Pub Date : 2004-01-01DOI: 10.1080/12265071.2004.9647763
Hoon Chung, Seokwan Cheong, Shi‐Ryong Park
In the breeding colony of black‐tailed gull, as nests of conspecific neighbors are very closely located, chicks are permanently exposed by sound and visual stimuli produced by adult conspecifics approaching their nests. The chicks, therefore, may need to learn ways to appropriately respond to their parents approach. In this study we experimentally manipulated sensory stimulation that is potentially provided by the parents to the offspring. Chicks incubated in the laboratory were exposed to a mew call of the conspecific adult. Then they were tested in three situations differing in sensory stimulation: 1) visual stimulation only, 2) auditory stimulation only, and 3) Simultaneous visual and auditory stimulations. We observed occurrence of different response of the chicks, which were categorized into three behaviors (begging call response, chirirah call and pecking behavior). We also investigated intensity of the chick's call in response to the different stimulations and the degree of response with age. The chicks exposed to only auditory stimulation made significantly more chirirah calls. The intensities (dB) of the mew call and chicks’ chirirah call were directly correlated. On the other hand, when chicks just saw the stuffed adult gull, they responded significantly more with a begging call and pecking behavior. In the situation of costimulation, the chicks responded with a begging call and pecking, but less frequently than visual stimulation only. The results suggest that young black‐tailed gulls use call repertories to properly respond to parents behavior. Such results suggest an evolutionary process for uncreasing their survival rate in a group breeding site.
{"title":"Communication of young black‐tailed gulls, larus crassirostris, in response to parent's behavior","authors":"Hoon Chung, Seokwan Cheong, Shi‐Ryong Park","doi":"10.1080/12265071.2004.9647763","DOIUrl":"https://doi.org/10.1080/12265071.2004.9647763","url":null,"abstract":"In the breeding colony of black‐tailed gull, as nests of conspecific neighbors are very closely located, chicks are permanently exposed by sound and visual stimuli produced by adult conspecifics approaching their nests. The chicks, therefore, may need to learn ways to appropriately respond to their parents approach. In this study we experimentally manipulated sensory stimulation that is potentially provided by the parents to the offspring. Chicks incubated in the laboratory were exposed to a mew call of the conspecific adult. Then they were tested in three situations differing in sensory stimulation: 1) visual stimulation only, 2) auditory stimulation only, and 3) Simultaneous visual and auditory stimulations. We observed occurrence of different response of the chicks, which were categorized into three behaviors (begging call response, chirirah call and pecking behavior). We also investigated intensity of the chick's call in response to the different stimulations and the degree of response with age. The chicks exposed to only auditory stimulation made significantly more chirirah calls. The intensities (dB) of the mew call and chicks’ chirirah call were directly correlated. On the other hand, when chicks just saw the stuffed adult gull, they responded significantly more with a begging call and pecking behavior. In the situation of costimulation, the chicks responded with a begging call and pecking, but less frequently than visual stimulation only. The results suggest that young black‐tailed gulls use call repertories to properly respond to parents behavior. Such results suggest an evolutionary process for uncreasing their survival rate in a group breeding site.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"459 1","pages":"295 - 300"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2004.9647763","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59656516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-01-01DOI: 10.1080/12265071.2004.9647766
A. Abol-Munafi, B. Tarn, M. Ambak, P. Ismail
A study was conducted to determine growth and survival rates of snakehead (Channa striata) larvae. Live foods such as Artemia salina naupiii, Moina micrura and bloodworm and artificial diet were given to larvae from 1–15 days after hatching as the 1st phase and from 15–30 days as the 2nd phase. In the 1st phase, the growth and survival rates of larvae fed with Artemia nauplii were significantly different from larvae fed with Moina (p<0.05) with values of 28.5 mg, 49% and 26.7 mg, 31%, respectively. Meanwhile, all larvae fed with bloodworm (Chironomus sp.) or artificial diet (49% protein) died within 10 days of experiment. For the 2nd phase, growth of the fry fed with Artemia or Moina differed significantly from that fed with bloodworm or pellet (200.1, 187.7, 109.6 and 8.2 mg, respectively). Specific growth rate (SGR) of larvae fed with Moina was higher than that of larvae fed with Artemia (17.9 and 17.4% day‐1 respectively) in the 1st phase. In the 2nd phase, SGRs of larvae fed with Artemia (12.7% day‐1) or Moina (11.5% day‐1) were significantly higher than those of larvae fed with bloodworm (8.3% day‐1) or dry diet (6.1% day‐1). Generally, Artemia and Moina were suitable food for snakehead larvae during the first month of their life, and artificial diet was much less acceptable and resulted in poor growth and survival.
{"title":"Effect of different diets on growth and survival rates of snakehead (channa striata bloch, 1797) larvae","authors":"A. Abol-Munafi, B. Tarn, M. Ambak, P. Ismail","doi":"10.1080/12265071.2004.9647766","DOIUrl":"https://doi.org/10.1080/12265071.2004.9647766","url":null,"abstract":"A study was conducted to determine growth and survival rates of snakehead (Channa striata) larvae. Live foods such as Artemia salina naupiii, Moina micrura and bloodworm and artificial diet were given to larvae from 1–15 days after hatching as the 1st phase and from 15–30 days as the 2nd phase. In the 1st phase, the growth and survival rates of larvae fed with Artemia nauplii were significantly different from larvae fed with Moina (p<0.05) with values of 28.5 mg, 49% and 26.7 mg, 31%, respectively. Meanwhile, all larvae fed with bloodworm (Chironomus sp.) or artificial diet (49% protein) died within 10 days of experiment. For the 2nd phase, growth of the fry fed with Artemia or Moina differed significantly from that fed with bloodworm or pellet (200.1, 187.7, 109.6 and 8.2 mg, respectively). Specific growth rate (SGR) of larvae fed with Moina was higher than that of larvae fed with Artemia (17.9 and 17.4% day‐1 respectively) in the 1st phase. In the 2nd phase, SGRs of larvae fed with Artemia (12.7% day‐1) or Moina (11.5% day‐1) were significantly higher than those of larvae fed with bloodworm (8.3% day‐1) or dry diet (6.1% day‐1). Generally, Artemia and Moina were suitable food for snakehead larvae during the first month of their life, and artificial diet was much less acceptable and resulted in poor growth and survival.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"8 1","pages":"313 - 317"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2004.9647766","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59656588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-01-01DOI: 10.1080/12265071.2004.9647765
B. Rashid, N. Manzoor, M. Amin, L. Khan
Fast kinetics of transient pH changes and difference spectrum formation have been investigated following mixing of ADP/ATP with partially purified plasma membrane PM‐ATPase of the pathogenic yeast Candida albicans in the presence of five nutrients: glucose, glutamic acid, proline, lysine, and arginine and two analogs of glucose: 2‐deoxy D‐glucose and xylose. Average hT‐absorption to release ratio, indicative of population of ATPase undergoing complete hydrolytic cycle, was found to be 0.27 for control. This ratio varied between 0.25 (proline) to 0.36 (arginine) for all other compounds tested, except for glucose. In the presence of glucose, H+‐absorption to release ratio was exceptionally high (0.92). While no UV difference spectrum was observed with ADP, mixing of ATP with ATPase led to a large conformationai change. Exposure to different nutrients restricted the magnitude of the conformationai change; the analogs of glucose were found to be ineffective. This suppression was maximal in the case of glucose (80%); with other nutrients, the magnitude of suppression ranged from 40–50%. Rate of H+‐absorption, which is indicative of E∼P complex dissociation, showed positive correlation with suppression of conformationai change only in the case of glucose and no other nutrient/analog. Mode of interaction of glucose with plasma membrane H+‐ATPase thus appears to be strikingly distinct compared to that of other nutrients/analogs tested. The results obtained lead us to propose a model for explaining glucose stimulation of plasma membrane H+‐ATPase activity.
{"title":"Effect of glucose, its analogs and some amino acids on pre‐steady state kinetics of ATP hydrolysis by PM‐ATPase of pathogenic yeast (candida albicans)","authors":"B. Rashid, N. Manzoor, M. Amin, L. Khan","doi":"10.1080/12265071.2004.9647765","DOIUrl":"https://doi.org/10.1080/12265071.2004.9647765","url":null,"abstract":"Fast kinetics of transient pH changes and difference spectrum formation have been investigated following mixing of ADP/ATP with partially purified plasma membrane PM‐ATPase of the pathogenic yeast Candida albicans in the presence of five nutrients: glucose, glutamic acid, proline, lysine, and arginine and two analogs of glucose: 2‐deoxy D‐glucose and xylose. Average hT‐absorption to release ratio, indicative of population of ATPase undergoing complete hydrolytic cycle, was found to be 0.27 for control. This ratio varied between 0.25 (proline) to 0.36 (arginine) for all other compounds tested, except for glucose. In the presence of glucose, H+‐absorption to release ratio was exceptionally high (0.92). While no UV difference spectrum was observed with ADP, mixing of ATP with ATPase led to a large conformationai change. Exposure to different nutrients restricted the magnitude of the conformationai change; the analogs of glucose were found to be ineffective. This suppression was maximal in the case of glucose (80%); with other nutrients, the magnitude of suppression ranged from 40–50%. Rate of H+‐absorption, which is indicative of E∼P complex dissociation, showed positive correlation with suppression of conformationai change only in the case of glucose and no other nutrient/analog. Mode of interaction of glucose with plasma membrane H+‐ATPase thus appears to be strikingly distinct compared to that of other nutrients/analogs tested. The results obtained lead us to propose a model for explaining glucose stimulation of plasma membrane H+‐ATPase activity.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"8 1","pages":"307 - 312"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2004.9647765","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59657008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-01-01DOI: 10.1080/12265071.2004.9647734
Soochul Park
This study provides evidence that expression of EphA8 receptor in NG108–15 cells results in a substantial increase in the number of neurite‐bearing cells. However, the EphA8‐induced neurite outgrowth does not require either ephrin‐A5 stimulation or ectopic expression of p110γPI‐3 kinase. In contrast, co‐expression of a lipid kinase‐inactive p110γ mutant together with EphA8 causes neurite retraction in the presence of ephrin‐A5 stimulation. This effect was not observed in the absence of ephrin‐A5 stimulation. Significantly, the tyrosine kinase activity of EphA8 is not important for either of these processes. Taken together, our results strongly suggest that p110γ PI‐3 kinase is critically involved in the regulatory process by which ephrin‐A5 exerts effects on the EphA8‐induced neurite outgrowth.
{"title":"The p110γ PI‐3 kinase is required for the mechanism by which the EphA8‐induced neurites are modulated by ephrin‐A5 engagement","authors":"Soochul Park","doi":"10.1080/12265071.2004.9647734","DOIUrl":"https://doi.org/10.1080/12265071.2004.9647734","url":null,"abstract":"This study provides evidence that expression of EphA8 receptor in NG108–15 cells results in a substantial increase in the number of neurite‐bearing cells. However, the EphA8‐induced neurite outgrowth does not require either ephrin‐A5 stimulation or ectopic expression of p110γPI‐3 kinase. In contrast, co‐expression of a lipid kinase‐inactive p110γ mutant together with EphA8 causes neurite retraction in the presence of ephrin‐A5 stimulation. This effect was not observed in the absence of ephrin‐A5 stimulation. Significantly, the tyrosine kinase activity of EphA8 is not important for either of these processes. Taken together, our results strongly suggest that p110γ PI‐3 kinase is critically involved in the regulatory process by which ephrin‐A5 exerts effects on the EphA8‐induced neurite outgrowth.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"97 1","pages":"57 - 63"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2004.9647734","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59655727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-01-01DOI: 10.1080/12265071.2004.9647758
H. Ko
The first zoea of Petrolisthes trilobatus Osawa, 1996, from a female collected in Japan is described and illustrated. Its morphological characteristics are compared with those of other known species of the genus Petrolisthes. The first zoea of P. trilobatus appears very similar to those of P. lamarckii, P. asiaticus and P. hastatus. However, it could be distinguished from the others in having a spine on the lower posterior margin of the carapace, three pairs of setae on the postero‐dorsal surface of the telson and minute spinules on the dorsal margins of the abdominal somites 2–5. Based on zoeal morphology, it is suggested that the zoeas of Petrolisthes could be divided into two groups: the first group (P. coccineus, P. moluccensis, P. lamarckii, P. trilobatus, P. asiaticus, P. hastatus, P. pubescens, P. tomentosus, and P. carinipes) and the second one (P. ohshimai, P. armatus, P. boscii, P. tridentatus, P. tonsorius, and P. japonicus).
{"title":"First zoea of petrolisthes trilobatus (crustacea: Decapoda: Anomura: Porcellanidae) hatched in the laboratory","authors":"H. Ko","doi":"10.1080/12265071.2004.9647758","DOIUrl":"https://doi.org/10.1080/12265071.2004.9647758","url":null,"abstract":"The first zoea of Petrolisthes trilobatus Osawa, 1996, from a female collected in Japan is described and illustrated. Its morphological characteristics are compared with those of other known species of the genus Petrolisthes. The first zoea of P. trilobatus appears very similar to those of P. lamarckii, P. asiaticus and P. hastatus. However, it could be distinguished from the others in having a spine on the lower posterior margin of the carapace, three pairs of setae on the postero‐dorsal surface of the telson and minute spinules on the dorsal margins of the abdominal somites 2–5. Based on zoeal morphology, it is suggested that the zoeas of Petrolisthes could be divided into two groups: the first group (P. coccineus, P. moluccensis, P. lamarckii, P. trilobatus, P. asiaticus, P. hastatus, P. pubescens, P. tomentosus, and P. carinipes) and the second one (P. ohshimai, P. armatus, P. boscii, P. tridentatus, P. tonsorius, and P. japonicus).","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"31 1","pages":"251 - 254"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2004.9647758","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59656268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-01-01DOI: 10.1080/12265071.2004.9647741
K. Kim, Jong Ho Park, S. Cho
Aminoalcoholphosphotransferase catalyzes the synthesis of phosphatidylcholine and phosphatidylethanolamine from diacylglycerol plus a CDP‐aminoalcohol such as CDP‐choline or CDP‐ethanolamine. Previously we suggested the presence of possible isoforms of this enzyme from Chinese cabbage roots and now report the cDNA cloning and expression analysis of AAPT3 encoding a third isoform of aminoalcoholphosphotransferase (AAPT3). AAPT3 contains an open reading frame of 1,176 bp coding for a protein of 392 amino acids. It shares 96 and 95% identity with Chinese cabbage AAPT1 and AAPT2, respectively, at the deduced amino acid level. The results from reverse transcriptase‐polymerase chain reaction analysis indicate that expression of AAPT3 is up‐regulated by low temperature as well as AAPT1 and AAPT2.
{"title":"Cloning and expression of a cDNA AAPT3 encoding aminoalcoholphosphotransferase Isoform from Chinese Cabbage","authors":"K. Kim, Jong Ho Park, S. Cho","doi":"10.1080/12265071.2004.9647741","DOIUrl":"https://doi.org/10.1080/12265071.2004.9647741","url":null,"abstract":"Aminoalcoholphosphotransferase catalyzes the synthesis of phosphatidylcholine and phosphatidylethanolamine from diacylglycerol plus a CDP‐aminoalcohol such as CDP‐choline or CDP‐ethanolamine. Previously we suggested the presence of possible isoforms of this enzyme from Chinese cabbage roots and now report the cDNA cloning and expression analysis of AAPT3 encoding a third isoform of aminoalcoholphosphotransferase (AAPT3). AAPT3 contains an open reading frame of 1,176 bp coding for a protein of 392 amino acids. It shares 96 and 95% identity with Chinese cabbage AAPT1 and AAPT2, respectively, at the deduced amino acid level. The results from reverse transcriptase‐polymerase chain reaction analysis indicate that expression of AAPT3 is up‐regulated by low temperature as well as AAPT1 and AAPT2.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"8 1","pages":"105 - 109"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2004.9647741","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59656470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-01-01DOI: 10.1080/12265071.2004.9647753
Yong Sun Lee, Yesu Jeon, Jonghoon Park, D. Hwang, Anindya Dutta
MicroRNA and siRNA (small interfering RNA), representative members of small RNA, exert their effects on target gene expression through association with protein complexes called miRNP (microRNA associated ribonucleoproteins) and RISC (RNA induced silencing complex), respectively. Although the protein complexes are yet to be fully characterized, human EIF2C2 protein has been identified as a component of both miRNP and RISC. In this report, we raised antiserum against EIF2C2 in order to begin understanding the protein complexes. An immunoblot result indicates that EIF2C2 protein is ubiquitously expressed in a variety of cell lines from human and mouse. EIF2C2 protein exists in both cellular compartments, as indicated by an immunoblot assay with a nuclear extract and a cytosolic fraction (S100 fraction) from HeLa S3 lysate. Depletion of EIF2C1 or EIF2C2 protein resulted in a decrease of microRNA, suggesting a possible role of these proteins in microRNA stability or biogenesis. We also prepared antiserum against dsRNA binding protein PACT, whose homologs in C. elegans and Drosophila are known to have a role in the RNAi (RNA interference) pathway. The expression of PACT protein was also observed in a wide range of cell lines.
{"title":"Expression of PACT and EIF2C2, Implicated in RNAi and MicroRNA pathways, in various human cell lines","authors":"Yong Sun Lee, Yesu Jeon, Jonghoon Park, D. Hwang, Anindya Dutta","doi":"10.1080/12265071.2004.9647753","DOIUrl":"https://doi.org/10.1080/12265071.2004.9647753","url":null,"abstract":"MicroRNA and siRNA (small interfering RNA), representative members of small RNA, exert their effects on target gene expression through association with protein complexes called miRNP (microRNA associated ribonucleoproteins) and RISC (RNA induced silencing complex), respectively. Although the protein complexes are yet to be fully characterized, human EIF2C2 protein has been identified as a component of both miRNP and RISC. In this report, we raised antiserum against EIF2C2 in order to begin understanding the protein complexes. An immunoblot result indicates that EIF2C2 protein is ubiquitously expressed in a variety of cell lines from human and mouse. EIF2C2 protein exists in both cellular compartments, as indicated by an immunoblot assay with a nuclear extract and a cytosolic fraction (S100 fraction) from HeLa S3 lysate. Depletion of EIF2C1 or EIF2C2 protein resulted in a decrease of microRNA, suggesting a possible role of these proteins in microRNA stability or biogenesis. We also prepared antiserum against dsRNA binding protein PACT, whose homologs in C. elegans and Drosophila are known to have a role in the RNAi (RNA interference) pathway. The expression of PACT protein was also observed in a wide range of cell lines.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"8 1","pages":"213 - 220"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2004.9647753","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59656110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-01-01DOI: 10.1080/12265071.2004.9647747
Ji Min Lee, Jin Mo Jeon, C. Chang
Two freshwater cyclopoid species including a new species are added to Korean copepod fauna: Ochridacyclops coreensis n. sp. and Itocyclops yezoensis (Ito, 1953). Both species were collected from the semi‐subterranean waters like springs and wells. The present paper deals with the description of the new species and the systematic accounts on the two species, based on the morphological character comparison with the related congeners.
在韩国桡足动物群中增加了两种淡水类，包括一新种:ochridyyclops coreensis n. sp.和Itocyclops yezoensis (Ito, 1953)。这两个物种都是从半地下的泉水和井中采集的。本文在与近缘同属植物形态学特征比较的基础上，对该新种进行了描述，并对两种进行了系统描述。
{"title":"Two semi‐subterranean copepods from Korea","authors":"Ji Min Lee, Jin Mo Jeon, C. Chang","doi":"10.1080/12265071.2004.9647747","DOIUrl":"https://doi.org/10.1080/12265071.2004.9647747","url":null,"abstract":"Two freshwater cyclopoid species including a new species are added to Korean copepod fauna: Ochridacyclops coreensis n. sp. and Itocyclops yezoensis (Ito, 1953). Both species were collected from the semi‐subterranean waters like springs and wells. The present paper deals with the description of the new species and the systematic accounts on the two species, based on the morphological character comparison with the related congeners.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"8 1","pages":"145 - 154"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2004.9647747","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59656150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-01-01DOI: 10.1080/12265071.2004.9647736
C. Sim, D. Kang
A study on marine sponges was conducted by SCUBA diving at Ulleungdo Island, Korea, from July 2001 to August 2003. Two species, Mycale (Naviculina) ulleugensis and Mycale (N.) neunggulensis, are new to science. Mycale (N.) ulleugensis n. sp. seems close to M. chungae based on the shape of spicules, but differs in the size of megascleres and sigmas, Mycale (N.) neunggulensis n. sp. seems close to M. flagellifer Vacelet and Vasseur in the type and size of spicules, but differs in the shape of naviculichela. Naviculichela I of M. flagellifer has a spine on the upper part of the felix.
2001年7月至2003年8月，在郁陵岛用水肺潜水对海绵进行了研究。两种Mycale (Naviculina) ulleugensis和Mycale (N.) neunggulensis是科学上的新物种。Mycale (N.) ulleugensis N. sp.在针状体的形状上与M. chungae相似，但在大针状体和sigmas的大小上不同;Mycale (N.) neunggulensis N. sp.在针状体的类型和大小上与M. flagellifer Vacelet和Vasseur相似，但在naviculichela的形状上不同。鞭毛虫的Naviculichela I在肢肢上部有棘。
{"title":"Two new species of the genus Mycale (Naviculina) (Poecilosclerida: Mycalidae) from Ulleungdo Island, Korea","authors":"C. Sim, D. Kang","doi":"10.1080/12265071.2004.9647736","DOIUrl":"https://doi.org/10.1080/12265071.2004.9647736","url":null,"abstract":"A study on marine sponges was conducted by SCUBA diving at Ulleungdo Island, Korea, from July 2001 to August 2003. Two species, Mycale (Naviculina) ulleugensis and Mycale (N.) neunggulensis, are new to science. Mycale (N.) ulleugensis n. sp. seems close to M. chungae based on the shape of spicules, but differs in the size of megascleres and sigmas, Mycale (N.) neunggulensis n. sp. seems close to M. flagellifer Vacelet and Vasseur in the type and size of spicules, but differs in the shape of naviculichela. Naviculichela I of M. flagellifer has a spine on the upper part of the felix.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"8 1","pages":"71 - 75"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2004.9647736","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59656319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-01-01DOI: 10.1080/12265071.2004.9647738
Daesik Park, J. McGuire, H. Eisthen
Male red‐spotted newts, Notophthalmus viridescens, use chemical cues to locate and select potential mates. To investigate whether large and small males respond differentially to chemical cues from conspecifics, we conducted a series of two‐choice Y‐maze tests with odorant stimuli from two large females (LF/LF), one large versus one small female (LF/SF), and one large female placed with four males versus one small female (LF+4M/SF). We found that males responded more rapidly in a LF/LF choice situation than in those involving LF/SF or LF+4M/SF. In addition, small males chose more quickly than did large males. These results suggest that both body size and odorant context affect the speed of odorant responses. By responding differentially to conspecific chemical cues, small males may arrive earlier at a courting area, increasing their chances of successfully guarding and mating with a female.
{"title":"Differential responses of large and small male red‐spotted newts, Notophthalmus viridescens, to conspecific chemical cues","authors":"Daesik Park, J. McGuire, H. Eisthen","doi":"10.1080/12265071.2004.9647738","DOIUrl":"https://doi.org/10.1080/12265071.2004.9647738","url":null,"abstract":"Male red‐spotted newts, Notophthalmus viridescens, use chemical cues to locate and select potential mates. To investigate whether large and small males respond differentially to chemical cues from conspecifics, we conducted a series of two‐choice Y‐maze tests with odorant stimuli from two large females (LF/LF), one large versus one small female (LF/SF), and one large female placed with four males versus one small female (LF+4M/SF). We found that males responded more rapidly in a LF/LF choice situation than in those involving LF/SF or LF+4M/SF. In addition, small males chose more quickly than did large males. These results suggest that both body size and odorant context affect the speed of odorant responses. By responding differentially to conspecific chemical cues, small males may arrive earlier at a courting area, increasing their chances of successfully guarding and mating with a female.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"8 1","pages":"81 - 87"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2004.9647738","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59656387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：