Japanese Sand Lance Ammodytes Personatus Research Articles

Sequencing Analysis of the Mitochondrial Genome of Japanese Sand Lance Ammodytes personatus Based on Next-Generation Sequencing Technology

Sequencing Analysis of the Mitochondrial Genome of Japanese Sand Lance Ammodytes personatus Based on Next-Generation Sequencing Technology

Population genetic structure and selective pressure on the mitochondrial ATP6 gene of the Japanese sand lance Ammodytes personatus Girard

AbstractThermoregulation has been suggested to influence mitochondrial DNA (mtDNA) evolution. Previous studies revealed that the mitochondrial protein-coding genes of fish living in temperate climates have smallerdN/dS(Non-synonymous substitution rate/Synonymous substitution rate) than tropical species. However, it is unknown whether different geographic populations of one fish species experience stronger selective pressures between cold and warm climates. The biological characteristics of the Japanese sand lance,Ammodytes personatusin the North-western Pacific is well-suited for assessing the performance of mtDNA evolution among separate geographic populations. In this study, we focused on the mitochondrial ATP6 gene ofA. personatususing 174 individuals from eight different sea temperature populations. Two distinct haplotype lineages and a significant population structure (P= 0.016) were found in this species. The frequencies of the two lineages varied with the changes of annual sea temperature. The southern lineage (lineage A,dN/dS= 0.0384) showed a largerdN/dSvalue than the northern lineage (lineage B,dN/dS= 0.0167), suggesting that sea temperature greatly influences the evolution of the two lineages. The result provides robust evidence of local adaptation between populations inA. personatus.

Assessing the Speciation of a Cold Water Species, Japanese Sand Lance Ammodytes personatus, in the Northwestern Pacific by AFLP Markers.

Simple SummaryAssessing the status of multiple highly divergent mitochondrial DNA (mtDNA) lineages and delimiting the evolutionarily significant units (ESUs) are the foundation of forecasting the influence of climate change on intraspecific genetic variation. In this study, we employed AFLP to investigate the genetic structure of Ammodytes personatus and compared the genetic variation of A. personatus in different ocean current systems. The incongruence between nuclear clades and previous mitochondrial lineages suggested that A. personatus is indeed composed of at least two genetically divergent cryptic species. Our results demonstrate that intra-species diversity should be taken into account to assess the influence of climate change on species. This study also highlights the value of the natural physical setting created by warm and cold ocean currents in eliciting a correlation between temperature and species distribution. In future studies, the exact range of temperature in both groups must be assessed with a sufficient number of samples to predict the influences of global climate change on both groups.The use of molecular techniques in biodiversity research increasingly results in the recognition of multiple divergent mitochondrial DNA (mtDNA) lineages below the morphospecies level. However, the overlapping distribution of multiple divergent lineages raises the question of whether some of these lineages are in fact cryptic species. Assessing the status of these divergent lineages, delimiting evolutionarily significant units (ESUs), and identifying the dominant evolutionary and ecological drivers are critical components of successful wildlife conservation and management strategies. Amplified fragment length polymorphism (AFLP) markers were applied to characterize the phylogeography pattern of a cold water species, the Japanese sand lance Ammodytes personatus, in warm and cold ocean currents. A total of 211 individuals sampled from 12 populations through the species’ range, including samples from Kuroshio Current, Oyashio Current, Tsushima Current, and Yellow Sea, were analyzed. The Bayesian assignment probability test and Neighbor joining (NJ) analysis divided these populations into two genetically and geographically distinct clades (northern and southern clades) characterized by different sea surface temperatures. The incongruence between nuclear clades and previous mitochondrial lineages suggested that A. personatus is indeed composed of at least two genetically divergent cryptic species. Pleistocene glaciation isolation after secondary contact, local thermal adaptation, and isolation by distance may explain the observed geographic pattern of two cryptic species and genetic structure within clades.

Male and female Black-tailed Gulls Larus crassirostris feed on the same prey species but use different feeding habitats

Sexual segregation in foraging habitats and associated diet differences have been reported in many seabirds. These sexual distinctions can be caused by differences in competitive ability or nutritional requirements. Here, we investigated the diets of male and female Black-tailed Gulls Larus crassirostris by collecting regurgitations during the incubation period and examining foraging behaviours and habitat use via tracking with Global Positioning System data loggers. In both males and females, the regurgitations predominantly contained Japanese Sand Lance Ammodytes personatus. Females were more likely than males to make long foraging trips. Males frequently foraged in fishing ports and fish processing plants; however, females rarely foraged in these locations. Males favoured nearshore areas (< 50 m sea depth), whereas females expanded their foraging range to deeper areas near the ocean frontal zone. The observed sexual segregation in foraging habitat use despite consumption of the same prey might be derived from competitive exclusion by males, which have a larger body size and stronger competitive abilities than females, rather than from different nutritional requirements.

Annual Variation in Breeding Numbers of Two Gull Species in Response to Regional Stock Size and Local Availability of Japanese Sand Lance on Rishiri Island, Northern Japan

Abstract Breeding population abundance such as colony size of seabirds is not generally considered to be particularly sensitive to the annual dynamics of the food conditions because of the long life-span and high adult survival rate. However, in seabird species in which adults decide to breed or not depending on the food conditions, population abundance can respond sensitively to the annual variation in the food conditions. Here, we examine the effects of the regional annual stock abundance of Japanese Sand Lance Ammodytes personatus, and their local temporal availability during the egg-laying period on the size of a Black-tailed Gull Larus crassirostris and Slaty-backed Gull L. schistisagus, breeding colony over 12 years on Rishiri Island, northern Japan. The total number of nests of both gull species increased significantly with the regional annual stock abundance, but not with the local temporal availability of the sand lance. The number of Black-tailed Gull nests without eggs was significantly higher ...

Phylogeography Study of Ammodytes personatus in Northwestern Pacific: Pleistocene Isolation, Temperature and Current Conducted Secondary Contact

To assess the role of historical process and contemporary factors in shaping population structures in Northwestern Pacific, mitochondrial control region sequences were analyzed to characterize the phylogeography and population structure of the Japanese sand lance Ammodytes personatus. A total of 429 individuals sampled from 17 populations through the species' range are sequenced. Two distinct lineages are detected, which might have been divergent in the Sea of Japan and Pacific costal waters of Japanese Island, during the low sea level. Significant genetic structure is revealed between the Kuroshio and Oyashio Currents. However, significant genetic structure is also detected in the Sea of Japan, contracting expected homogenization hypothesis in Tsushima Current. The haplotype frequency of lineages in both sides of Japanese Island and significant genetic structure between north and south groups revealed that the distribution of lineage B and north group were highly limited by the annual sea temperature. The lack of lineage B in Qingdao population with low sea temperature reflects the sea temperature barrier. Lack of genetic structure in the south group and north group populations indicated that ocean currents within groups facilitated the dispersal of A. personatus.

瀬戸内海産イカナゴの死亡と再生産に及ぼす夏眠期における高水温飼育の影響

夏眠期の水温条件（24, 26 および 28℃）が瀬戸内海産イカナゴの死亡および再生産へ及ぼす影響を飼育試験により調べた。試験開始 3 ヵ月後の累積死亡率はそれぞれ 3.0, 13.7 および 29.7% で，水温が高いほど死亡率が高くなる傾向が認められた。12 月後半にはいずれの水温区においても概ね順調に成熟したが，28℃ 区ではよう卵数および精巣重量が低い傾向にあった。従って，天然海域においても夏眠期の高水温はイカナゴの死亡および再生産に悪影響を及ぼしている可能性が示唆された。

Seasonal and spatial variations in prey utilization and condition of a piscivorous flatfish Paralichthys olivaceus

AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AB 11:279-288 (2011) - DOI: https://doi.org/10.3354/ab00319 Seasonal and spatial variations in prey utilization and condition of a piscivorous flatfish Paralichthys olivaceus Takeshi Tomiyama1,3,*, Yutaka Kurita2 1Fukushima Prefectural Fisheries Experimental Station, Iwaki, Fukushima 970-0316, Japan 2Tohoku National Fisheries Research Institute, Shiogama, Miyagi 985-0001, Japan 3Present address: Soma Branch, Fukushima Prefectural Fisheries Experimental Station, Soma 976-0022, Japan *Email: tomiyama_takeshi_01@pref.fukushima.jp ABSTRACT: We investigated the diet and somatic condition of 5129 individual Japanese flounder Paralichthys olivaceus, 20 to 92 cm in total length, in the Joban area along the Pacific coast of Japan (36°40’N to 38°00’N) from 2001 to 2007. Japanese flounder with food in their stomachs (1668 individuals) consumed chiefly fishes (92% of stomach contents by weight). Predominant prey species were Japanese anchovy Engraulis japonica (54% of fishes by weight) and Japanese sandlance Ammodytes personatus (22%). Japanese anchovy were consumed by Japanese flounder year round except in March and April, when the anchovy migrate from the Joban area. In March and April, Japanese flounder frequently consumed Japanese sandlance, but only in the northern part of the Joban area (37°20’N to 38°00’N); Japanese flounder did not feed on this species and had less content in their stomachs in the southern area (36°40’N to 37°20’N), where the sandlance is absent. Somatic and hepatosomatic conditions of Japanese flounder in the northern area were better than those in the southern area in March and April, suggesting that such spatial and seasonal heterogeneities in prey availability affect the nutritional status of predators. KEY WORDS: Spatio-temporal variability · Prey availability · Body condition · Piscivory · Flounder · Generalized linear mixed models Full text in pdf format PreviousNextCite this article as: Tomiyama T, Kurita Y (2011) Seasonal and spatial variations in prey utilization and condition of a piscivorous flatfish Paralichthys olivaceus. Aquat Biol 11:279-288. https://doi.org/10.3354/ab00319 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AB Vol. 11, No. 3. Online publication date: February 23, 2011 Print ISSN: 1864-7782; Online ISSN: 1864-7790 Copyright © 2011 Inter-Research.

Seasonal and inter-annual oceanographic changes induce diet switching in a piscivorous seabird

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 393:273-284 (2009) - DOI: https://doi.org/10.3354/meps08192 Seasonal and inter-annual oceanographic changes induce diet switching in a piscivorous seabird Motohiro Ito1,*, Hiroshi Minami2, Yuzan Tanaka1, Yutaka Watanuki1 1Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato, Hakodate, Hokkaido, 041-8611, Japan 2National Research Institute of Far Seas Fisheries, 5-7-1 Shimizu, Shizuoka, 424-8633, Japan *Email: m-ito@fish.hokudai.ac.jp ABSTRACT: The structure of a marine food web can change quickly within seasons as well as inter-annually in response to physical oceanographic changes. In this study, we examined the relationship between temporal changes in the marine ecosystem of northern Hokkaido, Japan, and diets of rhinoceros auklets Cerorhinca monocerata breeding in this region. To obtain an integrated measure of changes in diet composition on short (days) and inter-annual (2004 and 2005) time scales, we used a 2-pronged approach. We examined (1) the diets of adults using stomach contents and stable isotope signatures in tissues, and (2) chick diets using the composition of bill-loads delivered to chicks. During the incubation period, the diet of adults comprised euphausiids (Thysanoessa longipes and T. inermis). During the chick-rearing period, the diet of adults was age 0 Japanese sandlance Ammodytes personatus and age 0 Japan Sea greenling Pleurogrammus azonus in the early period, but switched quickly (<10 d) to warm-water-preferring Japanese anchovy Engraulis japonicus when the warm Tsushima Current intruded into their foraging range. Adult blood plasma stable isotope ratios reflected these seasonal changes in stomach content. Diets did not differ between age categories. Furthermore, the timing of diet switching to anchovy differed inter-annually, and was about 10 d later in 2005 than 2004, reflecting a difference in the timing of the intrusion of warm water. We conclude that rhinoceros auklets respond sensitively to current-related rapid marine food web changes. KEY WORDS: Prey switching · Stable isotope signatures · Rhinoceros auklets · Anchovy · Tsushima Current Full text in pdf format PreviousNextCite this article as: Ito M, Minami H, Tanaka Y, Watanuki Y (2009) Seasonal and inter-annual oceanographic changes induce diet switching in a piscivorous seabird. Mar Ecol Prog Ser 393:273-284. https://doi.org/10.3354/meps08192 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 393. Online publication date: October 30, 2009 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2009 Inter-Research.

Reproductive potential and recruitment of sand lance Ammodytes personatus in Ise Bay, central Japan

Regular samplings of the Japanese sand lance Ammodytes personatus were carried out between 1991 and 2003 in Ise Bay in central Japan to estimate the number of adults, egg production and the number of recruits. The estimated minimum and maximum number of adults was 0.48 billion and 37.64 billion (78.4-fold variation). Age-one adults dominated in each year, and they comprised more than 80% of the total population in ten years out of the twelve years of observations. The total egg production ranged from 0.5 to 22.2 trillion (44.4-fold variation), and the total number of recruits ranged from 3.36 to 102.83 billion (30.6-fold variation). These interannual variations were both smaller than the interannual variations in the number of adults. As the total number of adults increased, the total egg production gradually became asymptotic at the saturation level, and the egg production per adult female decreased. In addition, the number of recruits per egg decreased as the total number of adults increased. It was suggested that both egg production and the initial process of mortality before recruitment exhibit density dependency.

Audiogram measurement based on the auditory brainstem response for juvenile Japanese sand lance Ammodytes personatus

In this study, the auditory thresholds for juvenile Japanese sand lance Ammodytes personatus were measured based on its auditory brainstem response (ABR). The amplitude of the ABR waveforms to a sound stimulus were larger than that of the electric background noise caused by general brainwaves and myogenic signals after the averaging procedure. Japanese sand lance responded to low frequency sounds between 128 Hz and 512 Hz with a sound pressure level of 115–125 dB. As the test frequency decreased, so did the auditory threshold level, and the level was about 116 dB at 128 Hz and 181 Hz. These results indicate that Japanese sand lance can detect low frequency sound but are less sensitive than other fish species. These high thresholds are probably caused by the lack of a swim bladder.

Microincrements of otoliths of the Japanese sand lance Ammodytes personatus during early life stages

Microincrements of otoliths of the Japanese sand lance Ammodytes personatus during early life stages