scispace - formally typeset
Search or ask a question
JournalISSN: 0165-1269

International journal of invertebrate reproduction 

Taylor & Francis
About: International journal of invertebrate reproduction is an academic journal. The journal publishes majorly in the area(s): Vitellogenesis & Sperm. It has an ISSN identifier of 0165-1269. Over the lifetime, 210 publications have been published receiving 4064 citations.

Papers published on a yearly basis

Papers
More filters
Journal ArticleDOI
TL;DR: The structure of data in reproductive biology is detailed, and methods of analysing gonad indices and maturity indices are reviewed, and the value of periodic regression as a tool to aid the understanding of reproductive cycles deserves further investigation.
Abstract: As studies of invertebrate reproduction are expensive in time and money, there is a need to make the maximum use of the resultant data. It is also important to ensure that the conclusions of a study can be legitimately drawn from the data. Both of these factors necessitate the development of appropriate statistical methodology in reproductive biology. The structure of data in reproductive biology is detailed, and methods of analysing gonad indices and maturity indices are reviewed. Although gonad indices have been widely used, they are only really satisfactory in species with strong seasonality of reproduction. There is, however, considerable scope for extracting more information from gonad indices than is usually obtained. The value of periodic regression as a tool to aid the understanding of reproductive cycles deserves further investigation. If microscopic preparations of the gonads are being produced to estimate maturity indices, it is definitely worthwhile measuring oocyte sizes in the females, as th...

116 citations

Journal ArticleDOI
TL;DR: It is reasoned that the delay response is elicited by an inhibitory factor released continually from Diplosoma, which is reversible, non-pathological, and species specific.
Abstract: In nature, the marine bryozoan, Bugula pacifica, is consistently the ‘loser’ when competing for space with the compound ascidian, Diplosoma macdonaldi. We provide laboratory evidence to show that Bugula larvae will delay settling in either ‘Diplosoma-conditioned water’ or an alcohol Diplosoma extract. It is reasoned that the delay response is elicited by an inhibitory factor released continually from Diplosoma. This response is reversible, non-pathological, and species specific. The possible ecological significance of larval avoidance behavior in this and other communities is discussed.

102 citations

Journal ArticleDOI
TL;DR: Elevated O2-content of the water, a clear jar and clean water all have a positive effect on egg-laying, and the size of the egg capsule depends on the number of ripe eggs in the ovotestis and the packaging capacity of the female accessory sex organs.
Abstract: Ovipository activity decreases when specimens of the pond snail, Lymnaea stagnalis, are kept in closed jars that are not cleaned regularly. When the snails are transferred from dirty to clean water, egg-laying occurs within 3 h in over 90% of the animals. The number of eggs per egg mass laid after water change is directly related to the length of the period between the induced and the previous oviposition. The relationship is similar to that found when snails are injected with a very high dose (20-times threshold) of egg-laying hormone. The latency of oviposition, which depends on the dose of ovulation hormone, is not affected by the oviposition interval. The size of the egg capsule depends on the number of ripe eggs in the ovotestis and the packaging capacity of the female accessory sex organs. The role of a number of component factors of the water-change stimulus was studied. Elevated O2-content of the water, a clear jar and clean water all have a positive effect on egg-laying. Clean water is the most e...

100 citations

Journal ArticleDOI
TL;DR: Neither fecundity nor the number of deposited eggs are a function of ejaculate weight, Consequently, ejaculate materials cannot be designated a form of paternal investment, despite the observed transfer to unfertilized eggs.
Abstract: In Plodia interpunctella, radioactive labelling techniques indicate that male-derived substances, transferred to the female during copulation, enter unfertilized eggs. These substances are proteinaceous and the cumulative amount of material entering the unfertilized eggs increases with time since mating. Following courtship, smaller males complete coupling with females at a lower frequency than larger males. Smaller males also transfer smaller (by weight) ejaculates than larger males. Ejaculate weight is about 4% of male body weight in P. interpunctella. However, neither fecundity nor the number of deposited eggs are a function of ejaculate weight. Consequently, ejaculate materials cannot be designated a form of paternal investment, despite the observed transfer to unfertilized eggs.

86 citations

Journal ArticleDOI
TL;DR: Data from north Atlantic copepods indicate that it is suggested that the slow rates of embryonic development in many Antarctic marine invertebrates are the result of large egg size, and not the low temperature.
Abstract: The life-history tactics of many Antarctic marine invertebrates suggest that the commonly observed slow rates of growth are adaptations to the pattern of food availability, and not due to low temperature per se. This implies that marine invertebrates have been able, over the course of evolutionary time, to compensate their rates of embryonic development for the effect of temperature. Data from north Atlantic copepods indicate that this is so. It is therefore suggested that the slow rates of embryonic development in many Antarctic marine invertebrates are the result of large egg size, and not the low temperature. Large, slowly developing eggs are part of a suite of tactics, often called K-strategies, which characterise many marine invertebrates in Antarctica.

84 citations

Network Information
Related Journals (5)
Journal of Insect Physiology
9.1K papers, 323.4K citations
72% related
Journal of Experimental Zoology
11.5K papers, 360.4K citations
71% related
General and Comparative Endocrinology
11.9K papers, 391K citations
71% related
Journal of Experimental Marine Biology and Ecology
9.6K papers, 453.2K citations
70% related
Canadian Journal of Zoology
14.8K papers, 460.6K citations
70% related
Performance
Metrics
No. of papers from the Journal in previous years
YearPapers
198333
198239
198164
198034
197940