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Related Concept Videos

Spermatogenesis01:41

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...
Spermatogenesis01:22

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Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
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Sperm Transport01:15

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The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
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Energy Budgets00:51

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Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...
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Phagocytosis

Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis (“cellular eating”) is one of three major types of endocytosis. Cells use phagocytosis to take in large objects—such as other cells (or their debris), bacteria, and even viruses.
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The objective of phagocytosis is often destruction. Cells use phagocytosis to eliminate unwelcome visitors, like pathogens (e.g., viruses and bacteria). Many immune system cells, including...

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Measuring Sperm Guidance and Motility within the Caenorhabditis elegans Hermaphrodite Reproductive Tract
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Spermatophore consumption in a cephalopod.

Benjamin J Wegener1, Devi Stuart-Fox, Mark D Norman

  • 1School of Biological Sciences, Monash University, Clayton, Victoria, Australia. benjamin.wegener@monash.edu

Biology Letters
|June 7, 2013
PubMed
Summary

Female Sepiadarium austrinum squid consume their partner's ejaculate, using the nutrients for self-care and egg production. This sperm consumption, coupled with short-term storage, influences male reproductive strategies.

Keywords:
ejaculate consumptionreproductionsexual conflictsexual selectionspermatophoresquid

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Area of Science:

  • Reproductive Biology
  • Animal Behavior
  • Marine Ecology

Background:

  • Gametes can serve as a nutrient source for mates.
  • Sperm and ejaculate consumption is documented in some species.
  • Cephalopods exhibit diverse reproductive strategies.

Purpose of the Study:

  • To investigate ejaculate and sperm consumption in the cephalopod Sepiadarium austrinum.
  • To determine the fate of nutrients from consumed spermatophores.
  • To understand the implications of sperm consumption on reproductive strategies.

Main Methods:

  • Male Sepiadarium austrinum spermatophores were labeled with Carbon-14 (14C).
  • Female squid were observed for spermatophore consumption.
  • Nutrient allocation was tracked through radiolabel analysis.
  • Sperm storage duration was assessed in relation to external fertilization.

Main Results:

  • Female Sepiadarium austrinum consumed spermatophores from their mates.
  • Consumed nutrients were utilized for somatic maintenance and egg production.
  • Sperm storage in the buccal cavity was short-term, lasting less than 21 days.
  • Evidence of ejaculate consumption was confirmed via radiolabel tracing.

Conclusions:

  • Female ejaculate consumption is a significant nutritional strategy in Sepiadarium austrinum.
  • Short-term external sperm storage influences reproductive dynamics.
  • This behavior exerts selective pressure on male reproductive traits and strategies.
  • Nutrient acquisition through mating impacts female fitness and reproductive output.