International audienceThe seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these forests account for more carbon assimilation and storage than any other terrestrial ecosystem. Based on a unique combination of seasonal pan-tropical data sets from 89 experimental sites (68 include aboveground wood productivity measurements and 35 litter productivity measurements), their associated canopy photosynthetic capacity (enhanced vegetation index, EVI) and climate, we ask how carbon assimilation and aboveground allocation are related to climate seasonality in tropical forests and how they interact in the seasonal carbon cycle. We found that canopy photosynthetic capacity seasonality responds positively to precipitation when rainfall is < 2000 mm yr(-1) (water-limited forests) and to radiation otherwise (light-limited forests). On the other hand, independent of climate limitations, wood productivity and litterfall are driven by seasonal variation in precipitation and evapotranspiration, respectively. Consequently, light-limited forests present an asynchronism between canopy photosynthetic capacity and wood productivity. First-order control by precipitation likely indicates a decrease in tropical forest productivity in a drier climate in water-limited forest, and in current light-limited forest with future rainfall < 2000 mm yr(-1)

Influência de metazoários parasitas na morte de juvenis de Arapaima gigas (Schinz, 1822) criados em uma piscicultura na Amazônia Brasileira.Abstract. Influence of Metazoan Parasites in the Death of Juvenile Arapaima gigas (Schinz, 1822) Farmed in the Brazilian Amazon. One of the most serious problems in the production of Arapaima gigas in fish farms are the parasitic diseases, that influence negatively the quantity and quality of farmed fish and sometimes may lead to high mortalities, so the aim of this study was to identify the parasite species in 20 young A. gigas collected in a fish farm in the city of Manacapuru, Amazonas, Brazil and assess their influence on fish mortality through the use of parasitic indexes, distribution pattern and the relationship between the condition factor and parasite abundance. The fish, before dying, showed erratic swimming and breathing difficulties. After gill analysis, 1066 Monogenoidea were recorded and identified as Dawestrema cycloancistrium, parasitizing 100% of the analyzed fish with an average intensity of 53.3 ± 73.1 and presenting an aggregate distribution pattern in the hosts. Additionally, we also found one specimen of the Nematoda Goezia spinulosa and five specimens of the Acantocephala Polyacanthorhynchus macrorhynchus present in the gut. The low number of endoparasites along with the high values recorded for the relative condition factor (Kn) in A. gigas discards the possibility of fish death due to the influence of some endoparasites or nutritional deficiencies. However, behavioral manifestations, signs in the gills and high levels of D. cycloancistrium infestation makes this parasite responsible for the fish death. Resumo. Um dos problemas mais sérios na produção do pirarucu em pisciculturas são as doenças parasitarias, que influenciam negativamente na quantidade e qualidade dos peixes cultivados, podendo causar altas mortalidades, portanto, o objetivo do presente trabalho foi identificar as espécies de parasitas em 20 juvenis de Arapaima gigas coletados em uma piscicultura no município de Manacapuru, Amazonas, Brasil e avaliar suas influências na mortalidade dos peixes mediante o uso de índices parasitários, padrão de distribuição e a relação entre o fator de condição e a abundância parasitária. Os peixes antes de morrer apresentaram Revista Brasileira de Zoociências 18(2): 77-90. 2017 ISSN 1517-6770 78. Influência de metazoários parasitas na morte de juvenis de Arapaima gigas Revista Brasileira de Zoociências 18(2): 77-Revista Brasileira de Zoociências 18(2): 77-90. 2017 SANTANA et al.

&lt;p&gt;&lt;strong&gt;Abstract.&lt;/strong&gt; The seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these forests account for more carbon assimilation and storage than any other terrestrial ecosystem. Based on a unique combination of seasonal pan-tropical data sets from 89 experimental sites (68 include aboveground wood productivity measurements and 35 litter productivity measurements), their associate canopy photosynthetic capacity (enhanced vegetation index, EVI) and climate, we ask how carbon assimilation and aboveground allocation are related to climate seasonality in tropical forests and how they interact in the seasonal carbon cycle. We found that canopy photosynthetic capacity seasonality responds positively to precipitation when rainfall is &lt; 2000 mm.yr&lt;sup&gt;&amp;#8722;1&lt;/sup&gt; (water-limited forests) and to radiation otherwise (light-limited forests); on the other hand, independent of climate limitations, wood productivity and litterfall are driven by seasonal variation in precipitation and evapotranspiration respectively. Consequently, light-limited forests present an asynchronism between canopy photosynthetic capacity and wood productivity. Precipitation first-order control indicates an overall decrease in tropical forest productivity in a drier climate.&lt;/p&gt;

The Brasselet number of a function f with nonisolated singularities describes numerically the topological information of its generalized Milnor fibre. In this work, using the Brasselet number, we present several formulas for germs f : (X, 0) → (C, 0) and g : (X, 0) → (C, 0) in the case where g has a one-dimensional critical locus. We also give applications when f has isolated singularities and when it is a generic linear form.

RESUMOAs espécies de Isopoda da família Cymothoidae são encontradas parasitando a superfície do corpo, nadadeiras, cavidade bucal e branquial dos peixes, alimentando-se do sangue, muco, epitélio e tecido subcutâneo. Na Amazônia brasileira existem poucos estudos referentes à distribuição destes parasitas e seus hospedeiros. THE SPECIES OF ISOPODA (CRUSTACEA: CYMOTHOIDEA) PARASITES OF Serrasalmus altispinis MERCKX, JÉGU E SANTOS, 2000 (CHARACIFORMES: SERRASALMIDAE) COLLECTED IN AMAZON FLOODPLAIN LAKES, BRAZIL ABSTRACTThe Isopoda species belonging to the Cymothoidae family are found parasitizing the body surface, fins, oral cavity and gill of fish, feeding on blood, mucus, epithelial and subcutaneous tissue. In the Brazilian Amazon there are few studies on the distribution of these parasites and their hosts. Thus, the objective of this study was to identify the Isopoda species occurring in S. altispinis collected in Brazilian Amazon floodplain lakes. It was examined the outer surface of the body, fins, buccal and branchial cavity, inner wall of the operculum and openings in the abdomen of 60 S. altispinis. The individuals found were collected with fine brushes, stilletto, tweezers and fixed and preserved in ethanol 70 ° GL with 10% glycerin. There were identified two species parasitizing the gills: 16 individuals of Anphira branchialis, Thatcher, 1993, with a prevalence of 13.33% and an individual of Vanamea symetrica (Van Name, 1925) with a prevalence of 1.67%. The data obtained in this study increase the knowledge of the parasitic species in S. altispinis, being reported two new occurrences of A. branquialis and V. symetrica in a new host.