Analysis of propagule pressure and genetic diversity in the invasibility of a freshwater apex predator: the peacock bass (genus Cichla)

Uma importante etapa na biologia da invasão é acessar variáveis biológicas que podem predizer o sucesso de invasão. O estudo da genética, evolução e interações entre invasores e espécies nativas no ambiente invadido pode prover uma oportunidade única para o estudo dos processos em genética de populações e a capacidade de uma espécie ampliar seu habitat. Nesse trabalho, nos utilizamos dados de marcadores de DNA microssatélites para testar se a variação genética é relacionada a pressão de propágulo na invasão bem sucedida do predador de topo (o ciclídeo Amazônico Cichla) nos rios do Sudeste Brasileiro. Populações invasoras de Cichla vem impactando negativamente diversas comunidades de água doce no Sudeste brasileiro deste 1960. A redução da variação genética foi observada em todas populações invasoras, tanto para Cichla kelberi (CK) como Cichla piquiti (CP). Por exemplo, a heterozigose foi menor no ambiente invadido quando comparada com as populações nativas da bacia Amazônica (CP HE = 0.179/0.44; CK HE = 0.258/0.536 respectivamente). Assim, apesar do sucesso da invasão de Cichla no sudoeste do Brasil, baixa diversidade genética foi observada nas populações introduzidas. Nós sugerimos que uma combinação de fatores, como as estratégias reprodutivas de Cichla, o efeito de "armadilha evolutiva" e a hipótese de resistências biótica superam o efeito que a diversidade genética depauperada exerce, sendo aspectos-chave na invasão desse predador de topo de cadeia.

Seawater carbonate chemistry and biological parameters during experiments with white sea bass Atractoscion nobilis, 2009

A large fraction of the carbon dioxide added to the atmosphere by human activity enters the sea, causing ocean acidification. We show that otoliths (aragonite ear bones) of young fish grown under high CO2 (low pH) conditions are larger than normal, contrary to expectation. We hypothesize that CO2 moves freely through the epithelium around the otoliths in young fish, accelerating otolith growth while the local pH is controlled. This is the converse of the effect commonly reported for structural biominerals.

Combined impacts of elevated CO2 and anthropogenic noise on European sea bass (Dicentrarchus labrax)

Ocean acidification (OA) and anthropogenic noise are both known to cause stress and induce physiological and behavioural changes in fish, with consequences for fitness. OA is also predicted to reduce the ocean's capacity to absorb low-frequency sounds produced by human activity. Consequently, anthropogenic noise could propagate further under an increasingly acidic ocean. For the first time, this study investigated the independent and combined impacts of elevated carbon dioxide (CO2) and anthropogenic noise on the behaviour of a marine fish, the European sea bass (Dicentrarchus labrax). In a fully factorial experiment crossing two CO2 levels (current day and elevated) with two noise conditions (ambient and pile driving), D. labrax were exposed to four CO2/noise treatment combinations: 400 µatm/ambient, 1000 µatm/ambient, 400 µatm/pile-driving, and 1000 µatm/pile driving. Pile-driving noise increased ventilation rate (indicating stress) compared with ambient noise conditions. Elevated CO2 did not alter the ventilation rate response to noise. Furthermore, there was no interaction effect between elevated CO2 and pile-driving noise, suggesting that OA is unlikely to influence startle or ventilatory responses of fish to anthropogenic noise. However, effective management of anthropogenic noise could reduce fish stress, which may improve resilience to future stressors.

50 lessons in singing for the middle register of the voice, and baritone or bass.

Contains 13 lessons.

Concerto in D [i.e. B minor] : for four solo violins, with accompaniment of string instruments (violas, cello and bass) and piano (cembalo) [op. 3, no. 10] /

Mode of access: Internet.

Edinburgh and its neighbourhood, geological and historical : with the geology of the Bass Rock /

Edited by Lydia Miller.

Nonet, F major, for violin, viola, violoncello, double-bass, flute, oboe, clarinet, horn and bassoon, op. 31. [music] /

"Edition Eulenburg no. 97".

Pike and perch; with notes on record pike and a chapter on the black bass, Murray cod and other sporting members of the perch family.

Mode of access: Internet.

Fly-fishing and fly-making, for trout, bass, salmon, etc. ... with plates of the actual material for making flies of forty-eight varieties ...

Mode of access: Internet.

Songs from the operas for baritone and bass. [music] /

Mode of access: Internet.

Musica sacra : or Springfield and Utica collections united: consisting of psalm and hymn tunes, anthems and chants; arranged for two, three or four voices, with a figured bass for the organ or piano forte.

Combines the "Springfield collection", edited by Warriner (Springfield, 1813) and "Musica sacra", published for the Oneida musical society (Utica, 1816)

Nonsense songs : (the songs that came out wrong) from Alice in Wonderland : a song-cycle for soprano, contralto, tenor and bass /

Advertisements on p. [1]-[2] at end.

Breton folk-songs : set to music (for soprano, contralto, tenor and bass) /

English words also printed as text.