Reflections on the Evolution of Piscine Viviparity

Wourms, John P.; Lombardi, Julian

doi:10.1093/icb/32.2.276

Cited by 216 publications

(228 citation statements)

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“…We used a simple binary categorisation of reproductive mode into lecithotrophy and matrotrophy, which does not account for variation in the degree of maternal investment among species (Wourms and Lombardi 1992). One way of measuring the degree of relative investment in offspring is to consider the relative mass increase between ovum and neonate size.…”

Section: Life-history Strategies and Relative Investmentmentioning

confidence: 99%

Does more maternal investment mean a larger brain? Evolutionary relationships between reproductive mode and brain size in chondrichthyans

Mull

Yopak

Dulvy

2011

Mar. Freshwater Res.

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Abstract. Chondrichthyans have the most diverse array of reproductive strategies of any vertebrate group, ranging from egg-laying to live-bearing with placental matrotrophy. Matrotrophy is defined as additional maternal provisioning beyond the yolk to the developing neonate; in chondrichthyans, this occurs through a range of mechanisms including uterine milk, oophagy, uterine cannibalism and placentotrophy. Chondrichthyans also exhibit a wide range of relative brain sizes and highly diverse patterns of brain organisation. Brains are energetically expensive to produce and maintain, and represent a major energetic constraint during early life in vertebrates. In mammals, more direct maternal-fetal placental connections have been associated with larger brains (steeper brain-body allometric scaling relationships). We test for a relationship between reproductive mode and relative brain size across 85 species from six major orders of chondrichthyans by using several phylogenetic comparative analyses. Ordinary least-squares (OLS) and reduced major axis (RMA) regression of body mass versus brain mass suggest that increased maternal investment results in a larger relative brain size. Our findings were supported by phylogenetic generalised least-squares models (pGLS), which also highlighted that these results vary with evolutionary tempo, as described by different branch-length assumptions. Across all analyses, maximum body size had a significant influence on the relative brain size, with large-bodied species (body mass .100 kg) having relatively smaller brains. The present study suggests that there may be a link between reproductive investment and relative brain size in chondrichthyans; however, a more definitive test requires a better-resolved phylogeny and a more nuanced categorisation of the level of maternal investment in chondrichthyans.

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Section: Life-history Strategies and Relative Investmentmentioning

confidence: 99%

Does more maternal investment mean a larger brain? Evolutionary relationships between reproductive mode and brain size in chondrichthyans

Mull

Yopak

Dulvy

2011

Mar. Freshwater Res.

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“…Reproduction within the genus Scorpaena is characterised by external fertilisation and production of eggs that are embedded in a gelatinous matrix (Wourms and Lombardi 1992;Koya and Muñoz 2007;McMillan 2007). Findings from the present study suggest that S. cardinalis has a similar reproductive strategy.…”

Section: Reproductionmentioning

confidence: 99%

“…Reproduction within the genus Scorpaena has previously been described as highly specialised, with the oviparous species examined (S. porcus, S. guttata, S. miostoma and S. notata) producing floating gelatinous egg masses (Koya and Muñoz 2007). This reproductive mode is thought to represent a shift from a primitive to specialised mode of oviparity (Wourms and Lombardi 1992) and has been used to infer evolution within the larger family Scorpaenidae (Koya and Muñoz 2007).…”

Section: Introductionmentioning

confidence: 99%

Life-history traits of the southern hemisphere eastern red scorpionfish, Scorpaena cardinalis (Scorpaenidae: Scorpaeninae)

Stewart

Hughes

2010

Mar. Freshwater Res.

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Abstract. Fishes of the family Scorpaenidae (scorpionfish/rockfish) are important to benthic rocky-reef communities and fisheries globally. The present study is the first to provide biological information for any species of the genus Scorpaena (Scorpaena cardinalis) in southern hemisphere waters, namely south-eastern Australia. Growth of S. cardinalis was estimated using size-at-age data from sectioned otoliths. Growth was slow, with fish attaining ,22 cm after 5 years and 26 cm after 10 years. The oldest fish sampled was estimated to be 33 years old. In contrast to similar-sized congeneric species, males increased in length significantly faster and attained larger sizes than females. Variable recruitment patterns were evident from the age composition of the sampled population. Males of S. cardinalis had mean gonadosomatic index levels (0.09%) an order of magnitude smaller than did the females (2.8-4%) during the March spawning peak. S. cardinalis possesses a cystovarian Type II-3 ovary, a highly specialised form associated with external fertilisation and the production of eggs in a floating gelatinous mass. Traits such as slow growth, substantial longevity, variable recruitment patterns and a highly specialised reproductive strategy may make this species vulnerable to over-exploitation as has occurred with other members of the family Scorpaenidae elsewhere.

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“…The main disadvantage of internal embryonic development is the increased costs of reproduction per individual offspring for the female. Females suffer reduced fecundity and might even face higher predation pressure due to lower mobility during pregnancy 40,41 . In coelacanths, the benefits of live-bearing seem to compensate the large disadvantages to the female.…”

Section: Discussionmentioning

confidence: 99%

Single-male paternity in coelacanths

Lampert¹,

Blassmann

Hissmann

et al. 2013

Nat Commun

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Latimeria chalumnae, a 'living fossil,' is of great scientific interest, as it is closely related to the aquatic ancestors of land-living tetrapods. Latimeria show internal fertilization and bear live young, but their reproductive behaviour is poorly known. Here we present for the first time a paternity analysis of the only available material from gravid females and their offspring. We genotype two L. chalumnae females and their unborn brood for 14 microsatellite loci. We find that the embryos are closely related to each other and never show more than three different alleles per locus, providing evidence for a single father siring all of the offspring. We reconstruct the father's genotype but cannot identify it in the population. These data suggest that coelacanths have a monogamous mating system and that individual relatedness is not important for mate choice.

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Reflections on the Evolution of Piscine Viviparity

Cited by 216 publications

References 0 publications

Does more maternal investment mean a larger brain? Evolutionary relationships between reproductive mode and brain size in chondrichthyans

Does more maternal investment mean a larger brain? Evolutionary relationships between reproductive mode and brain size in chondrichthyans

Life-history traits of the southern hemisphere eastern red scorpionfish, Scorpaena cardinalis (Scorpaenidae: Scorpaeninae)

Single-male paternity in coelacanths

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