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Search Results: 1 - 10 of 117297 matches for " Ana Maria Costa-Leonardo "
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The frontal weapon of the termite Armitermes euamignathus Silvestri (Isoptera, Termitidae, Nasutitermitinae)
Costa-Leonardo, Ana Maria;
Revista Brasileira de Zoologia , 2001, DOI: 10.1590/S0101-81752001000200012
Abstract: frontal weapon is the term used to designate the apparatus consisting of frontal gland and associated structures that participate in the chemical defense of termite soldiers. the ultra structure of the frontal gland and the scanning microscopy of the soldier head was investigated in the termite amiitermes euamignathus silvestri, 1901.campaniform sensilla was not observed but there were 80 to100 sensory bristles around the frontal pore. the glandular epithelium shows only class 1 cells according 10 the classification of noirot & quennedey (1974, 1991). the glandular cells are characterized by apical microvilli, a basal labyrinth and a large quantity of smooth endoplasmic reticulum which forms dense zones throughout the cytoplasm. the secretion is concentrated mainly in the basal pole of the cell and consists of large lipid droplets. the secretory epithelium is covered by a thick apical cuticle composed of a thin outer epicuticle, a layer of epicuticular filaments and a dense procuticle. the cytological results concerning the frontal pore showed a reduced cuticle and the presence of a subcuticular space where the lipid droplets are accumulated. the lack of class 3 cells and the presence of an intrinsic musculature are two anatomical features of the a. euamignathus frontal gland that will be important in the phylogenetic relationships of the nasutitermitinae.
The exocrine glands of swarming females and physogastric queens of Cornitermes cumulans (Kollar) (Isoptera, Termitidae, Nasutitermitinae)
Ignatti, Ana Cristina;Costa-Leonardo, Ana Maria;
Revista Brasileira de Zoologia , 2001, DOI: 10.1590/S0101-81752001000400007
Abstract: the histological study of the exocrine glands in the swarming females showed the presence of tergal glands, mandibular glands, salivary glands and sternal glands. tergal and sternal glands are not developed in the physogastric queens, probably, because of a regression process. the development of mandibular glands is similar in swarming females and physogastric queens.
Dynamics of Foraging and Recruitment Behavior in the Asian Subterranean Termite Coptotermes gestroi (Rhinotermitidae)
Alberto Arab,Yara carollo Blanco,Ana Maria Costa-Leonardo
Psyche , 2012, DOI: 10.1155/2012/806782
Abstract: The present study investigated the trail-following behavior of the subterranean termite Coptotermes gestroi (Wasmann Rhinotermitidae) under laboratory conditions. The results showed that workers were the first to initiate the exploration to the food source. When food was discovered they returned to the nest laying a trail for recruiting nestmates to the food source. In this situation, workers always traveled significantly faster when returning from the arenas. Both workers and soldiers were recruited to the food source; however, the soldier/worker proportion was higher during the first phase of the recruitment. When no food was available, the number of recruited nestmates and the speed on their way back to the nest were significantly lower. The results also showed that scout foragers always laid trail pheromones when entering into unknown territories, and that chemical signals found in the food could induce workers of C. gestroi to increase their travel speed. 1. Introduction The dynamics of the foraging and recruitment process in social insects has been investigated in many species within the Isoptera and the Hymenoptera. While many ants and bees also rely on optical cues, foraging in termites is organized predominantly by chemical signals, such as pheromone trails laid on the substrate for orientation and recruitment. The sternal gland is the only reported source of trail pheromone in termites. Secretions of this gland are considered to function in the recruitment of nestmates to source disturbance within the nest. Termites may also use trail-following pheromones to colonize new food sources [1, 2]. Termite trail-following pheromones are composed of one or few compounds. Up to date, only 9 compounds have been identified as trail pheromones in several termite species. For the termite families in which chemical trail pheromones have been reported, Rhinotermitidae, Termitidae, and Kalotermitidae seem to use mainly neocembrene A, (Z,Z,E)-dodeca-3,6,8-trien-1-ol, (Z)-dodec-3-en-1-ol, and (Z,Z)-dodeca-3,6-dien-1-ol [3–9]. Nasutitermes corniger uses in addition to these two compounds, trinervitatriene [8]; Mastotermitidae uses (E)-2,6,10-trimethyl-5,9-undecadien-1-ol and Termopsidae uses (E)-2,6,10-trimethyl-5,9-undecadien-1-ol, tricosane, and 4,6-dimethyldodecanal; whereas Glossotermes oculatus (Serritermitidae) uses nonecadienone for trail following [10, 11]. Termites also seem to use secretions of the sternal gland as both attractants and orientation signals in their foraging trails [12, 13], but the details of the chemical communication system used by
Recursos alimentares explorados pelos cupins (Insecta: Isoptera)
Lima, Juliana Toledo;Costa-Leonardo, Ana Maria;
Biota Neotropica , 2007, DOI: 10.1590/S1676-06032007000200027
Abstract: termites are social insects belonging to the order isoptera and constitute one of the dominant groups of invertebrates in terrestrial environments of the tropical region. currently, there are around 2,900 species described in seven families: mastotermitidae, kalotermitidae, termopsidae, hodotermitidae, serritermitidae, rhinotermitidae and termitidae. the neotropical region contains 537 species, and from these, approximately 300 occur in brazil and belong to the families kalotermitidae, rhinotermitidae, serritermitidae and termitidae. although the isoptera has been known by their potential as pest, the ecological role of the termites in the environment is primordial since they play a role as primary consumers and/or decomposers in natural ecosystems. these insects participate actively in the crushing, decomposition, humus production and mineralization of a variety of cellulose-based resources. a great diversity of organic material, in several stages of decomposition, may serve as food for termites, including wood (sound or decayed), grass, herbaceous plants, litter, fungi, nests built by other termite species, dung and carrion, lichen and even organic material present in the soil (humus). this vast range of food sources allowed the termites to occupy almost all the tropical and temperate regions of the earth, occurring practically in all the terrestrial environments, natural or modified by the human species. therefore, termites are found in the tropical and temperate forests, cerrados, savannas, caatingas, shallow places, mangrove regions, low vegetation stems, crops, pastures and urban environments.
Survey of the leg exocrine glands in termites(Isoptera)
Soares, Helena Xavier;Costa-Leonardo, Ana Maria;
Revista Brasileira de Entomologia , 2002, DOI: 10.1590/S0085-56262002000100001
Abstract: a survey of the leg exocrine glands in the termite workers of 16 species of the families kalotermitidae and termitidae was carried out through scanning electron microscope. glandular openings were not found in the legs of anoplotermes sp., ruptitermes sp. (apicotermitinae, termitidae) or glyptotermes planus (kalotermitidae), but they are present, spread over the ventral surface of the first, second and third tarsomeres of other termitidae such as armitermes euamignathus, cornitermes cumulans, nasutitermes coxipoensis, rhynchotermes nasutissimus, syntermes nanus, embiratermes festivellus (nasutitermitinae), amitermes beaumonti, hoplotermes amplus, microcerotermes sp., neocapritermes opacus, orthognathotermes sp., spinitermes brevicornutus and termes sp. (termitinae). the pores are usually isolated but they can also be grouped inside a round depression. the occurrence of leg exocrine glands in the family termitidae is reported for the first time.
Morfologia do tubo digestivo nos cupins Heterotermes tenuis (Hagen) e Coptotermes havilandi Holmgren (Isoptera, Rhinotermitidae)
Barsotti, Raquel Cristina;Costa-Leonardo, Ana Maria;
Revista Brasileira de Zoologia , 2000, DOI: 10.1590/S0101-81752000000100017
Abstract: the digestive tube of workers of heterotermes tenuis (hagen, 1858) e coptotermes havilandi holmgren, 1911 was analysed under the anatomical view. the digestive tube of both species did not show conspicuous diferences in relation to the morphology, morphometry and the configuration of the digestive tube that were the aspects studied. the general organization of the digestive tube of these species show several similarity with other lower termites previously analysed.
Soldier head morphology of the Neotropical termites: Embiratermes festivellus Silvestri and Spinitermes brevicornutus (Desneux) (Isoptera, Termitidae)
Costa-Leonardo, Ana Maria;Barsotti, Raquel Cristina;
Revista Brasileira de Zoologia , 1996, DOI: 10.1590/S0101-81751996000200003
Abstract: heads of soldier termites belonging to the species embiratermes festivellus (silvestri, 1901) (termitidae, nasutitermitinae) and spinitermes brevicornutus (desneux, 1904) (termitidae, termitinae) were examined using scanning electron microscopy. individual glandular openings are present in the upper part of e. festivellus head and correspond to class 3 glandular cells. campaniform sensillae occur in both termite heads, but this sensorial structure was not observed in the nasus extremity of e. festivellus soldier.
Neotenic formation in laboratory colonies of the termite Coptotermes gestroi after orphaning
Ana Maria Costa-Leonardo,Alberto Arab,Fabiana Elaine Casarin
Journal of Insect Science , 2004,
Abstract: The termite Coptotermes gestroi (Wasmann, 1896) (Rhinotermitidae: Coptotermitinae) is an exotic species in Brazil and information concerning its reproductive developmental biology is scarce. We induced the formation of neotenics in laboratory colonies through orphaning experiments. Orphaning experiments were conducted in three-year old colonies of C. gestroi kept under laboratory conditions. After three months, eight nymphoid neotenics were observed in one colony after queen removal. Histological analysis showed that these neotenics were non-functional. The results suggest that these individuals may have arisen from the first nymphal instar (N1) or from an early N1 instar after one or two larval moults. Neotenics also were recorded on two incipient colonies of C. gestroi that lost the queen naturally.
Popula??o e território de forrageamento de uma col?nia de Heterotermes tenuis (Hagen) (Isoptera, Rhinotermitidae)
Camargo-Dietrich, Célia Regina Rodrigues de;Costa-Leonardo, Ana Maria;
Revista Brasileira de Zoologia , 2003, DOI: 10.1590/S0101-81752003000300006
Abstract: heterotermes tenuis (hagen, 1858) is a subterranean termite that cause damage in forests, crops and urban areas. the population and foraging territory of an urban colony were determined using triple mark-release-recapture technique. foraging population was estimated in 134,583 ± 5,803 individuals. the foraging territory encompassed an area of 175,5 m2 and the maxim linear foraging distance was 36 m.
Comportamento intra-específico do cupim Heterotermes tenuis (Hagen) (Isoptera, Rhinotermitidae) em condi??es de laboratório
Camargo-Dietrich, Célia R.R. de;Costa-Leonardo, Ana Maria;
Revista Brasileira de Zoologia , 2000, DOI: 10.1590/S0101-81752000000200013
Abstract: groups of heterotemies tenuis (hagen, 1858) from five infestation points were paired in bioassays to investigate the intercolony aggression. the combinations of arena sizes (petri dishes of 6.0 and 9.0 cm) and temperatures (25 and 28 oc) were assessed for effects on intraspecific agonism. agonistic behavior was scored positive in arena if more than half of the starting number of termites was dead and injured after 17 hours. after the intraspecific encounters it was possible to delimitate three colonies from the five infestation points. no significant differential survival was seen in two different arena sizes and two different temperatures. these assays indicate that the factors governing the agonistic behavior in h. tenuis are complex and seems to be dependent on environmental conditions and individual characteristies (age, size and caste).
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