The Relative Growth of Hybrid Char (Salvelinus fontinalis × Cristivomer namaycush)

1954 ◽  
Vol 11 (5) ◽  
pp. 652-659 ◽  
Author(s):  
E. P. Slastenenko
Keyword(s):  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Parental Species ◽  
Parent Species ◽  
Relative Growth

Hybrid char from Banff were intermediate between the two parental species, lake trout and eastern book trout, in respect to relative growth of some characters; in others they approximated one or other of the parent species. However it was not possible to make comparisons with parent-species material of the same stock as the hybrids' parents and reared under the same conditions.

A Method of Selecting Trout Hybrids (Salvelinus fontinalis × S. namaycush) for Ability to Retain Swimbladder Gas

1970 ◽  
Vol 27 (1) ◽  
pp. 39-45 ◽  
Author(s):  
J. S. Tait
Keyword(s):  
Brook Trout ◽  
Large Scale ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Swimming Ability ◽  
Parent Species ◽  
Scale Selection ◽  
Early Maturing ◽  
Good Repeatability ◽  
Selection Of

A method was developed for selecting hybrid trout for deep-swimming ability, for use in a breeding program to combine in one strain the early-maturing character of brook trout (Salvelinus fontinalis) with the deep-swimming ability of lake trout (S. namaycush). The method involves testing hybrids in pressure tanks and selecting individuals that, like lake trout, retain most of their swimbladder gas during the test period. For a sample of F2 hybrids the range of pressures at which the fish floated when anaesthetized was almost entirely between the medians for samples of the two parent species. Successive tests of marked individuals showed good repeatability of flotation measurements. The method is concluded to be reliable for large-scale selection of fish with ability to retain swimbladder gas.

Inheritance of Thermal Resistance in Hybrids of Salvelinus fontinalis and S. namaycush

1973 ◽  
Vol 30 (3) ◽  
pp. 401-408 ◽  
Author(s):  
Peter Ihssen
Keyword(s):  
Brook Trout ◽  
Variance Component ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Genetic Model ◽  
Variance Component Analysis ◽  
Parent Species ◽  
Maternal Origin ◽  
Resistant Parent ◽  
Five Factors

The two reciprocal F1 hybrids of brook trout (Salvelinus fontinalis) and lake trout (S. namaycush) had similar times to death on exposure to several lethal high temperatures for a series of acclimation temperatures. These hybrids resembled the brook trout, the more resistant parent, more than the lake trout. The F2 hybrids were intermediate in resistance to the parent species, and the backcrosses intermediate between the F2 hybrids and the respective parents. After acclimation to 5 and 10 C, F2’s and backcrosses arising from the F1 hybrid of brook trout maternal origin were consistently higher in resistance than the F2 and backcrosses arising from the F1 hybrid of lake trout maternal origin. After acclimation to 20 C and above, differences associated with the maternal origin of the F1 hybrid were not found.The number of effective factors segregating was estimated using the techniques of variance component analysis. A genetic model with two codominant factors was found to fit the data for 5 and 10 C acclimation, and one with five factors and dominance of the brook trout factors was found to fit the data for the higher acclimation temperatures.

Fecundity and Egg Size of a Brood Stock of Salvelinus fontinalis × S. namaycush Hybrids (Splake)

1974 ◽  
Vol 31 (2) ◽  
pp. 217-220 ◽  
Author(s):  
G. B. Ayles
Keyword(s):  
Egg Size ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Lake Huron ◽  
Female Size ◽  
Brood Stock ◽  
Trout Population ◽  
Egg Diameter

Estimates of average egg diameter and average number of eggs per female from a brood stock of Salvelinus fontinalis × S. namaycush (splake) hybrids were 0.468 cm and 1169 eggs, respectively. Variation in egg size between females was attributable to variation in both size and age of the fish, whereas differences in fecundity were attributed only to differences in female size. At a given size a splake had more and larger eggs than have been reported for lake trout. The significance of the findings is discussed in relation to the reestablishment of a viable trout population in Lake Huron.

Dynamics in Year-Class Strength, Growth, and Calcified-Structure Size of Native Lake Trout (Salvelinus namaycush) Exposed to Moderate Acidification and Whole-Lake Neutralization

1992 ◽  
Vol 49 (S1) ◽  
pp. 102-113 ◽  
Author(s):  
John M. Casselman ◽  
John M. Gunn
Keyword(s):  
Water Quality ◽  
Direct Effect ◽  
Lake Trout ◽  
Calcium Content ◽  
Salvelinus Namaycush ◽  
Ambient Water ◽  
Intraspecific Interaction ◽  
Relative Growth ◽  
Class Strength

Accurate age-interpretation techniques were developed, using scales and otoliths, to examine the role of whole-lake neutralization in the resurgence of a lake trout (Salvelinus namaycush) fishery in Nelson Lake (pH 5.7) near Sudbury, Ontario. Calcified structures and data from 860 lake trout were collected from 1972 to 1987. The population was characterized by the regular cyclic occurrence of strong year classes, which were probably an effect of pulse angling, cyclic food abundance, and possibly intraspecific interaction. The majority (65.8%) of the lake trout caught in the exceptional winter fishery of 1980 (3.3 kg∙ha−1) were in the lake prior to liming in 1975–76. Young lake trout (up to age 4) of the 1975 and 1976 year classes grew bigger and had larger scales than other year classes from 1973 to 1977, coinciding with an increase in hypolimnetic zooplankton, probably related to improved water quality. Otoliths grew significantly larger and more translucent and exceeded relative growth of scales and body for all ages in 1976 (18% greater) and for the 1976 year class, confirming that otolith accretion can come from the ambient water because liming increased the calcium content by 33% that year, the only observed direct effect of the treatment.

A major sextet of mitochondrial DNA phylogenetic assemblages extant in eastern North American brook trout (Salvelinus fontinalis): distribution and postglacial dispersal patterns

1998 ◽  
Vol 76 (7) ◽  
pp. 1300-1318 ◽  
Author(s):  
Roy G Danzmann ◽  
Raymond P Morgan II ◽  
Matthew W Jones ◽  
Louis Bernatchez ◽  
Peter E Ihssen
Keyword(s):  
Mitochondrial Dna ◽  
Brook Trout ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Salvelinus Alpinus ◽  
Large Degree ◽  
Dispersal Patterns ◽  
Small Stream ◽  
South Central ◽  
Haplotype 1

Mitochondrial DNA (mtDNA) restriction fragment length polymorphisms (RFLPs) of 2422 brook trout (Salvelinus fontinalis) from 60 units (major drainages, small stream catchments, and isolated lakes) representing 155 populations in eastern North America were examined to test hypotheses regarding postglacial dispersal and recolonization. An analysis of molecular variance (AMOVA) indicated that 38.8% of the variation was partitioned among the units, while approximately 60% was distributed among populations (phiST = 59.3) compared with 40.7% within populations. This distribution of variation suggests a large degree of heterogeneity in population founding events and phylogeographic structuring in this species. Comparisons of mtDNA diversity between fish from putative refugial and recolonization zones for this species indicate that more than one refugial region contributed to northern recolonization. Haplotypic diversities in recolonized regions are greatest in south-central populations (i.e., southern Great Lakes region), while only one haplotype (haplotype 1) predominates in northern, western, and eastern postglacial zones. Large phylogenetic differences were found between northern and southern populations. Populations outside the zone of glaciation were the most genetically heterogeneous and were represented by fish from all six (A-F) of the major evolutionary clades identified. Only fish from the A, B, and C clades were found in glaciated regions, with C lineage fish restricted to south-central glaciation zones. Fish from the C clade are putatively the most ancestral lineage within the species based upon composite shared RFLPs with lake trout (Salvelinus namaycush) and Arctic char (Salvelinus alpinus).

scholarly journals Evidence of sound production by spawning lake trout (Salvelinus namaycush) in lakes Huron and Champlain

2018 ◽  
Vol 75 (3) ◽  
pp. 429-438 ◽  
Author(s):  
Nicholas S. Johnson ◽  
Dennis Higgs ◽  
Thomas R. Binder ◽  
J. Ellen Marsden ◽  
Tyler Buchinger ◽  
...  
Keyword(s):  
Acoustic Telemetry ◽  
Sound Production ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Salvelinus Namaycush ◽  
Spawning Period ◽  
Sound Recordings ◽  
Laboratory Flume ◽  
And Control

Two sounds associated with spawning lake trout (Salvelinus namaycush) in lakes Huron and Champlain were characterized by comparing sound recordings with behavioral data collected using acoustic telemetry and video. These sounds were named “growls” and “snaps” and were heard on lake trout spawning reefs, but not on a nonspawning reef, and were more common at night than during the day. Growls also occurred more often during the spawning period than the prespawning period, while the trend for snaps was reversed. In a laboratory flume, sounds occurred when male lake trout were displaying spawning behaviors: growls when males were quivering and parallel swimming and snaps when males moved their jaw. Combining our results with the observation of possible sound production by spawning splake (Salvelinus fontinalis × Salvelinus namaycush hybrid) provides rare evidence for spawning-related sound production by a salmonid or any other fish in the superorder Protacanthopterygii. Further characterization of these sounds could be useful for lake trout assessment, restoration, and control.

scholarly journals JOINT SEGREGATION OF BIOCHEMICAL LOCI IN SALMONIDAE. II. LINKAGE ASSOCIATIONS FROM A HYBRIDIZED SALVELINUS GENOME (S. NAMAYCUSH x S. FONTINALIS)

Genetics ◽  
1980 ◽  
Vol 95 (3) ◽  
pp. 707-726
Author(s):  
Bernie May ◽  
Mark Stoneking ◽  
James E Wright
Keyword(s):  
Brook Trout ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
De Novo ◽  
Homeologous Chromosome ◽  
Homeologous Chromosomes ◽  
Joint Segregation ◽  
Duplicate Loci ◽  
Haploid Complement

ABSTRACT The results of more than 300 parwise examinations of biochemical loci for joint segregation in brook trout (Salvelinus fontinalis) and in the hybridized genome of lake trout (S. namaycush) × brook trout are summarized. Nineteen loci have been assigned to the following eight linkage groupings on the basis of nonrandom assortment, including cases of both classical linkage and pseudolinkage: ODH with PMI with PGI-3, PGI-2 with SDH, ADA-1 with AGP-2, AAT-(1,2) with AGP-1 with MDH-I, MDH-3 with MDH-4, LDH-3 with LDH-4, IDH-3 with ME-2 and GUS with CPK-I. Pseudolinkage (an excess of nonparental progeny types) was observed only for male testcross parents. The results suggest that this phenomenon involves homeologous chromosome arms as evidenced by the de novo association of presumed duplicate loci in each case. Classical linkage has not been found for the five pairs of duplicate loci examined in Salvelinus, suggesting that not all of the eight metacentrics in the haploid complement involve fusions of homeologous chromosomes. Females consistently showed a greater degree of recombination.

scholarly journals Un nuevo híbrido en el género Antirrhinum L. (Plantaginaceae, Antirrhineae Chav.). A new hybrid in the genre Antirrhinum L. (Plantaginaceae, Antirrhineae Chav.). 

2016 ◽  
Vol 41 ◽  
pp. 155-162
Author(s):  
P. Pablo Ferrer-Gallego ◽  
Roberto Roselló ◽  
Emilio Laguna ◽  
Jaime Güemes
Keyword(s):  
Parental Species ◽  
Culture Conditions ◽  
Parent Species ◽  
Diagnostic Characters ◽  
Forestry Research ◽  
Spontaneous Process

Español.  Se describe Antirrhinum × inexpectans, hybr. nov. (Plantaginaceae, Antirrhineae Chav.) producto del cruzamiento espontáneo, en condiciones de cultivo, entre A. mollissimum (Pau) Rothm. y A. tortuosum Bosc ex Vent. Este híbrido ha sido localizado en los viveros del Centro para la Investigación y Experimentación Forestal-CIEF de la Generalitat Valenciana (Quart de Poblet, València, España) donde se han cultivado durante varios años los parentales, lo que ha permitido el proceso de hibridación espontánea entre ambos. Junto a la descripción y diagnosis de esta planta, se aporta una lámina y una tabla con los principales caracteres diagnósticos para diferenciarlo de las especies de las que procede.Inglés.  Antirrhinum × inexpectans, hybr. nov. (Plantaginaceae, Antirrhineae Chav.) is described herein coming from the spontaneous crossing, in culture conditions, between A. mollissimum (Pau) Rothm. and A. tortuosum Bosc ex Vent.: A. × inexpectans, hybr. nov. This hybrid has been found in the nurseries of the Centre for Forestry Research and Experimentation-CIEF of the Generalitat Valenciana (Quart de Poblet, Valencia, Spain). In this center, the culture of the two parent species for several years has allowed the spontaneous process of hybridization. A plant description and diagnosis, iconography and a table showing the main diagnostic characters to differentiate it from the two parental species is provided. 

Sorting out the muddle: taxonomy and nomenclature of Thymus ×porcii (Lamiaceae) and related nothotaxa, with comments on parent species delimitation

Phytotaxa ◽  
2021 ◽  
Vol 501 (1) ◽  
pp. 119-139
Author(s):  
VIKTOR O. NACHYCHKO ◽  
YEVHEN V. SOSNOVSKY
Keyword(s):  
Species Delimitation ◽  
Parental Species ◽  
Molecular Data ◽  
Forest Steppe ◽  
Original Material ◽  
Parent Species ◽  
Natural Hybrid ◽  
Separate Species ◽  
Diagnostic Traits

Thymus ×porcii is a natural hybrid between T. pannonicus and T. pulegioides, occurring within the co-occurrence range of its parental species in the forest and forest-steppe zones of Europe. Taxonomy and nomenclature of this hybrid present a longstanding puzzle due to the lack of critical evaluations of the original material as well as conflicting taxonomic interpretations of the parent taxa both at specific and intraspecific levels. The present paper attempts to clarify these issues, arguing against the synonymic treatment and/or consolidation of T. pannonicus and T. pulegioides, which is accepted in modern taxonomies apparently as a result of nomenclatural confusion related to T. pannonicus typification. Based on morphology and reported molecular data, it is proposed to treat T. pannonicus and T. pulegioides as separate species, each containing two varieties being well-distinguished by the presence or absence of leaf indumentum: T. pannonicus var. latifolius (glabrous leaves) and T. pannonicus var. pannonicus (pubescent leaves), and T. pulegioides var. pulegioides (glabrous leaves) and T. pulegioides var. vestitus (pubescent leaves). In view of such treatment, T. ×porcii is divided into three nothovarieties, representing natural crosses between different varieties of the parent species. Namely, in addition to the typical T. ×porcii nothovar. porcii [T. pannonicus var. latifolius × T. pulegioides var. pulegioides] (with T. ×pilisiensis and T. ×goginae as the taxonomic synonyms), we describe a new nothovariety T. ×porcii nothovar. calvariensis [T. pannonicus var. pannonicus × T. pulegioides var. pulegioides], and propose a new nomenclatural combination T. ×porcii nothovar. opizii [T. pannonicus × T. pulegioides var. vestitus] based on the previously published name T. ×opizii. On the basis of original material examination, two collections from BP are designated here as the lectotypes of T. ×porcii (≡ T. ×porcii nothovar. porcii) and T. ×pilisiensis respectively, and one specimen from PR is designated as the lectotype of T. ×opizii (≡ T. ×porcii nothovar. opizii). Main diagnostic traits of T. ×porcii nothovarieties and their parental taxa are compared and discussed.

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