CERBONCINI, R.A.S.; JUNIOR, C.M.M.; TIEPOLO, L.M.; PASSOS, F.C. 2014. New records of the red-rumped mouse Juliomys pictipes (Osgood, 1933) (Rodentia: Sigmodontinae) in coastal Atlantic Forest of Paraná, southern Brazil. Biotemas 27(1):159-164.
Abstract. Juliomys pictipes is a Sigmodontinae rodent endemic to the Atlantic Forest. Herein, we report the first records of the species on the coast of the state of Paraná, filling a gap in the species’ distribution. Records at low altitudes in the eastern part of the Serra do Mar conirm that the coastal mountains are not a barrier to the species’ distribution.
sábado, 31 de maio de 2014
sexta-feira, 30 de maio de 2014
Journals: Biotemas
Biotemas
-
Abreviatura: Biotemas.
- Home Page: https://periodicos.ufsc.br/index.php/biotemas
-
Qualis CAPES: B3 (Biodiversidade), C (Ciências Biológicas
II e III).
- Taxa
de Publicação: Sim.
-
Idiomas: Português, Espanhol, Inglês.
-
Disponibilidade: Acesso livre a todos os artigos no site.
Artigos mais antigos podem não estar disponíveis ainda.
-
Submissão: Online, através do Portal de Periódicos UFSC, com acesso
na home page (link direto: http://periodicos.ufsc.br/index.php/biotemas/information/authors).
O periódico Biotemas é uma publicação eletrônica, tendo sido também impressa
até o ano de 2007. Atualmente é uma revista trimestral, que visa publicar
manuscritos nas áreas de ciências biológicas, ciências agrárias, ciências da
saúde, informática aplicada a estas ciências e ensino de biologia. Têm como
público-alvo os pesquisadores, estudantes de pós-graduação e graduação das
áreas citadas.
sábado, 24 de maio de 2014
External features of the dusk dolphin Lagenorhynchus obscurus (Gray, 1828) from Peruvian waters
WAEREBEEK, K.V. 1993. External features of the dusk dolphin Lagenorhynchus obscurus (Gray, 1828) from Peruvian waters. Estudos Oceanológicos 12:37-53.
Abstract. Individual, sexual and developmental variation is quantified in the external morphology and colouration of the dusky dolphin Lagenorhynchus obscurus from Peruvian coastal waters. No significant difference in body length between sexes is found (p = 0.09) and, generally, little sexual dimorphism is present. However, males have a more anteriorly positioned genital slit and anus and their dorsal fin is more curved, has a broader base and a greater surface area than females Although the dorsal fin apparently serves as a secondary sexual character, the use of it for sexing free-ranging dusky dolphins is discouraged because of high overlap in values. Relative growth in 25 body measurements is characterized for both sexes by multiplicative regression equations. The colouration pattern of the dorsal fin, flank patch, thoracic field, flipper stripe and possibly (X², p = 0.08) the eye patch, are independent of maturity status. Flipper blaze and lower lip patch are less pigmented in juveniles than in adults No sexual dimorphism is found in the colour pattern The existence of a discrete "Fitzroy" colour form can not be confirmed from available data. Various cases of anomalous, piebald pigmentation are described, probably equivalent to so-called partial albinism. Adult dusky dolphins from both SW Africa and New Zealand are 8-10 cm shorter than Peruvian specimens, supporting conclusions of separate populations from a recent skull variability study.
Abstract. Individual, sexual and developmental variation is quantified in the external morphology and colouration of the dusky dolphin Lagenorhynchus obscurus from Peruvian coastal waters. No significant difference in body length between sexes is found (p = 0.09) and, generally, little sexual dimorphism is present. However, males have a more anteriorly positioned genital slit and anus and their dorsal fin is more curved, has a broader base and a greater surface area than females Although the dorsal fin apparently serves as a secondary sexual character, the use of it for sexing free-ranging dusky dolphins is discouraged because of high overlap in values. Relative growth in 25 body measurements is characterized for both sexes by multiplicative regression equations. The colouration pattern of the dorsal fin, flank patch, thoracic field, flipper stripe and possibly (X², p = 0.08) the eye patch, are independent of maturity status. Flipper blaze and lower lip patch are less pigmented in juveniles than in adults No sexual dimorphism is found in the colour pattern The existence of a discrete "Fitzroy" colour form can not be confirmed from available data. Various cases of anomalous, piebald pigmentation are described, probably equivalent to so-called partial albinism. Adult dusky dolphins from both SW Africa and New Zealand are 8-10 cm shorter than Peruvian specimens, supporting conclusions of separate populations from a recent skull variability study.
sábado, 17 de maio de 2014
Ecomorphology of orbit orientation and the adaptative significance of binocular vision in primates and other mammals
HEESY, C.P. 2008. Ecomorphology of orbit orientation and the adaptative significance of binocular vision in primates and other mammals. Brain, Behaviou and Evolution 71:54-67. doi: 10.1159/000108621
Abstract. Primates are characterized by forward-facing, or convergent, orbits and associated binocular field overlap. Hypotheses explaining the adaptive significance of these traits often relate to ecological factors, such as arboreality, nocturnal visual predation, or saltatory locomotion in a complex nocturnal, arboreal environment. This study re-examines the ecological factors that are associated with high orbit convergence in mammals. Orbit orientation data were collected for 321 extant taxa from sixteen ordens of metatherian (marsupial) and eutherian mammals. These taxa were coded for activity pattern, degree of faunivory, and substrate preference. Results demonstrate that nocturnal and cathemeral mammals have significantly more convergent orbits than diurnal taxa, both within and across ordens. Faunivorous eutherians (noth nocturnal and diurnal) have higher mean orbit convergence that opportunistically foraging or non-faunivorous taxa. However, substrate preference is not associated with higher orbit convergence and, by extension, greater binocular visual field overlap. These results are consistent with the hypothesis that mammalian predators evolved higher orbit convergence, binocular vision, and stereopsis to counter camouflage in prey inhabiting a nocturnal environment. Strepsirhine primates have a range of orbit convergence values similar to nocturnal or cathemeral prodatory non-primates mammals. These data are entirely consistent with the nocturnal visual predation hypothesis of primate origins.
Abstract. Primates are characterized by forward-facing, or convergent, orbits and associated binocular field overlap. Hypotheses explaining the adaptive significance of these traits often relate to ecological factors, such as arboreality, nocturnal visual predation, or saltatory locomotion in a complex nocturnal, arboreal environment. This study re-examines the ecological factors that are associated with high orbit convergence in mammals. Orbit orientation data were collected for 321 extant taxa from sixteen ordens of metatherian (marsupial) and eutherian mammals. These taxa were coded for activity pattern, degree of faunivory, and substrate preference. Results demonstrate that nocturnal and cathemeral mammals have significantly more convergent orbits than diurnal taxa, both within and across ordens. Faunivorous eutherians (noth nocturnal and diurnal) have higher mean orbit convergence that opportunistically foraging or non-faunivorous taxa. However, substrate preference is not associated with higher orbit convergence and, by extension, greater binocular visual field overlap. These results are consistent with the hypothesis that mammalian predators evolved higher orbit convergence, binocular vision, and stereopsis to counter camouflage in prey inhabiting a nocturnal environment. Strepsirhine primates have a range of orbit convergence values similar to nocturnal or cathemeral prodatory non-primates mammals. These data are entirely consistent with the nocturnal visual predation hypothesis of primate origins.
quinta-feira, 15 de maio de 2014
Journals: Iheringia, Série Zoologia
Iheringia,
Série Zoologia
-
Abreviatura: Iheringia Sér. Zool.
-
Qualis CAPES: B2 (Biodiversidade), B5 (Ciências Biológicas
I, II e III).
- Taxa
de Publicação: Não há.
-
Idiomas: Português, Espanhol, Inglês.
-
Disponibilidade: Restrito. Alguns artigos são divulgados no
site e de acesso livre, mas a maioria é de acesso restrito.
- Submissão:
Online, pelo Portal Scielo, com acesso na home page.
O periódico Iheringia, Série Zoologia, editado pelo Museu de Ciências Naturais
da Fundação Zoobotânica do Rio Grande do Sul, publica pesquisas originais em
Zoologia, com ênfase em taxonomia e sistemática, morfologia, história natural e
ecologia de comunidades e populações de espécies da fauna Neotropical
contemporânea. Notas científicas não são aceitas para publicação. Listas de
espécies normalmente não serão aceitas sem uma abordagem taxonômica, ou que não
sejam o resultado de um estudo em ecologia ou história natural de comunidades,
assim como chaves de identificação de grupos de táxons definidos por limites
políticos. Autores que desejam questionar a respeito do escopo do periódico ou
a adequação de um tópico em particular são encorajadas a contatar o Conselho
Editorial antes da submissão. Em adição, artigos com foco principal em
agronomia, veterinária, zootecnia ou outra área envolvendo zoologia aplicada
não serão aceitos. Manuscritos que não obedeçam as diretrizes do periódico
serão devolvidos aos autores antes de serem avaliados pelo Conselho Editorial e
os revisores.
sábado, 10 de maio de 2014
Late Pleistocene (Rancholabrean) Glyptodont and Pampathere (Xenarthra, Cingulata) from Sonora, Mexico
MEAD, J.I.; SWIFT, S.L.; WHITE, R.S. MCDONALD, H.G.; BAEZ, A. 2007. Late Pleistocene (Rancholabrean) Glyptodont and Pampathere (Xenarthra, Cingulata) from Sonora, Mexico. Revista Mexicana de Ciências Geológicas 24(3):439-449.
Abstract. The fossil-rich deposits of Térapa (east-central Sonora) contain more than 60 zoological taxa, many with tropical affinities such as Crocodylus (crocodylian), Hydrochaeris (capybara), and many birds. The deposits also contain the dermal ossicles (osteoderms) of two extinct xenarthrans, a glyptodont (Glyptotherium cylindricum) and a pampathere (giant armadillo; Pampatherium cf. mexicanum). Glyptodont remains are also known from other less-well studied localities in Sonora. The faunas from these localities also contain the genus Bison, which indicates that the deposits are of the Rancholabrean Land Mammal Age, late Pleistocene. The presence of Pampatherium at Térapa and the presence of Glyptotherium at Térapa and the Río Mayo/Río Yaqui sites represent the first published accounts of these species from Sonora, and greatly extends their known geographical distribution during the Rancholabrean by about 1,100 km into northwestern Mexico.
Abstract. The fossil-rich deposits of Térapa (east-central Sonora) contain more than 60 zoological taxa, many with tropical affinities such as Crocodylus (crocodylian), Hydrochaeris (capybara), and many birds. The deposits also contain the dermal ossicles (osteoderms) of two extinct xenarthrans, a glyptodont (Glyptotherium cylindricum) and a pampathere (giant armadillo; Pampatherium cf. mexicanum). Glyptodont remains are also known from other less-well studied localities in Sonora. The faunas from these localities also contain the genus Bison, which indicates that the deposits are of the Rancholabrean Land Mammal Age, late Pleistocene. The presence of Pampatherium at Térapa and the presence of Glyptotherium at Térapa and the Río Mayo/Río Yaqui sites represent the first published accounts of these species from Sonora, and greatly extends their known geographical distribution during the Rancholabrean by about 1,100 km into northwestern Mexico.
sábado, 3 de maio de 2014
Interactions between Atlantic spotted (Stenella frontalis) and bottlenose (Tursiops truncatus) dolphins off Bimini, The Bahamas, 2003-2007
MELILLO, K.E.; DUDZINSKI, K.M.; CORNICK, L.A. 2009. Interactions between Atlantic spotted (Stenella frontalis) and bottlenose (Tursiops truncatus) dolphins off Bimini, The Bahamas, 2003-2007. Aquatic Mammals 35(2):281-291. DOI: 10.1578/AM.35.2.2009.281
Abstract. Interspecific interactions have been observed in a variety of social animal. Functional explanations include foraging, anti-predatory, and social advantages. These behaviours are poorly understood in marine mammals but are increasingly studied phenomena in sympatric populations. Resident Atlantic spotted dolphins (Stenella frontalis) off Bimini, The Bahamas, have been the subject of ongoing photo-identification and behavioural studies since 2001. A lesser-known population of bottlenose dolphins (Tursiops truncatus) has been observed interacting with these S. frontalis since 2003. To examine the functional significance of these interactions, interspecific behaviours were documented with underwater video using focal animal sampling. Mating or sexual play were the primary activities observed in nearly 50% of interactions, with male T. truncatus as the initiators. Therefore, the most likely functional explanation for these interactions is social. We hypothesize that male T. truncatus which lack acess to T. truncatus females because of sexual immaturity or low social status seek copulations with S. frontalis females as an alternative.
Abstract. Interspecific interactions have been observed in a variety of social animal. Functional explanations include foraging, anti-predatory, and social advantages. These behaviours are poorly understood in marine mammals but are increasingly studied phenomena in sympatric populations. Resident Atlantic spotted dolphins (Stenella frontalis) off Bimini, The Bahamas, have been the subject of ongoing photo-identification and behavioural studies since 2001. A lesser-known population of bottlenose dolphins (Tursiops truncatus) has been observed interacting with these S. frontalis since 2003. To examine the functional significance of these interactions, interspecific behaviours were documented with underwater video using focal animal sampling. Mating or sexual play were the primary activities observed in nearly 50% of interactions, with male T. truncatus as the initiators. Therefore, the most likely functional explanation for these interactions is social. We hypothesize that male T. truncatus which lack acess to T. truncatus females because of sexual immaturity or low social status seek copulations with S. frontalis females as an alternative.
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