Life history variation across latitudes: observations between capelin (Mallotus villosus) from Newfoundland and the eastern Canadian Arctic

McNicholl, Darcy; Davoren, Gail K.; Reist, James D.

doi:10.1007/s00300-017-2225-x

Cited by 9 publications

(6 citation statements)

References 42 publications

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“…Capelin spawn between ages 2 and 5 (McNicholl et al. ), which is consistent with the age range observed in Norton Sound (Table ). However, there was a higher proportion of older Capelin in Norton Sound during 2018 (Figure B) than during 1981 (Pahlke ).…”

Section: Discussionsupporting

confidence: 84%

“…; McNicholl et al. ), yet latitude could not explain differences in fish lengths between populations in Newfoundland (53.1°N); Togiak Bay, Alaska (59.0°N); and Norton Sound (63.8°N). Although it is unclear why these size differences existed, they may reflect interannual variations in size structure and growth among cohorts within the same population (Hedeholm et al.…”

Section: Discussionmentioning

confidence: 94%

“…; McNicholl et al. ). Our results indicate that fundamental ecological aspects of Capelin spawning are similar in multiple marine ecosystems across the species’ geographic range.…”

Section: Discussionmentioning

confidence: 99%

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Distribution and Life History of Spawning Capelin in Subarctic Alaska

2019

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Capelin Mallotus villosus is a coldwater, marine forage fish that responds quickly to environmental fluctuations; however, little is known about Capelin in Alaskan waters. The objective of the current study was to better understand the distribution and life history of spawning Capelin in northern Norton Sound, Alaska. Surveys were conducted from May through July 2018 to locate and estimate the size of nearshore Capelin aggregations prior to spawning, identify the location and timing of spawning events, characterize spawning habitat, and collect actively spawning fish to examine life history characteristics (e.g., body size, age, fecundity, etc.). Most (85.9%) of the nearshore aggregations were less than 12 m 2 in surface area. Spawning Capelin were collected in Norton Sound between June 15 and June 21. At spawning locations, gravel and coarse sand accounted for over 70% of the proportional weight of sediment collected within a beach, and all sediment samples contained Capelin eggs. Spawning males were larger than spawning females in TL (mean ± SD = 148.8 ± 6.7 mm versus 137.0 ± 8.4 mm, respectively) and total weight (21.2 ± 2.9 g versus 13.7 ± 3.0 g), and both sexes were predominately age 3 (age range = 2-4 years). Absolute fecundity was 9,219 ± 4,529 eggs, and the gonadosomatic index was 1.09 ± 0.32% for males and 21.69 ± 8.21% for females. Nearshore aggregation sizes in Norton Sound were smaller than those reported for Newfoundland, but spawning behavior, timing, and water conditions were similar to observations from other Capelin spawning regions (e.g., Greenland), as were size, age, fecundity, and gonadosomatic index estimates. Although the results from the current study update baseline information on spawning Capelin in northern Norton Sound, continued research on their distribution and life history is needed to better understand ecosystem function in the North Pacific Ocean.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 94%

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Distribution and Life History of Spawning Capelin in Subarctic Alaska

2019

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“…Total niche areas (dashed lines SEA b ) for each period and standard ellipses incorporating 40% of data corrected for small sample size (SEA c , solid ellipses) for male and female narwhals are indicated. capelin over the past 35 years (Boertmann & Mosbech, 2017;Gaston & Elliott, 2014;McNicholl et al, 2018;Provencher et al, 2012), and this question requires verification using additional diet measures (e.g., stomach contents) or proxies (e.g., fatty acid analysis). Watt et al, 2013;capelin, Dennard et al, 2009;squid, Watt & Ferguson, 2015), corrected for trophic discrimination by adding 3.6‰ and 3.7‰ to δ 15 N and δ 13 C, respectively (Szpak et al, 2012), and plotted against isotopic values of whales.…”

Section: Discussionmentioning

confidence: 99%

“…Changes in the physical environment have led to biological changes, such as altered nutrient cycling and subsequent shifts in phytoplankton biomass and community composition (Blais et al, 2017; Li et al, 2009). Promoted by both biological (phytoplankton community) and environmental (warming conditions) changes, subarctic fish species, such as capelin ( Mallotus villosus ), have become more abundant in Cumberland Sound, which is adjacent to the Baffin Bay narwhal winter range (McNicholl et al, 2018). Similar shifts in fish communities may be expected at higher latitudes within Baffin Bay and Davis Strait given increasing phytoplankton productivity and decreasing abundance of Arctic zooplankton species have been reported in areas of Baffin Bay (Krawczyk et al, 2021; Møller & Nielsen, 2020).…”

Section: Introductionmentioning

confidence: 99%

Isotopic (δ¹⁵N and δ¹³C) profiles in dentine indicate sex differences and individual variability in resource use among narwhals (Monodon monoceros)

Zhao

Davoren

Matthews

et al. 2022

Marine Mammal Science

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While the impact of ecological changes on Arctic marine mammals remains largely unknown, quantifying variability in resource use among conspecifics can serve as an indication of adaptive plasticity and help assess species vulnerability to climate-induced changes. We measured withintooth δ 15 N and δ 13 C profiles of narwhals (Monodon monoceros) sampled 35 years apart from Baffin Bay, Nunavut, Canada, to evaluate intrapopulation variation in narwhal resource use. Narwhal dentine δ 15 N and δ 13 C were lower post-1983 (n = 7) by 0.83‰ and 0.52‰, respectively, compared to pre-1983 (n = 13), but isotopic niche breadth increased from 0.95‰ 2 to 1.12‰ 2 . Between sexes, the isotopic niche of males expanded from pre-1983 to post-1983 while that of females decreased, which may indicate increased flexibility in resource use for males and the opposite for females. Additional isotopic variation among narwhals (n = 23) suggests individual differences in diet composition and/or foraging location during both periods.Individual isotopic niches ranged between 0.08‰ 2 and 2.27‰ 2 , where a larger isotopic niche likely indicates more variable foraging strategies over time. Narwhal as a species is considered vulnerable to ecosystem change; however, the variability in resource use between sexes and among

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Diet and isotopic niche overlap elucidate competition potential between seasonally sympatric phocids in the Canadian Arctic

et al. 2019

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Life history variation across latitudes: observations between capelin (Mallotus villosus) from Newfoundland and the eastern Canadian Arctic

Cited by 9 publications

References 42 publications

Distribution and Life History of Spawning Capelin in Subarctic Alaska

Distribution and Life History of Spawning Capelin in Subarctic Alaska

Isotopic (δ¹⁵N and δ¹³C) profiles in dentine indicate sex differences and individual variability in resource use among narwhals (Monodon monoceros)

Diet and isotopic niche overlap elucidate competition potential between seasonally sympatric phocids in the Canadian Arctic

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Life history variation across latitudes: observations between capelin (Mallotus villosus) from Newfoundland and the eastern Canadian Arctic

Cited by 9 publications

References 42 publications

Distribution and Life History of Spawning Capelin in Subarctic Alaska

Distribution and Life History of Spawning Capelin in Subarctic Alaska

Isotopic (δ15N and δ13C) profiles in dentine indicate sex differences and individual variability in resource use among narwhals (Monodon monoceros)

Diet and isotopic niche overlap elucidate competition potential between seasonally sympatric phocids in the Canadian Arctic

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Resources

About

Isotopic (δ¹⁵N and δ¹³C) profiles in dentine indicate sex differences and individual variability in resource use among narwhals (Monodon monoceros)