气候变化领域集成服务门户(CCPortal): Growth increments of the recent brachiopod Magellania venosa mechanically marked in Paso Comau and Comau Fjord, Chile, 2011/2012

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.845997
	Growth increments of the recent brachiopod Magellania venosa mechanically marked in Paso Comau and Comau Fjord, Chile, 2011/2012
	Baumgarten; Sebastian; Laudien; Jürgen; Jantzen; Carin; Häussermann; Verena; Försterra; Günter
发布日期	2015-05-06
数据集类型	dataset
英文简介	Magellania venosa, the largest recent brachiopod, occurs in clusters and banks in population densities of up to 416 ind/m2 in Comau Fjord, Northern Chilean fjord region. Below 15 m, it co-occurs with the mytilid Aulacomya atra and it dominates the benthic community below 20 m. To determine the question of why M. venosa is a successful competitor, the in situ growth rate of the brachiopod was studied and its overall growth performance compared with that of other brachiopods and mussels. The growth in length was measured between February 2011 and March 2012 after mechanical tagging and calcein staining. Settlement and juvenile growth were determined from recruitment tiles installed in 2009 and from subsequent photocensus. Growth of M. venosa is best described by the general von Bertalanffy growth function, with a maximum shell length (Linf) of 71.53 mm and a Brody growth constant (K) of 0.336/year. The overall growth performance (OGP index = 5.1) is the highest recorded for a rynchonelliform brachiopod and in the range of that for Mytilus chilensis (4.8-5.27), but lower than that of A. atra (5.74). The maximal individual production (PInd) is 0.29 g AFDM/ind/year at 42 mm shell length and annual production ranges from 1.28 to 89.25 g AFDM/year/m2 (1-57% of that of A. atra in the respective fjords). The high shell growth rate of M. venosa, together with its high overall growth performance may explain the locally high population density of this brachiopod in Comau Fjord. However, the production per biomass of the population (P/B-ratio) is low (0.535) and M. venosa may play only a minor role in the food chain. Settling dynamics indicates that M. venosa is a pioneer species with low juvenile mortality. The coexistence of the brachiopod and bivalve suggests that brachiopod survival is affected by neither the presence of potential brachiopod predators nor that of space competitors (i.e. mytilids).
空间范围	Median Latitude: -42.331712 * Median Longitude: -72.466410 * South-bound Latitude: -42.409833 * West-bound Longitude: -72.598580 * North-bound Latitude: -42.162030 * East-bound Longitude: -72.415500
时间范围	2010-05-04T13:00:00 - 2010-09-15T03:50:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/215455
推荐引用方式 GB/T 7714	Baumgarten,Sebastian,Laudien,et al. Growth increments of the recent brachiopod Magellania venosa mechanically marked in Paso Comau and Comau Fjord, Chile, 2011/2012.2015-05-06.https://doi.org/10.1594/PANGAEA.845997.