Coleção De Moluscos Do Museu De Ciências E Tecnologia Da Pucrs — Breve Relato

Abstract

e Scaphopoda, a maior parte proveniente do sul do Brasil. As duas primeiras classes são as mais representativas, com 96% do total. A coleção possui 10.650 lotes tombados e 164.674 espécimes, com representantes de espécies endêmicas, invasoras e ameaçadas de extinção. Neste artigo apresentam-se informações gerais sobre a composição do acervo. Palavras-chave: Mollusca; malacofauna; Rio Grande do Sul. ABSTRACTThe mollusks collection at the PUCRS Museum of Science and Technology has representatives of the classes Gastropoda, Bivalvia, Cephalopoda, Polyplacophora and Scaphopoda, mostly from the South of Brazil. The first two classes are the most heavily represented, comprising 96% of the catalogued lots. The collection comprises 10,650 lots and 164,674 specimens, and includes endemic, invasive and endangered species. An overview of the collection composition will be given.

Effects of fishing on the Serra Spanish Mackerel (Scomberomorus brasiliensis) in Northeast Brazil

“…Since the 1960s, the need to monitor Serra Spanish Mackerel stocks has been recognized, in light of unregulated exploitation of the species, mainly in relation to an increase in length of gillnets used, which reach up to 15 km (Mourão et al., 2014). Moreover, the prevalent capture of immature individuals is of concern, especially because stock production has been approaching maximum sustainable yield (MSY) in recent years (Alcântara Filho, 1972; Carneiro & Salles, 2011; Fonteles Filho, 1988; Lessa et al., 2004; Lucena et al., 2004; Mota Alves & Tomé, 1968).…”

“…Over time, Serra Spanish Mackerel suffered high fishing exploitation, with a maximum sustainable exploitation rate of 0.61 (Collette et al., 2011; Lucena et al., 2004; Nóbrega & Lessa, 2009). In Northeast Brazil, average total length decreased from 50.3 cm in 1998 to 38.2 cm in 2001 (Nóbrega & Lessa, 2009), as mesh size declined to catch immature individuals (Alcântara Filho, 1972; Almeida et al., 2007; Fonteles Filho, 1988; Lucena et al., 2004). Landings decreased from 10,133 tons in 2009 to 9659 tons in 2011 (Boletim Estatístico da Pesca e Aquicultura, 2011).…”

Diet-morphology relationship in the stream-dwelling characid Deuterodon stigmaturus (Gomes, 1947) (Characiformes: Characidae) is partially conditioned by ontogenetic development

“…Deuterodon species are known by the atrophy of their upper lip on the sides of the head leading to exposed teeth in the maxilla and premaxilla (Lucena & Lucena, 2002). These exposed teeth are used by Deuterodon species to graze the periphyton layer of streambeds and to browse leaves and submerged plant fragments (Sabino & Castro, 1990), though other items as aquatic insects can be commonly found in their diets (Vitule et al, 2008).…”

“…Deuterodon Eigenmann is a genus of small-sized characins that inhabit stream ecosystems in southern and southeastern Brazil (Lucena & Lucena, 2002). Deuterodon species are known by the atrophy of their upper lip on the sides of the head leading to exposed teeth in the maxilla and premaxilla (Lucena & Lucena, 2002).…”

“…Furthermore, size of intestine can be constrained by body size and thus larger individuals are expected to have longer intestines, which may also influence detection of changes in dietary composition along the ontogenetic development (Kramer & Bryant, 1995a;Drewe et al, 2004;Vitule et al, 2008). Despite the several well known potential sources of variation in feeding composition of fish individuals, it is still not fully understood how small-scale interindividual variations in morphological characteristics constrain feeding behavior and dietary composition of fishes.Deuterodon Eigenmann is a genus of small-sized characins that inhabit stream ecosystems in southern and southeastern Brazil (Lucena & Lucena, 2002). Deuterodon species are known by the atrophy of their upper lip on the sides of the head leading to exposed teeth in the maxilla and premaxilla (Lucena & Lucena, 2002).…”