C. A. Le Sueur, Thomas Say, George Ord, Isaiah Lukens, William MacLure, R. M. Patterson, Isaac Lea, William MacLure, Thomas Say, William MacLure, C. A. Le Sueur, Thomas Say, Stephen Elliott, William MacLure, George Ord, Jacob Green, C. A. Le Sueur, Benj. H. Coates, Stephen Elliott, Thomas Say, William E. Horner, Thomas Say, Samuel L. Mitchill, C. A. Le Sueur, C. S. Rafinesque, Thomas Say, Thomas Say, Thomas Say, Thomas Say, Jacob Giliiams, Isaac Lea, Thomas Say,
... of the Crustacea of the United States Genus Gammarus, Notes, An Account of the Crustacea of the ...
1818 - Gale Group | NCCO-STM 1of2
Zhonge Hou, Junbo Li, Shuqiang Li,
... crustaceans through mountain uplift: a case study of Gammarus (Amphipoda: Gammaridae) with descriptions of four novel species ... dispersal ability are geographically restricted. We used freshwater Gammarus to test this hypothesis. Sequences of two mitochondrial ( ... Taihang mountains in China. Phylogenetic analyses showed that Gammarus species were grouped into two clades, one from ... early Pliocene. Additionally, four new species are described: Gammarus incoercitus sp. nov., Gammarus benignus sp. nov., Gammarus ...
Tópico(s): Fish Ecology and Management Studies
2014 - Oxford University Press | Zoological Journal of the Linnean Society
Anna Wysocka, Michał Grabowski, Lidia Sworobowicz, Artur Burzyński, Adrianna Kilikowska, Goce Kostoski, Jerzy Sell,
... ribosomal RNA (16S rRNA) of eight known endemic Gammarus species from the Lake Ohrid valley were analysed. Phylogenetic analyses showed that endemic Gammarus species comprise an ancient species flock, with Gammarus sketi from the feeder springs being their sister ... the lake. Amongst the species inhabiting the lake, Gammarus solidus and Gammarus salemaai are morphologically and molecularly well defined. By contrast, Gammarus ochridensis, Gammarus parechiniformis, Gammarus lychnidensis, and Gammarus stankokaramani ...
Tópico(s): Identification and Quantification in Food
2013 - Oxford University Press | Zoological Journal of the Linnean Society
Zhonge Hou, Boris Šket, Cene Fišer, Shuqiang Li,
... diversification. We used Holarctic amphipods of the genus Gammarus to test this hypothesis. We sequenced four genes (5,088 bp) for 289 samples representing 115 Gammarus species. A phylogenetic analysis showed that Gammarus originated from the Tethyan region with a saline ... an increased diversification rate. The saline lineage of Gammarus dispersed to both sides of the Atlantic at ... species per million years (sp/My)]. The freshwater Gammarus, however, underwent a rapid diversification phase (0.11 ... the Tethys and landmass. In particular, the freshwater Gammarus lacustris and Gammarus balcanicus lineages had a relatively ...
Tópico(s): Fish Ecology and Management Studies
2011 - National Academy of Sciences | Proceedings of the National Academy of Sciences
The delineation of Gammarus species is controversial because of extensive intraspecific morphological variation. The current study examined DNA sequences from the mitochondrial cytochrome ... ecological data to determine the species boundaries of Gammarus species from China. The results of molecular analyses showed that Gammarus sp1, G. sp2, G. sp3, and G. sp4 ... closely related species were consistent with molecular analyses. Gammarus sp1, G. sp2, G. sp3, and G. sp4 were described as four new species: Gammarus illustris sp. nov., Gammarus clarus sp. nov., Gammarus ...
Tópico(s): Freshwater macroinvertebrate diversity and ecology
2010 - Oxford University Press | Zoological Journal of the Linnean Society
Simon Harrison, David C. Bradley, Iain T. Harris,
... help buffer the interaction between the freshwater shrimp, Gammarus pulex and a benthic fish predator, Cottus gobio , ... in such systems. Quantitative surveys were taken of Gammarus and bullheads in winter and summer in a southern English chalk stream. These indicated that Gammarus seasonally switched their habitat preference, from marginal macrophytes ... all habitats, particularly marginal macrophytes, in winter. Large Gammarus and precopula pairs were found almost exclusively in the margins in summer. This spatial separation between Gammarus and bullheads in summer, though not in winter, ...
Tópico(s): Aquatic Invertebrate Ecology and Behavior
2005 - Wiley | Oikos
Dave Kelly, Jaimie T. A. Dick, W. Ian Montgomery,
... the predatory nature of the native Irish amphipod, Gammarus duebeni celticus , and the introduced G. pulex , towards ... behaviour of B . rhodani in the presence of Gammarus , and indirect predatory interactions with juvenile Atlantic salmon, ... prey, B. rhodani survival was significantly lower when Gammarus were free to interact with nymphs as than when Gammarus were isolated from them. The invader G. pulex ... than did the native G. d. celticus . Both Gammarus spp. were active predators. 3. In `patch' experiments, ...
Tópico(s): Freshwater macroinvertebrate diversity and ecology
2002 - Wiley | Freshwater Biology
Edwin Cruz‐Rivera, Mark E. Hay,
... offered, the more mobile, non-tube-building amphipods, Gammarus mucronatus and Elasmopus levis, both fed preferentially on ... declines in growth and female gonad size for Gammarus mucronatus. In contrast, the survivorship, growth, and fecundity ... ineffective for both of the more mobile species, Gammarus mucronatus and Elasmopus levis. The ability of A. ... F., and B. Kendrick . 1975. Assimilation efficiency of Gammarus pseudolimnaeus (Amphipoda) feeding on fungal mycelium and autumn- ... type on the growth of a riverine amphipod, Gammarus fasciatus.. Canadian Journal of Fisheries and Aquatic Sciences ...
Tópico(s): Aquaculture Nutrition and Growth
2000 - Wiley | Ecology
Calum MacNeil, Jaimie T. A. Dick, Robert W. Elwood,
ABSTRACT Gammarus spp. (Crustacea: Amphipoda) are widespread throughout a diverse range of marine, freshwater and estuarine/brackish habitats, often ... in terms of both numbers and/or biomass. Gammarus spp. are the dominant macroinvertebrate prey items of ... year‐round staple. Selective predation by fish on Gammarus spp. is often linked to parasitism and the body size of the prey. Gammarus spp. populations are under increasing threat from both ... their feeding patterns to cope with non‐indigenous Gammarus prey species. Despite this, many fish predation studies ...
Tópico(s): Aquatic Invertebrate Ecology and Behavior
1999 - Wiley | Biological reviews/Biological reviews of the Cambridge Philosophical Society
Calum MacNeil, Jaimie T. A. Dick, Robert W. Elwood,
ABSTRACT Gammarus spp. are widespread throughout a diverse range of freshwater habitats and can be the dominant part of ... of studies have emphasized the herbivorous nature of Gammarus spp. and their ‘shredder’ functional feeding group (FFG) ... herbivore/predator is linked to the success of Gammarus spp. in persisting in and colonizing/invading disturbance‐ ... causal mechanism in many amphipod species replacements. Additionally, Gammarus spp. are major predators of other members of ... while many studies have emphasized fish predation on Gammarus spp., we illustrate how this fish: amphipod, predator: ...
Tópico(s): Freshwater macroinvertebrate diversity and ecology
1997 - Wiley | Biological reviews/Biological reviews of the Cambridge Philosophical Society
VLADISLAVA J. STEELE, Donald H. Steele,
SYNOPSIS. Gammarus species time the release of their young by using ovarian diapause and the duration of embryonic development. ... is influenced by photoperiod under experimental conditions. Two Gammarus species were studied. Gammarus lawrencianus is typical of the majority of Gammarus species that produce sequential broods through the summer and have a diapause in the autumn. Gammarus setosus is typical of those which have an ... day photoperiods (4L to 12L) induce vitellogenesis in Gammarus setosus, and have the opposite effect on Gammarus ...
Tópico(s): Aquatic Ecosystems and Phytoplankton Dynamics
1986 - Oxford University Press | American Zoologist
The geographic distribution of the northern Gammarus species of the northwestern Atlantic, arranged from north to south, is as follows: circumpolar, Gammarus wilkitzkii and Gammarus setosus; both shores of the Atlantic, Gammarus duebeni, Gammarus finmarchicus, Gammarus obtusatus, Gammarus oceanicus, and Gammarus stoerensis; western Atlantic, Gammarus lawrencianus, Gammarus mucronatus, and ...
Tópico(s): Marine Biology and Ecology Research
1974 - NRC Research Press | Canadian Journal of Zoology
Thomas C. Ginn, William T. Waller, Gerald J. Lauer,
The abundant Hudson River amphipod Gammarus sp. was examined for viability before and during entrainment in the Indian Point cooling water system. The mean per cent survivial of Gammarus sp. sampled during ΔT's of 7.1– ... 05) difference was detected between the survival of Gammarus sp. at the intake stations and discharge station ... the upper end of the discharge canal. Entrained Gammarus sp. experience increased initial and latent mortalities during ... condenser chlorination. Comparison of the abundances of entrained Gammarus sp. during day and night sampling periods reveals ...
Tópico(s): Freshwater macroinvertebrate diversity and ecology
1974 - Elsevier BV | Water Research
... drift and upstream movements of three species of Gammarus were investigated. Drift increased at night and with ... Untersuchungen der Drift und der Aufwanderungsaktivitat wurden an Gammarus fossarum, Gammarus pulex und Gammarus roeseli ausgefuhrt. Die Versuchstiere wurden langfristig gehaltert. Die ... im Sommerhalbjahr ausgleichen kann. Die Verteilung der drei Gammarus-Arten im Fliesgewasser erklart sich weitgehend aus diesen ... auf die Drift und die Aufwanderung aller untersuchten Gammarus-Arten grundsatzlich die gleichen Auswirkungen. Die genannten spezifischen ...
Tópico(s): Fish Biology and Ecology Studies
1972 - Schweizerbart science publishers | Archiv für Hydrobiologie
Dave Kelly, Jaimie T. A. Dick, W. Ian Montgomery, Calum MacNeil,
... environmental factors. In Irish rivers, the introduced amphipod Gammarus pulex replaces the native G. duebeni celticus in ... allowed us to uncouple the community effects of Gammarus species from environmental differences. 2. The lowland stretch ... of this stretch with G. pulex only, mixed Gammarus and G. d. celticus only communities. 3. We ... the G. d. celticus reach, with the mixed Gammarus reach intermediate. 4. Ordination indicated distinctly different associations ... were best explained by the distributions of the Gammarus species. Again, the mixed Gammarus species samples were ...
Tópico(s): Freshwater macroinvertebrate diversity and ecology
2003 - Wiley | Freshwater Biology
Brian D. Wisenden, Alecia Cline, Timothy C. Sparkes,
... the assessment of predation risk. We examined whether Gammarus minus (Crustacea: Amphipoda) exhibit antipredator behavior in response ... containing no cues (control). Relative to the control, Gammarus responded to the conspecific cue by moving to the substratum and decreasing activity. In contrast, Gammarus responded to the heterospecific cue by moving up ... to these cues confers a survival benefit to Gammarus when exposed to a predator. A green sunfish ( ... the time to the first attack increased for Gammarus exposed to conspecific cues and decreased for those ...
Tópico(s): Animal Behavior and Reproduction
1999 - Wiley | Ethology
... indigenous amphipod species this century; the North American Gammarus tigrinus and Crangonyx pseudogracilis, plus the European G. ... species combinations of the four species were found. Gammarus pulex and G. d. celticus are ubiquitous in ... however, the former species is replacing the latter. Gammarus tigrinus occurs in deep, mid-Lough areas and, ... G. pulex. Secondly, the mean density of total Gammarus was significantly higher where C. pseudogracilis was absent ... disappeared from areas dominated by the other two Gammarus species. 4. Since differential mutual predation has been ...
Tópico(s): Marine Ecology and Invasive Species
1996 - Wiley | Journal of Animal Ecology
Frédéric Thomas, François Renaud, François Rousset, Frank Cézilly, Thierry de Meeûs,
... populations of two congeneric and sympatric host species (Gammarus insensibilis and G. aequicauda), infected by the same ... Digenea) impacts reproductive behaviour, survival and physiology in Gammarus zaddachi (Amphipoda), Diseases of Aquatic Organisms, 10.3354/ ... J (2006) Host manipulation of a freshwater crustacean (Gammarus roeseli) by an acanthocephalan parasite (Polymorphus minutus) in ... KOSTADINOVA A and MAVRODIEVA R (2005) Microphallids in Gammarus insensibilis Stock, 1966 from a Black Sea lagoon: ... behaviours of two sympatric amphipod hosts: the native Gammarus pulex and the invasive Gammarus roeseli, Journal of ...
Tópico(s): Animal Ecology and Behavior Studies
1995 - Royal Society | Proceedings of the Royal Society B Biological Sciences
Raymond M. Newman, Thomas F. Waters,
Length distributions of the stream amphipod Gammarus pseudolimnaeus were obtained from analysis of the stomach contents of age I and older brook (Salvelinus fontinalis), brown (Salmo trutta), and rainbow ... and young—of—year trout. Length distributions of Gammarus in benthic and drift samples were also analyzed ... content data. For all sample dates, length of Gammarus in the stomachs was significantly greater than in ... not directly account for the length distributions of Gammarus in the stomachs. Age I and older trout ...
Tópico(s): Environmental Toxicology and Ecotoxicology
1984 - Wiley | Ecology
Gammarus wilkitzkii is a circumpolar, arctic species found from the Arctic Ocean south to Newfoundland. Females produce ... The species matures at a relatively large size.Gammarus stoerensis is an Atlantic amphiboreal species found from ... the resting stage between then and late winter.Gammarus mucronatus is found from southwestern Newfoundland south to ...
Tópico(s): Marine and fisheries research
1975 - NRC Research Press | Canadian Journal of Zoology
Adam Powell, James Hinchcliffe, Kristina Sundell, Nils‐Gunnar Carlsson, Susanne P. Eriksson,
... and growth. For early-stage European lobster, Homarus gammarus larvae, feeding ecology and body composition are largely ... of cannibalism on survival and nutrition in H. gammarus larviculture. A final experiment analysed H. gammarus zoea 1 composition, identifying deficiencies in ash and ... a species-specific, formulated dry feed for H. gammarus larviculture. Our research represents the first investigation of H. gammarus larval composition and dietary requirements and highlights decreased ...
Tópico(s): Coral and Marine Ecosystems Studies
2017 - Wiley | Aquaculture Research
Gammarus spp. are typically classified as shredders under the functional feeding group classification. In the wild and in the laboratory, Gammarus spp. will often shred leaves, breaking them down ... nutritious to consumers. Several studies have shown that Gammarus spp. show preference for conditioned leaves over nonconditioned leaves and certain fungal species to others. Furthermore, Gammarus spp. show increased survival and growth rates when ... conditioned leaves compared to non-conditioned leaves. Thus, Gammarus spp. appear to rely on the microbial biofilm ...
Tópico(s): Freshwater macroinvertebrate diversity and ecology
2011 - Hindawi Publishing Corporation | International Journal of Zoology
AK Eriksson Wiklund, Hanna Oskarsson, Gunnar Thorsén, L Krumblad,
... Sweden *Email: annkristin.eriksson@itm.su.se ABSTRACT: Gammarus spp. and Fucus vesiculosus from the Baltic Sea ... to examine potential effects in the organisms. For Gammarus spp., respiration, feeding rate and activity with and ... propranolol decreased the activity related to movement, and Gammarus spp. could not compensate for the reduced movement ... subjected to predator cues. The feeding rates of Gammarus spp. exposed to propranolol were more than 2 ... significantly affect any of the measured parameters of Gammarus spp. The GP/R was lower in algae ...
Tópico(s): Aquaculture Nutrition and Growth
2011 - Inter-Research | Aquatic Biology
Gro van der Meeren, Arani Chandrapavan, Thomas Breithaupt,
... in a mixed species group of lobsters Homarus gammarus and H. americanus Gro I. van der Meeren1, ... This study investigates if female European lobsters Homarus gammarus would sexually interact and mate with male American ... pair of male lobsters and a single H. gammarus female were recorded during 1 wk periods in ... included either dominant H. americanus or dominant H. gammarus males. The frequency and duration of social interactions ... trials. No sexual interactions occurred between species. H. gammarus females preferred to court and mate with a ...
Tópico(s): Marine and fisheries research
2008 - Inter-Research | Aquatic Biology
Dave Kelly, Jaimie T. A. Dick,
Summary 1. The amphipod Gammarus pulex , introduced to Irish rivers with the aim of enhancing trout feeding, is displacing the native Gammarus duebeni celticus . These two species are generally associated ... populations. Here, we uncouple effects of the two Gammarus species from environmental gradients. 2. A weir dissects ... invader abundance, with low abundance of other taxa. Gammarus pulex was particularly prominent in night‐time drift. ... in the other reaches. Fish generally preyed on Gammarus in proportion to its abundance, but exhibited some ...
Tópico(s): Myxozoan Parasites in Aquatic Species
2004 - Wiley | Freshwater Biology
Calum MacNeil, Robert W. Elwood, J.T.A. Dick,
... in the relative abundance of native and introduced Gammarus spp. (amphipods) compared to all other macroinvertebrates in ... marked seasonal and diel changes in salmonid diets, Gammarus was a minor prey item, representing <5 % of ... at 7 sites dominated by the native species Gammarus duebeni celticus. In these sites, larval Baetis spp. ( ... macroinvertebrate community. Salmonids rarely showed distinct preferences for Gammarus, except in the site dominated by G. pulex. Indeed, there was an avoidance of Gammarus by fish in many rivers. Therefore, the relative ...
Tópico(s): Freshwater macroinvertebrate diversity and ecology
2000 - International Association of Theoretical and Applied Limnology | Fundamental and Applied Limnology / Archiv für Hydrobiologie
Calum MacNeil, Robert W. Elwood, Jaimie T. A. Dick,
... Northern Ireland, several amphipods occur, with the native Gammarus dubeni celticus and introduced Gammarus pulex and Crangonyx pseudogracilis often being found together ... However, C. pseudogracilis suffered heavy IGP from both Gammarus species, with 33% of the tank population of C. pseudogracilis being eliminated in the presence of Gammarus within only 12 h. Such IGP may account ... of natural lotic and lentic systems where predatory Gammarus are either absent or scarce.
Tópico(s): Fish Ecology and Management Studies
1999 - Wiley | Ecography
... predation risk and flow on habitat use by Gammarus pulex was studied in three experiments conducted in ... one or two pumps. 3. In all experiments Gammarus were most abundant in pools but placement of ... of the latter. An even greater percentage of Gammarus used riffles if leaf packs were also placed ... the presence of sculpins ( Cottus gobio ) also caused Gammarus to increase use of riffles. These data indicate that Gammarus is able to evaluate differences in habitat quality ...
Tópico(s): Aquatic Invertebrate Ecology and Behavior
1996 - Wiley | Freshwater Biology
Frédéric Hervant, Jacques Mathieu, Daniel Garín, A. Fréminet,
... mo per year during the hydrological cycle) and Gammarus fossarum (an epigean species, which lives continuously in ... the subterranean Niphargus survived severe hypoxia longer than Gammarus and numerous other epigean crustaceans. During severe hypoxia Niphargus reduced its energetic expenditures compared with Gammarus. This reduction was associated with changes in locomotion ... found to be a minor end product in Gammarus, while alanine and succinate were found to be the minor end products in Niphargus. Compared to Gammarus, and to most other epigean crustaceans, Niphargus showed ...
Tópico(s): Marine Toxins and Detection Methods
1995 - University of Chicago Press | Physiological Zoology
... of the hemocyanins (Hcs) of Homarus americanus, H. gammarus and their hybrids are very similar, though not ... has six major electrophoretically separable polypeptide chains; H. gammarus Hc has four major and two minor chains; ... co-migrates with a fifth chain in H. gammarus. Thus, qualitatively, the hybrid Hc is more like that of H. gammarus than H. americanus, a similarity reflected in respiratory ... from that of H. americanus but not H. gammarus. The cooperativity of the hybrid He also differs ... from that of H. americanus but not H. gammarus Hc. The distinctive properties of H. americanus hemocyanin ...
Tópico(s): Physiological and biochemical adaptations
1993 - Marine Biological Laboratory (MBL) | Biological Bulletin