Body size and reproductive allocation in a multiple spawning centrarchid

1998 ◽  
Vol 55 (3) ◽  
pp. 737-748 ◽  
Author(s):  
Michael G Fox ◽  
Alain J Crivelli
Keyword(s):  
Body Size ◽  
Reproductive Output ◽  
Reproductive Allocation ◽  
Lepomis Gibbosus ◽  
Variable Environment ◽  
Native Canadian ◽  
Multiple Spawning ◽  
Canadian Population ◽  
Native Populations ◽  
Spawning Periods

Reproductive allocation in the multiple-spawning pumpkinseed (Lepomis gibbosus) was estimated in two non-native populations in southern France and one native Canadian population with experiments conducted in artificial enclosures, supplemented with data collected from wild populations. Reproductive allocation, estimated as the sum of mass lost over weeks when fish spawned, averaged 24 and 27% of prespawning body mass in the two French populations and 11.5% in the Canadian population. Estimates generated from a bioenergetics model and from batch fecundity in field-caught females gave similar results. Females from the French populations averaged 2.9 and 3.1 spawning periods, whereas the Ontario females averaged 2.1 spawning periods over a shorter spawning season. Body size was weakly correlated with reproductive allocation in one French and one Canadian population. The level of reproductive allocation in pumpkinseeds is considerably lower than that estimated in other multiple-spawning fishes. We suggest that multiple spawning can evolve solely to allocate the production of young in a variable environment and not necessarily to increase the total reproductive output of the female.

An ecological explanation for hyperallometric scaling of reproduction

2021 ◽  
Author(s):  
Tomos Potter ◽  
Anja Felmy
Keyword(s):  
Body Size ◽  
Reproductive Output ◽  
Resource Competition ◽  
Natural Populations ◽  
Scaling Exponent ◽  
Wild Populations ◽  
Wet Season ◽  
Size Dependent ◽  
In The Wild ◽  
The Relationship

AbstractIn wild populations, large individuals have disproportionately higher reproductive output than smaller individuals. We suggest an ecological explanation for this observation: asymmetry within populations in rates of resource assimilation, where greater assimilation causes both increased reproduction and body size. We assessed how the relationship between size and reproduction differs between wild and lab-reared Trinidadian guppies. We show that (i) reproduction increased disproportionately with body size in the wild but not in the lab, where effects of resource competition were eliminated; (ii) in the wild, the scaling exponent was greatest during the wet season, when resource competition is strongest; and (iii) detection of hyperallometric scaling of reproduction is inevitable if individual differences in assimilation are ignored. We propose that variation among individuals in assimilation – caused by size-dependent resource competition, niche expansion, and chance – can explain patterns of hyperallometric scaling of reproduction in natural populations.

Female and male costs of reproduction must be equal in dioecious Cape plant genus Leucadendron (Proteaceae)

2019 ◽  
Vol 67 (7) ◽  
pp. 517
Author(s):  
Jeremy J. Midgley ◽  
Adam G. West ◽  
Michael D. Cramer
Keyword(s):  
Sexual Dimorphism ◽  
Reproductive Output ◽  
Sex Ratios ◽  
Reproductive Allocation ◽  
Costs Of Reproduction ◽  
Male And Female

The Cape Leucadendron genus is dioecious, with extreme vegetative dimorphism displayed in some species – females having much larger leaves and fewer branches than males – whereas other species are monomorphic. Leucadendron is ecologically diverse, with some species with canopy stored seeds (serotiny) and others with soil stored seeds. These features mean that the Cape Leucadendron is an ideal genus to study the costs of reproduction for the different sexes in plants, and to determine whether vegetative dimorphism could be due to unequal costs. Here we use the unique aspects of the fire-prone Cape environment in which leucadendrons occur to show that the costs of sex must be equal between the sexes. Leucadendron populations are single aged because they only recruit after fires that kill all adults. Therefore, because the sexes have the same lifespans, they must have the same lifetime extent of vegetative versus reproductive allocation. Also, ecologically similar hermaphrodite Proteaceae co-exist with dioecious taxa. To co-occur, dioecious and hermaphrodite taxa must have the same mean post-fire fitness. This implies that dioecious females must have double the reproductive output that a co-occurring hermaphrodite has. This is only possible if the costs of reproduction are the same for the sexes and that the sexes use the same resources for reproduction. Finally, because males and female co-occur, they must be competitively equivalent to maintain natal sex ratios. These three factors suggest male and female allocate equivalently and therefore that vegetative sexual dimorphism is unlikely to be due to differences in allocation.

Is reproductive allocation in Senecio vulgaris plastic?

Botany ◽  
2009 ◽  
Vol 87 (5) ◽  
pp. 475-481 ◽  
Author(s):  
Jacob Weiner ◽  
Lars Rosenmeier ◽  
Emma Soy Massoni ◽  
Josep Nogués Vera ◽  
Eva Hernández Plaza ◽  
...  
Keyword(s):  
Reproductive Output ◽  
Plant Biomass ◽  
Seed Mass ◽  
Plant Size ◽  
Reproductive Allocation ◽  
Life Cycles ◽  
Nutrient Level ◽  
Significant Shift ◽  
Senecio Vulgaris ◽  
The Relationship

Several purported cases of plasticity in plant allocation patterns appear to be the effects of size and allometric growth (“apparent plasticity”). To ask whether there is true plasticity (i.e., a change in the allometric trajectory) in reproductive allocation in Senecio vulgaris  L., we grew S. vulgaris plants at high and low levels of water, nutrients, and competition, and analyzed the relationship between vegetative and seed biomass. Plant size was the major determinant of reproductive output, accounting for 83% of the variation in log (seed mass). There were also significant effects of the treatments that were not due to size, accounting for an additional 9% of the variation. The treatments affected the allometric coefficient (intercept), not the allometric exponent (slope) of the relationship, reflecting a small but significant shift in the efficiency of conversion of total plant biomass into reproductive biomass. In a second experiment, we grew S. vulgaris plants at three nutrient levels and allowed all individuals to complete their life cycles. Again, nutrient level had a small but significant effect on the allometric coefficient. Plasticity in reproductive allocation exists, but is very limited. The primary effects of the environment on the reproductive output of S. vulgaris occur via plant size.

scholarly journals Reproduction of a South American population of pumpkinseed sunfish Lepomis gibbosus (Linnaeus) (Osteichthyes, Centrarchidae): a comparison with the European and North American populations

2005 ◽  
Vol 22 (2) ◽  
pp. 477-483 ◽  
Author(s):  
André L. B. de Magalhães ◽  
Thiago F. Ratton
Keyword(s):  
Gonadosomatic Index ◽  
Brazilian Population ◽  
Lepomis Gibbosus ◽  
South American ◽  
South American Population ◽  
Multiple Spawning ◽  
Pumpkinseed Sunfish ◽  
Introduced Populations ◽  
Egg Diameter ◽  
Made In

The reproductive biology of the introduced pumpkinseed sunfish Lepomis gibbosus (Linnaeus, 1758) in the Custódio's Dam, rio Doce high basin, state of Minas Gerais, Brazil was studied from February/2001 to March/2002 and compared with introduced and native populations. Reproduction occurred almost along the entire period of study with a high frequency of fishes in the advanced ripening/mature and spawned/spent stages. The microscopic analyses indicated that the pumpkinseed sunfish presents multiple spawning. The egg diameter of the Brazilian population is similar to the Spanish, Greek and American ones. The standard length at maturity and the gonadosomatic index of the introduced populations are smaller when compared with native ones. The spawning season of the Brazilian population was the longest among all comparisons made in the present work.

Habitat-Related Variation in Body Size and Reproductive Output and an Examination of Reproductive Allometry in the Sabine Map Turtle (Graptemys sabinensis) across Three River Drainages

Copeia ◽  
2016 ◽  
Vol 104 (2) ◽  
pp. 458-468 ◽  
Author(s):  
Amy K. Fehrenbach ◽  
Irvin Louque ◽  
Stacy L. McFadden ◽  
Cybil Huntzinger ◽  
Eddie Lyons ◽  
...  
Keyword(s):  
Body Size ◽  
Reproductive Output ◽  
Related Variation ◽  
River Drainages

Relationship of the metabolic rate of excised gill tissue to body size in two species of sunfish

1971 ◽  
Vol 49 (3) ◽  
pp. 373-375 ◽  
Author(s):  
James O'Hara
Keyword(s):  
Body Size ◽  
Metabolic Rate ◽  
Lepomis Macrochirus ◽  
Volume Ratio ◽  
Gill Tissue ◽  
Lepomis Gibbosus ◽  
Small Fish ◽  
Relationship Of ◽  
Intrinsic Muscles ◽  
Reduced Surface

The respiration rate of excised gill tissue from Lepomis macrochirus and Lepomis gibbosus was lowest in small fish and increased with body size to a stable maximum in larger fish. It is suggested that this relationship is due to size-associated changes in development of intrinsic muscles of the gills which compensates for the reduced surface-to-volume ratio of the gill tissue in larger fish.

Sign in / Sign up

Export Citation Format

Share Document