Size and shape variability in the skull of &lt;i&gt;Pontoporia blainvillei&lt;/i&gt; (Cetacea: Pontoporiidae) from the Brazilian coast

Higa, Antônio Rioyei; Hingst‐Zaher, Erika; Vivo, Mário de

doi:10.5597/lajam00018

Cited by 18 publications

(21 citation statements)

References 7 publications

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“…There is not much evidence that this may be a sexually dimorphic character. In P. blainvillei, it has been observed that the female has a larger size (reflected in the size of skull and teeth- Higa et al 2002;Ramos et al 2000b) but there are no known cases in odontocetes that have demonstrated differences in the size of the rostrum as a sexually dimorphic character. Additionally, a long or short rostrum could be interpreted to imply different feeding habits (Werth 2006), but still these inferences are difficult to delimit in living species and may be less crucial in the animal's life than has been generally thought.…”

Section: Discussionmentioning

confidence: 97%

Patterns of Skull Variation ofBrachydelphis(Cetacea, Odontoceti) from the Neogene of the Southeastern Pacific

Cozzuol¹,

Vargas²,

Suárez³

et al. 2009

J Mammal

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Section: Discussionmentioning

confidence: 97%

Patterns of Skull Variation ofBrachydelphis(Cetacea, Odontoceti) from the Neogene of the Southeastern Pacific

Cozzuol¹,

Vargas²,

Suárez³

et al. 2009

J Mammal

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“…However, it is commonly and erroneously believed that the species was described in Gervais and d'Orbigny (1844b) (e.g. Pinedo et al, 1989;Higa et al, 2002). The reason for the confusion lies in the fact that the publication date of Gervais and d'Orbigny (1844b) (27 April 1844), corresponds to the date of the session of the Société Philomatique but not to the date of its actual publication (see Mones and Philippi, 1992).…”

Section: Historical Review Of Franciscana Colourationmentioning

confidence: 99%

“…Fortunately other approaches including morphological and molecular analyses have been used successfully for determining stock units (e.g. Pinedo, 1991;Secchi et al, 1998;Higa et al, 2002;Ramos et al, 2002;Secchi et al, 2003;Lázaro et al, 2004).…”

Section: Final Considerationsmentioning

confidence: 99%

“…Previous research based on morphological (Pinedo, 1991;Higa et al, 2002;Ramos et al, 2002) and genetic data (Secchi et al, 1998;Lázaro et al, 2004) have suggested the existence of at least two clearly defined stocks of franciscana, one to the north of Santa Catarina (~29°S), Brazil and the other to the south. Furthermore, a phylogeographic analysis by Secchi et al (2003) (combining mtDNA data, morphometrics, and lifehistory parameters) provided evidence for separating the species into four management stocks: two inhabiting coastal waters of Brazil, the third occurring in Rio Grande do Sul state (southern Brazil) and Uruguay, and the fourth in coastal Argentinean waters.…”

Section: Introductionmentioning

confidence: 99%

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What is the colour of the franciscana (Pontoporia blainvillei)? a review and a proposed assessment method

Trimble¹,

Praderi²

2006

Lat. Am. J. Aquat. Mamm.

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WHAT IS THE COLOUR OF THE FRANCISCANA (PONTOPORIA BLAINVILLEI)?: A REVIEW AND A PROPOSED ASSESSMENT METHOD MICAELA TRIMBLE1,* AND RICARDO PRADERI 2 ABSTRACT: Colouration pattern is suggested as a potentially useful characteristic to identify populations of franciscana (Pontoporia blainvillei). Such information is needed for the creation of management and conservation plans for the species. The existence of geographic variation in the colour of the franciscana has been hypothesized; it is suggested that Brazilian and Uruguayan individuals are greyish, while the Argentinean are brownish. We examined individuals from Uruguay using an objective method (Villalobos and Villalobos, 1947) to determine colour patterns. We also reviewed the variation of the colour pattern of the franciscana throughout this species' distribution as noted in the published literature. In the original description of the species in 1844 and in several subsequent papers during the 19 th century, the colour pattern of the franciscana was erroneously described (e.g. as black and white). Only since the 20 th century have the colouration descriptions approximately matched the actual specimens observed. These descriptions can be typically divided into two basic classes: greyish and ochre/brown. However, within these two general colour groups there is great variation. Several descriptions provided by Brazilian, Uruguayan, and Argentinean authors agree with the above hypothesis. The great variation within the modern descriptions of the franciscana´s colour suggests that a variety of factors must be involved; therefore, we conclude that on the basis of the literature alone, it is very difficult to decide whether differences really exist in the franciscana´s colour along its distribution. According to Villalobos and Villalobos (1947), the colour pattern of Uruguayan specimens could be interpreted as 'greyish dorsally and yellowish-grey laterally'. Due to some limitations found in this technique, we propose a new method based on the RGB ("red, green, blue") system that may fulfill our expectations for an objective procedure to determine colouration patterns. This standardized method would allow for a reliable comparison of colour patterns among franciscana populations. RESUMEN:El patrón de coloración es sugerido como un carácter potencialmente útil para identificar poblaciones de franciscana (Pontoporia blainvillei). Esta información es necesaria para la creación de planes de manejo y conservación de la especie. La existencia de variación geográfica en la coloración de esta especie ha sido hipotetizada; se sugiere que los ejemplares de Brasil y Uruguay son grisáceos y los de Argentina amarronados. Se examinaron ejemplares de Uruguay mediante una técnica objetiva (Villalobos y Villalobos, 1947) para determinar patrones de coloración. También se hizo una revisión de la variación del patrón de coloración de la franciscana a lo largo de su distribución, basada en la literatura publicada. Según la descripción original de la especie en 1844, y varios trabajos ...

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“…In a review of the mammals of Santa Catarina State, Cherem et al (2004) indicated that the species occurs along the coast of the whole state. Opportunistic sightings (FLORES, 2009), studies related to biological information, such as diet , and comparative studies related to morphology (HIGA et al, 2002) and contamination TORRE et al, 2012) are reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Franciscana strandings on the north coast of Santa Catarina State and insights into birth period

et al. 2013

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Resumo Encalhes de toninhas no litoral norte de Santa Catarina e informações sobre o período de nascimento.A toninha (Pontoporia blainvillei) é o pequeno cetáceo mais ameaçado do Atlântico Sul Ocidental. A captura acidental em redes de pesca é o maior problema para esta espécie ao longo de sua distribuição. As toninhas mortas encontradas nas praias são uma importante fonte de informações. O objetivo deste trabalho foi analisar os registros de carcaças de toninhas encontradas mortas no litoral norte de Santa Catarina, incluindo a Baía da Babitonga. Entre janeiro de 2001 e novembro de 2012 foram registradas 54 carcaças de toninhas. Entre os meses de agosto e outubro foram registradas 28 carcaças (52%), sendo que o número mais elevado (oito indivíduos) foi encontrado em 2011. Levando em conta que estas informações não são decorrentes de um esforço sistematizado, não podemos considerar que esta seja uma estimativa de mortalidade. O maior animal registrado foi uma fêmea, com 142 cm de comprimento. Dentre os animais recuperados, 10 (18,5%) tinham comprimento total inferior a 80 cm, sendo considerados fetos ou filhotes. Estes registros indicam que o principal período de nascimento de toninhas em Santa Catarina é de outubro a janeiro. As informações aqui apresentadas contribuem para o conhecimento desta espécie no Estado. and November 2012, 54 franciscana carcasses were recorded, with the highest number (8 individuals) in 2011. Fifty-two percent (n=28) of the carcasses were recorded between August and October. Taking into account that this information was not obtained from a systematic effort, it was not possible to consider this as an estimation of mortality. The largest animal was a female, with a total length of 142 cm. Ten recovered animals (18.5%) were smaller than 80 cm, and were considered fetuses or calves. These records indicate that the main birthing period for franciscanas in Santa Catarina is between October and January. The findings presented here contribute to our knowledge of franciscana ecology in the state of Santa Catarina.

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Size and shape variability in the skull of <i>Pontoporia blainvillei</i> (Cetacea: Pontoporiidae) from the Brazilian coast

Cited by 18 publications

References 7 publications

Patterns of Skull Variation ofBrachydelphis(Cetacea, Odontoceti) from the Neogene of the Southeastern Pacific

Patterns of Skull Variation ofBrachydelphis(Cetacea, Odontoceti) from the Neogene of the Southeastern Pacific

What is the colour of the franciscana (Pontoporia blainvillei)? a review and a proposed assessment method

Franciscana strandings on the north coast of Santa Catarina State and insights into birth period

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