共查询到20条相似文献,搜索用时 15 毫秒
1.
Amplified fragment length polymorphism (AFLP) and random amplified polymorphic DNA (RAPD) were employed to examine the genetic
relationship between Guizotia taxa, to suggest the taxonomic status of some of these taxa, and to identify their diagnostic markers. Results from AFLPs
and RAPDs share some features in common, both revealing G. scabra ssp. schimperi as the most closely related taxon to G. abyssinica, and indicating that G. arborescens and G. zavattarii are the most divergent taxa. Most of the diagnostic markers revealed in this study were specific to G. arborescens and G. zavattarii. Our analysis suggests that G. scabra ssp. scabra, G. scabra ssp. schimperi, Chelelu and Ketcha are separate species. In this study, AFLP was found to be superior to RAPD in detecting genetic variation,
in internal consistency of the data and in the fitness of its clusters to genetic similarity data. AFLPs revealed genetic
relationship between Guizotia taxa that is more inline with the cytogenetic and hybridization studies than that revealed by RAPDs. 相似文献
2.
InSun Kim 《American journal of botany》1987,74(8):1224-1238
Comparative leaf morphology and anatomy was examined in five species and four hybrids involving three genera of Hawaiian Madiinae (Asteraceae). The comparisons included Argyroxiphium grayanum, Dubautia ciliolata subsp. ciliolata, D. knudsenii subsp. knudsenii, D. scabra subsp. leiophylla, D. scabra subsp. scabra, and Wilkesia gymnoxiphium, and the hybrids A. grayanum × D. scabra subsp. leiophylla, D. ciliolata subsp. ciliolata × D. scabra subsp. scabra, D. knudsenii subsp. knudsenii × D. scabra subsp. leiophylla, and W. gymnoxiphium × D. scabra subsp. leiophylla. Foliar morphology, leaf tissue organization, and various characters of stomata and trichomes were compared, using epidermal peels, cross and paradermal sections, and clearings of leaves. Pronounced anatomical differences among these closely related taxa were characterized, and effects of hybridization on the expression of anatomical features were documented. Most comparisons of parents and hybrids revealed statistically significant differences in leaf size, distribution of adaxial and abaxial stomata, and marginal and surface trichomes. In most instances hybrids demonstrated intermediate status in their foliar characters, indicating that these features are inherited from both parents. However, differences in foliar characters were usually of sufficient magnitude to allow recognition of hybrids as well as parents. 相似文献
3.
Rosane G. Collevatti Raquel Estolano Silmara F. Garcia John D. Hay 《Tree Genetics & Genomes》2009,6(4):555-564
We investigated pollen dispersal and breeding structure in the tropical tree species Caryocar brasiliense Camb. (Caryocaraceae), using genetic data from ten microsatellite loci. All adult trees (101) within a patch of 8.3 ha were
sampled, and from these adults 18 open-pollinated maternal progeny arrays were analyzed (280 seeds from 265 fruits). Most
fruits presented only one seed (median equal to 1.000) and mean number of ripened seeds per fruit was 1.053 (SD = 0.828).
Our results showed that C. brasiliense presents a mixed-mating system, with 11.4% of self-pollination, multilocus outcrossing rate of t
m = 0.891 ± 0.025, and high probability of full-sibship within progeny arrays (r
p = 0.135 ± 0.032). Outcrossing rate and self-pollination varied significantly among mother trees. We could detect a maximum
pollen dispersal distance of ∼500 m and a mean pollen dispersal distance of ∼132 m. However, most pollination events (80%)
occurred at distances less than 200 m. Our results also indicated that pollen dispersal is restricted to a neighborhood of
5.4 ha with rare events of immigration (∼1% N
e
m = 0.35). C. brasiliense also presents a significant but weak spatial genetic structure (Sp = 0.0116), and extension of pollen dispersal distance was greater than seed dispersal (N
b = 86.20 m). These results are most likely due to the foraging behavior of pollinators that may have limited flight range.
The highly within-population synchronous flowering, high population density, and clumped distribution reinforce pollinator
behavior and affect residence time leading to a short-distance pollen dispersal. 相似文献
4.
Summary. γ-Aminobutyric acid (GABA), a major inhibitory neurotransmitter in the central nervous system, has several well-known physiological
functions and has been applied to the production of many drugs and functional foods. The technology of GABA production via
submerged fermentation by Streptococcus salivarius subsp. thermophilus Y2 was investigated in this paper. It indicated that the GABA production was related to the biochemical characteristics of
glutamate decarboxylase (GAD) of S. salivarius subsp. thermophilus Y2. After 24 h of fermentation at 37 °C, which is the suitable culture conditions for GAD-production, then the culture condition
were adjusted to the optimal temperature (40 °C) and pH (4.5) for the GAD reaction activity in biotransformation of cells
and pyridoxal 5′-phosphate (0.02 mmol/l) were added to the broth at the 48 h, the GABA production was increased up to 1.76-fold,
reaching 7984.75 ± 293.33 mg/l. The strain shows great potential use as a starter for GABA-containing yoghurt, cheese and
other functional fermented food productions.
Authors’ address: Zhao-Xin Lu, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, P.R.
China 相似文献
5.
Mulatu Geleta Endashaw Bekele Kifle Dagne Tomas Bryngelsson 《Plant Systematics and Evolution》2010,289(1-2):77-89
Parsimony-based phylogenetic analyses of the genus Guizotia were undertaken based on DNA sequence data from the following chloroplast DNA (cpDNA) regions: trnT-trnL, trnL-trnF, trnY-rpoB, trnC-petN, psbM-trnD and rps16-trnQ intergenic spacers, trnL, rps16 and matK-5′trnK introns and matK gene. Out of the 26 primers used in this study, 14 were newly designed. The study was conducted to determine (1) the closest relative of Guizotia abyssinica, (2) the taxonomic status of some Guizotia taxa and (3) the subtribal placement of Guizotia in the tribe Heliantheae. The analyses of the sequence data showed that G. abyssinica, G. scabra ssp. scabra, G. scabra ssp. schimperi and G. villosa are phylogenetically closely related. However, G. scabra ssp. schimperi appeared as the most closely related taxon to G. abyssinica. Based on this phylogenetic analysis, we suggest that the two subspecies of G. scabra are better treated as separate species. The analysis also clearly demonstrated that “Chelelu” and “Ketcha” are distinct Guizotia species. The trnT-trnL and trnL-trnF intergenic spacer-based phylogenetic analysis of various subtribes of the tribe Heliantheae strongly supports the placement of the genus Guizotia within the subtribe Milleriinae. 相似文献
6.
J. O. Rasmussen S. Waara O. S. Rasmussen 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1997,95(1-2):41-49
Recipient protoplasts from three Solanum tuberosum genotypes, cv ‘Folva’ (2n=4x=48), cv ‘Matilda’ (4n) and ‘161 : 14’ (2n), were electrofused with X-ray-irradiated donor protoplasts
from two wild species S. spegazzinii (2n) or S. microdontum×S. vernei (2n). Prior to fusion, protoplasts were fluorescence-labelled with either fluorescein diacetate or scopoletin. Fusion products
were identified by dual fluorescence and selected by micromanipulation or fluorescence-activated cell sorting (FACS). All
putative hybrid plants were analysed by the random amplified polymorphic DNA (RAPD) technique. Our analysis demonstrates that
each asymmetric hybrid plant has an individual and stable profile of donor-specific RAPD bands. The irradiation of donor protoplasts
hampered the growth of selected heterofusion products in a dose-dependent way. Irradiation resulted in donor chromosome elimination,
but not in a dose dependent way, in the tested interval. In asymmetric hybrids with the S. spegazzinii donor 33–68% of the donor-specific RAPD bands were missing, indicating a similar level of chromosome elimination. In asymmetric
hybrid plants with the S. microdontum×S. vernei donor 74–95% of the donor RAPD bands were missing. Chromosome countings revealed that these hybrids had chromosome numbers
equal to or below the chromosome numbers found in the tetraploid recipients. This is the first time that highly asymmetric
hybrid plants between two tetraploid potato recipients and the donor S. microdontum×S. vernei have been obtained.
Received : 16 December 1996 / Accepted: 21 February 1997 相似文献
7.
The mating system, patterns of pollen mediated gene flow and levels of genetic contamination were investigated in a planted
stand of Acacia saligna subsp. saligna via paternity analysis using microsatellite markers. High levels of outcrossing were detected within the stand (t
m = 0.98), and the average pollen dispersal distance was 37 m with the majority of progeny sired by paternal trees within a
50-m neighbourhood of the maternal tree. Genetic contamination from the natural background population of A. saligna subsp. lindleyi was detected in 14% of the progeny of A. saligna subsp. saligna and varied among maternal trees. Long distance inter-subspecific pollen dispersal was detected for distances of over 1,500 m.
The results provide information for use in the breeding and domestication programme aimed at developing A. saligna as an agroforestry crop for the low rainfall areas of southern Australia. 相似文献
8.
Present cytological investigations from the cold desert regions of Lahaul-Spiti and Kinnaur (India) record the first ever
tetraploid (2n=32) chromosome count and cytomixis in Clematis orientalis L. var. acutifolia Hook. f. et Thoms. The phenomenon of cytomixis (9.33–29.80 %) involving chromatin transfer among 2–3 proximate pollen mother cells (PMCs)
during male meiosis occurs through narrow and broad cytoplasmic channels from early prophase to tetrad stage. However, frequency
of its occurrence during the later meiotic stages is rather low. Chromatin transfer results into the formation of hypo-, hyperploid
and enucleated PMCs. Various meiotic abnormalities associated with cytomixis such as chromatin stickiness, pycnotic chromatin,
interbivalent connections, out of plate bivalents, late disjunction of bivalents, and laggards and bridges resulted into some
pollen sterility (16.33–49.30 %) and heterogeneous pollen grains size. 相似文献
9.
Kizilpinar I Civelek E Tuncer A Dogan C Karabulut E Sahiner UM Yavuz ST Sackesen C 《International journal of biometeorology》2011,55(4):623-631
Pollen plays an important role in the development and exacerbation of allergic diseases. We aimed to investigate the days
with highest counts of the most allergenic pollens and to identify the meteorological factors affecting pollen counts in the
atmosphere of Ankara, Turkey. Airborne pollen measurements were carried out from 2005 to 2008 with a Burkard volumetric 7-day
spore trap. Microscope counts were converted into atmospheric concentrations and expressed as pollen grains/m3. Meteorological parameters were obtained from the State Meteorological Service. All statistical analyses were done with pollen
counts obtained from March to October for each year. The percentages of tree, grass and weed pollens were 72.1% (n = 24,923), 12.8% (n = 4,433) and 15.1% (n = 5,219), respectively. The Pinaceae family from tree taxa (39% to 57%) and the Chenopodiaceae/Amaranthaceae family from weed taxa, contributed the highest percentage of pollen (25% to 43%), while from the grass taxa, only the Poaceae family was detected from 2005 to 2008. Poaceae and Chenopodiaceae/Amaranthaceae families, which are the most allergenic pollens, were found in high numbers from May to August in Ankara. In multiple logistic
regression analysis, wind speed (OR = 1.18, CI95% = 1.02–1.36, P = 0.023) for tree pollen, daily mean temperature (OR = 1.10, CI95% = 1.04–1.17, P = 0.001) and sunshine hours (OR = 1.15, CI95% = 1.01–1.30, P = 0.033) for grass pollen, and sunshine hours (OR = 3.79, CI95% = 1.03–13.92, P = 0.044) for weed pollen were found as significant risk factors for high pollen count. The pollen calendar and its association
with meteorological factors depend mainly on daily temperature, sunshine hours and wind speed, which may help draw the attention
of physicians and allergic patients to days with high pollen counts. 相似文献
10.
Production of transgenic gentian plants by particle bombardment of suspension-culture cells 总被引:3,自引:0,他引:3
Cell suspension cultures were established from leaf explants of gentian (Gentiana triflora×G. scabra) for the generation of transgenic plants by particle bombardment. The parameters for the bombardment of suspension culture
cells with a particle gun were examined by monitoring the transient expression of a gene for β-glucuronidase driven by the
cauliflower mosaic virus (CaMV) 35S promoter. We found that prior culture of suspension culture cells for 5 days on solid
medium was optimum for successful particle bombardment. Putative transformed calli were obtained from bombarded cells after
a two-step selection procedure. Cells were cultured first with 30 mg l–1 hygromycin in liquid MS medium that contained 10 mg l–1
N-phenyl-N′-1,2,3-thiadiazol-5-yl urea, 1 mg/l 1-naphthaleneacetic acid and 30 g l–1 sucrose and then on solid medium prepared from the same liquid medium plus 2 g l–1 gellan gum. After 12 weeks of selection on solid medium that contained 30 mg l–1 hygromycin, two transgenic gentian plants were regenerated from each selected callus. Analysis by the polymerase chain reaction
and Southern blotting revealed the stable integration of transferred DNA.
Received: 3 June 1999 / Revision received: 21 September 1999 / Accepted: 20 September 1999 相似文献
11.
Streptomyces lividans 1326 carries inducible mercury resistance genes on the chromosome, which are arranged in two divergently transcribed operons.
Expression of the genes is negatively regulated by the repressor MerR, which binds in the intercistronic region between the
two operons. The merR gene was expressed in E. coli using a T7 RNA polymerase/promoter expression system, and MerR was purified to around 95% homogeneity by ammonium sulfate
precipitation, gel filtration and affinity chromatography. Gel filtration showed that the native MerR is a dimer with a molecular
mass of 31 kDa. Two DNA binding sites were identified in the intercistronic mer promoter region by footprinting experiments. No evidence for cooperativity in the binding of MerR to the adjacent operator
sequences was observed in gel mobility shift assays. The dissociation constants (KD) for binding of MerR were: binding site I, 8.5 × 10−9 M; binding site II, 1.2 × 10−8 M; and for the complete promoter/operator region 1 × 10−8 M. The half-life of the MerR-DNA complex was 19.4 min and 18.8 min for binding site I and binding site II, respectively.
The KD value for binding of mercury(II)chloride to MerR, again determined by mobility shift assay, was 1.1 × 10−7 M.
Received: 18 August 1998 / Accepted: 5 May 1999 相似文献
12.
白毛算盘子(叶下珠科)在中国无分布 总被引:1,自引:0,他引:1
长期以来,白毛算盘子(Glochidion arborescens Blume)被认为广布于中国云南西部至南部地区。该研究基于多年野外考察及标本查阅工作发现,由于白毛算盘子在中国的分布实为标本错误鉴定所致,相关错误鉴定的标本绝大部分属于绒毛算盘子[G.heyneanum(Wight&Arn.) Wight],少部分属于里白算盘子(G.acuminatum var.acuminatum Müll. Arg.)、毛果算盘子(G.eriocarpum Champ. ex Benth.)、艾胶算盘子[G.lancolarium(Roxb.) Voigt]或厚叶算盘子[G.zeylanicum var.tomentosum(Dalzell) Trimen]等物种,故在此将白毛算盘子在中国的分布予以排除。另外,对白毛算盘子进行了后选模式指定,并提供了白毛算盘子与相关混淆种的物种检索表。 相似文献
13.
Two vigorous transoceanic, bigeneric hybrids, Dubautia laevigata (n = 14) × Raillardiopsis muirii (n = 8) and [Dubautia knudsenii × laxa] (n = 14) × Madia bolanderi (n = 6), and one vigorous transoceanic trigeneric hybrid, Dubautia scabra (n = 14) × [M. bolanderi × R. muirii], between mainland tarweeds and Hawaiian silversword allies were artificially produced and subjected to cytogenetic analysis. In addition to univalents, ≈46–80% of the microsporocytes scored from these hybrids exhibited from one to four bivalents. However, some of the bivalents scored in the second bigeneric hybrid represented infragenomic association of Dubautia chromosomes. Stainable pollen of these hybrids ranged from 4.4 to 49%, mostly comprising large, tetracolporate, apparently diploid grains. The functionality of such grains was demonstrated in the primary hybrid M. bolanderi × R. muirii that was used to produce the trigeneric hybrid, and suggests the possible mode of origin of the Hawaiian genome via allopolyploidy. Illustrations of parents and F1s indicate that the hybrids produced in this study generally exhibit intermediate character states. However, the phenotypes of the “ray” flowers in hybrids between discoid and radiate species were noticeably unpredictable; in one case intermediacy appeared to be expressed largely in quantitative terms, while in two others intermediacy appeared to be expressed largely in qualitative terms. 相似文献
14.
We investigated whether variation in foliar endophyte frequency among mountain birch trees from different maternal families
was due in part to genetic differences among trees. The effect of different environmental conditions on the susceptibility
of these mountain birch families to foliar endophytes was tested. The 3-year study was conducted in two tree gardens (altitudinal
difference 180 m) with ten families of mountain birch. The frequency of the commonest endophytic fungus in mountain birch
leaves, Fusicladium sp., was significantly affected by mountain birch family, with the ranking of families relative to Fusicladium sp. frequency being consistent from environment to environment. Variation in the frequency of Melanconium sp. was difficult to interpret because of significant family × garden × year interaction. Fusicladium sp. and Melanconium sp. endophytes were most frequent in different tree individuals, families and gardens. We conclude that mountain birch trees
show heritable variation in their foliar endophyte frequency, and thus one of the conditions necessary for foliar endophytes
of mountain birch trees to be able to affect the evolution of their host plant is fulfilled. However, the effect of mountain
birch family on the frequency of endophytic fungi varies depending on the endophytic genera in question and partially also
on environmental conditions.
Received: 28 March 1998 / Accepted: 14 October 1998 相似文献
15.
In this study we construct a phylogenetic hypothesis for the relatedness among disjunct subspecies of Cyclamen repandum and its two allopatric congeners, C. creticum and C. balearicum in order to examine the evolutionary divergence of currently isolated populations across the western Mediterranean. The most
parsimonious phylogenetic tree obtained from sequencing the cpDNA trnL (UAA) intron suggests a major phylogeographic divide in southern Greece between two clades. The first clade comprises samples
of C. repandum subsp. peloponnesiacum (from the Peloponnese) and C. creticum (from Crete). The second comprises samples of C. repandum subsp. repandum (from Croatia, Italy, southern France, Corsica, Sardinia and Sicily), C. repandum subsp. rhodense (from Rhodes and Kos) and C. balearicum (from the Balearic Islands and southern France). These data suggest that C. creticum has evolved in allopatry from C. repandum subsp. peloponnesiacum and that C. balearicum and C. repandum ssp. rhodense have diverged from C. repandum subsp. repandum at its western and eastern distribution limits. At one small site on Corsica, a population of C. repandum may have introgressed with relictual populations of C. balearicum. These divergence patterns illustrate how a phylogenetic perspective can be used to better understand the evolution of endemism
in the Mediterranean flora.
Received February 19, 2001 Accepted August 22, 2001 相似文献
16.
Thea van de Mortel William Buttemer Peter Hoffman John Hays Andrew Blaustein 《Oecologia》1998,115(3):366-369
Ultraviolet-B (UV-B) irradiation of DNA generates mutagenic photoproducts such as cyclobutane pyrimidine dimers (CPDs) which
can affect the growth and development of amphibian embryos. Differential ability to repair UV-B-induced DNA damage may be␣responsible
for differences in population stability between␣some amphibian species. Photoreactivation via the enzyme photolyase is a major
mechanism used to remove CPDs from DNA. The aim of this study was to determine if photolyase activity differed in three sympatric
Australian amphibian species, one of which has suffered marked population declines (Litoria aurea) and two whose populations do not appear to be in decline (L. dentata and L. peronii). The specific activity of photolyase was measured in each species and compared to the hatching success of their eggs under
unfiltered summer sunlight. The mean specific activities of photolyase were 1.10 ± 0.18 × 1011, 5.76 ± 1.01 × 1011, and 2.66 ± 0.15 × 1011 CPDs repaired per hour per microgram of egg protein extract, for L. aurea, L. dentata and L. peronii, respectively. When intrinsic differences in hatching success between species were controlled for, the relative percentage
hatching success under unfiltered sunlight of L. aurea (77%) was lower than that of L.␣peronii (91%) and L. dentata (98%); however, these values did not differ significantly. L. aurea had the lowest photolyase activity of the three species and showed a non-significant trend of reduced hatching success under
UV-B exposure.
Received: 15 December 1997 / Accepted: 9 March 1998 相似文献
17.
Because engineering of the 101.016-bp megaplasmid pKB1 of Gordonia westfalica Kb1 failed due to the absence of an effective transfer system, pKB1 was transferred by conjugation from G. westfalica Kb1 to a kanamycin-resistant mutant of Rhodococcus opacus PD630 at a frequency of about 6.2 × 10−8 events per recipient cell. Furthermore, pKB1 was transferred to G. polyisoprenivorans strains VH2 and Y2K and to Mycobacterium smegmatis by electroporation at frequencies of 5.5 × 103, 1.9 × 103, and 8.3 × 102 transformants per microgram plasmid DNA. The pKB1-encoded cadmium resistance gene cadA was used for selection in these experiments. Recombinant pKB1-containing G. polyisoprenivorans VH2 and M. smegmatis were then used to engineer pKB1. A kanamycin resistance cassette was inserted into the pKB1-encoded cadA gene, ligated to suicide plasmid pBBR1MCS-5, and the resulting plasmid was electroporated into plasmid-harboring strains.
Homologous recombination between cadA on suicide plasmid and the respective sequence in pKB1 led to its integration into pKB1. Thus, two selection markers were
accommodated in pKB1 to monitor plasmid transfer into Gordonia and related taxa for analysis of genes essential for rubber degradation and others. In this study, two transfer methods for
large plasmids and strategies for engineering of pKB1 were successfully applied, thereby, extending the tool box for Gordonia. 相似文献
18.
Z. M. Wang K. M. Devos C. J. Liu R. Q. Wang M. D. Gale 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1998,96(1):31-36
An RFLP-based map consisting of 160 loci was constructed in an intervarietal cross of foxtail millet [Setaria italica (L.) P. Beauv.], Longgu 25×Pagoda Flower Green. The map comprises nine linkage groups, which were aligned with the nine foxtail
millet chromosomes using trisomic lines, and spans 964 cM. The intraspecific map was compared to an interspecific map, constructed
in a S. italica×S. viridis cross. Both the order of the markers and the genetic distances between the loci were highly conserved. Deviations from the
expected 1 : 2 : 1 Mendelian segregation ratios were observed in both the intra- and inter-specific populations. The segregation
data indicate that chromosome VIII in the Longgu 25×Pagoda Flower Green cross carries a gene that strongly affects gamete
fertility.
Received: 18 December 1996 / Accepted: 4 August 1997 相似文献
19.
Lipids are important entomopathogenic nematode nutritional components because they are energy reserves and serve as indicators
of nematode quality. The composition and concentration of the media lipid component determine bacterial and nematode yields.
Heterorhabditis bacteriophora and its symbiont, Photorhabdus luminescens, were cultured in media containing various lipid sources. As lipid concentration increased from 2.5% to 8.0% (w/v), the final
yield and productivity [calculated from the number of infective juveniles (IJ)] increased significantly from 2.1 × 105 IJ ml−1 to 2.8 × 105 IJ ml−1 (P < 0.05) and from 8.9 × 105 IJ l−1 day−1 to 11.8 × 105 IJ l−1 day−1 (P < 0.05), respectively. The nematode yield coefficient (IJ per gram of media), however, decreased from 2.8 × 106 to 2.2 × 106 (P < 0.05), while recovery increased from 45.3% to 58.0% (P < 0.05). Bacterial cell mass remained constant at 4.6 mg ml−1 with changing lipid content (P > 0.05). The largest nematode yield (2.8 × 105 IJ ml−1) was achieved within 8 days, using a medium containing an 8% (w/v) olive and canola oil (50:50 w/v) combination. Moreover,
developmental synchrony was achieved in this medium with 96% infective juveniles. In short, lipid sources rich in mono-unsaturated
fatty acids and poor in saturated fatty acids produced optimal nematode growth.
Received: 1 May 2000 / Received revision: 17 July 2000 / Accepted: 27 July 2000 相似文献
20.
Takaomi Arai Aya Kotake P. Mark Lokman Katsumi Tsukamoto 《Ichthyological Research》2003,50(2):190-194
The migratory history of Anguilla dieffenbachii and A. australis, collected from a coastal lake of New Zealand, was examined using analysis of strontium (Sr) and calcium (Ca) concentrations.
Line analysis of Sr : Ca ratios along the life history transect of each otolith showed a peak (Ca. 16–20 × 10−3) between the core and elver mark, which corresponded to the period of their leptocephalus and early glass eel stages in the
ocean. The mean Sr : Ca ratios from the elver mark to the otolith edge indicated that eels had different migratory histories,
which included freshwater residency in some eels (average Sr : Ca ratios, 1.7 × 10−3–2.4 × 10−3) but not in others (average Sr : Ca ratios, 3.1 × 10−3–6.5 × 10−3). These findings suggest that New Zealand freshwater eels have a flexible migration strategy and an ability to adapt to various
habitats and salinities.
Received: November 25, 2002 / Revised: January 17, 2003 / Accepted: January 17, 2003 相似文献