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Στεργίου, Κωνσταντίνος Ι.; Karpouzi, Vasiliki

doi:10.1023/a:1020556722822

Cited by 429 publications

(89 citation statements)

References 86 publications

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“…Generally, while mean TROPH values per species increased with increasing size, similar to other studies (Stergiou andKarpouzi 2002, Simon et al 2009), some species such as C. gariepinus and O. andersonii showed an opposite trend where younger fish occupied higher trophic levels than older fish. Furthermore, Brycinus lateralis, (the smallest species studied) occupied higher trophic levels than some large sized species.…”

Section: Tablesupporting

confidence: 88%

“…Winemiller and KelsoWinemiller (2003) also observed significant dietary overlaps between both juvenile and adult Oreochromis andersonii and Tilapia rendalli in the Zambezi River. That notwithstanding, Stergiou and Karpouzi's (2002) fractional trophic levels revealed the existence of ontogenetic diet shifts within several species in this study. What is particularly important to note is that the system (i.e., the Okavango Delta) is not static, but is dynamically driven by seasonal (and inter-annual) flooding patterns.…”

Section: Tablesupporting

confidence: 52%

“…Trophic levels were estimated using TrophLab (Pauly et al 2000) based on the percentage contribution (by weight) of each prey item to the diet. Similar to Stergiou and Karpouzi (2002), we used the "Diet composition" routine in the model to estimate the trophic levels. Fish were then classified according to Stergiou and Karpouzi's (2002) fractional trophic levels as:…”

Section: Methodsmentioning

confidence: 99%

“…Similar to Stergiou and Karpouzi (2002), we used the "Diet composition" routine in the model to estimate the trophic levels. Fish were then classified according to Stergiou and Karpouzi's (2002) fractional trophic levels as:…”

Section: Methodsmentioning

confidence: 99%

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Dynamics of the feeding ecology of selected fish species from the Okavango River delta, Botswana

Mosepele¹,

Mosepele²,

Wolski³

et al. 2012

Acta Icth et Piscat

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Mosepele K., Mosepele B., Wolski P., Kolding J. 2012. Dynamics of the feeding ecology of selected fish species from the Okavango River delta, Botswana. Acta Ichthyol. Piscat. 42 (4): 271-289.Background. This study contributes to the understanding of the potential impact of changes in flooding patterns and (potential) fish production as a consequence of upstream developments in floodplain systems. Therefore, stomachs of eight fish species from the Okavango Delta were analysed to evaluate the feeding ecology of floodplain fish (and the effect of seasonal flooding), using the delta as a case study. Materials and methods. In total, 2101 fish stomachs of eight species, representing six families, were collected (in all seasons) from the delta using experimental fishing nets, from 2004 to 2009. Frequency of occurrence, Levin's diet breadth index, Pianka's overlap index, trophic levels, and Bray-Curtis similarities were used to evaluate feeding preferences. Detrended correspondence analysis was used to study temporal variations in diet. Multiple linear regressions were used to determine the influence of flooding on diet. ANOVA and MANOVA were used to determine the level of significance among variables, while LSD post hoc analysis revealed the source of significance.Results. Cluster analysis and Pianka's index highlighted inter-and intra-specific competition for food among different species and age classes, ANOVA highlighted dynamic changes in inter-and intra-specific trophic level partitioning, while detrended analysis showed that the terrestrial environment is subsidizing the aquatic environment. Regression analysis showed that Schilbe intermedius diet was driven by discharge (F = 7.03; P = 0.045; R 2 = 0.58) while that of Marcusenius macrolepidotus was driven by water depth (F = 25.88; P = 0.04; R 2 = 0.93). Conclusion.The terrestrial-aquatic ecotone is important in fish growth of seasonal floodplains. Energy uptake is optimised through cannibalism to ensure species survival. Furthermore, species inter-relations are dynamic due to variations in food availability driven by seasonal flooding, which shortens and lengthens the food chain periodically. This dynamic relation is pronounced at low floods when predation and competition increases within the fish community. The evidence from this study has shown that predation, cannibalism, inter-and intra-specific competition are regulating factors in floodplain fish communities, driven by seasonal flooding.

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Section: Tablesupporting

confidence: 88%

Section: Tablesupporting

confidence: 52%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Dynamics of the feeding ecology of selected fish species from the Okavango River delta, Botswana

Mosepele¹,

Mosepele²,

Wolski³

et al. 2012

Acta Icth et Piscat

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“…Mean RGL and ILW values (RGL m and ILW m , respectively), as provided by the original author, were checked for normality (both were not normally distributed, since the values of skewness and kurtosis were outside the -2 to +2 range; Zar 1999) and grouped using the functional trophic groups, identified for the Mediterranean based on 332 stocks of 146 species by Stergiou and Karpouzi (2002).…”

Section: Methodsmentioning

confidence: 99%

Intestine Morphometrics of Fishes: A Compilation and Analysis of Bibliographic Data

Karachle¹,

Στεργίου²

2010

Acta Icth et Piscat

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In fishes, both external (e.g., shape, size and position of mouth, shape of caudal fin) and internal morphology (e.g., stomach shape and size, gut length: GL) provide important information on a species' feeding ecology (e.g., Keast and Webb 1966, Schmitt and Holbrook 1984, Kaiser and Hughes 1993, Juanes 1994, Juanes and Conover 1994, Hart 1997, Wootton 1998. Exploration of the relations between various feeding-related morphological characteristics with body length ** , such as body girth (e.g., Stergiou and Karpouzi 2003), mouth dimensions (horizontal and vertical mouth opening, gape area; e.g., Karpouzi and Stergiou 2003), and GL (e.g., Karachle and Stergiou 2006, 2007), are of great importance for understanding the biology and ecology of fishes (e.g., Peters 1983, Kramer and Bryant 1995a, b, Wootton 1998, Froese and Pauly 2000, as well as pinpointing the ecological role of a species in the aquatic food webs (e.g., Stergiou 2003, Froese and Pauly 2008).Gut length, in particular, provides important information on species' feeding habits in almost all vertebrate classes, e.g., fishes (Kramer and Bryant 1995a); reptiles (O'Grady et al. 2005); birds (e.g., Ricklefs 1996); and mammals (e.g., Chivers and Hladik 1980). In fishes, it can also be used as a reference point for interspecific comparisons (e.g., Al-Hussaini 1947). In this work, information on intestinal indices and relations between GL and body length and weight were compiled from the available bibliography. This data was related to species' feeding habits, fractional trophic level values (TROPHs) and taxonomy, as provided in FishBase (Froese and Pauly 2008), in order to identify possible patterns and correlations of feeding habits and evolutionary traits with intestinal growth. Background. The examination of morphological features related to feeding in fish, as well as their relation with body length, are of increasing scientific interest. In the present study, information on intestine (gut) morphometrics that appear in the relevant literature has been compiled, analysed, and discussed. Materials and Methods. Search of gut-related bibliography was conducted, using online literature databases on fish feeding and ecomorphology. The resulted data was tabulated. Relationships between mean, minimum, and maximum relative gut length (RGL) and intestine length weight index (ILW, Zihler's index), as provided by the original author, with species' fractional trophic levels (TROPHs; extracted from FishBase) were explored. Finally, using the relations between gut length (GL) and body length (L) provided by the original authors, regressions were reconstructed and compared based on species' feeding habits and taxonomy.Results. The amount of information related to gut morphometrics referred to 498 species. The relations between GL and L referred to 71 species, but four species were omitted from the analyses. Mean, minimum, and maximum RLG and ILW values were negatively related (for all cases: P < 0.01) with TROPH. The GL-L regressions performed for 67 species revealed ...

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