kim; Gjelland, Karl Øystein; Salonen, Erno; Amundsen, Per-Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)

  [+]

  [-]

  Abstract:

  Species invasions can have wide-ranging biological and socio-economic effects and are generally unwanted by legislation. Identification of the source population as well as the ecology and genetics of both the invader population and the receiving community is of crucial importance. The rapid invasion of a small coregonid fish vendace (Coregonus albula) in a major northern European subarctic watercourse has resulted in a labile ecological situation in the receiving community. The ecological impact of the invasion has been thoroughly documented, but the genetics of the invasion remains to be explored. We analyzed the genetic diversity and divergence patterns among the two possible source populations from southern Finnish Lapland and three colonists populations within the Inari-Pasvik watercourse using ten microsatellite loci in order to (i) identify the most likely source of the invasion, (ii) reveal the dispersal pattern and genetic structure of the secondary expansion, and (iii) to investigate whether the initial introduction and the secondary expansion were associated with founder effects. We revealed that repeated translocation of vendace from Lake Sinettäjärvi into a tributary lake of L. Inari in 1964–1966 is the most plausible source for the invasion. Both the initial introduction and the secondary expansion were found not to be associated with significant founder effects. The secondary expansion followed a stepping stone pattern and the source and colonist populations of this expansion have undergone rapid genetic divergence within a period of 15–35 years (ca. 8–17 generations). The rapid divergence may be contributed to lack of gene flow among the source and colonist populations due to the extensive hydroelectric damming in the watercourse. Multiple introductions and substantial genetic variation in combination with the boom-and-bust population development of the species thus likely counteracted the founder effects as well as fueled the rapid establishment and expansion of this species within the Inari-Pasvik watercourse.

  URI:

  http://hdl.handle.net/10037/5103

  File(s) in this item: 1

  article.pdf   (1.670Mb)
• A shortcut method for sexing juvenile European sea bass, Dicentrarchus labrax L.

  Menu, B; Peruzzi, Stefano; Vergnet, A; Vidal, MO; Chatain, B (Journal article; Tidsskriftartikkel; Peer reviewed, 2005)

  [+]

  [-]

  Abstract:

  The objective of this study was to develop a rapid and effective method of sexing juvenile sea bass with minimum labour and material.To this end, the gonad squash mount technique was applied along with macroscopic techniques for sexing a large number of experimental fish at the age of 215-275 days post fertilization (p.f.). At this age, 90% of the 3894 fish could be unambiguously sexed by macroscopic examination of their gonads, whereas the remaining proportion was identified using squash mount preparations (10%). The accuracy of the observations was measured up to classical histology procedures. Undifferentiated gonads accounted for 0.1% of the total population only.The application of the squashmount technique holds out the prospect of considerable improvement in the efficiency and rapidity of current sexing techniques in sea bass.

  URI:

  http://hdl.handle.net/10037/5088

  File(s) in this item: 1

  article.pdf   (301.2Kb)
• Genetic investigation of swimbladder inflation anomalies in the European sea bass, Dicentrarchus labrax L.

  Peruzzi, Stefano; Westgaard, Jon-Ivar; Chatain, B (Journal article; Tidsskriftartikkel; Peer reviewed, 2007)

  [+]

  [-]

  Abstract:

  Although the aetiology of swimbladder inflation anomalies in important aquaculture species such as European sea bass D. labrax is not fully determined, culture conditions are commonly suggested as main contributory factors. Little information is available on whether swimbladder inflation has a genetic basis for its expression too. In this work, 24 full-sibling sea bass families from a 4 dams x 6 sires factorial crossing were reared under communal conditions. The larvae developing normal and abnormal (uninflated or hyperinflated) swimbladders were genotyped at four microsatellite loci, Labrax-3, Labrax-13, Labrax-17, Labrax- 29, and allocated to the individual breeders. Out of 273 offspring, 97% could be assigned to a single parental pair. The genotype and pedigree analysis showed an imbalance in family size due to differential survival of larvae with normally-inflated swimbladders, with the offspring generated from one dam and one sire being two- to three-fold superior to the other parents, respectively. In larvae with non-inflated swimbladder, significant differences in family size were observed only among half-sibling sire families, whereas in larvae with hyper-inflated swimbladder such differences were found both among half-sibling sire and dam families. The results suggest that paternally and maternally inherited factors may contribute to the expression of swimbladder anomalies in sea bass along with major environmental clues.

  URI:

  http://hdl.handle.net/10037/5087

  File(s) in this item: 1

  article.pdf   (424.3Kb)
• Haematological and physiological characteristics of diploid and triploid sea bass, Dicentrarchus labrax L.

  Peruzzi, Stefano; Varsamos, S; Chatain, B; Fauvel, C; Menu, B; Falguiere, JC; Severe, A; Flik, G (Journal article; Tidsskriftartikkel; Peer reviewed, 2005)

  [+]

  [-]

  Abstract:

  The purpose of this study was to determine whether diploid and triploid sea bass differed in terms of main haematological and physiological characteristics. Diploid and triploid fish were produced by sub-optimal pressure treatments and held in communal environments under standard rearing conditions. Total red blood cell count (RBCC), haemoglobin concentration (Hb), hematocrit (Hct), mean cell volume (MCV), mean cellular haemoglobin content (MCH), mean cell haemoglobin concentration (MCHC), plasma metabolites, osmotic pressure, gill Na+/K+-ATPase activity, electrolytes, cortisol, and 3,5,3′-triiodo-l-thyronine (T3), were measured and compared. Triploidisation in sea bass led to an increase in erythrocyte size (32% in cytoplasm surface area, and 50% in nucleus) and a decrease in erythrocyte number (∼34%). Haemoglobin and basal plasma cortisol levels were significantly lower in triploid sea bass than in diploids. There were also differences between ploidies in the plasma concentrations of some electrolytes, with triploids showing lower concentrations of K, Fe, Zn, S, and Cu than their diploid counterparts.

  URI:

  http://hdl.handle.net/10037/5086

  File(s) in this item: 1

  article.pdf   (172.6Kb)
• Body shape variation in meiotic gynogenetic and triploid sea bass, Dicentrarchus labrax

  Peruzzi, Stefano; Wiborg-Dahle, Stine; Haffray, Pierrick; Chatain, Beatrice; Primicerio, Raul (Journal article; Tidsskriftartikkel; Peer reviewed, 2010)

  [+]

  [-]

  Abstract:

  A method of geometric morphometrics was used to characterize body shape variation in meiotic gynogenetic and triploid sea bass in comparison with diploid controls. A total of 13 coordinate landmark data were recorded on the profile of 34-month-old control (n = 81), gynogenetic (n = 117) and triploid (n = 131) siblings generated from two females (A and B). Three main axes of morphometric variation were consistent, and these accounted for 60.8 and 57.6% of the total variability in females A and B, respectively. There were significant shape deviations of triploid and gynogenetic fish relative to the controls, and differences were particularly evident in the progeny of one female. Overall,triploids displayed a more slender shape than diploids, whereas gynogenetic fish were deeper bodied and had flexed caudal peduncles and cranial features. The results are discussed especially in relation to the characterization of triploid fish for commercial purposes.

  URI:

  http://hdl.handle.net/10037/5085

  File(s) in this item: 1

  article.pdf   (350.3Kb)

Search Munin

Browse

Help