Guild structure of carnivorous intertidal fishes of the Chilean coast: implications of ontogenetic dietary shifts

Muñoz, Alejandro Anaya; Ojeda, F. Patricio

doi:10.1007/s004420050481

Cited by 102 publications

(106 citation statements)

References 49 publications

(60 reference statements)

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“…Habitat shifts during different life history stages are known to be commonplace among fish (Muñoz and Ojeda, 1998), including freshwater (e.g. Schleuter and Eckmann, 2008), estuarine (e.g.…”

Section: Introductionmentioning

confidence: 99%

Tracking variations in wetland use by breeding flamingos using stable isotope signatures of feather and blood

Yohannes¹,

Arnaud

Béchet

2014

Estuarine, Coastal and Shelf Science

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Keywords:stable isotopes habitat shift index of isotopic shift France Camargue Bayesian mixing models saltpans a b s t r a c t This study tracks temporal variations in the habitat use of breeding adult greater flamingos (Phoeni copterus roseus) in the Camargue (southern France) using simultaneous sampling of d 15 N, d 13 C and d 34 S from feather and blood of chicks at fledging. Camargue flamingos forage in a heterogeneous complex of saltpans, permanent and temporary brackish lagoons, freshwater and euryhaline marshes to provision their chicks over a two month period. Using Bayesian mixing models with diet and tissue specific discrimination factors and invertebrates collected from 23 locations, we investigated whether blood and feather isotopes indicated temporal variations in habitat use relative to salinity and hydroperiod. We also tested whether fledgling body condition could be explained by the isotopic signatures of their tis sues. While d 13 C and d 15 N values did not differ significantly between blood and feather, marked differ ences were apparent in the d 34 S values obtained from these tissues. Saltpans (38%) and freshwater marshes (33%) appeared to be the main habitats visited by adult birds in the early phase of parental care with use of saline wetlands increasing later in the season (54%). This habitat shift may be related to the peak of resources in saltpans and the drying up of freshwater and brackish marshes by mid summer. Habitat shift (as expressed in individual shifts in isotope values between feather and blood) was not correlated with offspring age, and differed between individuals. A negative relationship was observed between offspring body condition and feather d 15 N, indicating that chicks fed from temporary flooded marshes fare better than those provisioned from permanent marshes. Foraging strategies of greater flamingos during parental care were heterogeneous, possibly tracking changes in resource availability as the season progressed and reflecting differences in the competitive ability of parent birds. Given that the Camargue saltpans face closure and the region's temporary wetlands remain threatened, our results emphasize the critical importance of conserving these two key habitats for greater flamingos. Dual tissue, triple stable isotope analysis provides a useful and sensitive means of tracking localized environmental change in this threatened system.

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Section: Introductionmentioning

confidence: 99%

Tracking variations in wetland use by breeding flamingos using stable isotope signatures of feather and blood

Yohannes¹,

Arnaud

Béchet

2014

Estuarine, Coastal and Shelf Science

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“…Indeed, ecological differences (for example, diet, habitat use) among stages within species can rival or even exceed differences between species [18][19][20] . Given such differences among stages, the demographic structure of populations should strongly determine the functional roles of species, thereby influencing ecosystem functioning 21 .…”

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confidence: 99%

Population structure determines functional differences among species and ecosystem processes

2013

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Linking the structure of communities to ecosystem functioning has been a perennial challenge in ecology. Studies on ecosystem function are traditionally focused on changes in species composition. However, this species-centric approach neglects the often dramatic changes in the ecology of organisms during their development, thereby limiting our ability to link the structure of populations and communities to the functioning of natural ecosystems. Here we experimentally demonstrate that the impact of organisms on community structure and ecosystem processes often differ more among developmental stages within a species than between species, contrary to current assumptions. Importantly, we show that functional differences between species vary depending on the specific demographic structure of predators. One important implication is that changes in the demography of populations can strongly alter the functional composition of communities and change ecosystem processes long before any species are extirpated from communities.

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“…Las características biológicas del pez y su estrecha relación con los parásitos conducen a un ordenamiento anidado. S. viridis presenta distribución espacial y temporal predecible (Hernández-Miranda & Ojeda, 2006), consumo de alimento constante y definido (93% algas y 7% invertebrados; Muñoz & Ojeda, 1998) (Timi & Poulin, 2003) o al tamaño corporal del hospedero (Vidal-Martínez & Poulin, 2003), que son factores que en el caso de S. viridis no aplican.…”

Section: Discussionunclassified

Variaciones espacio temporales de la estructura comunitaria de endoparasitos en peces intermareales de Chile central: descriptores parasitologicos, composicion de especies y anidamiento

Aparicio-Rizzo

Muñoz

2017

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RESUMEN. La estructura comunitaria de parásitos en peces de Chile ha sido poco abordada a través del tiempo y el espacio, impidiendo conocer los patrones de variaciones espacio-temporales. En este trabajo se estudia si la comunidad de endoparásitos de tres peces del intermareal de Chile central difiere entre localidades y años de muestreo, mediante descriptores parasitológicos, composición de especies y anidamiento. Se recolectaron 954 peces de tres especies, Helcogrammoides chilensis, Gobiesox marmoratus y Scartichthys viridis en pozas intermareales ubicadas en lugares cercanos a las bahías de Valparaíso (~32º45'S, 33º30´S) y de Concepción (~36º28'S, 36º41'S), durante 2013 y 2014. Las comunidades parasitarias fueron analizadas y comparadas por especie de hospedero, entre los rangos espaciales (localidades) y temporales (años). Los resultados muestran diferencias no significativas en los descriptores de abundancia, riqueza y diversidad entre localidades en los tres hospederos. Sin embargo, se observaron diferencias de estos descriptores entre años en la Bahía de Valparaíso para H. chilensis y G. marmoratus. La similitud de la composición parasitaria fue baja en cada especie hospedera al comparar entre años y localidades. Las infracomunidades de endoparásitos de S. viridis presentaron un patrón anidado en el tiempo y el espacio, a diferencia de G. marmoratus que presentó un patrón azaroso. En consecuencia, las escalas espacio-temporales son factores influyentes en la estructura de la comunidad de endoparásitos, pero su influencia difiere entre los hospederos. La repetitividad parece estar asociada a la especie de pez y las características agregadas de las comunidades de sus parásitos. Estos resultados indican que otros factores, ambientales y/o ecológicos, pueden influir en su estructura comunitaria. Palabras clave: endoparásitos, estructura comunitaria, variaciones espacio-temporales, Chile.Spatial and temporal variation of the endoparasite community structure of intertidal fishes in central Chile: parasitological descriptors, species composition and nestedness ABSTRACT. The parasite community structure in fish species of Chile have scarcely been analysed through time and locations, making it difficult to understand the spatio-temporal variation patterns. In this study, we investigated whether the endoparasitic community of three intertidal fishes in central Chile exhibited spatial or temporal changes. We collected a total of 954 individuals of Helcogrammoides chilensis, Gobiesox marmoratus and Scartichthys viridis in the intertidal rocky zone in localities close to the bays of Valparaíso (~32º45'S, 33º30'S) and of Concepción (~36º28'S, 36º41'S), during in 2013 and 2014. We analized the endoparasite community for each host according to their numerical descriptors, species composition and nestedness, comparing these communities as a function of both space and time. The average richness, abundance and diversity of the parasite infracommunity did not exhibit significant difference between localities (Valparaíso vs ...

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Guild structure of carnivorous intertidal fishes of the Chilean coast: implications of ontogenetic dietary shifts

Cited by 102 publications

References 49 publications

Tracking variations in wetland use by breeding flamingos using stable isotope signatures of feather and blood

Tracking variations in wetland use by breeding flamingos using stable isotope signatures of feather and blood

Population structure determines functional differences among species and ecosystem processes

Variaciones espacio temporales de la estructura comunitaria de endoparasitos en peces intermareales de Chile central: descriptores parasitologicos, composicion de especies y anidamiento

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