摘要:

A five-year mark-recapture study of small mammals was conducted with sampling every two months in a rural area of Sumidouro, State of Rio de Janeiro, Brazil, from June 1991 to July 1996. Population sizes were estimated through MNKA estimator, survivorship and recruitment rates through Jolly-Seber estimator. Nectomys squamipes and Didelphis aurita were the most abundant species, followed by Akodon cursor, Philander frenata and Oligoryzomys nigripes. Marsupials reproduced from July/August to March, with the highest population sizes and recruitment rates in the end of the rainy periods and beginning of the dry period. Rodents were able to reproduce throughout the year. N. squamipes' population size was correlated with survivorship; peaks and the bulk of reproduction occurred during and after the rainy periods. A. cursor's population size increased in dry periods. These species displayed seasonal patterns of population dynamics related to reproduction, with some variations among years chiefly for the rodents.

ISSN:0165-0521    

DOI:10.1076/0165-0521(200004)35:1;1-M;FT001

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Digeneans of sympatric Bufo marinus, B. valliceps, Hyla picta, H. ebraccata, Smilisca baudini, Rana berlandieri, and R. vaillanti from Los Tuxtlas, Veracruz, Mexico, are reported. A total of 7 adult trematode species and 3 unidentified metacercariae was found in the different host species examined: Gorgoderina attenuata, G. parvicava, Cephalogonimus americanus, Haematoloechus medioplexus, Glypthelmins californiensis, Mesocoelium monas and Langeronia macrocirrus. Prevalence, mean intensity and abundance of the trematodes in each host species are given.

ISSN:0165-0521    

DOI:10.1076/0165-0521(200004)35:1;1-M;FT010

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Selectivity in the consumption of plant matter from the natural habitat by the tropidurid lizard Liolaemus lutzae, endemic to the beach habitats of restingas of southeastern Brazil, and the differences in the qualitative properties of the plants consumed were studied in the Barra de MaricÝ restinga, Rio de Janeiro State. The diets of 180 lizards were analysed and the plant species present in the stomachs and their frequencies were recorded. Only four of the 19 species which occur on the beach (Phylloxerus portulacoides, Althernantera maritima, Ipomoea littoralis and I. pes-caprae) were consumed by the lizard and their frequencies in the stomachs differed from that of occurrence. Analysis of the composition of the leaves of the 13 most abundant plant species indicated that the plants consumed by the lizards had the highest contents of water, total nitrogen, total sugar and the lowest amount of gross fibres. Thus, it appears that L. lutzae is not a generalist herbivore, but feeds selectively on those plants in its environment that are most easily digested and assimilated. A seletividade no consumo de algumas entre as espécies vegetais ocorrentes no habitat de praia pelo lagarto tropidur¡deo Liolaemus lutzae e, as diferenças nas propriedades qualitativas presentes nas plantas consumidas em relação às demais plantas mais abundantes do habitat foram estudada na restinga da Barra de Maricá, Sudeste do Brasil. A dieta de 180 lagartos foi analisada tendo sido anotadas as espécies de plantas presentes no estômago e suas respectivas frequências. Apenas quatro entre as 19 espécies registradas na praia (Phylloxerus portulacoides, Althernantera maritima, Ipomoea littoralis and I. pes-caprae) foram consumidas por L. lutzae. As frequências destas na dieta do lagarto diferiram da frequência com que as plantas ocorrem no habitat. A análise da composição das folhas de 13 entre as espécies de plantas mais frequentes indicou que as plantas consumidas pelo lagarto possuem as mais elevadas proporçôes de água, nitrogênio total, açúcar total e a menor proporção de fibras. Aparentemente L. lutzae não é um herbivoro generalista mas seleciona no seu ambiente as plantas as quais são mais facilmente digeridas e assimiladas.

ISSN:0165-0521    

DOI:10.1076/0165-0521(200004)35:1;1-M;FT014

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Sternopygus castroi n. sp. is described as a new species of sternopygid Neotropical freshwater fish from the Rio Cuieiras, tributary of Rio Negro, Amazonas State, Brazil. It differs from the other species of the genus by a combination of characters. Three new synapomorphies for Sternopygus are reported. Only Sternopygus species present a membranous integumental subopercular fold originating postero-ventrally in the opercular region, running anteriorly to the isthmus region. In Sternopygus, the membranous opercular opening is wide and S-shaped (wide but fleshy in Gymnotus). In Sternopygus there is also a medial cephalic fleshy fold at the ventral margin of the opercular membrane, directed forward and ventrally to the isthmus, surrounding the anal pore anteriorly, just behind the subopercular flap.

ISSN:0165-0521    

DOI:10.1076/0165-0521(200004)35:1;1-M;FT019

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Trichomycterus barbouri (Eigenmann, 1911) is redescribed based on adult and juvenile specimens, and is distinguished from all congeners by external and osteological characters. The species previously known only from the type locality Beni river in Bolivia, is recorded here the first time for Argentina, from localities in the provinces of Tucumán, Catamarca, Córdoba and Salta. T. barbouri is compared with some Argentinian congeners.

ISSN:0165-0521    

DOI:10.1076/0165-0521(200004)35:1;1-M;FT027

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Stenophylla lobivertex, a new species of Stenophyllinae from Ecuador and Peru, where this genus has never been found before, is described. This new species differs from Stenophylla cornigera Westwood, the only species known for this genus, by the remarkable size of the median process of the vertex and by the shape of the male genitalia. The systematic position and some biogeographical remarks about the genus are made.

ISSN:0165-0521    

DOI:10.1076/0165-0521(200004)35:1;1-M;FT034

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

A historical review, diagnosis and description of the tribe Clivinematini and key to the genera are presented. Except the Holarctic Bothynotus pilosus, all known species of this tribe occur only in the New World.

ISSN:0165-0521    

DOI:10.1076/0165-0521(200004)35:1;1-M;FT038

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Schendylurus (Schendylotyn) integer Chamberlin, 1926, originally described as a member of the Schendylidae, is transferred here to the Ballophilidae as Taeniolinum integer n. comb. and redescribed after the type specimen. Taeniolinum setosum guadeloupensis Demange and Pereira, 1985 is elevated to specific rank.

ISSN:0165-0521    

DOI:10.1076/0165-0521(200004)35:1;1-M;FT044

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Ciliated protozoa from the giant rosettes of Espeletia trees (Compositae) and Espeletia soils were studied in four samples each from the Andean PÝramo in Venezuela and Ecuador. Collections were analysed with the non-flooded Petri dish method, which reactivates the ciliates' resting cysts from air-dried samples. Species were identified by live observation and silver impregnation. Although most samples, especially those from soil, contained many testate amoebae, only 18 ciliate species could be found, indicating that the non-flooded Petri dish method was rather ineffective. Probably, ciliates from this region do not make "strong " (drought resistant) resting cysts because of the humidity of the habitats. Most of the ciliate species recorded are common in litter and soil world-wide. However, two of them are new: Sikorops espeletiae nov. spec. and Fragmocirrus espeletiae nov. gen., nov. spec. Both species are described in detail, including ontogenesis of F. espeletiae. Two other as yet insufficiently known species are redescribed: Arcuospathidium muscorum (Dragesco & Dragesco-Kern‚is, 1979) and Gonostomum affine (Stein, 1859).

ISSN:0165-0521    

DOI:10.1076/0165-0521(200004)35:1;1-M;FT052

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor