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41.
del CG del Prado-Rosas M; Alvarez-Cadena J; Segura-Puertas L; Lamothe-Argumedo R 《Journal of plankton research》1999,21(5):1005-1008
From samples collected in the Caribbean Sea during February, March, May and
August 1991, a total of 22 508 holoplanktonic chaetognaths were caught.
During the analyses of the samples, one non-cysted specimen of didymozoid
metacercaria was found in the coelom of the chaetognath
Serratosagitta serratodentata (prevalence 0.004%).
Owing to the lack of an authentic stomach and the morphology of the
intestine, this trematode seems to belong to the
Torticaecum larval type. This is the first report of
both the chaetognath species as a host and the geographical locality for
this parasite.
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Phylogeny and biogeography of ratite birds inferred from DNA sequences of the mitochondrial ribosomal genes 总被引:7,自引:2,他引:5
The origin of the flightless ratite birds of the southern continents has
been debated for over a century. Whether dispersal or vicariance
(continental breakup) best explains their origin depends largely on their
phylogenetic relationships. No consensus has been reached on this issue
despite many morphological and molecular studies. To address this question
further we sequenced a 2.8-kb region of mitochondrial DNA containing the
ribosomal genes in representative ratites and a tinamou. Phylogenetic
analyses indicate that Struthio (Africa) is basal and Rhea (South America)
clusters with living Australasian ratites. This phylogeny agrees with
transferrin and DNA hybridization studies but not with sequence analyses of
some protein-coding genes. These results also require reevaluation of the
phylogenetic position of the extinct moas of New Zealand. We propose a new
hypothesis for the origin of ratites that combines elements of dispersal
and vicariance.
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Rosemara Fugi Norma Segatti Hahn Angelo Antonio Agostinho 《Environmental Biology of Fishes》1996,46(3):297-307
Synopsis In this study the diets of five species of bottom-feeding fishes (Prochilodus lineatus, Steindachnerina insculpta, Loricariichthys platymetopon, Trachydoras paraguayensis and Iheringichthys labrosus) were analyzed. Samples were taken in the High Paraná River basin and its floodplain from August 1987 to July 1988 and in February, August and September 1991. The results demonstrated that P. lineatus and S. insculpta were ileophagous, L. platymetopon was detritivorous and I. labrosus and T. paraguayensis were benthophagous. The feeding activity was higher during the flood period for P. lineatus and in dry season for T. paraguayensis. P. lineatus and S. insculpta fed mainly during the day, while I. labrosus and T. paraguayensis during the day and dusk, respectively. 相似文献
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Yofukuji Katia Yasuko Cardozo Ana Lúcia Paz Quirino Bárbara Angélio Aleixo Matheus Henrique Ferreira Fugi Rosemara 《Hydrobiologia》2021,848(4):913-927
Hydrobiologia - The diversity of aquatic macrophytes can offer different local conditions required to support an increased number of microhabitats, therefore resulting in diverse biotic... 相似文献