Allometric length‐weight relationships for benthic prey of aquatic wildlife in coastal marine habitats

McKinney, Richard A.; Glatt, Sarah M.; Williams, Scott R.

doi:10.2981/wlb.2004.029

Cited by 50 publications

(29 citation statements)

References 39 publications

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“…Assuming that 1 ml O 2 equals 20.1 J [26], we converted the measured oxygen values (ml O 2 s 21 ) to energetic equivalents (J s -1 ). To account for the significant amount of metabolically inert body mass for the crab, prawn, seastar and gastropod species, soft tissue body masses were derived from measured wet weights using published relationships for these species [27][28][29].…”

Section: Methodsmentioning

confidence: 99%

Idiosyncratic species effects confound size-based predictions of responses to climate change

Twomey

Brodte

Jacob³

et al. 2012

Phil. Trans. R. Soc. B

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Understanding and predicting the consequences of warming for complex ecosystems and indeed individual species remains a major ecological challenge. Here, we investigated the effect of increased seawater temperatures on the metabolic and consumption rates of five distinct marine species. The experimental species reflected different trophic positions within a typical benthic East Atlantic food web, and included a herbivorous gastropod, a scavenging decapod, a predatory echinoderm, a decapod and a benthic-feeding fish. We examined the metabolism -body mass and consumption -body mass scaling for each species, and assessed changes in their consumption efficiencies. Our results indicate that body mass and temperature effects on metabolism were inconsistent across species and that some species were unable to meet metabolic demand at higher temperatures, thus highlighting the vulnerability of individual species to warming. While body size explains a large proportion of the variation in species' physiological responses to warming, it is clear that idiosyncratic species responses, irrespective of body size, complicate predictions of population and ecosystem level response to future scenarios of climate change.

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Section: Methodsmentioning

confidence: 99%

Idiosyncratic species effects confound size-based predictions of responses to climate change

Twomey

Brodte

Jacob³

et al. 2012

Phil. Trans. R. Soc. B

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“…Thus, bias in energetic carrying capacity estimates resulting from core samples treated with H 2 O 2 may vary according the proportion of soft-bodied invertebrates in samples, which varies by habitats of waterbirds (e.g., moist-soil wetlands, mudflats; Osborn 2015). Significant bias may exist if biomass estimates are based on wet masses and alternative methods (e.g., length-weight models) may be better suited to estimate biomass from soft-bodied invertebrates exposed for long periods to H 2 O 2 (McKinney et al 2004). Scientists should avoid using H 2 O 2 for long-exposure times or adjust biomass estimates accordingly if biomass estimates are based on wet mass.…”

Section: Discussionmentioning

confidence: 99%

“…Aquatic invertebrates are used as food by waterbirds throughout their annual cycle and are particularly important during spring migration, feather molt, and the breeding season as a source of protein, lipids, and essential amino acids (Bellrose 1980;Loesch and Kaminski 1989;Richardson and Kaminski 1992;Anderson et al 2000;McKinney et al 2004). Often, scientists include aquatic invertebrate biomass with seeds, tubers, and other plant materials in estimates of food density that are used to determine energetic carrying capacity for waterbirds.…”

Section: Introductionmentioning

confidence: 99%

Effects of Hydrogen Peroxide as a Core Sample Processing Solvent on Invertebrate Biomass

Hagy

McKnight

2016

Journal of Fish and Wildlife Management

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Scientists estimate biomass of invertebrates to evaluate wetland management practices, estimate energetic carrying capacity for wildlife, assess habitat condition and disturbance, and quantify ecosystem services. For waterfowl and other waterbirds in North America, carrying capacity in migratory and wintering regions is estimated using food density, of which invertebrates can be a significant component. However, we are not aware of previous literature that has described the effects of reagents used during core sample processing on invertebrate biomass and abundance. We tested the effects of hydrogen peroxide on aquatic invertebrates to determine whether a reagent used to disassociate soils during core sample processing biased estimates of biomass and abundance. Wet masses of chironomid larvae were less (x ¼ 23.5% loss) in samples exposed to hydrogen peroxide than those exposed only to tap water and biomass decreased approximately 2.9% with each minute of exposure time. Dry mass of larvae was less in samples exposed to hydrogen peroxide than in those exposed only to tap water (x ¼ 2.5% loss), but we did not detect an effect of exposure time on mass lost. Hydrogen peroxide did not influence the abundance of macro-or microinvertebrates in test samples. Thus, bias associated with dry mass estimates of invertebrates from core samples treated with hydrogen peroxide is likely minimal in terms of application in energetic carrying capacity models. However, use of hydrogen peroxide during core sample processing may cause significant bias if biomass estimates are based on wet mass.

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“…Schult found enough taxa so that we could do a species-level station-to-station ttest comparing the Providence River station with the North Jamestown reference station. Data from the waterfowl feeding study included 28 stations throughout the Bay (2.0 mm sieve; 30 species of macrofauna reported; McKinney et al, 2004;R. McKinney, unpublished data) and had adequate sample size to do a t-test on stations in each area.…”

Section: Biomass and Secondary Productionmentioning

confidence: 99%

Eutrophication and Hypoxia Diminish Ecosystem Functions of Benthic Communities in a New England Estuary

2016

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Excessive input of nitrogen to estuaries and coastal waters leads to eutrophication; the resulting organic matter over-enrichment of sediments and seasonal hypoxia of bottom water have significant deleterious effects on benthic community biodiversity, abundance, and biomass. Our goal was to better understand how these losses carry through to impairment of key ecosystem functions of benthic communities. Recent management efforts to address eutrophication have reduced nitrogen loading to several estuaries of the Virginian Biogeographic Province (northeast United States). How the ecosystems will respond remains to be seen. Using Narragansett Bay as an example estuary within this Province, we compared measures of community structure and function from stations in seasonally hypoxic areas with stations in normoxic areas. We analyzed a benthic data set spanning 20 years and 155 stations, along with ancillary data from other sources. Hypoxic areas had half the species richness, many fewer rare species, lower biomass, and lower secondary production. Benthic communities in the hypoxic areas had a significantly different abundance structure, were at an earlier successional stage, and bioturbated the sediments to a depth about one-fifth that of the normoxic areas. On average, sediments in the hypoxic areas took up more oxygen-used for aerobic metabolism and oxidation of reduced compounds from anaerobic metabolism. Sediments in hypoxic areas released into the overlying water two to three times more ammonium and phosphate. Mean flux of dissolved oxygen into the sediments of hypoxic areas and mean net flux of nitrogen gas (from sediment denitrification) out were slightly higher. Eutrophication-driven over-enrichment of organic matter, along with seasonal hypoxia in the northern part of the Bay have led to degradation of benthic community structure and function, which have serious implications for sustainable provision of ecosystem services. We quantified fifteen stressor-response relationships that can help understand how, following a reduction in nitrogen inputs, a recovery of benthic ecosystem functions in hypoxic areas could proceed.

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Allometric length‐weight relationships for benthic prey of aquatic wildlife in coastal marine habitats

Cited by 50 publications

References 39 publications

Idiosyncratic species effects confound size-based predictions of responses to climate change

Idiosyncratic species effects confound size-based predictions of responses to climate change

Effects of Hydrogen Peroxide as a Core Sample Processing Solvent on Invertebrate Biomass

Eutrophication and Hypoxia Diminish Ecosystem Functions of Benthic Communities in a New England Estuary

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