Aspects structurels et fonctionnels de la biodiversité des peuplements de poissons

Winemiller, Kirk O.

doi:10.1051/kmae:1995007

Cited by 11 publications

(8 citation statements)

References 120 publications

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“…Nevertheless, some trends evident in our data can provide insights. Specifically, when we classify fishes by their life history strategies (according to Winemiller, 1995), our results indicate that species with more 'opportunistic' strategies dominated assemblages closer to the dam, whereas assemblages further downstream along the dewatered reach contained a mix of 'opportunistic' and 'equilibrium' species (Table VI). Equilibrium species, such as cichlids, generally have more complex reproductive requirements; in the case of Puerto Viejo drainage cichlid species, these requirements include parental care (Coleman, 1999).…”

Section: Progressive Patterns Of Fish Distribution Along a Dewatered mentioning

confidence: 92%

Ecological consequences of hydropower development in Central America: impacts of small dams and water diversion on neotropical stream fish assemblages

Anderson¹,

Freeman²,

Pringle³

2006

River Research & Apps

168

145

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Small dams for hydropower have caused widespread alteration of Central American rivers, yet much of recent development has gone undocumented by scientists and conservationists. We examined the ecological effects of a small hydropower plant (Doñ a Julia Hydroelectric Center) on two low-order streams (the Puerto Viejo River and Quebradon stream) draining a mountainous area of Costa Rica. Operation of the Doñ a Julia plant has dewatered these streams, reducing discharge to $10% of average annual flow. This study compared fish assemblage composition and aquatic habitat upstream and downstream of diversion dams on two streams and along a $ 4 km dewatered reach of the Puerto Viejo River in an attempt to evaluate current instream flow recommendations for regulated Costa Rican streams. Our results indicated that fish assemblages directly upstream and downstream of the dam on the third order Puerto Viejo River were dissimilar, suggesting that the small dam (<15 m high) hindered movement of fishes. Along the $ 4 km dewatered reach of the Puerto Viejo River, species count increased with downstream distance from the dam. However, estimated species richness and overall fish abundance were not significantly correlated with downstream distance from the dam. Our results suggested that effects of stream dewatering may be most pronounced for a subset of species with more complex reproductive requirements, classified as equilibrium-type species based on their life-history. In the absence of changes to current operations, we expect that fish assemblages in the Puerto Viejo River will be increasingly dominated by opportunistic-type, colonizing fish species. Operations of many other small hydropower plants in Costa Rica and other parts of Central America mirror those of Doñ a Julia; the methods and results of this study may be applicable to some of those projects.

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Section: Progressive Patterns Of Fish Distribution Along a Dewatered mentioning

confidence: 92%

Ecological consequences of hydropower development in Central America: impacts of small dams and water diversion on neotropical stream fish assemblages

Anderson¹,

Freeman²,

Pringle³

2006

River Research & Apps

168

145

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“…) and mean catch per unit of effort of juvenile fish (J) (juvenile.10 m 2 .h 1 ) captured in the habitats of the Lower Paranapanema River basin between October 2012 and March 2013. Reproductive and life-history strategies according to Agostinho et al (2003) and Winemiller (1995) night (Tukey's test, P = 0.001 and P = 0.03, respectively) (Fig. 3A).…”

Section: Spatial Distribution and Nictemeral Variation Of Eggs And Lamentioning

confidence: 95%

“…Larvae and juveniles were identified to the lowest possible taxonomic level (Nakatani et al, 2001) and grouped according to their reproductive strategy: non-migratory (NM), do not perform migration; short distance migratory (SDM), migrate less than 100 km; long distance migratory (LDM), migrate over 100 km; external fertilization (EF); internal fertilization (IF); parental care (PC); no parental care (NPC), parents do not take care of the offspring (Agostinho, Gomes, Suzuki, & Júlio Jr., 2003). The life-history strategies of fish species were based according to Winemiller (1995): equilibrium (E), periodic (P), opportunistic (O), and intermediate between them, when the species presents factors associated to different life-history strategies. The damaged larvae and those identified above the order level, owing to their very early development stage, were assigned into the "unidentified" category.…”

Section: Study Areamentioning

confidence: 99%

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Spatial distribution and habitat use by early fish stages in a dammed river basin, Southern Brazil

Garcia

Costa

Almeida

et al. 2018

RBT

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Fish diversity loss is threatened by the construction of dams as they prevent the regular natural dispersal among populations. Thus, conservation of key riverine habitats for fish reproduction may be essential for the recruitment of new native species of fish. The present study aimed to identify key habitats for fish spawning and early development in the Paranapanema River basin, as well as to determine the taxonomic composition, reproductive and life-history strategy, and to report spatial distribution of eggs, larvae and juveniles. The importance of lagoons, tributaries, and sub-tributaries was evaluated in the Paranapanema River basin between October 2012 and March 2013. Eggs and larvae samples were collected at dawn and dusk with conical plankton nets (0.5 mm mesh size), whereas juveniles were captured during the day with seine and sieve (0.5 cm mesh size). A total of 547 eggs, 904 larvae and 1 228 juveniles were captured. We observed that 2 larvae and 288 juveniles of non-migratory species, parental care, and equilibrium life-history strategy, predominated in lagoons and tributaries. On the other hand, 13 larvae and 60 juveniles of short migratory distance, no parental care, and periodic life-history strategy predominated in sub-tributaries. The highest densities of eggs were recorded in tributaries and sub-tributaries (Tukey’s test, P = 0.001 and P = 0.03, respectively), and the highest densities of larvae were recorded for lagoons and tributaries (P = 0.005 and P = 0.0001, respectively). Captures of eggs and larvae were higher at night; while the highest catches per unit effort of juveniles were recorded for tributaries and sub-tributaries. Fish species that adopt different life-history strategies can use diverse types of habitats during the early stages. Lagoons, tributaries and sub-tributaries of the Paranapanema River play different roles in the reproductive success of fish fauna in a heavily modified basin. The preservation of spawning and nursery areas trapped between reservoirs is necessary for Neotropical fish species recruitment and survival. Rev. Biol. Trop. 66(2): 605-621. Epub 2018 June 01.

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“…Studies on other neotropical streams have shown that drought-like conditions cause crowding of aquatic biota into reduced areas and decreased resource availability (Covich et al, 2003). Furthermore, de-watering may favour more opportunistic-type (see Winemiller, 1995), colonizing fish species (e.g. Poecilia gillii) that can adapt to altered flow and habitat over equilibrium-type species (e.g.…”

Section: Ecological Consequences Of Hydropower Development In Costa Ricamentioning

confidence: 99%

Transforming tropical rivers: an environmental perspective on hydropower development in Costa Rica

Anderson

Pringle

Rojas³

2006

Aquatic Conservation

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ABSTRACT1. Tropical rivers are increasingly being altered by hydropower dams. In Costa Rica, more than 30 hydropower plants were built during the 1990s and more dams are being proposed. Hydropower dams currently provide more than 80% of electricity consumed by the country's 4 million residents, yet most of Costa Rica's hydropower potential remains untapped.2. Ecological consequences of dams in Costa Rica stem primarily from river fragmentation, stream de-watering, and downstream hydrological alterations. Dams affect distribution and abundance of aquatic biota, especially migratory species. Cumulative effects of multiple dams on individual river basins, especially in the northern part of the country, are also of concern but have not been adequately documented.3. In light of recent hydropower development, we recommend conservation strategies that protect remaining free-flowing rivers, call for assessment of ecological impacts of dams on a broader scale, encourage research on aquatic systems and sustainable hydropower technologies, and promote the development of methods for estimating environmental flows for Costa Rican rivers.

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Aspects structurels et fonctionnels de la biodiversité des peuplements de poissons

Cited by 11 publications

References 120 publications

Ecological consequences of hydropower development in Central America: impacts of small dams and water diversion on neotropical stream fish assemblages

Ecological consequences of hydropower development in Central America: impacts of small dams and water diversion on neotropical stream fish assemblages

Spatial distribution and habitat use by early fish stages in a dammed river basin, Southern Brazil

Transforming tropical rivers: an environmental perspective on hydropower development in Costa Rica

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