Crecimiento del camaron excavador Parastacus pugnax (Poeppig, 1835) determinado mediante tecnica de marcaje

Ibarra, Mauricio; Arana, Patricio M.

doi:10.3856/vol39-issue2-fulltext-18

Cited by 11 publications

(7 citation statements)

References 13 publications

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“…Regarding the growth rates found for males and females, there was similarity and consistency with observations of other crustaceans (e.g., crab A. leptodactyla; prawn Macrobrachium borellii Nobili, 1896 and crayfish Parastacus pugnax Poepping, 1835) (collins, 1996;noro & bucKuP, 2003;ibArrA & ArAnA, 2011). However, the growth rate for females was slightly higher in other species, such as A. paulensis (cohen et al, 2011).…”

Section: Discussionsupporting

confidence: 81%

Shape and size variations of Aegla uruguayana (Anomura, Aeglidae) under laboratory conditions: A geometric morphometric approach to the growth

Diawol

Giri

Collins

2015

Iheringia, Sér. Zool.

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ABSTRACT.Crustacean growth studies typically use modal analysis rather than focusing on the growth of individuals. In the present work, we use geometric morphometrics to determine how organism shape and size varies during the life of the freshwater crab, Aegla uruguayana Schmitt, 1942. A total of 66 individuals from diverse life cycle stages were examined daily and each exuvia was recorded. Digital images of the dorsal region of the cephalothorax were obtained for each exuvia and were subsequently used to record landmark configurations. Moult increment and intermoult period were estimated for each crab. Differences in shape between crabs of different sizes (allometry) and sexes (sexual dimorphism; SD) were observed. Allometry was registered among specimens; however, SD was not statistically significant between crabs of a given size. The intermoult period increased as size increased, but the moult frequency was similar between the sexes. Regarding ontogeny, juveniles had short and blunt rostrum, robust forehead region, and narrow cephalothorax. Unlike juveniles crabs, adults presented a well-defined anterior and posterior cephalothorax region. The rostrum was long and stylised and the forehead narrow. Geometric morphometric methods were highly effective for the analysis of aeglid-individual-growth and avoided excessive handling of individuals through exuvia analysis. KEYWORDS.Crustacea, cephalothorax, ontogeny, intermoult, morphometrics. RESUMEN. Variaciones de forma y tamaño deAegla uruguayana (Anomura, Aeglidae): Una aproximación desde la morfometría geométrica al crecimiento. Los estudios de crecimiento en crustáceos típicamente utilizan análisis modal en lugar de focalizarse en el crecimiento individual de los organismos. En el presente trabajo, utilizamos morfometría geométrica para determinar cómo varia la forma y el tamaño a lo largo de la vida del cangrejo de agua dulce, Aegla uruguayana Schmitt, 1942. Un total de 66 individuos, en diferentes etapas del ciclo de vida, se examinaron diariamente, registrándose la presencia de exuvias. Imágenes digitales de cada muda fueron obtenidas de la región dorsal del cefalotórax y se utilizaron para registrar las configuraciones de landmarks. El incremento por muda y el período de intermuda se estimaron para cada cangrejo. Diferencias de forma entre tamaños (alometría) y sexos (dimorfismo sexual; SD) se observaron. Se registró la presencia de alometría entre los especímenes; sin embargo, el SD no fue estadísticamente significativo respecto del tamaño. El período intermuda aumentó de manera directamente proporcional al tamaño, pero la frecuencia de muda fue similar entre los sexos. Durante la ontogenia, los juveniles presentaron rostro corto y romo, frente robusta, y ancho del cefalotórax estrecho. Los adultos presentaron la región anterior y posterior del cefalotórax bien definido en relación con los juveniles. El rostro fue largo y estilizado y la frente estrecha. Los métodos de morfometría geométrica fueron muy efectivos para el análisis del crecimiento individual e...

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Section: Discussionsupporting

confidence: 81%

Shape and size variations of Aegla uruguayana (Anomura, Aeglidae) under laboratory conditions: A geometric morphometric approach to the growth

Diawol

Giri

Collins

2015

Iheringia, Sér. Zool.

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“…Nonetheless, certain differences were noticed between the growth rates (K) estimated in both studies, which caused discrepancies in the time required by these species to reach the salable size of 30 mm CL that has been established for S. spinifrons (Rudolph et al, 2010). According to Ibarra & Arana (2011), this would be reached in 3.1 years and according to the present study, in 1.9 years. This discrepancy could be attributed to a possible negative effect in growth when using tags adhered to the body of the organisms or rather to an overestimate of the age when using the modal progression method, as noted by different authors (e.g.…”

Section: Discussioncontrasting

confidence: 63%

Biological parameters of the burrowing crayfish, Parastacus pugnax (Poeppig, 1835), in Tiuquilemu, Bio Bio Region, Chile

Ibarra¹,

Arana²

2012

lajar

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ABSTRACT. In order to determine the biological parameters of the burrowing crayfish (Parastacus pugnax), we fenced in 900 m 2 of a humid, low-lying sector in Tiuquilemu, Bío-Bío Region, Chile. Monthly samples were taken from August 2007 to August 2008, and 3,512 specimens were caught. Records were made of their carapace length (CL), total weight (TW), sex, and number of eggs (for females). The monthly size-structures showed few juveniles between 20 and 30 mm CL in nearly all months. P. pugnax was found to carry eggs from mid-spring through late autumn; size at first maturity for females was 38.1 mm CL; and fecundity varied between three and 45 eggs per female. In terms of the global sexual proportion, males were predominant in 11 of the 12 months, although the ratio was as expected (1:1). We estimated the parameters of the growth curve using modal progression analysis, obtaining CL ∞ , K, and t 0 values of 55.3 mm, 0.23 mm year -1 , and -0.58 years, respectively. The length-weight relationship was calculated separately for males and females, and no significant differences were found between sexes. The common parameters defining the potential function of a = 0.00052 and b = 2.98 (P < 0.05) indicated isometric increments in weight. . A un total de 3.512 especímenes se les registró la longitud cefalotorácica (CL), peso total (TW), sexo y en hembras se determinó el número total de huevos. Se construyeron las estructuras de longitudes mensuales con escasa representación de juveniles entre 20 y 30 mm de CL, en casi la mayoría de los meses. Se determinó que el período de incubación en P. pugnax se extiende entre mediados de primavera y finales de otoño, la longitud de primera madurez en las hembras se calculó en 38,1 mm de CL y la fecundidad varió entre tres y 45 huevos por hembra. En cuanto a la proporción sexual global, hubo predominio de machos en 11 de los 12 meses; no obstante, estas no difieren de la razón esperada 1:1. Se estimaron los parámetros de la curva de crecimiento mediante el método de análisis de progresión modal, obteniéndose valores de CL ∞ , K y t 0 , correspondientes a 55,3 mm, 0,23 mm·año -1 y -0,58 años, respectivamente. La relación longitud-peso se calculó en machos y hembras separadamente, no existiendo diferencias significativas entre sexos, con parámetros comunes que definen la función potencial de a = 0,00052 y b = 2,98 (P < 0,05), estableciéndose que el crecimiento en peso es de tipo isométrico.

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“…In Chile, impacts include siltation caused by deforestation to enable livestock grazing and crop production (Buckup, , ). There are also localized threats such as harvesting for human consumption, using crayfishes as bait for salmon fishing, management of river‐bank vegetation and aquatic macrophytes, physical alterations to the river channel by the extraction of groundwater (Rudolph, ; Buckup, , , ; Ibarra and Arana, ) and the removal of Sphagnum moss, which is the specific habitat of two species ( V . araucanius and V .…”

Section: State Of Knowledgementioning

confidence: 98%

“…In Chile, impacts include siltation caused by deforestation to enable livestock grazing and crop production (Buckup, 2010a, b). There are also localized threats such as harvesting for human consumption, using crayfishes as bait for salmon fishing, management of river-bank vegetation and aquatic macrophytes, physical alterations to the river channel by the extraction of groundwater (Rudolph, 2002b;Buckup, 2010b, i, j;Ibarra and Arana, 2011) and the removal of Sphagnum moss, which is the specific habitat of two species (V. araucanius and V. retamali), for commercial purposes (Buckup, 2010j, k). Alien species have been identified by IUCN as major threats causing biodiversity loss (IUCN Standards and Petitions Subcommittee, 2013) and have documented impact on endemic crayfishes (Lodge et al, 2012;Sousa et al, 2013).…”

Section: Main Threatsmentioning

confidence: 99%

The native South American crayfishes (Crustacea, Parastacidae): state of knowledge and conservation status

Almerão

Rudolph

Souty‐Grosset

et al. 2014

Aquatic Conservation

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South America is considered a world biodiversity hotspot, especially for freshwater ecosystems where there is significant biodiversity and endemism across different taxonomic groups. Native South American crayfishes are characterized by small range distributions, high levels of endemism and specific habitat requirements. Although this group may be considered one of the most threatened among South American freshwater crustaceans, IUCN Red List assessments for most of these species are ‘data deficient’. IUCN assessments are technical evaluations of species risk of extinction based on biological indicators of population features, thereby providing a ‘conservation status’ for each species based on common and international standards. Attempts to assess the conservation status of native South American crayfishes have been limited mainly owing to a lack of fundamental data and also misinterpretations of present information. Thus, a revision of the state of knowledge of native South American crayfishes (taxonomy, phylogeny and distribution, genetics, ecology and threats) was carried out coupled with IUCN assessments of conservation status. Globally, the lack of information on the biology of these species is still the major obstacle to making reliable conservation status assessments. For this reason, the Data Deficient (DD) category is still appropriate for many species. However, based on the Extent of Occurrence (EOO) and severely fragmented populations, number of locations and decline in area, extent or quality of habitat, it is recommended that some species (especially Virilastacus spp.) should be moved to threatened categories (VU, EN or CR). The data suggest that others are appropriately in the Near Threatened (NT) category, because they almost reach the thresholds for threatened categories. The assessment of conservation status is essential to support future conservation actions, especially for species allocated to threatened categories. This study has identified new species under threat and also areas for future study to provide relevant data for conservation assessment for ‘data deficient’ species. Copyright © 2014 John Wiley & Sons, Ltd.

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Crecimiento del camaron excavador Parastacus pugnax (Poeppig, 1835) determinado mediante tecnica de marcaje

Cited by 11 publications

References 13 publications

Shape and size variations of Aegla uruguayana (Anomura, Aeglidae) under laboratory conditions: A geometric morphometric approach to the growth

Shape and size variations of Aegla uruguayana (Anomura, Aeglidae) under laboratory conditions: A geometric morphometric approach to the growth

Biological parameters of the burrowing crayfish, Parastacus pugnax (Poeppig, 1835), in Tiuquilemu, Bio Bio Region, Chile

The native South American crayfishes (Crustacea, Parastacidae): state of knowledge and conservation status

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