Biologia reprodutiva de Ligia exotica (Crustacea, Isopoda, Ligiidae) em Rio Grande, Rio Grande do Sul, Brasil

Com o objetivo de elucidar alguns aspectos da biologia reprodutiva de Ligia exotica Roux, 1828, duas populações que habitam o Estuário da Lagoa dos Patos (Molhe Oeste da Barra de Rio Grande e Ilha do Leonídeo) foram analisadas. A amostragem foi realizada quinzenalmente entre o verão/2003 e o inverno/2004. Os animais foram coletados manualmente durante uma hora. O período reprodutivo da espécie foi registrado para os meses de outubro a junho. Nenhuma fêmea ovígera foi observada de julho a setembro. No Molhe Oeste da Barra de Rio Grande, 5.376 indivíduos foram capturados (1.494 juvenis, 1.748 machos e 2.134 fêmeas, das quais 245 eram ovígeras). A proporção sexual estimada foi 0,78 (M:F). Para a análise da fecundidade, 178 fêmeas ovígeras com o marsúpio intacto foram analisadas. O comprimento total destas fêmeas variou entre 20,73 a 34,3 mm, e o número de ovos-embriões variaram de 33 a 142. O comprimento médio de primeira maturação sexual das fêmeas foi 24,65 mm e o número médio de ovos-embriões foi 88. Na Ilha do Leonídeo, 5.519 animais foram coletados (510 juvenis, 1.956 machos e 3.053 fêmeas, das quais 129 eram ovígeras). A proporção sexual foi 0,68 (M:F). Pequenas porcentagens de fêmeas ovígeras foram encontradas de setembro a maio, sendo a mais alta porcentagem observada no final de março. Neste local, 101 fêmeas ovígeras foram analisadas, com o comprimento total variando entre 17,62 a 28,61 mm e o número de ovos-embriões entre 25 e 113. O comprimento médio de primeira maturação sexual das fêmeas e o número médio de ovos-embriões foram, respectivamente, 21,43 mm e 73,8.

Environmental and grazing influence on spatial variability of intertidal biofilm on subtropical rocky shores

Epilithic biofilm on rocky shores is regulated by physico-chemical and biological factors and is important as a source of food for benthic organisms. The influences of environmental and grazing pressure on spatial variability of biomass of biofilm were evaluated on shores on the north coast of Sao Paulo State (SE Brazil). A general trend of greater abundance of microalgae was observed lower on the shore, but neither of the environmental factors evaluated (wave exposure and shore level) showed consistent effects, and differences were found among specific shores or times (September 2007 and March 2008). The abundance of slow-moving grazers (limpets and littorinids) showed a negative correlation with chlorophyll a concentration on shores. However, experimental exclusion of these grazers failed to show consistent results at small spatial scales. Observations of divergent abundances of the isopod Ligia exotica and biomass of biofilm on isolated boulders on shores led to a short exclusion experiment, where the grazing pressure by L. exotica significantly decreased microalgal biomass. The result suggests that grazing activities of this fast-moving consumer probably mask the influence of slow-moving grazers at small spatial scales, while both have an additive effect at larger scales that masks environmental influences. This is the first evaluation of the impact of the fast-moving herbivore L. exotica on microalgal biomass on rocky shores and opens an interesting discussion about the role of these organisms in subtropical coastal environments.

Environmental and grazing influence on spatial variability of intertidal biofilm on subtropical rocky shores

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Environmental and grazing influence on spatial variability of intertidal biofilm on subtropical rocky shores

Epilithic biofilm on rocky shores is regulated by physico-chemical and biological factors and is important as a source of food for benthic organisms. The influences of environmental and grazing pressure on spatial variability of biomass of biofilm were evaluated on shores on the north coast of São Paulo State (SE Brazil). A general trend of greater abundance of microalgae was observed lower on the shore, but neither of the environmental factors evaluated (wave exposure and shore level) showed consistent effects, and differences were found among specific shores or times (September 2007 and March 2008). The abundance of slow-moving grazers (limpets and littorinids) showed a negative correlation with chlorophyll a concentration on shores. However, experimental exclusion of these grazers failed to show consistent results at small spatial scales. Observations of divergent abundances of the isopod Ligia exotica and biomass of biofilm on isolated boulders on shores led to a short exclusion experiment, where the grazing pressure by L. exotica significantly decreased microalgal biomass. The result suggests that grazing activities of this fast-moving consumer probably mask the influence of slow-moving grazers at small spatial scales, while both have an additive effect at larger scales that masks environmental influences. This is the first evaluation of the impact of the fast-moving herbivore L. exotica on microalgal biomass on rocky shores and opens an interesting discussion about the role of these organisms in subtropical coastal environments.

First record of larvae of Allograpta exotica Wiedemann (Diptera, Syrphidae) preying on Aphis gossypii Glover (Hemiptera, Aphididae) in watermelon in Brazil

First record of larvae of Allograpta exotica Wiedemann (Diptera, Syrphidae) preying on Aphis gossypii Glover (Hemiptera, Aphididae) in watermelon in Brazil. Brazil is one of the largest world producers of watermelon (Citrullus lanatus Thumb. Mansf.) and Aphis gossypii Glover, 1877 (Hemiptera, Aphididae) is among the most important pest on this crop. Larvae of Allograpta exotica Wiedemann, 1830 (Diptera, Syrphidae) were found preying on A. gossypii in watermelon crop, in Santa Maria, Rio Grande do Sul State, what represents the first report of this tritrophic association in Brazil.

Possibilitas varia vegetabilia exotica fabricis nostris utilia in Finlandia colendi

Invocatio: Divina adsistente gratia.

Fauna exotica; mitteilungen aus dem gebiete der exotischen insektenwelt.

Supplement to Entomologische Zeitschrift.

Michaelis Bernhardi Valentini ... Pandectae medico-legales, sive Responsa medico-forensia ex archivis Academiarum celebriorum scriptisque probatissimorum medicorum deprompta ac... latinitate donata. Cum introductionibus generalibus... Accedunt authoris Declamationes panegyricae, Polychresta exotica et Dissert. epistolicae varii argumenti.

Mode of access: Internet.

Michaelis Bernhardi Valentini,... Pandectae medico-legales, sive Responsa medico-forensia ex archivis academiarum celebriorum scriptisque probatissimorum medicorum deprompta ac... latinitate donata. Cum introductionibus generalibus... Accedunt authoris Declamationes panegyricae, Polychresta exotica et Dissert. epistolicae varii argumenti.

Mode of access: Internet.

Michaelis Bernhardi Valentini ... Polychresta exotica in curandis affectibus contumacissimis probatissima, scil. fabae S. Ignatii china chinae, ipecacuanha clyster tabacinus, pedra del porco panacea gallorum, ut et nova herniarum cura : accedunt seorsim olim editae, nunc autem, ad desiderium plurimorum, conjunctim denuò prodeuntes dissertationes epistolicae varii argumenti cum fig. aeneis.

Mode of access: Internet.

Diptera exotica : pars I. Tabulis Aeneis Dualeis /

BM.

Iconographia botanica exotica, sive Hortus botanicus, imagines plantarum imprimis extra Europam inventuram colligens, cum commentario succincto editus.

Mode of access: Internet.

La bibla u la Sontga Scartira dil veder a Niev Testament, vertida en romonsch da la ligia grischa.

Translated from the Greek.

Caroli Dufresne, domini Du Cange, ... Glossarium ad scriptores mediae & infimae latinitatis : in quo latina vocabula novatae significationis, aut usus rarioris, barbara & exotica explicantur, eorum notiones & originationes reteguntur : complures aevi medii ritus & mores, legum, consuetudinum municipalium, ...

ICCU,