Áreas verdes urbanas contribuem para a qualidade de vida nas cidades uma vez que desempenham umimportante papel ambiental, paisagístico e psicossocial. O presente trabalho teve como objetivo realizar uma avaliaçãoqualitativa de três áreas verdes da cidade de Sobral-CE. A coleta de dados se deu por meio de um levantamentoorientado por uma planilha, onde foram avaliadas a disponibilidade e a qualidade dos equipamentos, considerando-seseis parâmetros. Os resultados indicaram que o parâmetro Arborização foi o mais bem avaliado nas três áreas.Parâmetros como Lazer e Conforto, no geral, não obtiveram um bom desempenho a partir critérios adotados.
The relationship between weight and size of individuals can be used to evaluate the status of a population, which is particularly useful for natural populations that are being exploited. Ucides cordatus occurs on the Atlantic coast of the American continent, from Florida (USA) to Santa Catarina (Brazil). This species is economically very important, most of all in the Northeastern area of Brazil, as well as in the Dominican Republic and Suriname. The objective of this study was to analyze life phases (‘fattening’, ‘matumba’, ‘milk-crab’, ‘maturation’ and ‘walking’) by use of the weight-length relationships, as well as temporal variations in this condition factor for each sex of U. cordatus. For this purpose, individuals were sampled monthly for twenty-four months at the Jaguaribe River estuary, Ceará State, Northeastern Brazil. The relationship between total weight and cephalothorax width was established using regression analysis, adjusted by a power equation. The dynamics of the condition factor were analyzed for each sex using the variation of its averages related to annual life cycle; this was done for each of the previously-mentioned phases. The relationship between total weight and cephalothorax width showed an isometric growth in males and negative allometric growth in females suggesting that, for the same reference size, males are heavier than females. When considering the average of the female condition factors, these were greater than those for males during the annual life cycle, except during the ‘maturation’ phase, which is the phase with a higher demand of energetic reserves for males. Annual variation of the condition factor in females presented no significant difference.
Biología poblacional del cangrejo de manglar Ucides cordatus (Decapoda: Ucididae) en un estuario tropical semiárido. The mangrove crab Ucides cordatus is an important resource of estuarine regions along the Brazilian coast. U. cordatus is distributed from Florida, USA, to the coast of Santa Catarina, Brazil. The species plays an important role in processing leaf litter in the mangroves, which optimizes the processes of energy transfer and nutrient cycling, and is considered a keystone species in the ecosystem. Population declines have been reported in different parts of the Brazilian coast. in the present study we evaluated aspects of the population structure, sex ratio and size at morphological sexual maturity. We analyzed 977 specimens collected monthly over 24 months (2010)(2011)(2012), in a mangrove of the Jaguaribe River, in the municipality of Aracati on the East coast of Ceará state, Northeastern Brazil. The study area has a mild semiarid tropical climate, with mean temperatures between 26 and 28 o C. The area is located within the eco-region of the semiarid Northeast coast, where mangroves occur in small areas and estuaries are affected by mesomareal regimes. The population structure was evaluated by the frequency distribution of size classes in each month, and the overall sex ratio was analyzed using the chi-square test. Size at morphological sexual maturity was estimated based on the allometry of the cheliped of the males and the abdomen width of the females, using the program REGRANS. The size-frequency distribution was unimodal in both sexes. The overall sex ratio (M: F) (1:0.6) was significantly different from 1:1. Analysis of the sex ratio by size class showed that the proportion of males increased significantly from size class 55-60mm upward, and this pattern persisted in the larger size classes. in the smaller size classes the sex ratio did not differ from 1:1. The size at morphological sexual maturity was estimated at a carapace width (CW) of 52mm and 45mm for males and females, respectively. Analysis of the population parameters indicated that the population of U. cordatus in the Jaguaribe River mangrove is stable. However, constant monitoring of the population is required to detect any changes in the population attributes that may affect this stability. Rev. Biol. Trop. 61 (4): 1721-1735. Epub 2013 December 01.Key words: allometry, population structure, fishery management, sex ratio, size at sexual maturity.The study of population biology furthers our understanding of the ecological stability of a species in a particular habitat (Castiglioni et al., 2006). Population parameters of brachyuran crabs have been investigated by analyzing the distribution of individuals in size class, sex ratio, range in size at sexual maturity, reproductive cycle, fecundity, and juvenile recruitment (Thurman, 1985;Díaz & Conde, 1989;Flores & Negreiros-Fransozo, 1999;Conde et al., 2000;Cobo, 2005;Litulo, 2005;Benetti et al., 2007;Bezerra & Mathews-Cascon, 2007;Kassuga et al., 2008;Gregati & Negreiros-Frans...
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