Rediscovery of a Relict Southern Population of Lake Chub, Couesius plumbeus, in Colorado

BackgroundThe Mountain Pygmy-possum (Burramys parvus) is a critically endangered marsupial, endemic to alpine regions of southern Australia. We investigated the diet of a recently discovered population of the possum in northern Kosciuszko National Park, NSW, Australia. This new population occurs at elevations well below the once-presumed lower elevation limit of 1,600 m.Goals and MethodsFaecal material was analysed to determine if dietary composition differed between individuals in the newly discovered northern population and those in the higher elevation southern population, and to examine how diet was influenced by rainfall in the southern population and seasonal changes in resource availability in the northern population.Results and DiscussionThe diet ofB. parvusin the northern population comprised of arthropods, fruits and seeds. Results indicate the diet of both populations shares most of the same invertebrate orders and plant species. However, in the absence of preferred food types available to the southern population, individuals of the northern population opportunistically consumed different species that were similar to those preferred by individuals in higher altitude populations. Differing rainfall amounts had a significant effect on diet, with years of below average rainfall having a greater percentage composition and diversity of invertebrates. Seasonal variation was also recorded, with the northern population increasing the diversity of invertebrates in their diet during the Autumn months when Bogong Moths (Agrotis infusa) were absent from those sites, raising questions about the possum’s dependence on the speciesConclusionsMeasurable effects of rainfall amount and seasonal variation on the dietary composition suggest that predicted climatic variability will have a significant impact on its diet, potentially impacting its future survival. Findings suggest that it is likely thatB. parvusis not restricted by dietary requirements to its current pattern of distribution. This new understanding needs to be considered when formulating future conservation strategies for this critically endangered species.

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Male parental investment reflects the level of partner contributions and brood value in tree swallows

10.1101/216119 ◽

2017 ◽

Author(s):

Ádám Z. Lendvai ◽

Çağlar Akçay ◽

Mark Stanback ◽

Mark F. Haussmann ◽

Ignacio T. Moore ◽

...

Keyword(s):

Parental Care ◽

Interesting Case ◽

Temporary Increase ◽

Southern Population ◽

Tree Swallows ◽

Parental Effort ◽

Northern Population ◽

Nestling Begging ◽

Two Populations ◽

Partial Compensation

AbstractBiparental care presents an interesting case of cooperation and conflict between unrelated individuals. Several models have been proposed to explain how parents should respond to changes in each other’s parental care to maximize their own fitness, predicting no change, partial compensation, or matching effort as a response. Here, we present an experiment in tree swallows (Tachycineta bicolor) in which we increased the parental care of females by presenting them, but not their mates, with additional nestling begging calls using automated playbacks. We performed this experiment in two populations differing in future breeding opportunities and thus the intensity of conflict over current parental care. We found that in response to a temporary increase in female parental effort, males in the northern population with lower sexual conflict matched the increased effort, whereas males in the southern population did not. We also found that increases in parental care during playbacks were driven by the females (i.e., females initiated the increased effort and their mates followed them) in the northern population but not the southern population. These results support the idea that with incomplete information about the brood value and need, cues or signals from the partner might become important in coordinating parental care.

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Spawning and fecundity of the western king prawn, Penaeus latisulcatus Kishinouye, in Western Australian Waters

Marine and Freshwater Research ◽

10.1071/mf9800021 ◽

1980 ◽

Vol 31 (1) ◽

pp. 21 ◽

Cited By ~ 46

Author(s):

JW Penn

Keyword(s):

Spawning Season ◽

Ovary Development ◽

Southern Population ◽

Spawning Frequency ◽

Total Length ◽

Australian Coastline ◽

The Individual ◽

Western Australian

The microscopic and macroscopic changes which occur during ovary development to spawning have been investigated for P. larisulcatus. The latter stages (3 and 4) of development and the act of spawning have been found to be confined to single intermoult periods, with spawning being possible during each of a series of consecutive intermoult periods. Fecundity was found to vary significantly with the size of the individual, with the number of eggs ranging from approximately 105000 (123 mm total length female) to 650000 (217 mm total length female) at each spawning. The use of an index of population fecundity in combination with estimates of spawning frequency to document spawning seasons is discussed. Using the population fecundity method the two northern populations have been shown to have a year round spawning season, with maximum spawning occurring from autumn to spring. while the southern population was shown to have shorter seasons over summer. A relationship between ovary development and temperatures in excess of 17�C is suggested as the probable cause of the differences in duration of spawning seasons along the Western Australian coastline.

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Occurrence of Lake Chub, Couesius plumbeus, in Northern Labrador

The Canadian Field-Naturalist ◽

10.22621/cfn.v124i2.1048 ◽

2010 ◽

Vol 124 (2) ◽

pp. 113 ◽

Cited By ~ 3

Author(s):

Wendy K. Michaud ◽

Robert C. Perry ◽

J. Brian Dempson ◽

Milton Shears ◽

Michael Power

Keyword(s):

Glacial Lake ◽

River Drainage ◽

Dispersal Routes ◽

George River ◽

Couesius Plumbeus

Lake Chub (Couesius plumbeus) were recently found in seven previously undocumented locations in northern Labrador. These populations represent the first recorded accounts of this species in the Labrador region north of the Churchill River drainage and east of the George River. Lake Chub likely invaded this region via dispersal routes provided by eastern spillways of glacial Lake Naskaupi.

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Effects of acclimation temperature on the thermal physiology in two geographically distinct populations of lake sturgeon (Acipenser fulvescens)

Conservation Physiology ◽

10.1093/conphys/coaa087 ◽

2020 ◽

Vol 8 (1) ◽

Author(s):

William S Bugg ◽

Gwangseok R Yoon ◽

Alexandra N Schoen ◽

Andrew Laluk ◽

Catherine Brandt ◽

...

Keyword(s):

Glutathione Peroxidase ◽

Mrna Expression ◽

Cellular Response ◽

Abiotic Factors ◽

Lake Sturgeon ◽

Hepatosomatic Index ◽

Acclimation Temperature ◽

Acipenser Fulvescens ◽

Southern Population ◽

Thermal Plasticity

Abstract Temperature is one of the most important abiotic factors regulating development and biological processes in ectotherms. By 2050, climate change may result in temperature increases of 2.1–3.4°C in Manitoba, Canada. Lake sturgeon, Acipenser fulvescens, from both northern and southern populations in Manitoba were acclimated to 16, 20 and 24°C for 30 days, after which critical thermal maximum (CTmax) trials were conducted to investigate their thermal plasticity. We also examined the effects of temperature on morphological and physiological indices. Acclimation temperature significantly influenced the CTmax, body mass, hepatosomatic index, metabolic rate and the mRNA expression of transcripts involved in the cellular response to heat shock and hypoxia (HSP70, HSP90a, HSP90b, HIF-1α) in the gill of lake sturgeon. Population significantly affected the above phenotypes, as well as the mRNA expression of Na+/K+ ATPase-α1 and the hepatic glutathione peroxidase enzyme activity. The southern population had an average CTmax that was 0.71 and 0.45°C higher than the northern population at 20 and 24°C, respectively. Immediately following CTmax trials, mRNA expression of HSP90a and HIF-1α was positively correlated with individual CTmax of lake sturgeon across acclimation treatments and populations (r = 0.7, r = 0.62, respectively; P < 0.0001). Lake sturgeon acclimated to 20 and 24°C had decreased hepatosomatic indices (93 and 244% reduction, respectively; P < 0.0001) and metabolic suppression (27.7 and 42.1% reduction, respectively; P < 0.05) when compared to sturgeon acclimated to 16°C, regardless of population. Glutathione peroxidase activity and mRNA expression Na+/K+ ATPase-α1 were elevated in the northern relative to the southern population. Acclimation to 24°C also induced mortality in both populations when compared to sturgeon acclimated to 16 and 20°C. Thus, increased temperatures have wide-ranging population-specific physiological consequences for lake sturgeon across biological levels of organization.

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Larval stages of the lake chub, Couesius plumbeus

Canadian Journal of Zoology ◽

10.1139/z81-036 ◽

1981 ◽

Vol 59 (2) ◽

pp. 218-224 ◽

Cited By ~ 1

Author(s):

Lee A. Fuiman ◽

Joan P. Baker

Keyword(s):

External Morphology ◽

Caudal Peduncle ◽

Larval Stages ◽

Rhinichthys Cataractae ◽

Couesius Plumbeus

Three collections of Couesius plumbeus eggs were laboratory reared. Larvae were described with emphasis on external morphology. They were characterized by (1) 25 to 30 preanal myomeres, (2) a diagonal row of melanophores across the surface of the breast, and (3) a concentration of melanophores on the distal hypaxial portion of the caudal peduncle. Larval characteristics were compared with those of its breeding associate Rhinichthys cataractae and other sympatic cyprinids which have similarly high preanal myomere counts.

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OCCURRENCE AND IMPLICATIONS OF DOUBLE BROODING IN A SOUTHERN POPULATION OF TREE SWALLOWS

The Condor ◽

10.1525/cond.2008.8341 ◽

2008 ◽

Vol 110 (2) ◽

pp. 382-386 ◽

Cited By ~ 14

Author(s):

ADRIAN P. MONROE ◽

KELLY K. HALLINGER ◽

REBECKA L. BRASSO ◽

DANIEL A. CRISTOL

Keyword(s):

Southern Population ◽

Tree Swallows ◽

Double Brooding

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Some Myxosporidia found in certain freshwater fishes water fishes in Quebec province, Canada

Parasitology ◽

10.1017/s0031182000012634 ◽

1939 ◽

Vol 31 (1) ◽

pp. 1-77 ◽

Cited By ~ 44

Author(s):

H. B. Fantham ◽

Annie Porter ◽

L. R. Richardson

Keyword(s):

Fresh Water ◽

Economic Importance ◽

Fresh Water Fish ◽

Ecological Research ◽

Host Fish ◽

Water Fish ◽

Rivers And Lakes ◽

The Many ◽

Couesius Plumbeus ◽

Rich Fauna

The Province of Quebec provides a magnificent field for fresh-water faunistic and ecological research on account of its numerous rivers and lakes. Investigations in ecology and ecological parasitology by the authors have revealed a rich fauna in the areas described herein.Examinations of fourteen species of fresh-water fish have produced twenty-eight species of Myxosporidia, of which twenty-five are new and three have been already described. The existence of races or strains or varieties of some of the forms is demonstrated.Descriptions and illustrations are given of twenty-eight Myxosporidia found by the authors in fresh-water fishes of Quebec Province. The new species include: Sphaerospora notropis, Myxidium percae, Zschokkella salvelini, Myxosoma notropis, M. commersonii, M. orbitalis, M. pfrille, M. media, M. ellipticoides, M. parellipticoides, Myxobolus poecilichthidis, M. dentium, M. percae, M. rhinichthidis, M. notropis, M. catostomi, M. couesii, M. hybo-rhynchi, M. subcircularis, M. transversalis, M. grandis, Henneguya fontinalis, H. fontinalis var. notropis, H. percae, H. salmonis and H. esocis. Myxosoma catostomi Kudo, Myxobolus conspicuus Kudo and M. ovoidalis Fantham are described from Canadian fishes. Details are given of a series of races, strains or varieties of Thelohanellus notatus Mavor, of Myxobolus catostomi, of M. notropis and of Henneguya fontinalis from other than the original host fish.The pathology of the myxosporidian infections from the many different situations in the hosts is discussed. Unusual sites of infection are the palatine teeth of Esox maskinongy with Myxobolus dentium and the iris of the eye of Couesius plumbeus with Myxobolus couesii.In connexion with the economic importance of the Myxosporidia found in Quebec fishes, the destruction of young fish, alteration of the character of the fauna dependent on the same, human food supply, possible epizootics in hatcheries and possible cross-infection of game fishes and other fishes of economic importance are considered. The immediate danger is not great; it is the future that may be imperilled.

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