Relative growth and reproductive cycle of the date mussel Lithophaga lithophaga (Linnaeus, 1758) sampled from the Bizerte Bay (Northern Tunisia)

AbstractA study on the relative growth and reproductive cycle of the purple dye murex (Bolinus brandaris) was performed from March 2007 to February 2008 in two populations with contrasting imposex levels (Carthage Byrsa — CB in the small Gulf of Tunis and Menzel Abderrahmane — MA in the Bizerta Lagoon). Both populations presented balanced sex ratios. Comparison of allometric relationships established between linear and ponderal variables (sexes confounded) revealed higher growth in CB than in MA. Mature individuals were found throughout the year, except for September in MA. Spawning periods occurred from March–April to May and from June to August in both sites. Spawning was associated to an increase in seawater temperature. Besides increasing the current knowledge on the biology of B. brandaris from the southern Mediterranean, the information gathered in the present study constitutes a useful baseline for the sustainable management of local wild stocks, namely by prohibiting collection of snails during the spawning season.

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Does the direct effect of atmospheric CO2 concentration on leaf respiration vary with temperature? Responses in two species of Plantago that differ in relative growth rate

Physiologia Plantarum ◽

10.1034/j.1399-3054.2001.1140109.x ◽

2002 ◽

Vol 114 (1) ◽

pp. 57-64 ◽

Cited By ~ 37

Author(s):

Dan Bruhn ◽

Teis N. Mikkelsen ◽

Owen K. Atkin

Keyword(s):

Growth Rate ◽

Relative Growth Rate ◽

Direct Effect ◽

Co2 Concentration ◽

Atmospheric Co2 ◽

Leaf Respiration ◽

Relative Growth ◽

Atmospheric Co2 Concentration ◽

Temperature Responses

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Core body temperature is not a valid parameter to follow the reproductive cycle in female marmoset monkey (Callithrix jacchus)

Experimental and Clinical Endocrinology & Diabetes ◽

10.1055/s-0033-1359442 ◽

2013 ◽

Vol 121 (10) ◽

Author(s):

K Hoffmann ◽

J König ◽

K Eildermann ◽

E Fuchs ◽

R Behr ◽

...

Keyword(s):

Body Temperature ◽

Reproductive Cycle ◽

Core Body Temperature ◽

Callithrix Jacchus ◽

Marmoset Monkey ◽

Core Body

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Elevated nest predation risk promotes offspring size variation in birds with prolonged parental care.

10.32942/osf.io/h2mpw ◽

2019 ◽

Author(s):

Gretchen F. Wagner ◽

Emeline Mourocq ◽

Michael Griesser

Keyword(s):

Predation Risk ◽

Reproductive Cycle ◽

Perceived Risk ◽

Nest Predation ◽

Bird Species ◽

Size Variation ◽

Egg Laying ◽

Offspring Size ◽

Natural Predation ◽

Risk Spreading

Predation of offspring is the main cause of reproductive failure in many species, and the mere fear of offspring predation shapes reproductive strategies. Yet, natural predation risk is ubiquitously variable and can be unpredictable. Consequently, the perceived prospect of predation early in a reproductive cycle may not reflect the actual risk to ensuing offspring. An increased variance in investment across offspring has been linked to breeding in unpredictable environments in several taxa, but has so far been overlooked as a maternal response to temporal variation in predation risk. Here, we experimentally increased the perceived risk of nest predation prior to egg-laying in seven bird species. Species with prolonged parent-offspring associations increased their intra-brood variation in egg, and subsequently offspring, size. High risk to offspring early in a reproductive cycle can favour a risk-spreading strategy particularly in species with the greatest opportunity to even out offspring quality after fledging.

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Mechanisms underlying pituitary microvascular remodelling in thoroughbred horses during the annual reproductive cycle

Reproduction Abstracts ◽

10.1530/repabs.1.p342 ◽

2014 ◽

Author(s):

Angus Yeomans ◽

Nichol Thompson ◽

Jennifer Castle-Miller ◽

David O Bates ◽

Domingo Tortonese

Keyword(s):

Reproductive Cycle ◽

Annual Reproductive Cycle ◽

Thoroughbred Horses

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