Comparisons of the feeding activity and diets of male and female cunners Tautogolabrus adspersus (Pisces: Labridae)

Green, J. M.; Martel, Guy; Martin, D. W.

doi:10.1007/bf00394521

Cited by 35 publications

(20 citation statements)

References 25 publications

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“…There were no clear trends in the abundance of these predators, or of scavenging whelks, hermit crabs and scale worms, following the sea urchin die-off. Predatory fish such as wolffish Anarhichas lupus and cunner Tautogolabrus adspersus, which are important consumers of mussels, sea urchins and other small invertebrates elsewhere in eastern Canada and the Gulf of Maine (Edwards et al 1982, Green et al 1984, Witman 1985, Johnson & Mann 1986, Keats et al 1986, were rare or absent throughout the study. Oeniqad pue p861 qsiew uaaMlaq PPaH a16e3 le paq alqqos aql uo ae6leoiz1eru para 10 mqrunu sapads pue (,_W 1 q 6 1 a~ h p 6) sseluotq (sasaqlua~ed ur) uo~le~nap piepuels pue ueaw 'l x!puaddy…”

Section: Discussionmentioning

confidence: 99%

Community dynamics on a subtidal cobble bed following mass mortalities of sea urchins

Scheibling¹,

Raymond²

1990

Mar. Ecol. Prog. Ser.

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The macrobenthic community of a shallow subtidal cobble bed at Eagle Head on the Atlantic coast of Nova Scotia was monitored from ca 4 mo before to 41 mo after mass mortalities of sea urchins Strongylocentrotus droebachiensis in September 1983. Biomass of erect algae on cobbles increased from 0 to between 50 and 75 g (dry weight) m-' after the sea urchin die-off, and consisted mainly of small and sparsely distributed plants of Fucus evanescens and Chondrus crispus. In contrast, algal biomass increased from 0 to ca 2.8 kg m-2 on an adjacent boulder ridge where large kelps (Laminaria longicruris, L. digitata, Saccorhiza dermatodea) formed a dense canopy. The macroflora of cobble beds at 2 other sites was similar in biomass and con~position to the cobble bed at Eagle Head. At a third site, the sea urch~n population had recovered and precluded the establishment of non-calcareous algae on the cobbles. In the absence of sea urchins, herbivorous molluscs, mainly perwinkles Littorina littorea, limpets Notoacmaea testudinalis and chitons Tonicella rubra, dominated the cobble macrofauna, reaching densities of up to ca 150, 400, and 1300 ind. m-2 respectively at Eagle head. However, these grazers (and other organisms) suffered mass mortalities in summer 1986, when thick mats of drift algae inundated the bottom creating anoxic conditions. Suspension feeders consisted mainly of small bivalves of which juvenile mussels (Modiolis modiolis, Myllis edulis) were most abundant. Predators/ scavengers included crabs, lobsters, whelks, sea stars, and polychaetes, many of which were small and seasonally active. With the exception of juvenile mussels, which increased in abundance (but rarely reached adult size), there was no evidence of a numerical response among macrofaunal populations to the elimination of sea urchins.

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Section: Discussionmentioning

confidence: 99%

Community dynamics on a subtidal cobble bed following mass mortalities of sea urchins

Scheibling¹,

Raymond²

1990

Mar. Ecol. Prog. Ser.

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“…Hence even a female which spawns several times in a day spends a relatively short period in reproductive activities and is able to spend almost all of her time foraging. Female cunners also differ from territorial males in the amounts and kinds of food items they ingest (Green et al 1984), apparently ingesting higher energy but less abundant or evenly dispersed prey than territorial males.…”

Section: Discussionmentioning

confidence: 99%

“…If w e assume that each feeding attempt yields on average the same caloric return, our data indicate that males are not restricting the amount of their foraging activity during the spawning season, but rather are shifting the timing of that activity. Based on the number of feeding bouts (not significantly different throughout the seasons), territorial males have fixed energy requirements, which points towards a timeminimizing strategy (Schoener 1971, Green et al 1984. Female cunners, unlike territorial males, forage throughout the day during the spawning season (Green et al 1984).…”

Section: Discussionmentioning

confidence: 99%

“…Based on the number of feeding bouts (not significantly different throughout the seasons), territorial males have fixed energy requirements, which points towards a timeminimizing strategy (Schoener 1971, Green et al 1984. Female cunners, unlike territorial males, forage throughout the day during the spawning season (Green et al 1984). Females have been observed to spawn more than once per day, but the average courtship-spawning sequence requires less than 4 min (Pottle & Green 1979a).…”

Section: Discussionmentioning

confidence: 99%

“…Cunners feed mainly on benthic organisms (Chao 1973, Olla et al 1975, Green et al 1984. and territorial males sustain themselves from food in their territories.…”

Section: Introductionmentioning

confidence: 99%

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Foraging time allocation in a territorial fish: influence of reproductive activities

Green¹,

Martel²,

Kingsland³

1985

Mar. Ecol. Prog. Ser.

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Individual territorial male cunners Tautogolabrus adspersus were observed in the morning and afternoon during pre-spawning, spawning, and post-spawning seasons in Conception Bay, Newfoundland. Male cunners appear to feed at a constant rate throughout all seasons, but they shift their foraging to the morning during the spawning season such that feeding does not conflict with spawning which occurs only in the afternoon. This is viewed as a true optimal foraging strategy, fitness rather than energy intake being the currency maximized (Sih 1982).

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Feeding Interactions between Fishes in a Coastal Ecosystem in the Southern Gulf of St. Lawrence, Atlantic Canada

Hanson

2018

Trans Am Fish Soc

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Diet composition, diet similarity, and major predator–prey interactions between the 15 most abundant demersal and pelagic fishes (N = 12,163 stomachs) during the period 1999–2003 were described for Northumberland Strait, a semi‐enclosed, marine coastal ecosystem. Of the five pelagic species, Rainbow Smelt Osmerus mordax ate benthic prey (shrimps and polychaetes); Atlantic Herring Clupea harengus and American Shad Alosa sapidissima consumed small copepods and crab zoeae; and Atlantic Mackerel Scomber scombrus and Alewives Alosa pseudoharengus ate small copepods and moderate amounts of benthic prey and small fishes. Three demersal species were strongly piscivorous but with minimal diet overlap: Sea Ravens Hemitripterus americanus consumed small benthic fishes (especially flounders); Winter Skate Leucoraja ocellata consumed sand lances Ammodytes sp. and Rainbow Smelt; and White Hake Urophycis tenuis consumed Atlantic Herring and Atlantic Mackerel. Cluster analysis revealed seven feeding guilds, of which four contained a single species; consequently, the potential for compensation of predatory function was nonexistent for these guilds. The three multispecies guilds comprised consumers of (1) small copepods and crab zoeae; (2) small benthic invertebrates and polychaetes; and (3) shrimps and crabs. Based on diets, the principal route of energy transfer seemed to be the benthic–detrital pathway; however, confirmation requires representative abundance estimates for the various fishes. Moreover, abundances of many fish species have changed (i.e., most have decreased) since this study was completed, with unknown consequences for food web structure and functioning.

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Comparisons of the feeding activity and diets of male and female cunners Tautogolabrus adspersus (Pisces: Labridae)

Cited by 35 publications

References 25 publications

Community dynamics on a subtidal cobble bed following mass mortalities of sea urchins

Community dynamics on a subtidal cobble bed following mass mortalities of sea urchins

Foraging time allocation in a territorial fish: influence of reproductive activities

Feeding Interactions between Fishes in a Coastal Ecosystem in the Southern Gulf of St. Lawrence, Atlantic Canada

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