oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
O crescimento de Aegla leptodactyla Buckup & Rossi (Crustacea, Anomura, Aeglidae)
Noro, Clarissa K?hler;Buckup, Ludwig;
Revista Brasileira de Zoologia , 2003, DOI: 10.1590/S0101-81752003000200003
Abstract: the growth study, in length and weight, of aegla leptodactyla buckup & rossi, 1977, was developed based on biometric data of 2,435 specimens collected from rio da divisa, a tributary of the rio silveira, district of s?o josé dos ausentes, rio grande do sul state, brazil. the samplings were realized from april/2000 to july/2001. the captured specimens had recorded the sex and the length and width of cephalothorax. the specimens from june/2000, november and may/2001 were weighted, and those from june and july/2001 had recorded their length and width of the chelipeds. for the description of the growth the von bertalanffy's model was utilized. the growth curves in length (mm), for data obtained through the modal progression, are described by the equations: ct = 19.83 [1- e - 0,0023 (t +55,5)] for males and ct = 18.096 [1- e - 0,0024 (t +48,6)] for females. for data obtained through the progression of age group means, the equations for males and females are, respectively, ct = 18.15 [1- e - 0,0027 (t +52)] and ct = 20.7 [1- e - 0,002 (t +63,4)]. for the growth description in weight (g), for data obtained through modal progression, the equations are: pt = 3.88 [1- e - 0,0023 (t +55,5)]3,073 for males and pt = 2.78 [1- e - 0,0024 (t +48,6)]3,1046 for females, and for data obtained from progression of age group means: pt = 2.96 [1- e - 0,0027 (t +52)]3,073 (males) e pt = 3.65 [1- e - 0,002 (t +63,4)]3,1046 (females). the analysis of covariance did not record significant differences between the length of right and left chelae, of males and females.
Biologia reprodutiva e ecologia de Aegla leptoaectyla Buckup & Rossi (Crustacea, Anomura, Aeglidae)
Noro, Clarissa K?hler;Buckup, Ludwig;
Revista Brasileira de Zoologia , 2002, DOI: 10.1590/S0101-81752002000400011
Abstract: the crustaeeans of aeglidae family oeeur in south america's fresh water enviranments, featuring as important links in the food chains. the present article has the intention to give an acount of the results from investigations made from april/2000 to july/2001 on the biological and ecological features of aegla leptodactyla buckup & rossi, 1977, an endemic species from the headwaters of the rio pelotas basin in rio grande do sul state, brazil. the sampling was performed at the rio da divisa, tributary of rio pelotas, municipal district of s?o josé dos ausentes, rio grande do sul. the animais were collected with a hand net (pu?á) at four different sites of the river. high contents of dissolved oxygen was verified, with a medium value of 108% and alow conductivity (avarage of 13.7ms/cm). the water mean temperature was 16oc and the ph remained neutral, average of 7.5. the velocity of the water current varied from 0.54 to 0.78m/s. a total of 1,323 males and 1,112 females of a. leptodactyla was sampled. ovigerous females were observed from april through september and the smallest egg bearing female measured 14.09 mm cephalothorax length. the recruitment took place in november and december. the sex-ratio of the population was 1.19 males for 1 female.
Crescimento de Aegla longirostri Bond-Buckup & Buckup (Crustacea, Anomura, Aeglidae)
Silva-Castiglioni, Daiana da;Barcelos, Daniela F.;Santos, Sandro;
Revista Brasileira de Zoologia , 2006, DOI: 10.1590/S0101-81752006000200015
Abstract: the growth of aegla longirostri bond-buckup & buckup, 1994 was carried out from monthly samples at rio ibicuí-mirim, itaára, locality of val-de-serra, state of rio grande do sul, brazil, from september 1996 to august 1997. the sex and the cephalothorax length were recorded for each captured specimens. the growth study was estimated using the von bertalanffy's model. the growth curves in cephalothorax length (mm) for males and females are described, respectively, by the equations: lt = 27.9 [1 - e - 0.0069 (t + 24.78)] and lt = 21.45 [1 - e - 0.0048(t + 45.62)]. the maximum estimated age for males was one year and nine months and for females, two years.
O nicho trófico de duas espécies simpátricas de Aegla Leach (Crustacea, Aeglidae) no tributário da bacia hidrográfica do Rio Pelotas, Rio Grande do Sul, Brasil
Castro-Souza, Thais;Bond-Buckup, Georgina;
Revista Brasileira de Zoologia , 2004, DOI: 10.1590/S0101-81752004000400014
Abstract: freshwater anomurans of the aeglidae are restricted to tropical and temperate south america. some of the more than 60 known species are sympatric, among them aegla camargoi (buckup & rossi, 1977) and aegla leptodactyla (buckup & rossi, 1977), occur in the mountainous region of rio grande do sul, the southernmost brazilian state. the interactions between these two sympatric species, especially sharing of food resources, is still largely unknown; this is the reason this study was done. samples of each species were collected at 6 and 12 hour intervals during spring, summer, autumn and winter. the degree of fullness of their stomachs was calculated by the point method, frequency of occurrence of different types of food debris and feeding index. the breadth of the niche was estimated for each species using levins' index and the niche overlap with pianka's and schoener's methods. both species fed principally on macrophytes and immature insects of ephemeroptera, trichoptera, coleoptera and diptera. they feed anytime of the day with no seasonal differences. although the breadth of the trophic niche of each species showed small seasonal variations, the trophic niches of the two species overlapped during all seasons. these results suggest that these species are generalist omnivores and share food resources available in the environment.
Crescimento de Aegla jarai Bond-Buckup & Buckup (Crustacea, Anomura, Aeglidae)
Boos Jr, Harry;Silva-Castiglioni, Daiana da;Schacht, Karin;Buckup, Ludwig;Bond-Buckup, Georgina;
Revista Brasileira de Zoologia , 2006, DOI: 10.1590/S0101-81752006000200024
Abstract: the growth of aegla jarai was examined aiming to contribute with information about the bioecological profile of the species. the sampling was carried out at the espíngarda river system situated at the parque nacional da serra do itajaí, santa catarina state, brazil from july 2001 to september 2002. the sex and the length of cephalothorax (mm) were recorded and the specimens were brought back to the stream. the von bertalanffy's model was used to estimate growth based on the modal progression of the size, which resulted in the growth curves described by lt = 25.11 [1- e - 0.0082 (t + 29.02)] (for the males) and lt = 23.33 [1- e - 0.0048 (t + 46.45)] (for the females). the curves based on the means were also obtained which were lt = 23.56 [1- e - 0.0101 (t + 19] (for the males) and lt = 22.69 [1- e - 0.0052 (t + 40.95)] (for the females). the recruitment period extended throughout spring (october, november and december) and early summer (january). in the population of a. jarai the males attained larger sizes and a higher growth rate than females. the estimated longevity was two years for both sexes.
New species of Temnocephala Blanchard (Platyhelminthes, Temnocephalida) ectosymbiont on Aegla serrana Buckup & Rossi (Crustacea, Anomura) from southern Brazil  [cached]
Amato José Felipe Ribeiro,Amato Suzana B.,Daudt Luiz Carlos Campos
Revista Brasileira de Zoologia , 2003,
Abstract: A new species of the genus Temnocephala Blanchard, 1849 is described from southern Brazil, ectosymbiont on Aegla serrana Buckup & Rossi, 1977, an anomuran crustacean, collected in a creek and a reservoir of the highlands in the State of Rio Grande do Sul. All crustaceans examined were positive for this species of Temnocephala and carried eggs in different regions of the ventral side: perioral area, pleural strips, esternal plates, pereiopods and chelipods; to a lesser extent in the dorsal side of the cephalothorax and dorsal side of the uropods; as well as adult and young specimens. The most distinctive characters of the new species are: 1) cyanophilous glands forming an irregular-shaped, grape-like, bunch of approximately 10-15 cells, deeply staining with hematoxylin; 2) shape and size of the cirrus and its introvert section; 3) number, size and distribution of the rhabdite glands and 4) shape and position of the post tentacular, 'excretory' syncytial plates, with the off-centered nephridiopore.
New species of Temnocephala Blanchard (Platyhelminthes, Temnocephalida) ectosymbiont on Aegla serrana Buckup & Rossi (Crustacea, Anomura) from southern Brazil
Amato, José Felipe Ribeiro;Amato, Suzana B.;Daudt, Luiz Carlos Campos;
Revista Brasileira de Zoologia , 2003, DOI: 10.1590/S0101-81752003000300021
Abstract: a new species of the genus temnocephala blanchard, 1849 is described from southern brazil, ectosymbiont on aegla serrana buckup & rossi, 1977, an anomuran crustacean, collected in a creek and a reservoir of the highlands in the state of rio grande do sul. all crustaceans examined were positive for this species of temnocephala and carried eggs in different regions of the ventral side: perioral area, pleural strips, esternal plates, pereiopods and chelipods; to a lesser extent in the dorsal side of the cephalothorax and dorsal side of the uropods; as well as adult and young specimens. the most distinctive characters of the new species are: 1) cyanophilous glands forming an irregular-shaped, grape-like, bunch of approximately 10-15 cells, deeply staining with hematoxylin; 2) shape and size of the cirrus and its introvert section; 3) number, size and distribution of the rhabdite glands and 4) shape and position of the post tentacular, 'excretory' syncytial plates, with the off-centered nephridiopore.
Crescimento de Aegla manuinflata (Decapoda, Anomura, Aeglidae) em ambiente natural
Trevisan, André;Santos, Sandro;
Iheringia. Série Zoologia , 2011, DOI: 10.1590/S0073-47212011000300008
Abstract: the aim of this work was to evaluate the growth of aegla manuinflata bond-buckup & santos, 2009 in natural environment. samplings were monthly performed, from april/2006 to may/2007, in a tributary of ibicuí-mirim river, which belongs to the uruguay river basin, at s?o pedro do sul municipality, state of rio grande do sul, brazil. traps and dip nets were used to collect the animals. the specimens were sexed and had their cephalothoracic length (cl) measured, using a digital caliper with 0.01 mm precision. the growth was evaluated using the von bertalanffy model. the growth curves in length (mm), for the data obtained through the modal progression, are described by the equations: ct = 28.00 [1 - e-0.0047(t+10.63)] for males and ct = 25.16 [1 - e-0.0051(t+17.65)] for females. the maximum estimated age for males was three years and for females was two years and six months.
Aegla rosanae Campos Jr., um novo sin?nimo de Aegla paulensis Schmitt (Crustacea, Aeglidae)
Bond-Buckup, Georgina;Buckup, Ludwig;
Revista Brasileira de Zoologia , 2000, DOI: 10.1590/S0101-81752000000200008
Abstract: the validity of aegla rosanae campos jr., 1998 as a new species was analysed. on the basis of comparisons with aegla paulensis schmitt, a. rosanae was considered its junior synonym.
Dinamica populacional de Aegla platensis Schmitt (Crustácea, Decapoda, Aeglidae)
Bueno, Alessandra Angélica de Pádua;Bond-Buckup, Georgina;
Revista Brasileira de Zoologia , 2000, DOI: 10.1590/S0101-81752000000100005
Abstract: the crustaceans of the genus aegla leach, 1820, are found in streams, rivers of caves, current rivers and lagoons, from franca, s?o paulo, brazil (20o60's, 47o40'w), to ilha madre de dios (5uo01'10"s, 75o18'45"w), chile in south america. the crabs (aegla plalensis schmitt, 1942) were monthly sampled by hand fromjuly 1997 to september 1998 in arroio do mineiro, taquara (29o46's, 50o53'w), rio grande do sul, brazil. the sex, the length and width of the carapace were registered. after being collected the animais were returned to the stream. the repro-ductive period, the size at the first maturation and the sex-ratio were identifred. the reproductive period of a. platensis lasts the whole year. the percentage of ovigerous females is higher in july. the size at the first maturation is from 14,40 to 15,60 mm of carapace length. the sex-ratio is 1,08 male to 1 female. the annual population's density is 12 animais per square meter.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.