Planktivory by alewife (<i>Alosa pseudoharengus</i>) and rainbow smelt (<i>Osmerus mordax</i>) on microcrustacean zooplankton and dreissenid (Bivalvia: Dreissenidae) veligers in southern Lake Ontario

Mills, Edward L.; O’Gorman, Robert; Roseman, Edward F.; Adams, Connie M.; Owens, Randall W.

doi:10.1139/f95-092

Cited by 44 publications

(14 citation statements)

References 30 publications

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“…Although D. polymorpha has been intensively investigated for over a century (Schloesser et al, 1994), only 10 European and 5 North American fish species were found to feed on its planktonic larvae, and reported FO and biomass values of D. polymorpha larvae in the diets of these species are usually lower than those found in our study (e.g., Mills et al, 1995;Molloy et al, 1997). The moderate trophic impact of D. polymorpha veligers on other members of the ecosystem was recently confirmed by stable isotopic studies in estuarine waters (Barnard et al, 2006).…”

Section: Discussioncontrasting

confidence: 73%

Larvae of the invasive species Limnoperna fortunei (Bivalvia) in the diet of fish larvae in the Paraná River, Argentina

et al. 2007

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To assess the trophic impact of the planktonic larvae of the invasive Asian bivalve Limnoperna fortunei, introduced in South America around 1990, we investigated the gut contents of fish larvae collected at monthly intervals between October 2000 and March 2001 at three locations along a 600 km stretch of the Paraná River, and during November 2004 in two areas of marginal lagoons connected to the river near the city of San Nicolá s, Argentina. Zooplankton was also collected in the lagoons in 2004. In total, 11,956 fish larvae were retrieved, of which 1,511 were used for detailed analyses. Of the 15 fish taxa collected, 11 had veligers of L. fortunei in their gut. Fish larvae with empty guts represented 60% (San Nicolá s) to 72% (Paraná River) of the total number of fish. Proportions of feeding fish larvae with L. fortunei veligers in their guts varied between 20% (San Nicolá s) and 56% (Paraná River); in 15% of the guts analyzed, L. fortunei was the only food item recorded. For those specimens that had consumed L. fortunei larvae and any other food item, L. fortunei was the most important item in 55% (Paraná River) to 71% (San Nicolá s) of the animals in terms of biomass. No major temporal or spatial changes in the diet were observed along the Paraná River, but the relative biomass contribution of L. fortunei larvae differed strongly in fishes of different developmental stage. In protolarvae and mesolarvae, veligers accounted for 30-35% of the gut contents. In metalarvae, veligers accounted for only 3%, indicating enhanced food supply for the earliest fish life stages. Comparison of the relative proportions of the three main zooplankton types (L. fortunei veligers, cladocerans, and copepods) in the water and in larval fish guts indicates that L. fortunei is always selected positively over the other two prey types. While our results strongly suggest that the expansion of L. fortunei results in an enhanced food supply for local fish populations, they do not necessarily imply that Handling editor: S. M. Thomaz the overall effect on the ecosystem in general, and on the fish fauna in particular is beneficial.

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Section: Discussioncontrasting

confidence: 73%

Larvae of the invasive species Limnoperna fortunei (Bivalvia) in the diet of fish larvae in the Paraná River, Argentina

et al. 2007

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“…Comparisons with D. polymorpha suggest that its much shorter reproductive period (Nichols 1996) may be among the reasons for its considerably lower presence in the diet of North American fish species. According to Mills et al (1995), only two North American fish species feed on D. polymorpha larvae (as opposed to at least 11 species recorded to feed on L. fortune larvae in South America; Paolucci et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Prey selection by larvae of Prochilodus lineatus (Pisces: Curimatidae): indigenous zooplankton versus veligers of the introduced bivalve Limnoperna fortunei (Bivalvia: Mitilidae)

2009

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We studied experimentally the feeding selectivity of larvae of Prochilodus lineatus (Pisces), with particular emphasis on the role of veligers of the exotic bivalve Limnoperna fortunei. Three concentrations of veligers were offered to three developmental stages of P. lineatus. Veliger concentrations were: (1) higher than in the field (''enriched'', 0.09 ind. ml -1 ), (2) unmodified from field conditions (''normal'', 0.06 ind. ml -1 ), and (3) lower than in the field (''low'', 0.02 ind. ml -1 ). Fish developmental stages were protolarvae (approx. 10 days old), mesolarvae (17 days), and metalarvae (25 days). Proportions (in terms of numbers and biomass) and selectivity values were calculated for each prey item evaluated: veligers, small cladocerans ? nauplii, medium-sized cladocerans, copepodits, and large cladocerans ? copepods. Protolarvae and mesolarvae consumed veligers almost exclusively (88-90%, both in numbers and in biomass) when offered prey enriched in veligers, whereas for metalarvae veligers represented only 16.0% of the food consumed. At lower veliger concentrations, only protolarvae preferred Limnoperna veligers, whereas older fishes switched gradually to crustacean plankton. We conclude that veligers are preferred by the early fish developmental stages, and we speculate that this may be because their slower swimming makes them easier to capture than planktonic crustaceans. However, as fish larvae grow larger, veligers become too small a prey for their energetic needs, and they switch to larger items like cladocerans and copepods. We anticipate that this new and abundant food resource has an important impact on the survival and growth of P. lineatus.

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“…Note that the decrease in Wsh catch was related to a drop in commercial Wshing following the reuniWcation of Germany in 1989/1990; however, stocking of Wsh was also reduced at the same time, pointing to a probable stable Wsh abundance on a lower level at the beginning of the 1990s. Mills et al (1995) showed that, in years when planktivorous Wsh were abundant and larvae sparse, planktivorous Wsh could substantially reduce larval numbers in a fairly short period. Therefore, it is likely that improved food composition and/or a probable decrease in Wsh abundance have enhanced conditions for survival of large larvae within the years of cluster D.…”

Section: Discussionmentioning

confidence: 99%

Long-term response of Dreissena polymorpha larvae to physical and biological forcing in a shallow lake

Wilhelm

Adrian

2006

Oecologia

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Müggelsee, a shallow eutrophic lake (Berlin, Germany), has been subject to global warming and concurrent reductions of anthropogenic nutrient loading during the past decades. Here, we focus on the recent increase in abundance of Dreissena polymorpha larvae. We aimed at ascertaining whether the change in abundance of larvae was driven by changes in climate, especially by climate warming, and/or by the concurrent changes in trophic state of the lake. Both the numbers of small, newly developed larvae and their lengths have increased in recent years, suggesting that conditions for overall reproductive success have improved. The timing of the increase in abundance of larvae was matched by changes in nutrient loading and phytoplankton biomass, induced by a reduced inflow of nutrients into the lake. Besides a correlation between the first appearance of larvae each year and the timing of the requisite temperature for first spawning (12 degrees C), no relationship between changes in water temperature and abundance, length and survival rates of larvae was found. However, a sudden drop in abundance of larvae in 2003 may be primarily attributed to low dissolved oxygen conditions during an unusually long period of stratification, induced by anomalous meteorological conditions. The increase in length and survival rates of larvae was most likely due to changes in food composition, which followed the decrease in nutrient availability, and to changes in the occurrence of planktivorous fish. The results suggest that the first appearance of larvae per year and the decline in abundance of larvae in 2003 were driven by climatic influences, while the overall increase in abundance and length of D. polymorpha larvae in Müggelsee was more likely caused by changes in the trophic state of the lake rather than by climate warming.

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Planktivory by alewife (Alosa pseudoharengus) and rainbow smelt (Osmerus mordax) on microcrustacean zooplankton and dreissenid (Bivalvia: Dreissenidae) veligers in southern Lake Ontario

Cited by 44 publications

References 30 publications

Larvae of the invasive species Limnoperna fortunei (Bivalvia) in the diet of fish larvae in the Paraná River, Argentina

Larvae of the invasive species Limnoperna fortunei (Bivalvia) in the diet of fish larvae in the Paraná River, Argentina

Prey selection by larvae of Prochilodus lineatus (Pisces: Curimatidae): indigenous zooplankton versus veligers of the introduced bivalve Limnoperna fortunei (Bivalvia: Mitilidae)

Long-term response of Dreissena polymorpha larvae to physical and biological forcing in a shallow lake

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