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  • 1
    Electronic Resource
    Electronic Resource
    Fish community structure, spatial distribution and feeding ecology in a beaver pond (1990)
    Springer
    Environmental biology of fishes 27 (1990), S. 201-214 
    Details
    ISSN: 1573-5133
    Keywords: Aquatic habitat ; Aquatic invertebrates ; Competition ; Cyprinids ; Growth ; Lepomis ; Prey resources ; Species richness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis The fish community of a small (2.7 ha) Ontario beaver pond was analyzed relative to predictions based on its small size, shallow depth, brief existence and isolation from more permanent water bodies. The predictions were: (1) species richness will be lower than that of more permanent water bodies in the area, (2) fish will be mainly of small body size, (3) species will be randomly distributed across habitats, and (4) there will be a high degree of diet overlap between species and age classes. The first and second predictions were supported. The pond consisted of 10 resident species in 1985, and at least seven in 1988. Species richness was below the average of 13.2 found in four lakes in the vicinity, but greater than the 3.1 predicted by a species-area curve for non-acidified lakes in Ontario. All species except pumpkinseed, yellow perch and brown bullheads were small-bodied with short life spans and high population turnover rates, and few fish above 100 mm were present. Predictions 3 and 4 were not supported. Habitat occupation was nonrandom, and high diet separation occurred, particularly in August when food limitation was evident. While beaver ponds lack the range of habitats and the diversity of species of lake environments, low prey density and high fish density nevertheless appear to foster resource partitioning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00001673
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  • 2
    Electronic Resource
    Electronic Resource
    A comparison of zygote survival of native and non-native walleye stocks in two Georgian Bay rivers (1993)
    Springer
    Environmental biology of fishes 38 (1993), S. 379-383 
    Details
    ISSN: 1573-5133
    Keywords: Early life history ; Egg ; Incubation ; pH ; Rehabilitation ; Stizostedion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Poor natural recruitment of a Georgian Bay walleye stock that spawns in the Shawanaga River has been attributed to poor survivorship of early life stages. I investigated whether low zygote survival was part of the problem by conducting an in-situ incubation experiment with artificially fertilized eggs from the Shawanaga and the nearby Magnetawan River stocks. Both rivers have low buffering capacity (5–6.5 mg·l−1 alkalinity), but moderately low pH (5.5) had only been recorded in the Shawanaga. Zygotes were reared in both rivers. Minimum pH during incubation was 6.2 in the Shawanaga and 6.8 in the Magnetawan River. Mean survival rate to hatching strongly favoured the native stock in both rivers (86 vs. 25 % in the Shawanaga River and 80 vs. 40% in the Magnetawan River), and these differences were statistically significant. The results suggest that viability of Shawanaga zygotes is not a problem, but a low pH effect on zygote survival could not be inferred from the relatively high pH of Shawanaga water in the spring of 1990. The large difference in hatching success between native and non-native stocks was unexpected, and may have been the result of stock-specific adaptation to differing cation: anion and/or metal concentrations in the two rivers, or to some other factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007532
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of fertilization regime on juvenile walleye growth and prey utilization in rearing ponds (1989)
    Springer
    Environmental biology of fishes 26 (1989), S. 129-142 
    Details
    ISSN: 1573-5133
    Keywords: Chironomidae ; Food consumption ; Percidae ; Production ; Survival ; Stizostedion ; Zooplankton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis The effect of two contrasting fertilization regimes on juvenile walleye growth, survival and harvest was tested in six identical rearing ponds treated with fermented soybean meal at either a constant (36 g m−3week−1) or a progressively reduced (32 to 0 g m−3week−1) rate. Walleye length, percent survival and biomass harvest in constant fertilization ponds were 32, 83 and 294% greater, respectively, than those of reduced fertilization ponds. Chironomid larvae and pupae were the dominant prey (in terms of biomass) in juvenile walleye larger than 22 mm TL. Mean chironomid biomass was significantly higher in the constant fertilization ponds (5.1 vs. 1.7 g dry wt m−2), particularly after peak emergence around week 4. Zooplankton were less important prey after week 2, and mean zooplankton density was not significantly different between treatments. From these data we conclude that better walleye performance in the constant fertilization ponds was due to higher chironomid density during the last half of the experiment. Our findings are reviewed in light of current knowledge of juvenile walleye feeding ecology and contemporary pond culture procedures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00001029
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  • 4
    Electronic Resource
    Electronic Resource
    Space use and feeding patterns of an offshore fish assemblage in a shallow mesotrophic lake (1992)
    Springer
    Environmental biology of fishes 34 (1992), S. 159-170 
    Details
    ISSN: 1573-5133
    Keywords: Alosa ; Aquatic system ; Depth distribution ; Habitat ; Lepomis ; Notemigonus ; Ontario ; Perca ; Pomoxis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Diel and spring/summer space-use and feeding patterns were investigated in an assemblage dominated by five fish species occupying the offshore waters of Lake Opinicon, a shallow mesotrophic lake in southeastern Ontario. We assessed fish distribution and diel movement in May and July through the use of gill nets set at various depths in 1.5–7.0 m depth contour zones, supplemented by observations of fish reaction to the nets. Golden shiners and alewives occupied the upper part of the water column, with the former concentrated at the littoral zone-open water interface, and the latter in the open water. Yellow perch occupied the lower part of the water column in all depth contours. Bluegills were abundant in the upper to midwater depths in all contour zones; black crappies were concentrated in the 2.5–3.5 m zones. All of these species showed either a diel or a spring-summer change in distribution pattern. Bluegills were more abundant in offshore locations in July, whereas golden shiners and yellow perch were more abundant onshore in May. Alewives and black crappies showed distinct diel movements in July, as they were largely absent from the study area during the day, but returned at night to feed. In general, there was more spatial separation among the five species in July than in May. Patterns of spatial distribution among the species generally corresponded with the type and variety of prey consumed, and with diel movement of prey in the case of water column feeders. Other factors that apparently affected spatial distribution and seasonal shifts in this assemblage were risk of predation (golden shiner), spawning activity (alewife), and a decline in prey abundance from spring to summer (bluegill and yellow perch).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00002391
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  • 5
    Electronic Resource
    Electronic Resource
    Growth and food of young-of-the-year brook charr,Salvelinus fontinalis, in lake and creek environments (1993)
    Springer
    Environmental biology of fishes 37 (1993), S. 131-138 
    Details
    ISSN: 1573-5133
    Keywords: Bioenergetics ; Habitat ; Social behaviour ; Timber harvesting ; Fish ; Salmonid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Growth and diet of brook charr,Salvelinus fontinalis, during their first weeks of exogenous feeding were compared between the nearshore zone of a central Ontario lake and its small, inlet creeks. Food selection was related to size and age of charr and possibly availability of food items. Mean growth was similar between habitats despite differences in consumed food types and caloric values. Differences in social behaviour may have been responsible for different patterns of growth between habitats. The importance of creek habitats to the dynamics and fitness of lake populations of brook charr are suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000588
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  • 6
    Electronic Resource
    Electronic Resource
    Age and size-dependent variation in the seasonal timing and probability of reproduction among mature female pumpkinseed,Lepomis gibbosus (1994)
    Springer
    Environmental biology of fishes 39 (1994), S. 119-127 
    Details
    ISSN: 1573-5133
    Keywords: Body size ; Centrarchidae ; Life history ; Energy allocation ; Energetic deficits ; Sunfish
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis In this study, we used pumpkinseed,Lepomis gibbosus, populations in two east-central Ontario lakes to test for age and size-dependent effects on the probability and timing of reproduction of mature females. Pumpkinseed body size characteristics differed in the two lakes; Little Round Lake harbours a stunted population and Beloporine Lake does not. Age-class distribution of mature females was determined by a maturity assessment on fish collected just prior to spawning and at the mid-spawning period, combined with an early-season capture-mark-recapture survey. Spawning females were collected throughout the breeding season to assess age and size-related temporal trends, and to compare their age and size distribution with that of mature females at large. The proportion of age 2 females in Little Round Lake that actually spawned was considerably lower than the proportion of mature age 2 females at large. Furthermore, age 2 females that spawned in this lake did not do so until late in the breeding season. In contrast, the proportion of young/small females spawning in Beloporine Lake was comparable to the proportion of young/small mature females at large, and both small and large females spawned throughout the breeding season. Small mature females in Little Round Lake may have had no other option but to spawn late in the season because of their poor body condition. In Beloporine Lake, condition factor early in the breeding season in age 2–4 females was higher than that of Little Round Lake females, suggesting that limited energy reserves in the spring may have prevented young Little Round Lake females from early spawning. Our results show that the likelihood and timing of reproduction are both age and size-dependent in some populations. Small individuals that delay seasonal maturation and spawn late in the summer probably contribute little to the population due to the restricted growth and reduced overwinter survival of their progeny.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00004929
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  • 7
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    Factors influencing the recovery of submersed macrophytes in four coastal marshes of Lake Ontario (1998)
    Springer
    Details
    Publication Date: 1998-06-01
    Print ISSN: 0277-5212
    Electronic ISSN: 1943-6246
    Topics: Biology
    Published by Springer
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  • 8
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    Living a century in warm thermal conditions: introduced populations of Pumpkinseed (Lepomis gibbosus) inhabiting the Iberian Peninsula (Spain) show reduced adaptation to North American winter conditions (2014)
    Springer
    Details
    Publication Date: 2014-03-23
    Print ISSN: 1015-1621
    Electronic ISSN: 1420-9055
    Topics: Biology
    Published by Springer
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  • 9
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    Range expansion dynamics of the invasive round goby (Neogobius melanostomus) in a river system (2012)
    Springer
    Details
    Publication Date: 2012-02-02
    Print ISSN: 1386-2588
    Electronic ISSN: 1573-5125
    Topics: Biology
    Published by Springer
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  • 10
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    Occupation, body size and sex ratio of round goby (Neogobius melanostomus) in established and newly invaded areas of an Ontario river (2011)
    Springer
    Details
    Publication Date: 2011-04-17
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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