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Título: | Alternative reproductive tactics and inverse size‑assortment in a high‑density fish spawning aggregation |
Autor: | Karkarey, Rucha; Zambre, Amod; Isvaran, Kavita; Arthur, Rohan CSIC ORCID | Palabras clave: | Inverse size-assortment Squaretail grouper Spawning aggregation High mating density Alternative reproductive tactics Shoal and pair courtship tactics |
Fecha de publicación: | 2017 | Editor: | BioMed Central | Citación: | BMC Ecology 17 : 10 (2017) | Resumen: | Background: At high densities, terrestrial and marine species often employ alternate reproductive tactics (ARTs) to maximize reproductive benefits. We describe ARTs in a high-density and unfished spawning aggregation of the squaretail grouper (Plectropomus areolatus) in Lakshadweep, India. Results: As previously reported for this species, territorial males engage in pair-courtship, which is associated with a pair-spawning tactic. Here, we document a previously unreported school-courtship tactic; where territorial males court multiple females in mid-water schools, which appears to culminate in a unique ‘school-spawning’ tactic. Courtship tactics were conditional on body size, local mate density and habitat, likely associated with changing trade-offs between potential mating opportunities and intra-sexual competition. Counter-intuitively, the aggregation showed a habitat-specific inverse size-assortment: large males courted small females on the reef slope while small males courted equal-sized or larger females on the shelf. These patterns remained stable across two years of observation at high, unfished densities. Conclusions: These unique density-dependent behaviours may disappear from this aggregation as overall densities decline due to increasing commercial fishing pressure, with potentially large consequences for demographics and fitness. | Descripción: | Este artículo contiene 13 páginas, 3 tablas, 4 figuras. | Versión del editor: | http://dx.doi.org/10.1186/s12898-017-0120-5 | URI: | http://hdl.handle.net/10261/146565 | DOI: | 10.1186/s12898-017-0120-5 | ISSN: | 1472-6785 |
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