Effects of land use on fish assemblages in Patagonian low order streams

Prinzio, Cecilia Yanina Di; Casaux, Ricardo; Miserendino, María Laura

doi:10.1051/limn/2009030

Cited by 24 publications

(12 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The streams considered in this study were dominated by the exotic O. mykiss in terms of both density and biomass, whereas the native H. macraei was scarcely represented in the samples, similar to findings by Di Prinzio et al (2009). Hatcheria macraei is a rheophilic and negatively phototactic catfish (Menni, 2004) which inhabits fast flowing, clear, cold and well-oxygenated waters (Ringuelet 1975).…”

Section: Discussionsupporting

confidence: 78%

Dietary overlap among native and non-native fish in Patagonian low-order streams

Prinzio

Casaux

2012

Ann. Limnol. - Int. J. Lim.

Self Cite

View full text Add to dashboard Cite

-The diet composition and feeding strategy of native and exotic fish species were studied from May 2005 to February 2006 in three Patagonian low-order streams. A total of 464 fish were caught, which belonged to the exotic species Oncorhynchus mykiss (270), Salmo trutta (177) and the native species Hatcheria macraei (17). The analysis of 336 stomach contents indicated that at the individual level, the three species had a generalized feeding strategy based on benthic invertebrates (Plecoptera, Trichoptera, Coleoptera and Diptera). In the three streams, the widest population niches were observed in winter. There was, however, also a slight tendency toward an increased between-phenotype contribution to the niche width in same season, indicating that a small proportion of individuals within the fish populations specialized by predominantly feeding on a few specific prey species. Hence, the wide population niche widths observed throughout the year were partly a result of mixed individual feeding strategies within the populations. The higher diet overlaps were registered between exotics O. mykiss-S. trutta at Glyn and Carbo´n, and O. mykiss and the native H. macraei at Manguera, but it changed markedly through the year, perhaps depending on temporal changes in food availability suggesting a competitive coexistence of these species. This is mainly related to the fact that both species changed their food preferences in spring and foraged almost exclusively on Aubertoperla illiesi. This implies that in order to reduce the predation risk or the inter-specific competition for food, the fish species might partition the feeding habitats.

show abstract

Section: Discussionsupporting

confidence: 78%

Dietary overlap among native and non-native fish in Patagonian low-order streams

Prinzio

Casaux

2012

Ann. Limnol. - Int. J. Lim.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Both Rosario lake and Nant y Fall river are used for sport fishing since they are inhabited by the native pejerrey, Odonthestes hatchery (Eigenmann) and the exotic rainbow trout, Oncorhynchus mykiss (Walbaum). The indigenous small benthic catfish, Hatcheria macraei (Girard) is also present in the river (Di Prinzio et al 2009). …”

Section: Study Sitementioning

confidence: 99%

Life cycle phenology, secondary production, and trophic guilds of caddisfly species in a lake-outlet stream of Patagonia

Brand

Miserendino

2012

Limnologica

Self Cite

View full text Add to dashboard Cite

a b s t r a c t Lake-outlets are transitional areas recognized as highly productive ecosystems in terms of density and biomass of aquatic insects. Life cycle, secondary production, trophic guilds and environmental constraints of caddisfly assemblages were investigated on a natural lake-outlet stream (Nant y Fall) in Patagonia, Argentina. We investigated the site monthly from May 2007 to April 2008 by recording environmental data and sampling caddis larvae using a Surber sampler at riffle areas (n = 36). Mastigoptila longicornuta, Smicridea annulicornis, Smicridea frequens, Brachysetodes quadrifidus and Parasericostoma ovale displayed well synchronized univoltine life cycles, while Neoatopsyche brevispina, Neopsilochorema tricarinatum, showed an asynchronous development pattern, although most of them had an extended recruitment, similar to those reported for non lake-outlet streams in the area. Annual secondary production per species varied from 8.22 (B. quadrifidus) to 3568.83 mg m −2 y −1 (P. ovale), with overall caddisfly production amounting to 4.8 g m −2 y −1 . Shredder/collector-filterer ratio was 3.3/1 suggesting that the system was detrital based. Redundancy analysis indicated that seasonally dynamic variables such as discharge, benthic particulate organic matter and temperature were the main predictors of seasonal caddisfly assemblage variation. We propose that the variety of food resources and the significant spatial heterogeneity at lake-outlet streams contribute to sustain a rich caddisfly community.

show abstract

“…; Di Prinzio et al . ). Few studies in the Patagonian region have focused on the relationship between its diet and macroinvertebrate availability in the environment (Buria et al .…”

Section: Introductionmentioning

confidence: 97%

Feeding strategy of the non‐native rainbow trout, Oncorhynchus mykiss, in low‐order Patagonian streams

Prinzio

Miserendino

Casaux

2013

Fisheries Management Eco

View full text Add to dashboard Cite

The dietary composition and feeding strategy of rainbow trout, Oncorhynchus mykiss (Walbaum), in two low‐order Patagonian streams were studied. Benthic macroinvertebrate availability was estimated in both riffles and pools. Fish stomach contents were examined to determine prey richness and diversity, prey electivity, food‐niche width, and the feeding strategy employed by trout throughout the year. Availability of benthos varied seasonally with Ephemeroptera, Trichoptera, Plecoptera and Diptera species dominating. Rainbow trout diet was composed mainly of benthic macroinvertebrates, followed by terrestrial insects, fish, algae and plants. Different trout size classes segregated the use of food resources to reduce predation pressure. Elected prey included organisms displaying no to high mobility. A high feeding plasticity allows trout to buffer changes in food availability by switching from a specialised to a generalised feeding behaviour. Consequently, trout may exploit abundant but temporary food resources opportunistically, which would explain their marked expansion in Patagonian environments.

show abstract

Effects of land use on fish assemblages in Patagonian low order streams

Cited by 24 publications

References 37 publications

Dietary overlap among native and non-native fish in Patagonian low-order streams

Dietary overlap among native and non-native fish in Patagonian low-order streams

Life cycle phenology, secondary production, and trophic guilds of caddisfly species in a lake-outlet stream of Patagonia

Feeding strategy of the non‐native rainbow trout, Oncorhynchus mykiss, in low‐order Patagonian streams

Contact Info

Product

Resources

About