The importance of dietary calcium consumption in two species of semi-terrestrial grapsoid crabs

被引：6

作者：

Zanotto, Flavia P. ^{[1
]}

Pinheiro, Felipe ^{[2
]}

Sa, Marina G. e ^{[2
]}

机构：

[1] Univ Presbiteriana Mackenzie, Ctr Ciencias Biol & Saude, BR-01302907 Sao Paulo, Brazil

[2] Univ Sao Paulo, Inst Biociencias, Dept Fisiol, BR-05508900 Sao Paulo, Brazil

来源：

IHERINGIA SERIE ZOOLOGIA | 2009年 / 99卷 / 03期

基金：

巴西圣保罗研究基金会;

关键词：

Diet; semi-terrestrial crabs; feeding behavior; Sesarma rectum; Neohelice granulata; SHRIMP PENAEUS-MONODON; GECARCINUS-LATERALIS FREMINVILLE; JUVENILE GRASS SHRIMP; SALT-MARSH CRAB; GECARCOIDEA-NATALIS; HERMIT-CRAB; LAND CRAB; FEEDING-BEHAVIOR; REQUIREMENT; ACID;

D O I：

10.1590/S0073-47212009000300011

中图分类号：

Q95 [动物学];

学科分类号：

071002 ;

摘要：

Calcium (Ca) is essential for crustaceans, due to calcium carbonate (CaCO3) deposition in the new exoskeleton to harden it. The purpose of this work was to study short term Ca balance in terms of dietary Ca ingestion in two phylogenetically related crabs (Superfamily Grapsoidea) showing different degrees of terrestrial adaptations: Sesarma rectum Randall, 1840 and Neohelice granulata (Dana, 1851). Dietary Ca ingestion was studied using purified diets with different Ca concentrations (0, 2.2 and 6.66% Ca), together with measurements of Ca excretion and Ca hemolymph levels. The results showed that both crabs had the same response to foods containing different levels of Ca, with both species eating more of the high Ca diet. However, S. rectum consumed more per mg body mass at all Ca concentrations (6 mg.g(-1) for S. rectum against 3 mg.g(-1) for N. granulata). Both species excreted/egested Ca differently: S. rectum excreted Ca proportionally to ingestion, whereas N. granulata maintained constant faecal Ca output at all dietary Ca levels. Moreover, Ca hemolymph levels for crabs fed the different diets were independent of dietary Ca. In conclusion, both S. rectum and N. granulata seem to regulate the consumption of diets containing more Ca, which suggests a fine balance for Ca intake.

引用

页码：295 / 300

页数：6