Feeding chronology and habits of Alosa spp. (Clupeidae) juveniles from the lower Hudson River estuary, New York

Grabe, Stephen A.

doi:10.1007/bf00000504

Cited by 14 publications

(9 citation statements)

References 9 publications

(4 reference statements)

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“…For this analysis to be applicable, we must assume that there was no emigration from or immigration into the region (rkm 104-109). This appears to be reasonable because common prey for age-0 American shad (i.e., zooplankton and macroinvertebrates; Crecco and Blake 1983;Grabe 1996) had a NURSERY HABITAT USE BY AMERICAN SHAD d 13 C value similar to the estimated R f (À31.8%; Table 1), implying that age-0 fish were at isotopic equilibrium in this region. The average d 13 C (SD) estimated from sampling at rkm 109 (27 May, 30 June, and 21 July) was À32.2% (0.8) for Eurytemora affinis (a calanoid copepod), À32.6% (1.2) for Bosmina freyi (a cladoceran), and À32.4% (1.7) for Chironomus spp.…”

Section: Model Application To Juvenile American Shadmentioning

confidence: 69%

Tracking Nursery Habitat Use in the York River Estuary, Virginia, by Young American Shad Using Stable Isotopes

Hoffman¹,

Bronk²,

Olney³

2007

Trans Am Fish Soc

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We developed and applied a stable isotope turnover model to estimate how long age‐0 American shad Alosa sapidissima reside within tidal freshwater and brackish‐water habitats in the York River estuary, Virginia. The residence time was estimated by modeling the changing stable isotope ratio (either the carbon [δ13C] or sulfur [δ34S] stable isotope ratio) of an age‐0 American shad as it migrates seaward from its present habitat to a new habitat and determining the minimum time required to acquire the isotopic signature of its new habitat. A sensitivity analysis of our turnover model indicates that the results are robust at relatively fast turnover rates, such as those experienced by young fish, but that at slow turnover rates the model can yield biologically meaningful differences with relatively small changes in variables. The average ± SE isotopic ratios for the dorsal muscle tissue of age‐0 fish increased along the estuary, from −31.8 ± 0.3‰ for δ13C and −5.2 ± 0.7‰ for δ34S at the farthest upriver region to −21.8 ± 1.2‰ for δ13C and 10.3 ± 1.7‰ for δ34S in the lower estuary, and were significantly different among regions. To account for these distinct signatures along the estuary, the turnover model predicts that age‐0 fish remain in discrete regions (∼10 river kilometers) of the tidal freshwater portion of the river for at least 15‐45 d and in the lower estuary for at least 32‐66 d. Juveniles, therefore, are spatially segregated, and probably migrate slowly downstream during the summer and early fall, accumulating in the lower freshwater and oligohaline portions of the estuary before their oceanic migration.

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Section: Model Application To Juvenile American Shadmentioning

confidence: 69%

Tracking Nursery Habitat Use in the York River Estuary, Virginia, by Young American Shad Using Stable Isotopes

Hoffman¹,

Bronk²,

Olney³

2007

Trans Am Fish Soc

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“…The TS range (<−42 dB) also suggests that many of the fish targets we detected in the middle estuary throughout the year were young of year fish potentially using this area as a nursery (e.g., Rudstam et al 2003;Gurshin 2012). Diadromous fish using northeastern U.S. estuaries for juvenile rearing has been noted in other systems (Grabe 1996) and is also likely to be important in the Penobscot estuary (e.g., MDMR and MDIFW 2009). The temporal difference in distribution between surveys depending on season and the observed variability in TS is expected when the difference is caused by an influx of diadromous fish into the system.…”

mentioning

confidence: 63%

Using Hydroacoustics to Describe Pelagic Fish Distribution in the Penobscot Estuary, Maine

et al. 2017

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Temperate estuaries are inherently variable and productive ecosystems that provide nursery habitat, migration pathways, and forage areas for diadromous, estuarine, and marine fish. We used multifrequency scientific echo sounders (SIMRAD EK60 split‐beam, 38 and 120 kHz) to describe the distribution of pelagic fish in the Penobscot River estuary, Maine, in 2012 and 2013. Differences in responses between frequencies were used to distinguish fish from other biota. Acoustic area backscatter from echo integration (sA [m2/nautical mile2], a common measure proportional to fish density) and target strength (TS; dB re 1 m2, an acoustic measure of fish size) distributions varied with season and salinity. Overall, the sA and TS distributions were similar in both years, with detectable spatial and temporal patterns. The highest value of sA occurred in July of both years, when dense schools of fish were detected in higher‐salinity areas of the lower estuary. The middle estuary had high sA values in April both years, particularly in the vicinity of the seawater–freshwater interface. The mixing area in the middle estuary stratum appears to be important fish habitat; we found fish in this area throughout the year. Fish of variable TS were using this mixing zone throughout the survey period. In full freshwater, upstream from the salinity mixing area, sA was generally low. The majority (~77%) of discrete fish detected had TS values less than −42 dB. The TS distributions varied seasonally, with the highest TS measurements occurring more frequently in April and May and the lowest ones occurring most frequently in July and August. This study demonstrates the efficacy of using a mobile hydroacoustic survey to assess pelagic fish distribution in a complex estuary and may provide a template for long‐term monitoring in dynamic estuarine ecosystems. Received November 3, 2016; accepted March 15, 2017 Published online June 20, 2017

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“…and Leptodora kindtii were common. These taxa were almost never identified in stomach contents of Hudson River alosines (Limburg and Strayer 1988;Grabe 1996) and are rare in the Hudson River (Malone 1977;Pace et al 1992;Limburg et al 1997). In ensuing years, feeding blueback herring collected in the Mohawk River consumed primarily larval and adult aquatic insects.…”

Section: Resultsmentioning

confidence: 99%

“…The freshwater feeding behavior of juvenile blueback herring has been studied extensively in both reservoirs and river systems, and their planktivorous behavior in these systems is well documented (Ivlev 1961;Davis and Cheek 1967;Burbidge 1974;Weaver 1975;Janssen 1982;Crecco and Blake 1983;Limburg and Strayer 1988;Grabe 1996;Walsh et al 2005). Distribution, growth, and feeding of juveniles has been related to standing crops of zooplankton (Burbidge 1974), but there is little mention of benthic macroinvertebrates as prey.…”

Section: Cdd Classmentioning

confidence: 99%

Bridging the Energy Gap: Anadromous Blueback Herring Feeding in the Hudson and Mohawk Rivers, New York

2007

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Adult blueback herring Alosa aestivalis (N ¼ 116) were collected during the 1999, 2000, and 2002-2004 spawning runs from sites on the Hudson and Mohawk rivers, and gut contents were analyzed. Thirty-four fish (33% of those examined) were found to contain food material. Food items were present in 41% of Mohawk River samples and 11% of Hudson River samples; all Hudson River fish containing food were captured in small tributaries above the head of tide. Hudson River fish predominantly consumed zooplankton, while Mohawk River fish consumed benthic aquatic insects in large quantities, including Baetidae, Ephemeridae, and Chironomidae. Using stable isotope analysis and a mixing model, we found that fish collected later in the season had significantly decreased marine-derived C. Condition indices of later-season fish were equal to or greater than those of fish collected earlier in the season. Blueback herring in this system may face increased energy requirements as they migrate farther upstream during spawning runs, and feeding may provide energy subsidies needed to maintain fitness over their expanded migratory range.

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Feeding chronology and habits of Alosa spp. (Clupeidae) juveniles from the lower Hudson River estuary, New York

Cited by 14 publications

References 9 publications

Tracking Nursery Habitat Use in the York River Estuary, Virginia, by Young American Shad Using Stable Isotopes

Tracking Nursery Habitat Use in the York River Estuary, Virginia, by Young American Shad Using Stable Isotopes

Using Hydroacoustics to Describe Pelagic Fish Distribution in the Penobscot Estuary, Maine

Bridging the Energy Gap: Anadromous Blueback Herring Feeding in the Hudson and Mohawk Rivers, New York

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