Comparative Life History Tactics of the Sphaeriid Clam, Musculium partumeium (Say), from a Permanent and a Temporary Pond

1980 ◽  
Vol 104 (2) ◽  
pp. 319 ◽  
Author(s):  
C. M. Way ◽  
Daniel J. Hornbach ◽  
Albert J. Burky
Keyword(s):  
2021 ◽  
Vol 8 (2) ◽  
pp. 120-130
Author(s):  
Imane Halassi ◽  
Ali Elafri ◽  
Ismahan Halassi ◽  
Hichem Amari ◽  
Moussa Houhamdi

Laboratory observations on rearing experiment of Odonata serve to answer many evolutionary and ecological questions. In order to evidences the role of species parental habitat provenience in the development behaviour of their offspring, we surveyed several life history traits of two rearing populations of Sympetrum meridionale (Anisoptera: Sympetrinae), coming from two different habitats across north-eastern Algeria. The first one is a RAMSAR wetland called ‘Mekhada’ (a perennial water body), and the second one is a temporary pond located at “Maouna” Mountain (1400 m altitude). Overall, the development patterns of the two populations of dragonflies vary with the type of habitat the parental generation of the species occupy (Factorial ANCOVA: all p < 0.05). Firstly, egg mortality was very low in dragonfly population inhabiting the RAMSAR wetland compared of those belonging to Maouna Mountain. Secondly new-borne larvae stemming from females inhabiting the Mekhada wetland develop more slowly than did those coming from the “Maouna” Mountain pond. Finally, larvae of Sympetrum meridionale stemming from females inhabiting the temporary wetland were heavier than those inhabiting the perennial wetland. Such studies will ads considerably to our understanding of the mechanisms that are responsible for possible effects of environmental changes on life history traits of dragonflies across the southern part of their distribution range.


1981 ◽  
Vol 59 (12) ◽  
pp. 2219-2229 ◽  
Author(s):  
P. M. McKee ◽  
G. L. Mackie

Life histories of the fingernail clams Sphaerium occidentale and Musculium securis from a temporary pond are examined to show adaptations to ephemeral habitats. Musculium securis ceases growth upon birth and only newborn occur in the dry pond, whereas all length classes of S. occidentale are omnipresent. Aestivation is not obligatory in the life cycle of either species. Both grow and reproduce regardless of aestivation experience.Life history strategies of both clams counteract environmentally imposed, density-independent mortality pressures. Sphaerium occidentale has slower growth and greater longevity than M. securis which must complete its life cycle before the pond dries. During aestivation, broods continue development in S. occidentale but not in M. securis. If water is present in fall, both opportunistically use this period for development. Both produce large numbers of small newborn and exhibit multivoltine and iteroparous strategies, although M. securis releases consecutive broods only during a single spring birth period and only if the aquatic season is extended, whereas S. occidentale releases consecutive broods during a spring birth period, in autumn if water is present, and during a 2nd year. A mixed tactic, according to the stochastic theory, has been adopted by both for survival under highly variable environmental stresses.


2022 ◽  
Vol 82 ◽  
Author(s):  
E. E. Cortez-Silva ◽  
V. F. Souza ◽  
G. S. Santos ◽  
E. M. Eskinazi-Sant’Anna

Abstract Cladocerans are a diverse group of species that show rapid responses to changes in environmental conditions. This adaptive capacity has important implications for egg production and life cycle, especially in transitory environments such as temporary waterbodies. The present study investigated the life history and egg production of Alona gutatta Sars, 1862 (Crustacea, Cladocera), an abundant and frequent species from a high-altitude temporary pond (Lagoa Seca, Minas Gerais, Brazil). Newly hatched neonates were monitored in relation to time of maturation, number of eggs produced per female and time of survival. Neonates required a mean of 8 days to mature. A. guttata survived for a mean of 30.9 ± 8.1 days and produced 2 eggs per brood, generating a mean of 10.95 ± 6.41 neonates during the entire life cycle. The rapid development, short time to produce eggs and long life cycle are important adaptations to the adverse environmental conditions of temporary aquatic environments, which can contribute to the rapid colonization of Alona guttata in transitory ecosystems.


Chemosphere ◽  
2021 ◽  
pp. 132823
Author(s):  
Yusuph A. Kafula ◽  
Charlotte Philippe ◽  
Tom Pinceel ◽  
Linus K. Munishi ◽  
Francis Moyo ◽  
...  
Keyword(s):  

2019 ◽  
Vol 42 ◽  
Author(s):  
Boris Kotchoubey

Abstract Life History Theory (LHT) predicts a monotonous relationship between affluence and the rate of innovations and strong correlations within a cluster of behavioral features. Although both predictions can be true in specific cases, they are incorrect in general. Therefore, the author's explanations may be right, but they do not prove LHT and cannot be generalized to other apparently similar processes.


Sarsia ◽  
2003 ◽  
Vol 88 (4) ◽  
pp. 297-301 ◽  
Author(s):  
Guerra A. ◽  
Rocha F. ◽  
A. F. González
Keyword(s):  

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