Brood care in Brachyuran crabs: the effect of oxygen provision on reproductive costs

The quantification of the costs associated with parental care of marine invertebrates requires a first and necessary step, which is the identification of the different forms of care exhibited by this group. Among marine invertebrates, provision of oxygen to the aggregation of embryos may be critical...

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Autores principales:	FERNÁNDEZ,MIRIAM, BRANTE,ANTONIO
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2003
Materias:	reproduction brood care crabs oxygen marine invertebrates
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000200003
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spelling	oai:scielo:S0716-078X20030002000032003-10-09Brood care in Brachyuran crabs: the effect of oxygen provision on reproductive costsFERNÁNDEZ,MIRIAMBRANTE,ANTONIO reproduction brood care crabs oxygen marine invertebrates The quantification of the costs associated with parental care of marine invertebrates requires a first and necessary step, which is the identification of the different forms of care exhibited by this group. Among marine invertebrates, provision of oxygen to the aggregation of embryos may be critical, although most evidence on the link between oxygen limitation and parental care is indirect. Species which show active behavior directed at providing oxygen to the brood offer a good model to establish the direct link between behavioural patterns and oxygen provision to the embryos, and to estimate the costs associated with this form of care. In this manuscript, we conducted a review of the current knowledge about oxygen limitation in embryos aggregations of marine invertebrates in general and Brachyuran crabs in particular. Most of the emphasis focuses on recent results on Brachyuran crabs and new information on Ovalipes trimaculatus. The consequences of oxygen limitation on investment in reproduction and clutch size determination are analyzed. Temporal patterns of oxygen availability in the center of embryo masses of Brachyuran crabs are different from other brooding species of marine invertebrates. A cyclic pattern in oxygen partial pressure (PO2) was detected in masses of early stage embryos, and constant, high PO2 in females carrying late stage embryos, for all crab species studied so far. As changes in PO2 in the embryo mass occurred, an increase in oxygen demand by the embryos and an increase in abdominal flapping frequency were detected in all species. Moreover, the rate of increase in the frequency of abdominal flapping between females carrying early and late stage embryos varied among species, depending on oxygen consumption rate of the embryos. In spite of this, embryos of all species experience similar oxygen conditions throughout development. Abdominal flapping seems to be the main behavior used to provide oxygen to the embryos, regardless of the habitat types inhabited by brooding females. Recent studies have shown that ovigerous female crabs consume a substantially higher amount of oxygen than non-brooding females, and suggested that there may be a trade-off between investment in eggs and in ventilation of the embryos. This information supports the need for including the cost of oxygen provision in the estimation of maternal effort. A broad range of possible areas of research are proposed to advance in this direction, concentrating either on marine invertebrates in general, or Brachyuran crabs in particularinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.76 n.2 20032003-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000200003en10.4067/S0716-078X2003000200003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	reproduction brood care crabs oxygen marine invertebrates
spellingShingle	reproduction brood care crabs oxygen marine invertebrates FERNÁNDEZ,MIRIAM BRANTE,ANTONIO Brood care in Brachyuran crabs: the effect of oxygen provision on reproductive costs
description	The quantification of the costs associated with parental care of marine invertebrates requires a first and necessary step, which is the identification of the different forms of care exhibited by this group. Among marine invertebrates, provision of oxygen to the aggregation of embryos may be critical, although most evidence on the link between oxygen limitation and parental care is indirect. Species which show active behavior directed at providing oxygen to the brood offer a good model to establish the direct link between behavioural patterns and oxygen provision to the embryos, and to estimate the costs associated with this form of care. In this manuscript, we conducted a review of the current knowledge about oxygen limitation in embryos aggregations of marine invertebrates in general and Brachyuran crabs in particular. Most of the emphasis focuses on recent results on Brachyuran crabs and new information on Ovalipes trimaculatus. The consequences of oxygen limitation on investment in reproduction and clutch size determination are analyzed. Temporal patterns of oxygen availability in the center of embryo masses of Brachyuran crabs are different from other brooding species of marine invertebrates. A cyclic pattern in oxygen partial pressure (PO2) was detected in masses of early stage embryos, and constant, high PO2 in females carrying late stage embryos, for all crab species studied so far. As changes in PO2 in the embryo mass occurred, an increase in oxygen demand by the embryos and an increase in abdominal flapping frequency were detected in all species. Moreover, the rate of increase in the frequency of abdominal flapping between females carrying early and late stage embryos varied among species, depending on oxygen consumption rate of the embryos. In spite of this, embryos of all species experience similar oxygen conditions throughout development. Abdominal flapping seems to be the main behavior used to provide oxygen to the embryos, regardless of the habitat types inhabited by brooding females. Recent studies have shown that ovigerous female crabs consume a substantially higher amount of oxygen than non-brooding females, and suggested that there may be a trade-off between investment in eggs and in ventilation of the embryos. This information supports the need for including the cost of oxygen provision in the estimation of maternal effort. A broad range of possible areas of research are proposed to advance in this direction, concentrating either on marine invertebrates in general, or Brachyuran crabs in particular
author	FERNÁNDEZ,MIRIAM BRANTE,ANTONIO
author_facet	FERNÁNDEZ,MIRIAM BRANTE,ANTONIO
author_sort	FERNÁNDEZ,MIRIAM
title	Brood care in Brachyuran crabs: the effect of oxygen provision on reproductive costs
title_short	Brood care in Brachyuran crabs: the effect of oxygen provision on reproductive costs
title_full	Brood care in Brachyuran crabs: the effect of oxygen provision on reproductive costs
title_fullStr	Brood care in Brachyuran crabs: the effect of oxygen provision on reproductive costs
title_full_unstemmed	Brood care in Brachyuran crabs: the effect of oxygen provision on reproductive costs
title_sort	brood care in brachyuran crabs: the effect of oxygen provision on reproductive costs
publisher	Sociedad de Biología de Chile
publishDate	2003
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000200003
work_keys_str_mv	AT fernandezmiriam broodcareinbrachyurancrabstheeffectofoxygenprovisiononreproductivecosts AT branteantonio broodcareinbrachyurancrabstheeffectofoxygenprovisiononreproductivecosts
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Brood care in Brachyuran crabs: the effect of oxygen provision on reproductive costs

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