Navegando por Assunto "Espécie exótica"

Agora exibindo 1 - 2 de 2

Distribuição dos copépodes planctônicos não nativos nos estuários de Pernambuco: uma revisão bibliográfica
(2025-08-08) Esteves, Maxuel Barreto; Melo Júnior, Mauro de; http://lattes.cnpq.br/6735233221650148; http://lattes.cnpq.br/9079607690184824
Espécies introduzidas, não nativas, apresentam ocorrência em ambientes naturais de forma acidental, intencional ou não intencional por ação antrópica, trazendo consequências danosas para o ambiente nativo e seu ecossistema. Como exemplo de espécies não nativas ou invasoras que ocuparam espaço ambiental brasileiro, temos as espécies do clado Copepoda, a exemplo do Pseudodiaptomus trihamatus, introduzida acidentalmente junto com um lote do camarão Penaeus monodon, trazida das Filipinas no final da década de 1970. Foi constatada pela primeira vez no Brasil em um viveiro de camarão no Rio Grande do Norte. Por ocasião da despesca, o copépode foi liberado para as águas costeiras. Já a espécie Temora turbinata, teve seu primeiro registro no Brasil no estuário do Rio Vaza-Barris, em Sergipe, na década de 1990. Pode ter chegado ao Brasil via água de lastro. Atualmente, domina várias áreas costeiras e estuarinas do Brasil. Neste sentido, O objetivo deste trabalho foi descrever a distribuição de ambas as espécies no litoral de Pernambuco, procurando detalhar a amplitude da densidade média e frequência de ocorrência das espécies nos ecossistemas nos quais ocorre.
Uso de recursos tróficos por Drosophila nasuta (Lamb, 1914) na Floresta Atlântica de Pernambuco
(2022-05-27) Ferreira, Ludmila Duda Vicente; Montes, Martín Alejandro; http://lattes.cnpq.br/0349635170206363; http://lattes.cnpq.br/0013823200695197
The family Drosophilidae, represented by vinegar flies, is characterized by insects that play a fundamental role in the saprophytic chain, especially in fruits. In recent decades the number of invasive species of this family has been increasing in Brazil, with Drosophila nasuta being one of the most recent cases of successful invasion. Although there is research on its abundance and distribution in the various Brazilian biomes, aspects of its trophic ecology and competitive ability in larval development are not yet known. The present study evaluated the use of trophic resources by D. nasuta for larval development in the Atlantic Forest, domain of Pernambuco. Native fruits of cajá, oiti, acerola, pitanga, pitomba, and exotic fruits of mango, almond, blackberry, jackfruit, jambo, dendê, sapoti, guava, and trapiá were investigated. The fruits were collected on the ground, distributed in jars and sealed until the adult drosophilids hatched. The drosophilids were identified and their abundance was recorded, as well as the hatching rate of larvae per fruit. Shannon-Wiener indices were calculated to attest to trophic amplitude, Pianka's index for niche overlap and Pielou's equitability to attest to the preference of D. nasuta for the sampled fruits. A total of 2,874 drosophilids were identified, with 97.32% belonging to exotic species. Drosophila nasuta was the seventh most abundant species, hatching in four native and one exotic fruit, and also being most present in jambo. The niche amplitude of D. nasuta was H' = 1.20. D. nasuta showed high niche overlap with the exotic species D. ananassae, D. kikkawai and D. malerkotliana. Drosophila nasuta showed the greatest uniformity in resource use among the exotics. It showed a generalist character, hatching mainly from native fruits and in a shorter time than the native drosophilid species. With these data, it can be seen that the preference of D. nasuta for native fruits may indicate a danger to Neotropical drosophilid communities in the Atlantic Forest. That said, the information obtained in this study is fundamental to understand part of the dynamics of the invasion and success of this species in the Atlantic Forest.