Impact on Stream Benthic Prey by Benthic vs Drift Feeding Predators: A Meta-Analysis

Dahl, Jan; Greenberg, Larry

doi:10.2307/3546054

Cited by 98 publications

(116 citation statements)

References 32 publications

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“…Our low mortality estimate for single drift events of G. pulex suggests that actively entering the drift is likely to be adaptive in a number of situations, from life-or-death situations such as avoidance of benthic predators (Dahl and Greenberg 1996;Lima 1998) to simple patch-search behaviors (Bohle 1978;Kohler 1984Kohler , 1985. Thus, on a short-term level, we can explain the use of drift for predator escape and foraging, but we also suggest that a long-term perspective allows for an explanation of diel variations in drift related to avoidance of drift-feeding fish (Flecker 1992;Forrester 1994) and adaptations to minimize accidental dislodgement from the streambed.…”

Section: Discussionmentioning

confidence: 99%

Estimation of intergenerational drift dispersal distances and mortality risk for aquatic macroinvertebrates

Humphries¹,

Ruxton²

2003

Limnology & Oceanography

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Estimates of the total lifetime dispersal capacity of individuals comprising invertebrate drift in streams and rivers have proved very difficult to determine empirically. Here we use recent data on dispersal in the amphipod Gammarus pulex L. to illustrate a method for estimating the total distance an individual is likely to travel downstream during the period between hatching and its first reproductive episode. For the system we consider, this estimate is on the order of 1.5 km. This method may be useful in future explorations of the ecological relevance of within-stream displacement and population persistence. Furthermore, we are able for the first time to estimate an upper bound for the mortality risk associated with entering the drift, which, for the G. pulex population under consideration, is less than 1% for individual drift events. We suggest that this risk may not be nearly as high as had previously been thought. These mortality and distance estimates may illustrate a fundamental difference between dispersal in lotic systems and those in other habitats, in that the mean dispersal distance is of much higher ecological relevance than that of rare long-distance events.

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Section: Discussionmentioning

confidence: 99%

Estimation of intergenerational drift dispersal distances and mortality risk for aquatic macroinvertebrates

Humphries¹,

Ruxton²

2003

Limnology & Oceanography

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“…Vitousek (1990) mentioned that in freshwater systems, predators frequently forage selectively on certain prey types, whereas Townsend (2003) suggested that predation has important effects at individual, population, community and ecosystem levels. Thus, predation represents a strong selective force that shapes and determines the structure of populations at lower trophic levels (Peckarsky, 1982;Bechara et al, 1992), and can alter the abundance and composition of the prey community (Dahl and Greenberg, 1996). Moreover, if the interactions are of great magnitude, predators can also alter the abundance of resources at lower trophic levels indirectly via "trophic cascade" by reducing consumer abundance and the consumer's consumption of resources (Bro¨nmark et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

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

Prinzio

Casaux

2012

Ann. Limnol. - Int. J. Lim.

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-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.

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“…While it is known that predation may have localized effects on drift concentration (i.e., causes depletion immediately downstream of a fishes focal point; Hughes 1992; Hayes et al 2007), an implicit assumption of most drift-foraging models is that there are no active feedbacks from predation on drifting invertebrate behaviour or populations (i.e., drift-feeding is assumed to be donor-controlled). Several studies have failed to detect an effect of drift-feeding fish on the benthos (Allan 1982;Dahl and Greenberg 1996); however, there is some evidence that predation on drift may have top-down effects (Forrester 1994;Diehl et al 2000;Meissner and Muotka 2006), and the ability of trout to consume a significant fraction of benthic production is well documented (e.g., Huryn 1996). Incorporating a major feedback between predation and drift production (entry rates) could substantially alter current drift-foraging modelling approaches.…”

Section: Consequences Of Drift Variation For Energy Flux To Fishmentioning

confidence: 99%

Causes and consequences of invertebrate drift in running waters: from individuals to populations and trophic fluxes

Naman

Rosenfeld

Richardson

2016

Can. J. Fish. Aquat. Sci.

114

102

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Invertebrate drift, the downstream transport of aquatic invertebrates, is a fundamental ecological process in streams with important management implications for drift-feeding fishes. Despite long-standing interest, many aspects of drift remain poorly understood mechanistically, thereby limiting broader food web applications (e.g., bioenergetics-based habitat models for fish). Here, we review and synthesize drift-related processes, focusing on their underlying causes, consequences for invertebrate populations and broader trophic dynamics, and recent advances in predictive modelling of drift. Improving predictive models requires further resolving the environmental contexts where drift is driven by hydraulics (passive drift) versus behaviour (active drift). We posit this can be qualitatively inferred by hydraulic conditions, diurnal periodicity, and taxa-specific traits. For invertebrate populations, while the paradox of population persistence in the context of downstream loss has been generally resolved with theory, there are still many unanswered questions surrounding the consequences of drift for population dynamics. In a food web context, there is a need to better understand drift-foraging consumer-resource dynamics and to improve modelling of drift fluxes to more realistically assess habitat capacity for drift-feeding fishes.Résumé : La dérive d'invertébrés, soit le transport vers l'aval d'invertébrés aquatiques, est un processus écologique fondamental dans les cours d'eau qui a d'importantes conséquences pour les poissons qui se nourrissent d'aliments à la dérive. Malgré un intérêt de longue date, de nombreux aspects de la dérive demeurent mal compris d'un point de vue mécaniste, ce qui limite les applications plus larges des réseaux trophiques (p. ex. les modèles d'habitat reposant sur la bioénergétique pour les poissons). Nous passons en revue et résumons les processus associés à la dérive, en mettant l'accent sur leurs causes sous-jacentes, les conséquences pour les populations d'invertébrés et la dynamique trophique plus large, ainsi que les avancées récentes en modélisation prédictive de la dérive. L'amélioration des modèles prédictifs nécessite une meilleure résolution des milieux dans lesquels la dérive est mue, d'une part, par l'hydraulique (dérive passive) ou, d'autre part, par le comportement (dérive active). Nous postulons que cela peut être inféré de manière qualitative à partir des conditions hydrauliques, de la périodicité diurne et de caractères propres aux taxons. Pour les populations d'invertébrés, si le paradoxe de la persistance des populations dans le contexte de perte en aval a généralement été résolu en faisant appel à la théorie, de nombreuses questions demeurent quant aux conséquences de la dérive pour la dynamique des populations. Dans un contexte de réseaux trophiques, il est nécessaire de mieux comprendre la dynamique dérive-consommateur s'alimentant-ressource et d'améliorer la modélisation des flux de dérive pour évaluer de manière plus réaliste la capacité des habitats p...

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Impact on Stream Benthic Prey by Benthic vs Drift Feeding Predators: A Meta-Analysis

Cited by 98 publications

References 32 publications

Estimation of intergenerational drift dispersal distances and mortality risk for aquatic macroinvertebrates

Estimation of intergenerational drift dispersal distances and mortality risk for aquatic macroinvertebrates

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

Causes and consequences of invertebrate drift in running waters: from individuals to populations and trophic fluxes

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