Littoral Communities. Macrocrustaceans

Collins, Pablo Agustín; Williner, Verónica; Giri, Federico

doi:10.1007/978-3-540-70624-3_11

Cited by 33 publications

(34 citation statements)

References 64 publications

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“…Many studies have showed that all three decapods are omnivorous organisms ingesting plants, animals and detritus (Rudnick et al . ; Dorn & Wojdak ; Collins, Williner & Giri ). These findings suggest that mitten crab, freshwater shrimp and crayfish may share a similar trophic niche and overlap in food items, particularly considering that these taxa occur in a pond ecosystem with high resource availability.…”

Section: Introductionmentioning

confidence: 99%

Food sources and trophic relationships of three decapod crustaceans: insights from gut contents and stable isotope analyses

Mao

Zeng

2015

Aquac Res

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Chinese mitten crab (Eriocheir sinensis), freshwater shrimp (Macrobrachium nipponensis) and red swamp crayfish (Procambarus clarkii) are important culture species in China and have world-wide introduced distributions. The trophic role of these three decapods has not been compared within a system although they consume plants, animals, and detritus and often co-occur in freshwater ponds. A combination of stable isotope measurements and gut content analysis was used to determine the main food sources and trophic niche of three benthic decapods, in commercial crab ponds around Lake Gucheng, China. Observation of the gut contents reflected a variety of prey items ingested by three decapods. Macrophytes made up the highest contribution to the volume of their gut contents, followed by forage fish, corn and mollusks. Stable isotope analysis supported a stronger relationship between crayfish and vegetable matter than with animal matter, while both crab and shrimp were the opposite. An isotopic mixing model indicated that about 60% of crab and shrimp production originated from animal matter, while only 40% of crayfish production was ascribed to consumption of animal matter. Although results from the mixing model corroborate the gut content findings in most cases, stable isotope results showed that three decapods obtained more energy for growth from animal matter than what would be estimated if gut analysis was used alone. Estimates of niche overlap indices indicated a high degree of dietary overlap among the three decapods examined, suggesting that shrimp and crayfish density should be controlled if considering economic benefits of pond aquaculture.

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Section: Introductionmentioning

confidence: 99%

Food sources and trophic relationships of three decapod crustaceans: insights from gut contents and stable isotope analyses

Mao

Zeng

2015

Aquac Res

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“…The present work focuses on allometric growth in Trichodactylus borellianus Nobili, 1896, which is a common species associated with the aquatic vegetation of the Paraná alluvial system in Argentina where it occurs in the Paraná and Paraguay rivers (Collins et al 2007), as well as in Brazil (Pará, Mato Grosso, Mato Grosso do Sul), Bolivia, and Paraguay (Magalhães 2003). Previous studies on Trichodactylus borellianus have analyzed the influence of temperature on growth (Renzulli and Collins 2000), but the allometric changes associated with growth and the size at which it reaches sexual maturity are still unknown.…”

Section: Introductionmentioning

confidence: 99%

Relative growth and morphological sexual maturity size of the freshwater crab Trichodactylus borellianus (Crustacea, Decapoda, Trichodactylidae) in the Middle Paraná River, Argentina

Williner¹,

Torres²,

Carvalho³

et al. 2014

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The relative growth of a number of morphological dimensions of the South American freshwater crab Trichodactylus borellianus (Trichodactylidae) were compared and related to sexual dimorphism. Crabs were collected from ponds in the Middle Paraná River in Argentina. A regression model with segmented relationship was used to test for relative growth between these measurements where breakpoints infer the body size at which crabs reach sexual maturity. In both sexes the carapace width and the length, height, and thickness of the right and left chelae were measured, as well as the male pleopod length and the female abdomen width. All of these measurements were found to show positive allometry with the exception of the male pleopod length and the left chelae, which did not show a breakpoint. In females the breakpoint for the abdomen width inferred a morphological sexual maturity at carapace width 6.9 mm. In males the break point for the pleopod length was at carapace width 6.6 mm, with that for the chelae measurements was between carapace widths 6.4 and 6.9 mm. The relative growth pattern in Trichodactylus borellianus was found to be similar to that recorded for other species of the family Trichodactylidae.

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“…These differences could reflect internal growth (e.g., gonad and muscle) or hierarchy and agonistic behaviour in the population (e.g different dimensions in cephalothorax, armament and chelae) (Williner & collins, 2000;colPo et al, 2005;giri & collins, 2004;ViAu et al, 2006;Ayres-Peres et al, 2011). Furthermore, differences in the growth of shape across several species could provide information regarding group evolution or interaction with the environment (hArtnoll, 1982;collins et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

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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Littoral Communities. Macrocrustaceans

Cited by 33 publications

References 64 publications

Food sources and trophic relationships of three decapod crustaceans: insights from gut contents and stable isotope analyses

Food sources and trophic relationships of three decapod crustaceans: insights from gut contents and stable isotope analyses

Relative growth and morphological sexual maturity size of the freshwater crab Trichodactylus borellianus (Crustacea, Decapoda, Trichodactylidae) in the Middle Paraná River, Argentina

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

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