Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Life-history trade-offs among four sympatric seabreams

Life-history trade-offs among four sympatric seabreams Fish life history is shaped by environmental and ecological circumstances but constrained by phylogeny. Life-history trade-offs can be exposed in a comparison of closely related species with similar niches. We compare the life histories of four closely related and similar-sized, sympatric, omnivorous seabreams (Sparidae) that share the same physical habitat, namely the steentjie Spondyliosoma emarginatum, hottentot Pachymetopon blochii, white stumpnose Rhabdosargus globiceps and Fransmadam Boopsoidea inornata. Samples of each species were obtained in every season from the southwestern Cape, South Africa, to obtain measures of length, mass, gonadosomatic index (GSI) and condition. Large variations in sex ratio, GSI, and spawning season length (SSL) among species are described. Differences in patterns of sex-specific GSI and condition point to different mating systems. Spondyliosoma emarginatum is a nest-guarding, short-lived, protogynous hermaphrodite. Pachymetopon blochii is a resident group-spawner. Rhabdosargus globiceps is a moderately long-lived migrant group-spawner, with a sex ratio closest to 1:1. Boopsoidea inornata is a polygamous, long-lived resident with low annual fecundity. Trade-offs are apparent between annual fecundity and longevity, parental care and male GSI, parental care and SSL, migration and SSL, hermaphroditism and migration, and hermaphroditism and bet-hedging. The cost of sequential hermaphroditism in marine fish is considered in terms of reproductive success in highly variable environments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png African Journal of Marine Science Taylor & Francis

Life-history trade-offs among four sympatric seabreams

African Journal of Marine Science , Volume 42 (3): 15 – Oct 1, 2020

Life-history trade-offs among four sympatric seabreams

Abstract

Fish life history is shaped by environmental and ecological circumstances but constrained by phylogeny. Life-history trade-offs can be exposed in a comparison of closely related species with similar niches. We compare the life histories of four closely related and similar-sized, sympatric, omnivorous seabreams (Sparidae) that share the same physical habitat, namely the steentjie Spondyliosoma emarginatum, hottentot Pachymetopon blochii, white stumpnose Rhabdosargus globiceps and Fransmadam...
Loading next page...
 
/lp/taylor-francis/life-history-trade-offs-among-four-sympatric-seabreams-BJ20755v1O
Publisher
Taylor & Francis
Copyright
© 2020 NISC (Pty) Ltd
ISSN
1814-2338
eISSN
1814-232X
DOI
10.2989/1814232X.2020.1794957
Publisher site
See Article on Publisher Site

Abstract

Fish life history is shaped by environmental and ecological circumstances but constrained by phylogeny. Life-history trade-offs can be exposed in a comparison of closely related species with similar niches. We compare the life histories of four closely related and similar-sized, sympatric, omnivorous seabreams (Sparidae) that share the same physical habitat, namely the steentjie Spondyliosoma emarginatum, hottentot Pachymetopon blochii, white stumpnose Rhabdosargus globiceps and Fransmadam Boopsoidea inornata. Samples of each species were obtained in every season from the southwestern Cape, South Africa, to obtain measures of length, mass, gonadosomatic index (GSI) and condition. Large variations in sex ratio, GSI, and spawning season length (SSL) among species are described. Differences in patterns of sex-specific GSI and condition point to different mating systems. Spondyliosoma emarginatum is a nest-guarding, short-lived, protogynous hermaphrodite. Pachymetopon blochii is a resident group-spawner. Rhabdosargus globiceps is a moderately long-lived migrant group-spawner, with a sex ratio closest to 1:1. Boopsoidea inornata is a polygamous, long-lived resident with low annual fecundity. Trade-offs are apparent between annual fecundity and longevity, parental care and male GSI, parental care and SSL, migration and SSL, hermaphroditism and migration, and hermaphroditism and bet-hedging. The cost of sequential hermaphroditism in marine fish is considered in terms of reproductive success in highly variable environments.

Journal

African Journal of Marine ScienceTaylor & Francis

Published: Oct 1, 2020

Keywords: Boopsoidea inornata; fecundity; longevity; mating system; Pachymetopon blochii; Rhabdosargus globiceps; sequential hermaphroditism; Spondyliosoma emarginatum

References