Reproductive strategies of two species of cyprinids in a stream with Mediterranean regimen (SW Spain).

Soriguer, Milagrosa C.; Bravo, R.; Vallespin, C.; Gómez-Cama, Carmen; Hernando, J. A.

doi:10.1127/archiv-hydrobiol/148/2000/119

Cited by 10 publications

(15 citation statements)

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“…The situation in the following rainy period seems to confirm this hypothesis, since at this time the age classes predominant in the sampling area are 0+ (alevins) and the intermediate classes, 6+, 7+ and 8+ (those of reproduction age). These intermediate age classes, of 5+ to 8+, are the ones that contribute most in percentage terms by age class, to fecundity; and the reproductive effort of females during the spawning period reaches its maximum values at age class 7+ [29,30]. The situation observed in the summer of 1997, with the almost complete disappearance of individuals of age class 0+ does not invalidate this conclusion: the explanation for this is the presence of the largemouth bass.…”

Section: Discussionmentioning

confidence: 76%

“…In other words, the predominant age classes are again the alevins and those of reproduction age. For this population, the age class contributing most to total fecundity and making the greatest reproductive effort is 5+, with successive ages showing diminishing importance [29,30].…”

Section: Discussionmentioning

confidence: 99%

“…This must be due to the physiological changes in the fish that take place during this period, such as gonad development and an increase in food intake, with subsequent fattening of the fish [29,30].…”

Section: Discussionmentioning

confidence: 99%

“…This flow irregularity has caused the fish communities to adapt their life strategies in respect to their life cycles [8,9,[29][30][31], their diet [12,29] and migrations [24].…”

Section: Introductionmentioning

confidence: 99%

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The dynamics of fish populations in the Palancar stream,a small tributary of the river Guadalquivir, Spain

et al. 2001

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-The relationship between flooding and changes in the size distribution of fish populations in the Palancar stream confirms observations in other rivers. On average, density decreased by 36.2 % and biomass increased by 14.5 %, passing from a period of severe drought to one of heavier than normal rains. Precipitation is the most important of the many factors affecting the populations of the Palancar stream; the most evident changes all occurred after the drought. During the drought period, the marked seasonal fluctuation in flow was the most important factor regulating the population dynamics. Fish density and biomass varied in proportion to the water volume. During the rainy period, the studied section of the river was found to be an important reproduction and nursery area, with juveniles and individuals of reproduction age dominating. The presence of Micropterus salmoides, an introduced piscivorous species, is another factor affecting the population dynamics in the Palancar stream. The observed absence of age 0+ individuals of the dominant populations is considered a direct effect of predation.

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Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…This flow irregularity has caused the fish communities to adapt their life strategies in respect to their life cycles [8,9,[29][30][31], their diet [12,29] and migrations [24].…”

Section: Introductionmentioning

confidence: 99%

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The dynamics of fish populations in the Palancar stream,a small tributary of the river Guadalquivir, Spain

et al. 2001

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“…Furthermore, in recent experiments in captivity we found that the number of spawns over a period of time was at least three fold higher than the number of reproducing females (M. Goren, unpublished data). Multiple spawning has been reported for other cyprinids in mediterranean-type streams (e.g., Ferná ndez-Delgado and Herrera 1995; Pires et al 2000;Ribeiro et al 2000;Soriguer et al 2000).…”

Section: Multiple Spawningmentioning

confidence: 93%

Reproductive strategy of a small endemic cyprinid, the Yarqon bleak (Acanthobrama telavivensis), in a mediterranean-type stream

2006

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A mediterranean-type climate exists in five widely separated regions; the Mediterranean basin, parts of western North America, parts of western and southern Australia, southwestern South Africa and parts of central Chile. Streams in these regions feature seasonal disturbances of contrasting hydrology with high predictability of the timing of flooding and drying but low constancy. We would expect fish living in these streams to avoid scouring flow and breed after cessation of the flood period. The aim of the present study was to examine the adaptation of the Yarqon bleak, Acanthobrama telavivensis, an endemic cyprinid in the coastal streams of Israel, to mediterranean-type stream 1 conditions. For that we studied its reproductive strategy (age at maturity and life span, gonad activity, oocyte maturation, spawning activity and habitats, appearance of juveniles), in a major costal stream (Yarqon). Our findings show that the Yarqon bleak exhibits life history traits attuned with a mediterranean-climate hydrologic regime. It breeds in late winter and early spring, a window of opportunity between flash floods and habitat desiccation. Being a multiple spawner allows the fish to compensate for the potential loss of part of its reproductive output due to scouring flows of late floods. The ability of the Yarqon bleak to spawn on different substrate-types enables it to take advantage of different stream conditions that pertain in different years. The fish attains preadult size (ca. 33-42 mm) within the first year, prior to drying out of most stream reaches, and matures by the beginning of the second year (males >41; females >42 mm). The cost of these tactics is a short life span (4-5 age groups). The reproductive strategy of the Yarqon bleak falls into the category of in-channel breeding but, unlike the case suggested by a low flow recruitment model, the fish breed during the period of flood cessation, a transitional time between high and low flows, rather than at the time of low flow. Breeding at this time of the year in mediterranean-type streams puts early stages somewhat at risk of being washed away by late floods, but gains them a longer period of growth under favorable conditions. We suggest an additional positive tradeoff that should be investigated: the reduced competition with age 0 of other fish that breed later in the season. This suggested model of recruitment during the period of flood cessation seems appropriate for fish in streams with 1 mediterranean-written with a small m, is used in connection with climate or ecological region and is distinguished from Mediterranean that is used in a geographical context, referring to the Mediterranean basin.

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Assessing the effects of sewage effluents in a Mediterranean creek: fish population features and biotic indices

2012

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Sewage effluents are one of the main anthropogenic stressors in Mediterranean rivers. The establishment of a cause-effect relationship is hindered in natural systems by the existence of confounding factors (i.e. biotic interactions). Here we analysed the effects that anthropogenic stressors have on a mono-specific fish community (Iberian redfin barbel population, Barbus haasi) inhabiting the northern edge of its distribution range. In Spring 2004, a total of 40 consecutive sampling sites were surveyed in Vallvidrera creek, and 1,331 specimens were measured and weighed. A principal component analysis was performed to synthesize the information provided by 22 environmental variables. Analysis of variance, bivariate correlation analyses and multiple linear regressions were then used to determine the influence of the environmental gradients built (water quality, hydromorphology, woods and macrophytes, and degree of silting) on fish population features (fish size, body condition status, density and biomass). The findings revealed that water quality was the most significant environmental gradient for this fish population. In particular, fish density decreases and fish length increases in those sites exposed to sewage. Additionally, our results showed the best body condition of those specimens inhabiting fast flow reaches which confirms the rheophilous condition of B. haasi. However, these findings were unnoticed for the current version of the index of biotic integrity using fish as bioindicators in Catalonia. Resource managers need to refine diagnostic tools in order to detect subtle deleterious changes on fish communities before they become evident at population scale. Conservation measures should be focused in these small streams in where the best preserved native fish populations usually inhabit. This study suggests the need to change water management policies in Mediterranean rivers to improve the water quality of sewage effluents and increase the dilution power of these rivers.

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Reproductive strategies of two species of cyprinids in a stream with Mediterranean regimen (SW Spain).

Cited by 10 publications

References 0 publications

The dynamics of fish populations in the Palancar stream,a small tributary of the river Guadalquivir, Spain

The dynamics of fish populations in the Palancar stream,a small tributary of the river Guadalquivir, Spain

Reproductive strategy of a small endemic cyprinid, the Yarqon bleak (Acanthobrama telavivensis), in a mediterranean-type stream

Assessing the effects of sewage effluents in a Mediterranean creek: fish population features and biotic indices

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